When I drove Robs car we called Qship to compare rpms, they turned out to be the same @ 80mph in OD, and @50 in 3rd. His car screams from anything past idle, from a 70 mph roll it downshifts to 2nd and is just a smooth rush of power, but the best part is when it grabs 3rd and just continues to accelerate, this is the fastest Q I have had the pleasure of driving, the car pulls so good that a few times I found myself really wondering if the gear was actually installed, the headers and exhaust make the car rev very quick , if you get rolling in 1st gear and then puch it you will immediatley get a big smile on your face like I did, The car is a joy to drive and Rob did a great job with all of the mods, by the way, the Level 10 transmission is AWESOME, driving his Q has givin me motivation to get working on mine again. By the way I asked Rob to put off the dyno testing becuase the weather will be a ton worst than it was when he baselined, it is currently 90 deg in the morning with 90% humidity, the weather is just nasty for HP but we will see, I think 30-35 hps picked up
Headers, O2 sensors, JWT ECU, & air/fuel ratio question
Thanks MINI, im just pissed my vaca is over, South Florida is great, so much excessive spending, so many fake boobs, so many Mercedes and 745s, and G35 coupes, that it just makes you wanna never want to leave, I have never seen so many Bentleys on the road in my whole life, I cant waite to go back, Rob owes me a boat ride:D
1qckser....thanks for the great write up of my car and it is great to put a face with a name as well. I will do they dyno again this fall when it cools down also. It was great to see my car from a by-standers position and especially have another Q owner tell me what he thought of it as I have never had another Q owner drive my car. No problem on boat ride I owe as the boat is always so much fun.....wait till you see all the mega yachts and cigar boats if you think the cars down here were expensive.
Yes it is "hot" down here now and I like it becuase when it gets this damn hot the girls just don't where anything at all...even to a professional office enironment....the most sexy tight fitting pants that almost leave nothing to the imagination. I should have been plastic surgeon...I would still be living in Miami, but I would be ever so slightly enhancing beautiful girls all day long vs. typing away on the key board with some crazy insurance statistical forecast models.....and ohh yes...maybe driving one of those Ferrari's that I see down here on a daily basis. I saw two weeks ago an "Enzo" Ferrari....the one that costs about $750,000. I about $hit my pants when I saw it....also there must have been a fire sale on the new Lambo's as I have seen 3 different totally brand new Lambo's (new styling) in the last week as I see at least 1 Lambo a week...but 3 brands new ones is a bit much.
Corey....thanks for the offer on the camera and I might take you up on it. I need to buy a memory stick for the digital video camera and take a few pics to see how they come out as it is less than 1 mega pixel on the video camera for still shots. If the quality is no good then we will have to work something out.
Dennis....sorry to hear about the emissions testing for you guys up there. I know my car is not good for the environment as it is setup right now, but I do recycle in my condo for which nobody else ever does down here in a Miami condo as it is mostly foriegners in my condo and they never recycle. The two (car vs. recycling) don't probably balance out though.
Yes it is "hot" down here now and I like it becuase when it gets this damn hot the girls just don't where anything at all...even to a professional office enironment....the most sexy tight fitting pants that almost leave nothing to the imagination. I should have been plastic surgeon...I would still be living in Miami, but I would be ever so slightly enhancing beautiful girls all day long vs. typing away on the key board with some crazy insurance statistical forecast models.....and ohh yes...maybe driving one of those Ferrari's that I see down here on a daily basis. I saw two weeks ago an "Enzo" Ferrari....the one that costs about $750,000. I about $hit my pants when I saw it....also there must have been a fire sale on the new Lambo's as I have seen 3 different totally brand new Lambo's (new styling) in the last week as I see at least 1 Lambo a week...but 3 brands new ones is a bit much.
Corey....thanks for the offer on the camera and I might take you up on it. I need to buy a memory stick for the digital video camera and take a few pics to see how they come out as it is less than 1 mega pixel on the video camera for still shots. If the quality is no good then we will have to work something out.
Dennis....sorry to hear about the emissions testing for you guys up there. I know my car is not good for the environment as it is setup right now, but I do recycle in my condo for which nobody else ever does down here in a Miami condo as it is mostly foriegners in my condo and they never recycle. The two (car vs. recycling) don't probably balance out though.
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
It would be nice to have a backpressure reading [another bung] near the oxygen sensors on each header say at 4,000 rpm and 6,000 and all the way up to redline. Jury rig a metal length under car to rubber cooling hose to isolate heat with gauge coming in the window.
Use the 1 psi = 2 HP rule..............others equate this to 8-10% power loss per 14.7 psi depending on exhaust temperature so 1 psi restriction might be as low as 1.6 HP [based on 300HP].
Somewhere between 1.6 and 2.0 HP per psi at 1st O2 sensor
My guess is 3-4 psi NOW vs probably 13 psi stock......10 psi=16-20HP improvement...........all the residual gases allowed out.............the loss of cats [backpressure] was probably 40% the gain...........as the best cat back exhaust deliver 7-9 HP.
The farther the restriction is from exhaust valve the less it affects the pulse pressure.
We had a Tallahasssee 94Q with melted [rattley] precats [which were subsequently gutted by "parties unknown"] that was significantly stronger feeling.
The Q engine is less sensitive to back pressure [and some reversion] because the overlap is so low thanks to VVT shifting from 28>8 at high rpms.....unlike 2 valve engines without VVT which use 28-48 degrees of overlap."What started as an undetected fuel leak [injector] caused the catalytic converter to eventually overheat and begin to melt down (it was now a partial exhaust restriction). This caused an increase in exhaust backpressure. The increased backpressure caused the EGR valve pintle to open further than commanded when accelerating or at a steady cruise speed. The excessive EGR flow caused the engine surge."
With your low back pressure you may not have enough EGR at cruise so NOX will go out of sight..........make sure your O2 are new and fresh.
Problem could be solved by some type of rpm based added restriction.
Use the 1 psi = 2 HP rule..............others equate this to 8-10% power loss per 14.7 psi depending on exhaust temperature so 1 psi restriction might be as low as 1.6 HP [based on 300HP].
Somewhere between 1.6 and 2.0 HP per psi at 1st O2 sensor
My guess is 3-4 psi NOW vs probably 13 psi stock......10 psi=16-20HP improvement...........all the residual gases allowed out.............the loss of cats [backpressure] was probably 40% the gain...........as the best cat back exhaust deliver 7-9 HP.
The farther the restriction is from exhaust valve the less it affects the pulse pressure.
We had a Tallahasssee 94Q with melted [rattley] precats [which were subsequently gutted by "parties unknown"] that was significantly stronger feeling.
The Q engine is less sensitive to back pressure [and some reversion] because the overlap is so low thanks to VVT shifting from 28>8 at high rpms.....unlike 2 valve engines without VVT which use 28-48 degrees of overlap."What started as an undetected fuel leak [injector] caused the catalytic converter to eventually overheat and begin to melt down (it was now a partial exhaust restriction). This caused an increase in exhaust backpressure. The increased backpressure caused the EGR valve pintle to open further than commanded when accelerating or at a steady cruise speed. The excessive EGR flow caused the engine surge."
With your low back pressure you may not have enough EGR at cruise so NOX will go out of sight..........make sure your O2 are new and fresh.
Problem could be solved by some type of rpm based added restriction.
Wes...the high pitched whinnig sound is actually from the damn differential that is suppose to be a 4.08. The damn thing whines like a little biieetch!!! and is really bad cruising at 40mph vs. 80mph. I am trying to get to the bottom of things to figure out why the damn thing whines so much but this is definitely not easy finding somebody with differential experience to adjust it properly.
If anybody knows why the diff whines, please let me know. I contacted the builder (Kevin) and he said a little whine was normal, but this thing sounds like a damn jet engine at 40mph and I will not take another differential from him until he/I figures out why it is whinning so much. I am going to send him a sound clip of the whine this weekend so he can hear for himself and that I am not just being a picky person.
We have no restrictions here in Miami on emissions...did away with them about 5+ years ago and if they do bring them back...well Miami has its pluses and minuses and I am sure that somebody can be bought very easily here in Miami...if not I will just register the car at my parents house in Northwest Florida (Destin).
Dennis....when I get my butt up there to have some work done on the car you can have the car for a day and do all the tests you would like on the car. I would do these tests, but I don't know anybody down here with a garage or lift where I could do this stuff. If I was in my home town (NW Florida)...my best friend from highschool owns his own auto repair business garage and we use to have good times playing around with our cars on the lifts trying this and that redneck mod to see how things worked or did not work after our redneck modificiations.
If anybody knows why the diff whines, please let me know. I contacted the builder (Kevin) and he said a little whine was normal, but this thing sounds like a damn jet engine at 40mph and I will not take another differential from him until he/I figures out why it is whinning so much. I am going to send him a sound clip of the whine this weekend so he can hear for himself and that I am not just being a picky person.
We have no restrictions here in Miami on emissions...did away with them about 5+ years ago and if they do bring them back...well Miami has its pluses and minuses and I am sure that somebody can be bought very easily here in Miami...if not I will just register the car at my parents house in Northwest Florida (Destin).
Dennis....when I get my butt up there to have some work done on the car you can have the car for a day and do all the tests you would like on the car. I would do these tests, but I don't know anybody down here with a garage or lift where I could do this stuff. If I was in my home town (NW Florida)...my best friend from highschool owns his own auto repair business garage and we use to have good times playing around with our cars on the lifts trying this and that redneck mod to see how things worked or did not work after our redneck modificiations.
Also to do any type of work on my car is a real pain in the a$$ as I live in a condo on Miami Beach and the amount of attention that you get from just changing a tire in the parking garage is unbelievable...questions and questions and then everybody loves to just watch what you are doing...like they have never seen anybody work on a car that lives in a condo before. The best question of them all is "why don't you take it to a shop and have them do it or call AAA to have them do it?" I really hate answering that question.....as I like to work on my car and save monies even though I have not the slightest clue on what the hell I am doing half the time.
I need to give credit to Ash in Australia for doing this mod first as if it were not for him doing the mod then I would have not tried this myself.
I need to give credit to Ash in Australia for doing this mod first as if it were not for him doing the mod then I would have not tried this myself.
Okay guys...well the numbers don't lie and something screwy is going on with my car as I don't have the OEM gear...but I don't have a 4.08 either...at least I don't think so and my speedo is off.
Here are my 1/4 Runs tonight...I did them with our NICO member FastLane which was a blast to run against another Q45 as FastLane is a great guy.
Run.....#1-Drive....#2-Man Shift....#3-Man Shift...#4-Man ShiftR/T.......0.797..........0.892...............0.309..............0.21060'.......2.295..........2.303...............2.322..............2.277330'.....6.354..........6.350...............6.444..............6.2781/8......9.617..........9.594...............9.767.............9.521MPH.....76.09........76.43.................74.36..............76.211000'..12.436......12.387..............12.612...........12.3301/4.....14.814......14.757...............15.012............14.709MPH....93.55.......93.56..................93.34.............93.37
Just for comparison...here are some other 1/4 times from me and other NICO members.
Greg's (AzHitman's Car with 4.08) ET'sR/T: .17460': 2.541/8: 10.2681/4: 15.123MPH: 94.48
Oxs1 ET's (1 month ago)........Oxs1 ET's (Oct. 2003)R/T: .651.................................0.83360 FT: 2.580...........................2.467MPH: 72.93............................73.64ET: 10.266.............................10.058
My Runs - 1st Run (Stock 2 Months Ago)60' = 2.4330' = 6.81/8 = 10.3 @ 71.3mph1000' = 13.31/4 = 15.7 @ 88.0mph
My Runs - 2nd Run (Stock 2 Months Ago)60' = 2.4330' = 6.91/8 = 10.3 @ 71.0mph1000' = 13.31/4 = 15.8 @ 88.2mph
Okay...based on the numbers above...can somebody tell me WTF happened or is going on with my car and its numbers? I thought that I was in the mid 14's for certain...but I am not. My ET's are okay, but why is my MPH only 93mph??? Don't ask about the 15.0 ET run...I about died when they gave me the slip after all these mods. I tried manually shifting holding the gear until my tach says 7,300.
Here are my 1/4 Runs tonight...I did them with our NICO member FastLane which was a blast to run against another Q45 as FastLane is a great guy.
Run.....#1-Drive....#2-Man Shift....#3-Man Shift...#4-Man ShiftR/T.......0.797..........0.892...............0.309..............0.21060'.......2.295..........2.303...............2.322..............2.277330'.....6.354..........6.350...............6.444..............6.2781/8......9.617..........9.594...............9.767.............9.521MPH.....76.09........76.43.................74.36..............76.211000'..12.436......12.387..............12.612...........12.3301/4.....14.814......14.757...............15.012............14.709MPH....93.55.......93.56..................93.34.............93.37
Just for comparison...here are some other 1/4 times from me and other NICO members.
Greg's (AzHitman's Car with 4.08) ET'sR/T: .17460': 2.541/8: 10.2681/4: 15.123MPH: 94.48
Oxs1 ET's (1 month ago)........Oxs1 ET's (Oct. 2003)R/T: .651.................................0.83360 FT: 2.580...........................2.467MPH: 72.93............................73.64ET: 10.266.............................10.058
My Runs - 1st Run (Stock 2 Months Ago)60' = 2.4330' = 6.81/8 = 10.3 @ 71.3mph1000' = 13.31/4 = 15.7 @ 88.0mph
My Runs - 2nd Run (Stock 2 Months Ago)60' = 2.4330' = 6.91/8 = 10.3 @ 71.0mph1000' = 13.31/4 = 15.8 @ 88.2mph
Okay...based on the numbers above...can somebody tell me WTF happened or is going on with my car and its numbers? I thought that I was in the mid 14's for certain...but I am not. My ET's are okay, but why is my MPH only 93mph??? Don't ask about the 15.0 ET run...I about died when they gave me the slip after all these mods. I tried manually shifting holding the gear until my tach says 7,300.
Now for the gearing....I got on the phone with FastLane and we were side by side on the interstate asking eachother what rpm/mph we were at.....my speedo was about 4-5mph faster than his speedo. FastLane is running 225/60/15 @ 25.6"and I am running 215/65/15 tires @ 26.1" vs. my 26.1" now...will the 25.6" tire make the speedo higher or lower than actual. I am thinking it will make the speedo run higher, but I am not certain...based on info from http://www.gounitrax.com gearing formulas. My rpms were also higher than this...when he was at 3,000 I was at 3,250 rpms.
here are my rpms and mph in 3rd gear...but keep in mind my mph is off
80 @ 3,70085 @ 3,90090 @ 4,20095 @ 4,400100 @ 4,700
Greg...since you have the 4.08 and did not change your speedo...can you look at see what your 1-2 & 203 shift points are and also the above numbers in 3rd gear? Our cars should run the same RPM/speedo readings since I did not switch out the speedo gear.
If anybody else has any answers on his problem...that would be great.
Also...is it really possible to loose this much low-end torque/HP with adding the headers/exhuast system that is totally free flowing that would not make my tires spin like everyone else's tires with the 4.08. I can only still get a one solid revolution wheel spin depending on pavement conditions.
here are my rpms and mph in 3rd gear...but keep in mind my mph is off
80 @ 3,70085 @ 3,90090 @ 4,20095 @ 4,400100 @ 4,700
Greg...since you have the 4.08 and did not change your speedo...can you look at see what your 1-2 & 203 shift points are and also the above numbers in 3rd gear? Our cars should run the same RPM/speedo readings since I did not switch out the speedo gear.
If anybody else has any answers on his problem...that would be great.
Also...is it really possible to loose this much low-end torque/HP with adding the headers/exhuast system that is totally free flowing that would not make my tires spin like everyone else's tires with the 4.08. I can only still get a one solid revolution wheel spin depending on pavement conditions.
At least you're in the 14s... but definetely should have a higher trap.. and slighty lower ETs
Something is definetely up..
Further fine tuning required?
I''ll be happy when I get a copy of the mag my ride was featured in, mainly I want to see the accel times..
92 with JWT/Exhaust and 4.08.. we'll see what the mag got, compared to what you're at now
Something is definetely up..
Further fine tuning required?
I''ll be happy when I get a copy of the mag my ride was featured in, mainly I want to see the accel times..
92 with JWT/Exhaust and 4.08.. we'll see what the mag got, compared to what you're at now
Well at least in the 14's does not cut it for me...especially the upper 14's. If it turns out that I do have the 4.08...I will flip my lid as spending the monie I have to only get a 14.7 sec 1/4 really sucks and I will never be able to break my goal of a less than 14 sec ET.....FastLane said my car felt a lot quicker when he drove it...but maybe it is our mind over matter on seeing the speedo rise so quickly along with the nice sounding exhaust that may have led us to believe that my car was really faster than it is.
Quote from Dennis a while back.....
With standard diameter tires inflated correctly:4th: 333 rpms per 10 mph= 2,000@60 mph * lock up on3rd: 480 rpms per 10 mph= 2,879@60 mph * lock up on
obviously different tires with different tread depth can vary these numbers by 4% as the real rolling size can vary by up to 1.5"
Work backwards from tire loaded rolling circumference [26" less sidewall compression [0.8"?]=~~ 78.5" or 790-810 revs per mile
End Quote..................................
Okay with those numbers above...it looks like I do have the 3.538 gears as by 100mph speedo in 3rd gear reads 4,700 vs. 4,800 as it should according to the above...so now maybe I do have stock gear as I know that 80mph in 4th was at 2,600 as Todd (1qsker) verified this for me....Ugghh!!!!! What a royal pain in the a$$ this damn mod was and currently is.
With standard diameter tires inflated correctly:4th: 333 rpms per 10 mph= 2,000@60 mph * lock up on3rd: 480 rpms per 10 mph= 2,879@60 mph * lock up on
obviously different tires with different tread depth can vary these numbers by 4% as the real rolling size can vary by up to 1.5"
Work backwards from tire loaded rolling circumference [26" less sidewall compression [0.8"?]=~~ 78.5" or 790-810 revs per mile
End Quote..................................
Okay with those numbers above...it looks like I do have the 3.538 gears as by 100mph speedo in 3rd gear reads 4,700 vs. 4,800 as it should according to the above...so now maybe I do have stock gear as I know that 80mph in 4th was at 2,600 as Todd (1qsker) verified this for me....Ugghh!!!!! What a royal pain in the a$$ this damn mod was and currently is.
I'm with maxnix. Those are very substantial gains Rob. You've practically lost a second in your 1/4 mile. With the 4.08 the car will feel even faster, though the quarter mile undoubtedly won't gain much from it. Even if you can't get the car into the 13 second range you'll have the best setup possible for a supercharger.
The ACPT drive shaft would help increase those times more I'm sure. By how much... well it may get you into the low 14s. I'm not too sure what else you could do to cut down your ETs other than scratch some weight and by a set of tiny rims with wide rubber on them...
Corey
The ACPT drive shaft would help increase those times more I'm sure. By how much... well it may get you into the low 14s. I'm not too sure what else you could do to cut down your ETs other than scratch some weight and by a set of tiny rims with wide rubber on them...
Corey
-
Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Thought somethings was funky with the video. Some kind of time compression in the codec yours or mine {?}. Oh well. Still great numbers for a 94Q for the temperature. WHAT WAS IT EXACTLY?
You've gained 40-45+ flywheel HP comparing the two runs. Plus reduced the 1st>2nd shift time by what looks like HALF [0.4 secs].......whether the power comes back after the shift at the same rate is unknown? The combo makes it look like you gained 100 HP from ET alone but trap speed shows the real HP gain 88 vs 93 mph.
Heres what you do: With a Consult set up the data log to read rpm both sources, MAF, injector time right and left, and advance, coolant temp, O2 voltages both.......record outside temp from HVAC but AC OFF.
Do some WOT runs but only hit the data recorder start at 3500-4,000 in 1st gear............only 3.5 seconds of data storage [takes some practice.
2nd gear will be more problematic as you will be in it for 9 seconds.Have to break the data down is 4000-5200, 5000-6000, 5900-7000 segements
MAF vs rpm vs injector time vs advance vs air temp [plus fuel pressure] lets me calculate everything.
Hopefully in heat you were running oem air box and filter?
You've gained 40-45+ flywheel HP comparing the two runs. Plus reduced the 1st>2nd shift time by what looks like HALF [0.4 secs].......whether the power comes back after the shift at the same rate is unknown? The combo makes it look like you gained 100 HP from ET alone but trap speed shows the real HP gain 88 vs 93 mph.
Heres what you do: With a Consult set up the data log to read rpm both sources, MAF, injector time right and left, and advance, coolant temp, O2 voltages both.......record outside temp from HVAC but AC OFF.
Do some WOT runs but only hit the data recorder start at 3500-4,000 in 1st gear............only 3.5 seconds of data storage [takes some practice.
2nd gear will be more problematic as you will be in it for 9 seconds.Have to break the data down is 4000-5200, 5000-6000, 5900-7000 segements
MAF vs rpm vs injector time vs advance vs air temp [plus fuel pressure] lets me calculate everything.
Hopefully in heat you were running oem air box and filter?
Thanks guys for the encouragement on the ET's....but I was hoping for much faster after the addition of the headers. So right now, I am somewhat disappointed to say the least as I really wanted mid 14's and a much higher trap. As Dennis says...there must be some type of video record/playback compression going on as the numbers were just too good to be true.
The track we ran at is in WestPalm Beach, FL.....Moroso Motorspeedway.
I definitely think I have a stock diff 3.538 ratio as well right now based on the quote I posted from Dennis I found in an earlier post on my rpms vs speed...either way it is being pulled asap as the damn thing soundsl like it is ready to explode....especially after my last run. I was real happy to have FastLane with me on the interstate on the 70+mile hike back down to Miami last night incase it did blow up.
I know others at the track were very impressed....spanked a couple early 90's camero's/mustangs that were in low 15's and a Civic that ran 16.0 flat.....but I need low 14's.
When I was manually shifting holding gear until 7,300 rpms each time I am almost positive I was still shifting at 90mph and therefore creating more time on the clock with the 2-3 shift.
When FastLane drove my car....he noticed something that I totally missed and I don't remember if 1qsker noticed it as well. I have lost the rush/surge in power that we get from 3,500 to just over 4,000 when accelerating and you can feel the car put you in your seat....the acceleration rate now is very smooth and consistent unlike before when you hit 3,500 rpms and could just feel the rush.
I ran the K&N box filter with stock box intake.
Can somebody tell me why my ET's would be so quick, but my mph would only be 5mph better? I am just curious if it is torque that moves me quicker (less ET's) and it is HP that gets me faster trap speeds (MPH).
I had a new Maxima race me on the way home...we went at it from 90mph.....I pulled on him slightly (1 car length) till 130mph and then let off and he still wanted more, but I wastired and let him move on.
Ohhh...by the way if my speedo is really right this means I hit 160mph last night after the track as when eveyone was leaving the track I had the most old crappy looking Escort try to race FastLane first and then he caught up to me and we went at it from 90mph...the damn thing pulled on me until 120mph and then I evened things up with him at 134-140 (nose to nose) and I was like "I got the top end baby see ya"....well I kept it floored all the way to try to ge tthe best of him and he just kept right there side by side until I barried it into 160mph. After 150mph I started to feel a little shimmy, but nothing major and was probably from going over the tires speed rating. I could not believe this damn thing and I never got a chance to ask him what the hell he had under the hood as it was not loud or anything like that...he did have those 2 little front pillar gages, but I have no idea if that means NOS or turbo or whatever. Damn...I can't believe that I went 160mph, but the car felt good...need to get better tires and at 160mph I remember the car not close to redline :-) still had room to go!!! The only reason I barried it to 160mph is that I thought my speedo was off and that the faster I went the more the speedo was off so I was thinking that at 150mph I was around 130 or so.....shhiieettt....I guess I was wrong there and I don't think that I would have ever gone to 160mph truely knowing that my speedo was accurate. I do have my chicken-shiet limits.
The track we ran at is in WestPalm Beach, FL.....Moroso Motorspeedway.
I definitely think I have a stock diff 3.538 ratio as well right now based on the quote I posted from Dennis I found in an earlier post on my rpms vs speed...either way it is being pulled asap as the damn thing soundsl like it is ready to explode....especially after my last run. I was real happy to have FastLane with me on the interstate on the 70+mile hike back down to Miami last night incase it did blow up.
I know others at the track were very impressed....spanked a couple early 90's camero's/mustangs that were in low 15's and a Civic that ran 16.0 flat.....but I need low 14's.
When I was manually shifting holding gear until 7,300 rpms each time I am almost positive I was still shifting at 90mph and therefore creating more time on the clock with the 2-3 shift.
When FastLane drove my car....he noticed something that I totally missed and I don't remember if 1qsker noticed it as well. I have lost the rush/surge in power that we get from 3,500 to just over 4,000 when accelerating and you can feel the car put you in your seat....the acceleration rate now is very smooth and consistent unlike before when you hit 3,500 rpms and could just feel the rush.
I ran the K&N box filter with stock box intake.
Can somebody tell me why my ET's would be so quick, but my mph would only be 5mph better? I am just curious if it is torque that moves me quicker (less ET's) and it is HP that gets me faster trap speeds (MPH).
I had a new Maxima race me on the way home...we went at it from 90mph.....I pulled on him slightly (1 car length) till 130mph and then let off and he still wanted more, but I wastired and let him move on.
Ohhh...by the way if my speedo is really right this means I hit 160mph last night after the track as when eveyone was leaving the track I had the most old crappy looking Escort try to race FastLane first and then he caught up to me and we went at it from 90mph...the damn thing pulled on me until 120mph and then I evened things up with him at 134-140 (nose to nose) and I was like "I got the top end baby see ya"....well I kept it floored all the way to try to ge tthe best of him and he just kept right there side by side until I barried it into 160mph. After 150mph I started to feel a little shimmy, but nothing major and was probably from going over the tires speed rating. I could not believe this damn thing and I never got a chance to ask him what the hell he had under the hood as it was not loud or anything like that...he did have those 2 little front pillar gages, but I have no idea if that means NOS or turbo or whatever. Damn...I can't believe that I went 160mph, but the car felt good...need to get better tires and at 160mph I remember the car not close to redline :-) still had room to go!!! The only reason I barried it to 160mph is that I thought my speedo was off and that the faster I went the more the speedo was off so I was thinking that at 150mph I was around 130 or so.....shhiieettt....I guess I was wrong there and I don't think that I would have ever gone to 160mph truely knowing that my speedo was accurate. I do have my chicken-shiet limits.
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HeavyDuty
- Posts: 1281
- Joined: Tue Sep 23, 2003 4:51 pm
- Car: 1995 Infiniti Q45
95 Nissan 240SX S14
96 Nissan D21
06 Nissan 350Z Z33
Temps at Moroso during summer are high enough for me to swear not to ever go back to a June-Aug show or race.
The noise you're hearing is from a combination of incorrect pinion depth and lack of appropriate backlash. Or, you could have some damage to the pinion bearing being reused or if a new one were installed incorrectly.
The pinion depth refers to placement of the pinion fore and aft in the housing (front of the car to back of the car). The ring gear backlash is relative to left to right placement of the ring gear (driver's side to passenger side).
It takes hours & hours of assembly, measure, disassembly, adjustment, reassembly, repeat, to get it right. Don't feel like the Lone Stranger, I know it's frustrating, but it takes a special person or a shop with very precise tools & the desire to set it up perfectly to get it right.
When the diff exploded in my Lightning, I took it back three times before they installed a complete new assembly. I know exactly what you mean about the noise, it sounds like a 747 is about to land in the trunk.
You dropped a second and gained 5mph trap speed! Considering what I know the conditions to be right now, I too would have hoped for more, but would be pleased nonetheless knowing I still had my gear to still install. The gear *should* drop your et slightly but your mph might not increase much. Your 2.2 60' is real good! After looking at the videos, the standing start initial rpm climb to 2400 rpm looks stock to me.
In my experience, when adding headers you might lose a little down low for an increase up top.
What size primaries are those anyway? (The diameter of the header pipes at the head.) Hopefully not larger than 1 5/8, hard to tell from the pictures.
Oh yeah, one more thing. If I may suggest, trust the force, Luke, when it comes to shift points. If it stops or slows accelerating, shift then, don't arbitrarily take it to 7300. Next time I would try 7200, 7100, 7000, etc & see if your times don't drop until they start going back up again. Then you will have found the sweet spot.
Even with the JWT ECU, my car stops pulling long before 7300. With your larger exhaust, it should pull up higher, but maybe not quite to 7300.
The noise you're hearing is from a combination of incorrect pinion depth and lack of appropriate backlash. Or, you could have some damage to the pinion bearing being reused or if a new one were installed incorrectly.
The pinion depth refers to placement of the pinion fore and aft in the housing (front of the car to back of the car). The ring gear backlash is relative to left to right placement of the ring gear (driver's side to passenger side).
It takes hours & hours of assembly, measure, disassembly, adjustment, reassembly, repeat, to get it right. Don't feel like the Lone Stranger, I know it's frustrating, but it takes a special person or a shop with very precise tools & the desire to set it up perfectly to get it right.
When the diff exploded in my Lightning, I took it back three times before they installed a complete new assembly. I know exactly what you mean about the noise, it sounds like a 747 is about to land in the trunk.
You dropped a second and gained 5mph trap speed! Considering what I know the conditions to be right now, I too would have hoped for more, but would be pleased nonetheless knowing I still had my gear to still install. The gear *should* drop your et slightly but your mph might not increase much. Your 2.2 60' is real good! After looking at the videos, the standing start initial rpm climb to 2400 rpm looks stock to me.
In my experience, when adding headers you might lose a little down low for an increase up top.
What size primaries are those anyway? (The diameter of the header pipes at the head.) Hopefully not larger than 1 5/8, hard to tell from the pictures.
Oh yeah, one more thing. If I may suggest, trust the force, Luke, when it comes to shift points. If it stops or slows accelerating, shift then, don't arbitrarily take it to 7300. Next time I would try 7200, 7100, 7000, etc & see if your times don't drop until they start going back up again. Then you will have found the sweet spot.
Even with the JWT ECU, my car stops pulling long before 7300. With your larger exhaust, it should pull up higher, but maybe not quite to 7300.
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
The dyno graph [a Mustang] will show where the problems are as we can compare the slope [rate of torque fall off from torque peak rpms to redline.
With JWT [7300 rev limit] why did you shift you should have set it in 2nd gear and held on hitting the rev limiter at a real 97-98.6 mph just at the end +- 10 feet from the lights........assuming tires are 26".
With JWT [7300 rev limit] why did you shift you should have set it in 2nd gear and held on hitting the rev limiter at a real 97-98.6 mph just at the end +- 10 feet from the lights........assuming tires are 26".
Something is definetely up Rob, and I think you are right to be harsh on the cars performance.
We all agreed the previous 1/4 run with the 88 trap was not up to stock performance, and something was causing the low traps...
I know you won't settle, and I don't blame you...
It seems most of your reduction in ET is coming from your level ten/TC... Something is holding back your traps, you should be at least at 95.....
I would imagine my stock 94 would put down 93 or so in the 1/4, but definetely not anywhere close to 14.7
We all agreed the previous 1/4 run with the 88 trap was not up to stock performance, and something was causing the low traps...
I know you won't settle, and I don't blame you...
It seems most of your reduction in ET is coming from your level ten/TC... Something is holding back your traps, you should be at least at 95.....
I would imagine my stock 94 would put down 93 or so in the 1/4, but definetely not anywhere close to 14.7