I wanted to share my experience with BG44K, this has been on going and I didnt want to say anything until I had full evidence.
WHen it was really cold, I had been experiencing about 10ish mpg. This is unacceptable in my book......
I used BG44k once before, and it didnt really do anything.... However, I recently used it about 1.5mos ago, except this time i used it on a long road trip. 200 miles in 2 days, 100 miles each time, cruising at 80ish most of the time.....
For that 220 miles, i went through about 1/2 tank, so i was getting 21.7 or so MPG, which was really good I though considering the WOTs i did while cruising.....
What I was REALLY surprised about is that it boosted my in town mileage to 15+mpg.. NO changes in driving styles, and if anything I drove it HARDER after!!!
Here were my 3 tanks prior to treatment12ish (cant remember exact numbers)11.710.2<----- all time low I EVER saw on my Q45
Then I did my road trip with BG44k, and my 3 most recent tanks have been
17.9 (75/25 highway/HARD city)15.9 (all city many WOTs)14.7 (driven HARDER than above)
That said this is proof to me that this stuff works and Im going to keep on a regular regiment of it.....
The key is using it on a road trip.... I will ONLY use it on road trips!!
I think that 17-18mpg city isnt too far off with my new o2 sensors which are coming soon!!!
Bg44k. I Am Sold!!!
I just ordered some BG44 from everythinginfiniti.com (great web service by the way) on the recommendations in this group. I have added it to my 1988 Mazda 929 and my 1986 Mark VII. I'll report back with results. I am pretty sure that this is what they used on my 60,000 mile service at the dealer for my 96 Q45.
-
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
I must have poured 50 cans into my gasoline in 262,000 miles.
I've gotten to the point where I use it once per oil change as it seems to minimize the power balance variations. {{ the engine has a drug addiction}}.
For the last few years I have been more a city than highway driver and my trips are CLASSICAL for injector problems: crank, 15-20 minutes, then off.
I've gotten to the point where I use it once per oil change as it seems to minimize the power balance variations. {{ the engine has a drug addiction}}.
For the last few years I have been more a city than highway driver and my trips are CLASSICAL for injector problems: crank, 15-20 minutes, then off.
-
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
Accelerations in 2nd [50-80= 3,700 to 6,000 rpm] is a pretty good approximation of engine power since no transmission shift to get in the way of accuracy.But a 1.0 second variance is extreme because that might translate to 100 HP............have you looked for a knock sensor code recently?Assuming that the coolant temp never gets above 194.9F during the run and you get at least 26 deg BTDC peak timing advance and the MAF voltage is correct [something peaking just at 4.3-4.35 volts.
After all the air flow into cylinders at each rpm is constant based on temperature and atmospheric pressure [humidity?].
You would be surprised at the range of variance [plus reaction to change time] that old MAF create [not failed just not accurate]. The AF ratio can be 5%,10,15, even 20% different between Q for the same rpm runs........usually less than 10%...........LUCKILY extreme richness doesn't degrade power as much as being too lean.
The Consult and a dyno test are the only sure ways.
I try to test [stopwatch] the Q at least every few months, good excuse to blow out the city driving crud.
You sure don't want to find out about problems when slicing and dicing between semis! When 1 second is 100 FEET.
After all the air flow into cylinders at each rpm is constant based on temperature and atmospheric pressure [humidity?].
You would be surprised at the range of variance [plus reaction to change time] that old MAF create [not failed just not accurate]. The AF ratio can be 5%,10,15, even 20% different between Q for the same rpm runs........usually less than 10%...........LUCKILY extreme richness doesn't degrade power as much as being too lean.
The Consult and a dyno test are the only sure ways.
I try to test [stopwatch] the Q at least every few months, good excuse to blow out the city driving crud.
You sure don't want to find out about problems when slicing and dicing between semis! When 1 second is 100 FEET.
-
elwesso
- Posts: 30810
- Joined: Sun Feb 23, 2003 4:52 pm
- Car: 94 Infiniti Q45t 5 spd
2007 BMW M Coupe
2007 Infiniti G35 S 6MT - Location: Indiana
- Contact:
Maybe the MAF could use a good cleaning again.....
WHen I did the runs, it was about 65-70F with near 100% humidity (minumum 85%)..... (poured the preceeding morning)
I havent check for a KS code, and if I found one i would probably ditch the car because I just replaced those things....!!
Assuming no problems with KS, is the MAF about the only other thing (a big decrease in less than 3 months)....
Im thinking coolant temp may be another thing too... I dont recall the fan coming on ever, but it still may be time for a good cleaning.
WHen I did the runs, it was about 65-70F with near 100% humidity (minumum 85%)..... (poured the preceeding morning)
I havent check for a KS code, and if I found one i would probably ditch the car because I just replaced those things....!!
Assuming no problems with KS, is the MAF about the only other thing (a big decrease in less than 3 months)....
Im thinking coolant temp may be another thing too... I dont recall the fan coming on ever, but it still may be time for a good cleaning.
-
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
Realistically, the O2 can only change things 20% [if they are dead] as there is a preprogrammed injector opening time [per rpm and TPS].............the MAF is almost unlimited.
Why you use the Consult at 60 mph flat no acceleration and record all the parameters. Then review the numbers and understand the effects of temperature and barometric pressure for that particular run. Something beyond the average technican.
IF 1.8 millisecs is normal and you read 2.0 millisecs YOU are sending 25% more fuel to the cylinders.
Because the ramp up time is 1.1 miliisecs [1.8 minus 1.1= 0.7.......2.0 minus 1.1= 0.9..........0.9/0.7= 1.2857 = 28.6% more fuel].
AT WOT [high rpm] [11.0 minus 1.1= 9.9 10.8-1.1= 9.7..........onlya 2% variation]
See 0.2 millisecs makes a much much much bigger differece at low duty opening cycles because the opening ramp up time is so significant.
THE FSM shows very broad readings at 2,000 rpm [1.4-1.9 volts for MAF] and [1.7-2.4 millisecs for injector open time] THIS is a 100% variation of fuel. Not possible from atmospheric changes
Yet from 120F to 30F the real variance is only 8%, now altitude could be 15%.
They should have provided a narrower range and a look up table for temp and altitude to help the technican.
You can't assume good means "right on" or anywhere near perfect.
The normal variations on injectors may be 5% so a single dirty one may force that bank to be 5,10,15, even 20% richer to net an average of 14.7 AF at the appropriate O2 sensor.
The Consult shows you left and right bank injector opening time and Average block learn correction from 100% [preprogrammed level].
When one Q gets 22 and another 24 and another 20 mpg at cruise [assuming exactly the same conditions and same brand of fuel in the same city]........you always start with fresh O2 assumming they are over 3 years or 50k, then a rail flush, then an induction clean and flush, a MAF clean, a basic timing check, an isle and running vacuum check, a cat back pressure checks [while you are changing the O2 [using this port to measure backpressure at idle, 2000 rpm and WOT]............lots of these things are never done!
Why you use the Consult at 60 mph flat no acceleration and record all the parameters. Then review the numbers and understand the effects of temperature and barometric pressure for that particular run. Something beyond the average technican.
IF 1.8 millisecs is normal and you read 2.0 millisecs YOU are sending 25% more fuel to the cylinders.
Because the ramp up time is 1.1 miliisecs [1.8 minus 1.1= 0.7.......2.0 minus 1.1= 0.9..........0.9/0.7= 1.2857 = 28.6% more fuel].
AT WOT [high rpm] [11.0 minus 1.1= 9.9 10.8-1.1= 9.7..........onlya 2% variation]
See 0.2 millisecs makes a much much much bigger differece at low duty opening cycles because the opening ramp up time is so significant.
THE FSM shows very broad readings at 2,000 rpm [1.4-1.9 volts for MAF] and [1.7-2.4 millisecs for injector open time] THIS is a 100% variation of fuel. Not possible from atmospheric changes
Yet from 120F to 30F the real variance is only 8%, now altitude could be 15%.
They should have provided a narrower range and a look up table for temp and altitude to help the technican.
You can't assume good means "right on" or anywhere near perfect.
The normal variations on injectors may be 5% so a single dirty one may force that bank to be 5,10,15, even 20% richer to net an average of 14.7 AF at the appropriate O2 sensor.
The Consult shows you left and right bank injector opening time and Average block learn correction from 100% [preprogrammed level].
When one Q gets 22 and another 24 and another 20 mpg at cruise [assuming exactly the same conditions and same brand of fuel in the same city]........you always start with fresh O2 assumming they are over 3 years or 50k, then a rail flush, then an induction clean and flush, a MAF clean, a basic timing check, an isle and running vacuum check, a cat back pressure checks [while you are changing the O2 [using this port to measure backpressure at idle, 2000 rpm and WOT]............lots of these things are never done!
-
Infinitiguy19
- Posts: 7787
- Joined: Sat Dec 22, 2007 4:58 pm
- Car: 1993 Infiniti Q45 188580 Miles
1994 Infiniti Q45a 240000 Miles
Re: (Q45tech)
Tech are you saying that the Nissan Consult (1 or 2?) show the self learn learn for the injectors and what they are currently at now?Q45tech wrote:The Consult shows you left and right bank injector opening time and Average block learn correction from 100% [preprogrammed level].
Damn this was way back when Tech would actually visit the General chat...Damn