Weirdness. really weirdness.

[stevespeed]

I have a 93 240sx SE and my buddy has 91 base model, both are pretty close to stock but mine is a lot slower, I am 100% stock engine, just very well maintained. my buddy's car has a cold air intake and deleted cat, but is WAY faster than mine, much more than it would seem by the 2 mods.. does this make sense, or does that 100 pound stereo that was in the back of my car make that much of a difference.

[JeromeS13]

Add that to the fact that your car weighs more to begin with, and yes, it makes sense. That, and he's probably a better driver than you.

[rsmithdrift]

How far back were you???

You would weigh about 170lbs more than him being an SE with a 100lb box and his mods only add 2-3whp so it makes perfect sense to me for him to be faster. Just not by much. Check you compression lately???

[stevespeed]

This is based on my friend driving the cars and comparing them. His feels faster, but mine has the viscus and gripper tires.. and yes he is one heck of a better driver than me... for now and possibly forever. Dont know. But I do want to check the compression, and we are not talking about a 2-3 whp difference more like a 20-30 whp difference with a comparable amount of torque. I am starting to think that some one (previous owner on his car) messed with the timing and took off a few fuel cut offs. Something about 120 in 4th.

[rsmithdrift]

In which car are you talking about......I'm confused now.

And yes, if you hit 120 in 4th then you have no fuel cut off.

[BIGT94z]

[QUOTE=stevespeed] are not talking about a 2-3 whp difference more like a 20-30 whp QUOTE] there is no way u can get that from 2 small mods

[kapower06]

Well the 91 already have more horsepower stock for stock aginst the 93 add that to the stereo and the other extra weight ( your weight vs. his weight ) . and its possible he can walk you.

[rsmithdrift]

Well the 91 already have more horsepower stock for stock aginst the 93 add that to the stereo and the other extra weight ( your weight vs. his weight ) . and its possible he can walk you.

What are you talking about???.........

91 and 93 240's have the same damn motor. How could a 91 have more power than a 93 when both are in stock form.

You were going to loose.........If both of you drove EXACTLY the same and you had the same tires......power to weight ratio determines that he'd beat you but just barely........if you lost big time then either you can't drive or your car's not up to par.

[DjPantsSpecR]

well. being 170 heavier is almost exactly the same as a difference of 10 wheel ftlbs of torque, which is a lot in these low output motors. and also around 10 crank hp, so i wouldnt be surprised.

BUT, if you are losing tht bad, its very possible your coolant temp sensor is a piece of ****. Bad CTS have been proven on dyno to lose 30 hp over stock.

a car with bad cts drives like a dog until about 5500 rpms (incidently where VTEC is) then at this point the car all the suddent comes alive and picks up (also, sorta like VTEC). at this peak power point dynos show you are still 8-10 whp under stock. So you can go to nissan and spend 25 bucks if any of this sounds familiar and you will get much power back into your baby.

also with a 7k rev limit no one is going 120 in 4th without an automatic....

[stevespeed]

Also the 91 had the biggest cam's of all KA's correct?.I am thinking the stereo, sunroof, and power options are affecting, but also the funny thing is that when I hit about 5500 or 6000 rpms the car just seems to run out of power completely. Its still running, but the "oomph" is gone, this is also probably called "finding your power ban"

[corn322]

S13 KA24DE's all had the same cams.

[BIGT94z]

when I hit about 5500 or 6000 rpms the car just seems to run out of power completely. Its still running, but the "oomph" is gone, this is also probably called "finding your power ban"

all ka's dont make power past 6000 rpm (stockish) i know when i got dynoed i stoped makin power @ 5920..thats why u ran outta "oomph"

[cdlong]

are not talking about a 2-3 whp difference more like a 20-30 whp there is no way u can get that from 2 small mods

that's his point, the mods should only make a few more horsepower but the car is faster like he added 20-30 hp. the a cat delete and intake will probably add more like 5-10 hp but still not much.

you can do 120 in fourth at 6800 rpm.

what tires and wheels are you both running? are they stock size? heavy wheels and larger tires can slow your car down a lot. even performance tires can slow your car down because the stiff sidewall adds a lot of weight.

the extra weight does a lot, as does the placebo effect. race the cars head to head for a direct comparison. his may just feel faster because the intake and cat improved engine response a little. check your timing and the other stuff mentioned, o2 sensor is another one.

[stevespeed]

O2 sensor never occured to me thanks.Also here is the next funny one. i have really nice sticky tires and my buddy (who is a ton faster) has the crappy tires that are found on like geo metro to the point that I was able to tie his time in an autocross event using a 3G Eclipse V6 Automatic. (granted the eclipse had some nice yoko's on it). but him and I are running stock sized tires on stock rims/steelies.

[AmoebAssassin]

O2 sensors are not an issue in accellerative contests, because @ 100% throttle the ECU is running closed loop fuel mixture and is only paying attention to things like engine temp, RPM, TPS, and MAF voltage. Crappy gas mileage is a much better sign of a dumped O2 sensor

[DjPantsSpecR]

this man knows whats up.

thats why your car runs pig rich under WOT, it isnt listening to the o2 sensor, it runs off the factory WOT map and uses other inputs as mentioned earlier.

[stevespeed]

Found one problem, I have stock air box, and it had holes in it form age causing a slight pressure loss. A homedepot ram air kit was fabricated in its place (and the AC was turned off... duh) and the stereo removed + spare + jack + tools so I lost about 150+ in the rear.

[DjPantsSpecR]

did you check the spec on that CTS yet?

also 240's shut off the AC while under WOT, so thats not an issue either

[stevespeed]

No havent check that yet, and also I did not know that about the AC thats sweet.

[rsmithdrift]

did you check the spec on that CTS yet?

also 240's shut off the AC while under WOT, so thats not an issue either

Wow, that kicks ***!!!!!!! I did not know that.....so I've been turning off my a/c when I mountain run and spot race for no apparent reason all this time huh?? Well that's one of the coolest things I've ever heard off. Rock on!!!

[DjPantsSpecR]

well it only shuts off under WOT so its still beneficial to have it off under many cicumstances.

But im relatively certain that it says in the FSM and/or the manual that comes with your car, that it shuts off under WOT. I know that it does, and i know ive read it in one or both fo those places

i ditched it ion one of my cars, but in the daily driver i cant get it to work, ironic. Something somewhere isnt connected...