nathn_ep3

this post is for my friend. he has a 00 gsr swap in his 95 coupe. he used all the wiring harness and ecu from the integra so its wired for obd2.5. anyways, hwen he first finished the swap he took it to the track and was able to pull mid 14's. thing pulled hella hard. now, over the winter we put a jdm 4-1 header,skunk 2 manifold,and fpr on it and its been lagging ever since. he only pulled a 15.8 today.what could be the problem?? we need to fix this. help please

J.P. 4rm The dPk*

the driver

boostedEJ2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Spooner &raquo;</TD></TR><TR><TD CLASS="quote">the driver </TD></TR></TABLE>

Definately not the driver!

rodrez.

What's the fuel pressure set at? Did he have the car tuned? Or did he just add a few bolt ons?

nathn_ep3

fp is at 45 at wot, what should it be at??

rodrez.

That should be ok for the bolt ons he has. How about the motors condition. Have you considered doing a leakdown test? Checking the compression to make sure the motor is making the kind of power that it should be. Something could have gone wrong between the first and second track visit. That's a pretty huge time gap in terms of the numbers he pulled at the track. Same track? Similar conditions? Same tires/launch technique?

euclid

my guess would be the fpr, i think you can seriously screw up the fuel curve if you install one without proper tuning. i though you were only susposed to install one in conjunction with a seperate fuel controler.

nathn_ep3

same track, same conditions, the motor only has 30K on it, it should be good, it only started lagging after the new bolt ons, i guess thats the next step though if we cant figure it out, do you think it could be the ecu, i heard that obd2+ dont take well to mods, is that true

rodrez.

Well, that is true in a lot of cases. I know that the newer ECU's don't take to upgrades as well, but again, that's a huge ET gap. Any check engine light? Wondering if the increased fuel pressure is pissing off the ECU. Have you tried adjusting the regulator, leaning it out a bit?

euclid

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rodrez &raquo;</TD></TR><TR><TD CLASS="quote">Well, that is true in a lot of cases. I know that the newer ECU's don't take to upgrades as well, but again, that's a huge ET gap. Any check engine light? Wondering if the increased fuel pressure is pissing off the ECU. Have you tried adjusting the regulator, leaning it out a bit? </TD></TR></TABLE>

that gap is huge, a stock gsr integras will destroy that time, something is wrong with the ecu tuning.

nathn_ep3

we turned it down a little and it ran better but i dont want to go to low and lean it out, whats the lowest psi and still be safe.

rodrez.

I've seen a few guys running 38-39 psi on their GSR's with header/exh.

euclid

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludeEJ1 &raquo;</TD></TR><TR><TD CLASS="quote">we turned it down a little and it ran better but i dont want to go to low and lean it out, whats the lowest psi and still be safe.</TD></TR></TABLE>

i would try just taking it off and see what happens, return the fuel system to stock. is vtec engaging?

rodrez.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by euclid &raquo;</TD></TR><TR><TD CLASS="quote">

i would try just taking it off and see what happens, return the fuel system to stock. is vtec engaging?</TD></TR></TABLE>

That's a good idea, unless he's going to hit the dyno soon.

nathn_ep3

thats what we put it at and it ran a little better, but not 14's better. maybe he should do a obd1 conversion?? also the clutch is getting a little worn so maybe thats it too. or a combination of a lot of things. i've just never seen someone do mods and it make there car slower.

nathn_ep3

vtec is working, we'll try that and see what happens. thanks!!

rodrez.

[QUOTE=ludeEJ1 i've just never seen someone do mods and it make there car slower.[/QUOTE]

I have. That's why I think tuning is the most important part of performance set ups. It can make or break your motor, literally. Jumping down to an older ECU should help overall performance, but it seems like you still might have a problem somewhere. Seems like it ran damn good the first time around, so something went wrong in between track visits. Retrace your steps if you have time, make sure you didn't miss something when doing the bolt ons. Good luck

euclid

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rodrez &raquo;</TD></TR><TR><TD CLASS="quote">

That's a good idea, unless he's going to hit the dyno soon.</TD></TR></TABLE>

yeah, i really dont think it's a good idea to mess with fuel settings outside of a dyno, good luck

acuracing

Is he running the OBDII setup for emissions reasons?

R you serious

ever try dynoing einstein?

nathn_ep3

we dont have a dyno here in spokane, we have to drive pretty far for one. plus its not like its cheap. thats why i posted, to try to get help without spending alot of cash.oh and my name is nathan, not einstein.

Monkey Boy

actually, there is one in spokane. I can get you the info if you want.

u2civic1

u might need to change out that ecu cuz u got a skunk 2 manifold which doesn't have the second butterfly

turbo_ef9

hehe.. that car is as fast as mine is stock.. goshers nathans.. what do you guys do to these cars...

nathn_ep3

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eli_vang &raquo;</TD></TR><TR><TD CLASS="quote">hehe.. that car is as fast as mine is stock.. goshers nathans.. what do you guys do to these cars...</TD></TR></TABLE>
Your right eli, We dont know what we're doing. i mean, we only built our own cars that run 13's all day with only bolt ons and full interior.