vtec problem.....

[4doorkiller]

dont get me wrong, i love boost, but i have a major vtec problem...anytime vtec kicks in, whether driving or just reving, the car goes into limp mode. vtec pulls as long as i am full throttle, but once i am off the gas, the rpms start jumping, and there is no longer any driveability. i was told the P28 ecu was causing vtec to come on and stay on, not returning to low rpm driveability, but after swapping for another chipped P28, i had the same result...any ideas?

another thing: even though its hooked up, i am still getting a check engine light for my throttle position sensor. different throttle bodies and a whole new tps sensor produced the same result: a DTC code 7

[93accord]

If you've replaced the ECU and the sensors and neither made a difference it sounds like you have a problem in your wiring.

[quickangel93]

dude this is the forced induction section aka. turbo, theres a technical section you know?

[4doorkiller]

If you've replaced the ECU and the sensors and neither made a difference it sounds like you have a problem in your wiring.

now i did do some re-wiring, but the tps sensor was untouched...i'll pick up a voltmeter and run a few tests, but we will see....

[4doorkiller]

dude this is the forced induction section aka. turbo, theres a technical section you know?

you know what? you are absolutely right. here is my turbo question:

this is my first turbo build, and no one was able to help me understand this so far, but i noticed boost climbing with rpms. in my case, boost continues to climb until vtec kicks in, reaching full boost. i was wondering if i am supposed to reach full boost as soon as i am full throttle or do boosted accords all experience this "boost climb"?

the only information i was given on the subject was in order to reach full boost at wide open throttle before vtec, you had to retard the timing TREMENDOUSLY....

[quickangel93]

you know what? you are absolutely right. here is my turbo question:

this is my first turbo build, and no one was able to help me understand this so far, but i noticed boost climbing with rpms. in my case, boost continues to climb until vtec kicks in, reaching full boost. i was wondering if i am supposed to reach full boost as soon as i am full throttle or do boosted accords all experience this "boost climb"?

the only information i was given on the subject was in order to reach full boost at wide open throttle before vtec, you had to retard the timing TREMENDOUSLY....

sounds like you have turbo lag, what kind of turbo you running?

[4doorkiller]

sounds like you have turbo lag, what kind of turbo you running?

its actually built for top end performance, so that makes perfect sense. its a
60 trim AR .63 t3/t4OB

[quickangel93]

its actually built for top end performance, so that makes perfect sense. its a
60 trim AR .63 t3/t4OB

looks good, but idk whats the problem. whats your boost presure? and is the motor built? did you tune her?

[4doorkiller]

looks good, but idk whats the problem. whats your boost presure? and is the motor built? did you tune her?

stock engine, now boosting 10psi. it's been tuned, but it wouldnt hold boost past 5200rpm. figured out that problem, and now it need to be tuned again BADLY...
but the most psi i have reached before vtec is may 5 and 1/2 and then vtec turns on and it literally jumps to 10psi....i f*ckin love it, i just didnt know if it was supposed to do that or what not...
hey, when boosting these F series motors, a lot of these engines put out about the same amount of torq as horsepower huh? mine put out more torq than horsepower, and being that i am one of maybe like 3 boosted Accord in So Cal, these honda heads are going CRAZY with confusion...

[foamypirate]

Yeah, they do that, the whole more torque than horsepower thing. Gotta love it!

[quickangel93]

torque is better than hp.

[foamypirate]

Err...Horsepower is a function of torque. You're telling me a GSR that makes 185hp and 130ft-lbs of torque isn't as good as our 125hp and 137ft-lb tq F22?

[4doorkiller]

Err...Horsepower is a function of torque. You're telling me a GSR that makes 185hp and 130ft-lbs of torque isn't as good as our 125hp and 137ft-lb tq F22?

i am going to have to say yes and no...my best friend had a GSR and he would murder me in a drag race stock for stock. HOWEVER....when it came to time attack and road racing, he just couldnt keep up...

[NAiL05]

i am going to have to say yes and no...my best friend had a GSR and he would murder me in a drag race stock for stock. HOWEVER....when it came to time attack and road racing, he just couldnt keep up...

I have a hard time believing this. Your friend most likely sucks at driving. The GSR has really good agility especially road coursing. It should be the other way around. But oh well.

[Accord R33]

torque is better than hp.

yeah, birds are better than eagles too.