Boosting Problem

[Mid_Nite_R33]

I have an R33 gtst, with mild mods, FMIC, pod, full exhaust and T piece boost controller

My problem is that sometimes the car goes hard and the next minutes it doesnt boost at all and drives like shit, the boost gauges just goes to the "0" position and the car simply is NA, while this is happening there is a resonating/rattling sound coming from somewhere in the front of the engine, possibly turbo? Then a few moments later it boost to 10 psi like it should and goes hard

The car was dynoed about 2 weeks ago and since then its been like that.

Would it be something to do with the wastegate?

If anyone can give me some advice I'd appreciate it.

Thanks

[siddr20]

Not to sure if you checked this or not..

but could be spark plugs?

Post your dyno sheet as well.. See if you getting flat spots or not...

Hmm sound coming from front? not good to hear.. but can be anything..

[Mid_Nite_R33]

Not to sure if you checked this or not..

but could be spark plugs?

Post your dyno sheet as well.. See if you getting flat spots or not...

Hmm sound coming from front? not good to hear.. but can be anything..

before the dyno run car had copper plugs pregapped to 0.8mm, for the dyno run the tuner put in new copper plugs and gapped them to 0.6mm

As for the sound it can be anything but it seems definately related to the car not boosting because when the car goes hard like it should the sound isnt there

Edited June 6, 2007 by Mid_Nite_R33

[siddr20]

0.6?????????????????????????????????

umm put them back to 0.8..

i think 0.6 is way to much..

Anyone else think the same?

Edited June 6, 2007 by siddr20

[Munkyb0y]

yeah i agree. go back to 0.8 if there was no issues before.

[sxc33]

0.8 is the way to go.

[Mid_Nite_R33]

the tuner put in 0.6 plugs for a computer that was meant to be tuned along with higher 12 psi boost level. but in the end wasnt and the plugs stayed.

How can the smaller gap prevent the car from boosting and what would that noise be?, and on the other hand it boost most of the time..

[siddr20]

Which ecu was meant to be tuned?

[Mid_Nite_R33]

link ecu, but the coilpacks didnt seem to hold up and there was other issues, so i went back to stock ecu for now and now i have this problem.

[siddr20]

I seriously think you should put those 0.8 gapped plugs in..

Try those out and see.. Im sure it will fix it..

AS for the noise.. no idea man.. Maybe go back to the place where you got the dyno done and him what it is.. Tell him its been happening since you got the dyno done..

[Devils_Advocate21]

exhaust manifold gasket FTW!

[Mid_Nite_R33]

will put the BKR6YEA plugs back in...

[Mid_Nite_R33]

exhaust manifold gasket FTW!

would the exhaust manifold gasket be gone if the noise is not constant and only happen when the car runs no boost?

[cheez]

check your zorst, i used to have a rattle thaht sounded like was coming from the front of the bay and ended up being a snapped cat zorst nut that let the cat rattle against the front pipe. check the zorst!!

[Mid_Nite_R33]

check your zorst, i used to have a rattle thaht sounded like was coming from the front of the bay and ended up being a snapped cat zorst nut that let the cat rattle against the front pipe. check the zorst!!

I got the exhaust checkd, the guy banged it and rekons there is nothing wrong with it...hmmm

What happened with you exhaust? whats a cat exhaust nut? u mean u had a bolt loose in your system or what?