amanb

ive tried searching for this but i couldnt find exactly what i was talking about so here i go. i am having boost problems when i am at wide open throttle in second and third gear. the boost is set to 12psi and when i go wide open throttle it goes up to 12 then drops back to like 5-6 psi then the boost struggles to get back up to 12psi again, what could be causing this... PLEASE HELP!!

FormerPorscheGuy

You have a leak somewhere, check your intercooler piping and your y-pipe.

amanb

k thanks, ill check that

911GT2

Heres a great turbo troubleshooting link: http://www.autosportracetech.com/RX-...leshooting.htm

What rpms is the issue occuring at? I need a little more info to do a proper diagnosis.

amanb

the psi drops at about 4000 rpms and eventually reaches 12 psi again at the very top end of the gear, but it takes forever to get back up to 12...you can definitely feel the power loss

amanb

sounds like it may be exhaust restriction

xstacy7

My situtation was the same. I was only at 10psi though. Took the turbo's off and noticed a huge crack between the exhaust housing on the 2nd turbo and the wastegate. The exhaust gas was leaking in the higher RPM out the wastegate door.

Are your turbo(s) old/new? That's just my experience with it. But check for leaks first.

amanb

k ill check that too

MikeC

I have the same problem with my car. The boost is fine up to 4500rpm where it just suddenly drops to almost nothing and then goes back up slowly to maybe 6psi or something.

alberto_mg

Check your cat also. Just unbolt it from the downpipe and shine some light in there while peeking in. If you don't see a mesh-like screen then it is clogged.

fd3s_rx7

iTrader: (13)

Yep same here, our FD always be having that kind of problems... No boost..No boost from secondary..Did the vacuum job first and still doesnt fix it. So finally took off the turbos and wholla the problem was the Exhaust Housing too. Turbos were bad, leaking too. Replace it with 99 spec. turbos and I was back to normal boosting.

amanb

how much that run u?

fd3s_rx7

iTrader: (13)

I got these efini turbos from a friend... But it'll run ruffling around $2500.00 to $3000.00.

I was just going to rebuilt my stock, but figure that in the long run, these boost problem will just come back. That's why I decided to get the 280 HP turbos. (99 spec turbos) Spools up alot faster too. I also notice in between the switch of the transition it is much quicker too.