Herblenny

iTrader: (13)

I'm having crazy boost issue..

My recent issues been the primary turbo.. i have some clue about it but need some input from you guys.. if you don't mind...

So, I think this is whats been happening..

I recently drove to ATL for Petit Le Mans.. On my way there, i had zero problems.. after 2 days in ATL, i'm coming back.. I hit .85 bar on both primary and secondary turbo.. After that, all day (200 mile trip back).. I couldn't hit more than 0.35 bar on primary turbo in any gear.. Best was on 4th.. 0.12bar on 2 and 3rd.. no boost on 1st.. BUT! I can hit 0.85 bars when secondary kicks in.. and it kicks in hard.. almost like non-seq set up..

I had similar problems before (past three weeks).. I checked my vac hoses, one way, re-routed my vac lines, checked my BOV lines, checked my secondary turbo actuator, checked and replaced solenoids (I went simplified turbo set up)..

And usually next day, in the beginning, boost works fine.. but than symptom begins as car warms up or when I start hitting boost.. I think its my IC hoses.. I checked.. and then it does it again..

Anyone could suggest anything for me?? Maybe I need to get a better clamps?? Is my couplers heating up and when it softens up its leaking boost only in primary?? Or am I some how switching to non-seq with PFC?? If so, is there a solution for it??

I'm checking everything.. or maybe is it my driving habit.. I hit boost after the car warms up.. and when I think about it.. its usually after one hard pull..

FormerPorscheGuy

Are you still running a cat? If so your cat may be cloged.

Herblenny

iTrader: (13)

Here are my mods..

PFC, simplified seq-turbo, AVC-R (both set at .80), DP, MP, apexi N1 dual with silencers, Greddy 2 row FMIC, greddy elbow, Blitz intakes, greddy pullies, efini-y pipes, block off plates (removed air pump, egr, acv, etc)..

Herblenny

iTrader: (13)

One more question.. what would happen if my solenoid is bad?? would heat affect the solenoids?? I was thinking maybe the turbo control or pre-spool solenoid might be going bad under heat?? would this cause similar problems as I mentioned earlier??

KevinK2

solenoid malfunction when hot is not that unusual, and likely the problem. may be precontrol is staying open when hot. could hot test 'em at about 150-160F.

911GT2

Have you checked out this site yet? http://www.autosportracetech.com/RX-...leshooting.htm They have tons of good turbo troubleshooting info.

Sounds to me like a precontrol problem, which shouldn't be too tough to fix.

911GT2

I'd tend to think not. Clogged cats usually show themsevles as boost dropoff at higher rpm, not lower. Theres much more airflow at higher rpm, and a partially clogged cat can't handle it.

Herblenny

iTrader: (13)

Hmm... I'll check the pre-control tonight..

Thanks for the advice..

Herblenny

iTrader: (13)

I just realized that i don't have pre-control solenoid.. Its been eliminated due to AVC-R..