Wastegate Not Screaming? Lost Boost Too.

[AlpineFreak]

hi all,

Cruising into work tonight i decided to have a bit of play, shifted into 4th at high revs and wastegate didn't open (couldn't hear screamer) and i'd lost boost. I can hear turbo spooling but not coming onto boost. I pulled over and car began to idle really rough. I'm not too sure what's going on, any help will be appreciated.

Car mods:

GT35/40

PowerFC

FMIC

Blitz spec R Boost controller

bosch 040 pump

turbosmart ultragate into screamer pipe

550cc injectors

Turbosmart BOV

Thanks.

[paulr33]

does it still make boost ? any loud pops or bangs or smoke ? have you checked all the cooler hoses / piping ?

[AlpineFreak]

haven't been able to really check anything yet, cause i had to get to work. But there was no loud bangs or anything.. Definately gotta check everything out tomorrow. I'm hoping it's just something simple.

I don't think it was makin boost, or very low - not pulling as hard.

[Amaru]

Probably popped an intercooler pipe, check to make sure they are all connected and clamps done up tightly

[AlpineFreak]

would that cause the rough idle though?? i'll check her all out in the morning and get back to ya. thanks

[scathing]

Yeah, check for leaks on the intake side. Your wastegate won't open until you hit a certain level of boost, but your turbo would still get spooled.

You should take it easy, since it therefore means your turbine speed isn't being regulated anymore.

Any leaks in the intake would cause rough idle, and stalling issues. Just ask any n00b who sticks a venting BOV, with the spring set loose, on their car.

[Craved]

would that cause the rough idle though?? i'll check her all out in the morning and get back to ya. thanks

<{POST_SNAPBACK}>

i have blown 2 IC hoses since my new install went in .. pretty close to yours.. only thing is that my car wouldn't run AT ALL with the hose off.

could be a split in a silicon hose enough the limit boost but allow air though..

only other thing would be turbo seizing.. or gate stuck open..(but you would notice the noise with a screamer pipe..

good luck.. hope it aint nothing major for you.

[floody]

Sounds very much like when my turbo seized up, right down to the rough idle.

[MattSR]

Its unlikely for a new GT series turbo to seize up that badly. It sound more like a leaking inlet pipe has blown off...

the AFM is reading more airflow going into the enigne that what really is (cause of the leak) which is why its idling rough

[R31Nismoid]

Same as every other time this thread comes up about loss of boost...

I/C piping has popped off somewhere

cheers - ash

[AlpineFreak]

hey all,

thanks for all the help, i actually found the source of the problem. I've got my Z32 in series with the intercooler and the Z32 had actually cracked underneath. Replaced it and running like a beauty again.

B)

[R31 POWER]

Cracked from the boost pressure you think?

[AlpineFreak]

nah don't think so, only running 15psi (producing 268.1rwkw). The Z32 was 2ndhand when i got it, so not too sure of it's life. Problem fixed though.

[R31Nismoid]

Z32 after or before the turbo?

to crack an AFM it would need a fair bit of abuse outside an engine bay me thinks

[AlpineFreak]

Z32 is right before intake plenum, sits right near the top of the radiator.

I'd have to agree on the abuse side. <_<

Edited November 30, 2005 by AlpineFreak