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Location:
Newcastle
Registered:
June 2004
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Boost problems in st185 gt4
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Fri, 22 April 2005 04:43
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Hey guys i need your help cause im stumped as to why my car is behaving as it is atm  My car is running smooth for general driving around and doesn't seem to have any issues but when im on boost it wont go past 5psi it has a boost controller in it and when i try and turn it up it gets to 5psi then gets jerky and wont go any further. I know its not the boost controller cause i have used a mates one and it does the same thing it used to work fine and this was with the boost controller set to 8 psi, any ideas what the hell is goin on? i have no idea....
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Location:
Brisbane
Registered:
February 2003
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Re: Boost problems in st185 gt4
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Fri, 22 April 2005 05:33
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is your turbo VSV disconnected?
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Location:
Newcastle
Registered:
June 2004
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Re: Boost problems in st185 gt4
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Fri, 22 April 2005 05:48
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i dunno  is it the thing that controls the standard boost ?
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Location:
Perth
Registered:
February 2005
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Re: Boost problems in st185 gt4
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Fri, 22 April 2005 08:00
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Its behind the engine, faces the fire wall. Mine in anodised blue.
My GT4 did the same and it was one of these small bore hoses had come lose. The one on the drivers side if momory serves me right.
I think most people ditch these any way. Dont ask me how, my boost controler was on the car when I bought it and I havnt had to worry about it.
Pretty sure SPECTRAL will have an idea.
Good luck, MIKE. 
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Location:
Brisbane
Registered:
February 2003
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Re: Boost problems in st185 gt4
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Fri, 22 April 2005 08:40
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you'll need to disable it prior to boosting the car.
Unplug the second line coming off the wastegate actuator (the one leading behind the engine. And cap it off tightly.
Stick another cap on that second outlet off the wastegate actuator and tighten it with a small hoseclamp.
Now you boost controller taps into the line that runs between your compressor housing and the wastegate actuator.
Done.
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Location:
Newcastle
Registered:
June 2004
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Re: Boost problems in st185 gt4
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Fri, 22 April 2005 09:32
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I'm pretty sure that's how it's setup now (i have the same setup too and mine works fine except for the 1psi spike almost everytime). Any other ideas?
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Location:
Sydney
Registered:
September 2004
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Location:
Brisbane
Registered:
February 2003
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Location:
Syd
Registered:
October 2004
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On Probation
Location:
Sydney
Registered:
April 2005
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Re: Boost problems in st185 gt4
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Sat, 23 April 2005 12:31
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its prob the inake hose before the turbo. They split and it will suck air after the AFM a bad thing. I have a straight intake if ya want it. It has room for the AFM and the a K&N air filter.
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Location:
Newcastle
Registered:
June 2004
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Re: Boost problems in st185 gt4
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Mon, 25 April 2005 23:31
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Thanx heaps guys that gives me alot of things to check out. Sounds like its probably some sort of air leak or as spectral says it could be my intake manifold bolts being loose. Also as opasan says is it bad to drive the car when its not boosting properly? Also ralfross will the straight intake fit if the battery is in the stock position because its a very tight fit in the engine bay atm. Thanx for all the suggestions guys
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Location:
Brisbane
Registered:
February 2003
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Re: Boost problems in st185 gt4
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Tue, 26 April 2005 09:08
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its not going to do terminal damage to the engine, no. But it certainly isn't doing it a lot of good. Since you'd be running pig rich, things like the O2 sensor can suffer long term. Plus your fuel consumption won't be crash hot.
And no, the straight intake won't fit without:
(a) A pod filter
(b) Relocating the battery
(c) Extending the AFM loom and plug.
(d) Buying new breather/PCV hoses
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Location:
Newcastle
Registered:
June 2004
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Re: Boost problems in st185 gt4
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Tue, 26 April 2005 23:23
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Thanx Spectral i didn't think it would.... Hopefully i can find the source of the problem maybe this weekend if i get some time.
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