Boost Creep issues

ICEMAN · 'Girly Man' Joined: 06 Oct 2008 Posts: 917 Location: Perth

Ok so I have both turbos boosted, But when the car boosts overall boost the neddle hit 18psi then creeps past this all the way to 20 then hits boost cut, I have tried setting the overall boost lower but now it just boosts to say 15psi then creeps all the way backup to 20psi and boost cut.

I was running a manual boost t for the first turbo and HKS EBV for the overall boost. I have only just tried removing the EBV and replacing over all boost with another boost t but still the same result.

I think it has something to do with the waste gate or blow off valve, just not sure which or if both.

Any help or advise would be great.
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Greeny · Posted: Fri Apr 03, 2009 4:17 am Post subject:

What exhaust, Filter?

Restrictor plate helped on my car, as did going back to stock airbox.
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ICEMAN · 'Girly Man' Joined: 06 Oct 2008 Posts: 917 Location: Perth

Ahh ok interesting.

I am running 2.5 inch downpipe without cat that was already on the car then into 3inch into 2.5 inch, I know its pointless but was unaware of the 2.5 downpipe.

Have pod filter, FMIC, NEO, 540 injectors not sure if you need all that info.
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Greeny · Posted: Fri Apr 03, 2009 12:59 pm Post subject:

Lot of flow there for the stock wastegate (which is allergic to flow).

http://www.jzs147.com.au/forum/viewtopic.php?t=3029

OR try stock airbox, if you have one still.
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ICEMAN · 'Girly Man' Joined: 06 Oct 2008 Posts: 917 Location: Perth

Mate great advise thanks heaps, I am lucky to have kept almost all of my stock parts so I will chuck the air box back on tonight and see how it goes.

Just out of interest cant you put an after market wastgate on or deas it not work like that.
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"Crack Fox" Im gonna hurt you real bad when we get inside........"Vince" Whats that "Crack Fox" nothing just a funny funny funny sound

skeez · Posted: Fri Apr 03, 2009 2:30 pm Post subject:

yeh you cant do it unless you bore out the internal flapper , weld it shut and do a external gate.
Both which you really dont want to do .

Greeny · Posted: Fri Apr 03, 2009 2:32 pm Post subject:

Aristo · Posted: Fri Apr 03, 2009 2:54 pm Post subject:

Its easiest just not to do downpipes on these things.

Greeny · Posted: Fri Apr 03, 2009 3:36 pm Post subject:

Exactly.

But for many, its too late Sad

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Dazwaaah · Posted: Fri Apr 03, 2009 4:41 pm Post subject:

mean while i'm going to be running a 4" dump lol
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OSEAN · Posted: Fri Apr 03, 2009 4:59 pm Post subject:

Dazwaaah · Posted: Fri Apr 03, 2009 6:10 pm Post subject:

toilet can.....

me on the other hand...
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ICEMAN · 'Girly Man' Joined: 06 Oct 2008 Posts: 917 Location: Perth

Alright put the stock air box back in and it has help a lot with the boost creep, I think I will just have to keep things how they are until the single.

Thanks all for the help, and hope this helps others.
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"Crack Fox" Im gonna hurt you real bad when we get inside........"Vince" Whats that "Crack Fox" nothing just a funny funny funny sound

lysdexia · Posted: Thu Apr 09, 2009 1:40 pm Post subject:

Greeny · Posted: Thu Apr 09, 2009 4:48 pm Post subject:

Easy fix.
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