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Location:
coffs harbour
Registered:
July 2003
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GtFour Boost cut
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Sat, 05 July 2003 08:02
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my mate has a gt four celica.
we wanted to know a few things bout them.
when he gets up the car and it hits 10 psi it stuters and wont go any further, almost like a boost cut.
is there a boost cut at 10 psi standard?
also there are 2 hoses comming out of the wastegate. one goes back into the turbo, which is where we have hooked up the boost controller. the other goes into the throttle body and has other stuff running from it. what is the second one for? is there any way another boost controller is hooked up to that. as when he first got the car second hand, it already would hit 10psi, and we were hoping by putting the boost controller in we could control the boost. but it doesn't. any help?
thanks
tai
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Toymods Board Member
Location:
Sydney
Registered:
May 2002
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Re: GtFour Boost cut
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Sun, 06 July 2003 05:42
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ok... fuel cut is around 12psi (give or take a couple of pounds as it does vary slightly between cars)
sounds like your problem though is more likely to be your boost controller installation
assuming you've installed it correctly you need to disconnect the other vaccuum line - it goes to the turbo vsv which allows the ecu to control the boost
disconnect then plug it and that should hopefully solve your problem
if you are hitting fuel cut then you will need a fuel cut defender to go beyond it... but i personally wouldnt get one unless you had the mods to handle the extra boost
hth
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Location:
coffs harbour
Registered:
July 2003
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Re: GtFour Boost cut
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Sun, 06 July 2003 10:47
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ok, one line whent from the wastegate straight into the turbo. this is the one we installed the boost controller into.
the other line out of the wastegate goes straight into the throttle body. which one were you suppose to run the boost controller off?
i was assuming that his car had had the boost upped already throught the ecu, so i was looking at disengaging this. but i wasn't sure what boost the gtfour ran at standard.
so if i cut the line going from the wastegate to the throttle body and plug it, the boost controller should work fine?
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Registered:
September 2002
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Re: GtFour Boost cut
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Tue, 08 July 2003 01:04
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If you install the boost controller btn the wastegate-turbo line and cap the ends of the other hose from the wastegate it should work fine.
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Toymods Board Member
Location:
Sydney
Registered:
May 2002
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Location:
coffs harbour
Registered:
July 2003
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Re: GtFour Boost cut
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Tue, 08 July 2003 02:26
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thanks mate,
i will try it thisarve. hopefully this will work.
what boost would you recommend running.
it looks like it has a non stock top mount intercooler, maybe of a supra someone said, full exhaust (bout 3"), and tomorrow will have a fuel cut defender. the air intake is quite cool after the cooler.
we were going to take it back to 7 or 8 until the fuel cut defender was in, and then maybe leave it at 12.
at the moment when you hit boost it basically feels like it shits itself, i think this is the fuel cut.
would there be any reason why: in different gears the fuel cut is at different boost levels? in first and second its rather high and then as you go up more gears, it seems to cut out at a lower boost, till in 5th gear it cuts out at about 7psi???
any ideas?
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Location:
coffs harbour
Registered:
July 2003
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Re: GtFour Boost cut
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Tue, 08 July 2003 02:35
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i thought i followed the other line pretty good, as i had half the bolt on stuff of the engine. it did go deep into the engine but seemed to surface somewhere near the throttle body, and when into it on the inlet side. as this would provide a pressure for the wastegate to function.
maybe i just followed the wrong lead? i'll look again before i cut anything. any ideas on an easy way to get to the lead?
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Toymods Board Member
Location:
Sydney
Registered:
May 2002
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Registered:
September 2002
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Re: GtFour Boost cut
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Tue, 08 July 2003 04:04
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You can set the boost up to 14psi with no problems. Fueling will not be an issue at this boost level. The weakest link is the top mount cooler which becomes inefficient after around 14psi. If yours is an aftermarket unit, which are not common, then maybe 15-16psi can be handled, although this is not recommended. The turbo is not very efficient after that point anyways.
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Location:
Colac, Victoria
Registered:
May 2002
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Re: GtFour Boost cut
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Tue, 08 July 2003 11:12
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mine runs this described setup on a basically stock motor bar the fuel pressure being jumpered to run at 13.5 v
Mine runs maxumum 14 pound of boost when the boost controller is wound to maximum ( as it was on dyno day )
ive got no detonation issues - motor runs happily ( so far ) and you can definantly notice the extra go ..
it ran 113kw on the rollers at the shootout - which going by the other gt4 's there that ran stock - ( bar the 205's ) it was up about 10KW on them - not alot - but its there - plus you can wind it down in traffic if you dont want the thing to suddently launch
any more boost than this and you really start having to look at upgrading the stuff around the motor ( ie intercooler , ecu , fuel pump , turbo upgrade/highflow + exhaust/dump pipe ) + strengthening of internals
mind you im still learning about it - and whats been done to it - so ill leave it as an example of what just the boost contrller does when properly installed
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Registered:
September 2002
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Re: GtFour Boost cut
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Wed, 09 July 2003 02:41
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If you only got a 10kw increase with an extra 6-7psi of boost, than I think there is something seriously wrong.
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Location:
Colac, Victoria
Registered:
May 2002
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(should have an arrow on it)