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Old 04-14-2005, 10:28 AM   #1
d00f
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Member#: 6000
Join Date: Apr 2001
Location: Ottawa, Canada
Vehicle:
2000 GC8 STi V4 swap
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Default UTEC STi Boost control...

I've got someone with a UTEC/STi and it has horrible boost control. The UTEC's boost control is not installed and instead there is a 2 stage MBC. Anything past 1/2 throttle results in full boost and obviously poor throttle response.

I tried to download the documentation on this version of the utec from turboxs but the link goes to their updated map.

I've been told the boost control in the utec is really poorly implemented and the few cars I've driven seemed to reflect this. I'm still willing to try it out myself and see before recommending an EBC.

-Michael
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Old 04-14-2005, 10:53 AM   #2
SlideWRX
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So what's the question;How to tune the UTEC Boost control?

1. Put the stock system back in
2. make sure you are in closed loop boost control (one of the parameters listings; 0 or 1 )
3. The boost map is based on throttle position. put 200 in the 90 & 100 sections all the way down.
4. Log a 4th gear run.
5. Add 50 to the boost map and re-log.
6. add until you are happy with boost. IIRC, boost will fall off with high rpm with a stock turbo.
7. If the boost spikes more than you want, increase the gain in the parameters section. go in 5 point jumps up at first.
8. boost tends to spike more when punching it from 4000 or 5000 versus 2000, so try that and see if the spikes bother you.
9. The GM solenoid (http://forums.nasioc.com/forums/show...light=solenoid) might work better than the factory FBC. I use it with the UTEC and like it.

Tom
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Old 04-14-2005, 10:55 AM   #3
SlideWRX
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Er, forgot:
10. Once full throttle boost is set, start dropping the values as you move down the throttle % columns. Below 70% I've basically got wastegate boost. Adjust to personal preference.

Tom
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Old 04-14-2005, 11:14 AM   #4
mbiker97
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Quote:
Originally Posted by d00f
I've got someone with a UTEC/STi and it has horrible boost control. The UTEC's boost control is not installed and instead there is a 2 stage MBC. Anything past 1/2 throttle results in full boost and obviously poor throttle response.
There is your problem. Put the stock boost control back in, with the supplied ABC.
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Old 04-14-2005, 12:37 PM   #5
hippy
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So you're trying to make the car slower? I don't hear that much around here. Not to question what's goin on, but does it really matter if you get full boost past 50% throttle? At 50% throttle the car will obviously accelerate slower then at 100% throttle even if you're gettin full boost(cause the throttle body is limiting the air going into the engine). If ya wanna go slower, don't press the pedal past 50%. I don't see the problem other then maybe a lead foot.

peace
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Old 04-14-2005, 02:27 PM   #6
AaronWRX
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Quote:
Originally Posted by mbiker97
There is your problem. Put the stock boost control back in, with the supplied ABC.
Do you have a sti? If you did, I don't think you would be telling people to use the ABC.

In fact, the default 375 values overboosted me 1-2psi.



DON'T use the ABC for a stage 1-2 STI. The manual is outdated.
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