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Old 08-16-2004, 06:32 PM   #1
Rick539
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Default Can an UTEC hold 20psi ?

I was told by a reliable source that the utec would reach but not hold 20 psi. Getting ready to install a VF22 and would like to get a solid 20psi boost curve. I have the mods to do it but will the utec hold it?
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Old 08-16-2004, 06:36 PM   #2
RiftsWRX
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that's dependant on the turbo... no boost controller in the world will get beyond the spring rate holding the door closed on an internally gated turbo.

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 08-16-2004, 07:05 PM   #3
WRX Jim
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my vf22 held 22psi till about 5500 rpm
as it dropped off slowly...
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Old 08-16-2004, 08:08 PM   #4
Rick539
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So the utec will manage 20 psi. The limitation then is the wastegate. Does the spring mod help. How about the mbc and abc, will they stand up or will they need to be changed?
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Old 08-16-2004, 09:18 PM   #5
Macabre
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http://forums.nasioc.com/forums/show...ight=wastegate

20psi@7000rpm is a tall order with this setup. The turbo can do it, especially if you wire the wastegate closed, but it's hard to get the OEM boost control solenoid or even an MBC to do it unless you run a lot more boost in the mid range. The UTEC doesn't have much to do with it.
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Old 08-17-2004, 07:23 AM   #6
ride5000
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use the gm solenoid mod. since it is interruption based instead of bleed based, it is much more effective at preventing the wg from opening prematurely.

you eventually reach a point where the spring can't keep the wg closed due to the exhaust gas back pressure on the manifold side pushing it open. that's when you need more wg spring tension.

hth
ken
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Old 08-17-2004, 07:47 AM   #7
TheMadScientist
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The Utec will handle ANY amount of boost that you want to run. It is the other parts of the boost control system that won't. That is why TXS uses an ABC with the Utec.
Wow I seem to be agreeing with ride5000 alot today. Setup the GM solenoid and then you are mostly limited to the flow/pressure of the turbo without the need for an ABC. Just remember to change the map scaling in the Utec. I set the max scaling pressure at 2-3psi more than what the car will run. That way you have an over boost colum in the maps.

TMS
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Old 08-17-2004, 10:55 AM   #8
SlideWRX
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Also, if you are using the Stock BOV/bypass valve it may not hold 20 psi. Some do, some don't - a bit of variability from the plant.

But yeah the UTEC can command any boost that the system can hold.

Tom
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Old 08-17-2004, 11:09 AM   #9
TheMadScientist
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Quote:
Originally Posted by SlideWRX
Also, if you are using the Stock BOV/bypass valve it may not hold 20 psi. Some do, some don't - a bit of variability from the plant.

But yeah the UTEC can command any boost that the system can hold.

Tom
This
http://forums.nasioc.com/forums/show...hreadid=454965
Will fix the BOV.

TMS
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