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How Much Can I Turn Up The Boost?

Old 05-27-2004, 08:46 PM
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hey, i was wondering how i would go about turning the boost up on my 87 t2. everthing is stock on my car and it has 66,000 miles on it. is there anyway i could turn the boost from 5.5 psi to around 8 or 9 psi? and if i did, would this be safe with the stock fuel injection system and a stock engine? i just want to turn it up cause the car is capable of so much more power. well thanks for the help guys
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Old 05-27-2004, 09:03 PM
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the stock fuel system is ok for about 10psi, but you need a few things to get to 10psi, like an exhaust and a fuel cut defensor.



the stock ecu has a fuel cut at about 7-8psi* so you need a fuel cut defensor to go higher



*they kinda vary a bit
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Old 05-27-2004, 09:12 PM
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fuel cut defenders are evil things......dont turn it up at all unless you do something about a tune. rotaries dont like to be run lean.
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Old 05-27-2004, 10:23 PM
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well cant i just manually turn it up some how using the wastegate or wastegate actuator? on my friends piston engines it doesnt take much to turn up the boost.
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Old 05-27-2004, 10:38 PM
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you need to fit a bleed valve on the vacuum line on the turbo. there about $5 at any hardware shop.
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Old 05-29-2004, 12:03 AM
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what would my boost be raised to with a bleed valve installed? and is it safe? cause if it is i am gettin one first thing in the morning and installing it!!!!
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Old 06-01-2004, 03:03 PM
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on my car, the stock boost was also set at 4-5psi.



I bought a valve from Lowes for $8.00 and spliced it between 2 houses. 1 hose connects to the compressor housing of the turbo, and the other connects to the wastegate. Splice the valve in between.



The tigher you turn the ****, the more you boost you will gain. Note however, that you won't actually notice any change until the **** itself is almost completely turned tight. On mine, I have it turned all the way tight, and I run 10psi in 1st and 2nd gear. Then in 3rd, 4th, and 5th, I am at 12psi.



I however have all the other necessary mods to do this safely. Be sure to get a fuel-cut defender ($50 or so, wow) at the very least to keep from blowing your motor.



Hope this helps.
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