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Old 04-18-2004, 03:53 PM   #1
lotusTT
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Join Date: Aug 2002
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2002 BMW M Coupe
Steel Gray

Default Turbo porting problems

I finally got a change to take my turbo out and port the wastegate, but it didn't quite work. I took out a good amount of material, and it seems like creep is slower, but I still get up over 10psi when the wastegate is set to 5. At partial throttle or in lower gears, I get 5-6 psi and it stops. But sometimes in higher gears though it justs keeps going and I have to let off once it hits 10psi. Is it possible that the wastegate just isn't going to let me run this low of a boost? The turbo is a VF30.

I don't really want to take the turbo off again, so I'm going to start researching pop off valves to limit my boost. Any ideas where to start looking?
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Old 04-18-2004, 11:32 PM   #2
Homemade WRX
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I thought they had springs set for 8 psi...
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Old 04-18-2004, 11:46 PM   #3
Bobalouy
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Greddy makes a Pressure relief valve, forget how low it goes though.

www.greddy.com
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Old 04-19-2004, 12:27 AM   #4
lotusTT
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that greddy valve looks perfect, it looks like it goes 1-25psi. Thanks!
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Old 04-19-2004, 01:49 AM   #5
Avenger
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Make sure your vacuum line is hooked up correct. I hooked mine up wrong before and it went up to 10 psi on my 7psi spring. I can't remember of the top of my head but I think only the nipple on the side is connected and the top nipple is not connect. Oh btw my wastegate is the standard HKS one.. so not sure if it applies to you.
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