boost question

little240boy · Sep 28th, 2005, 12:10 PM

http://www.we-todd-did-racing.com/w...DEzZGZkMzF5NTQx

This is a dyno chart from about a month ago. I believe that this is indicating a boost leak, and the place I'm almost certain its coming from is from the actuator. Shouldn't the actuator hold the ~9.5 PSI all the way through the powerband instead of steadily declining like it is? A boost controller should only allow me to obtain higher boost, not necassarily just hold pressure correct?

Joel · Oct 3rd, 2005, 12:22 AM

The link dont work.

But... electronic boost controllers are better at compensating for boost fail by altering the amount of boost that is gated. If the boost starts to drop they just bleed less pressure to help keep the turbo spooling. "Dumb" bleed valves cant do this.

You must also consider the efficency of the turbo. The factory T25G on an SR for example drops off boost over about 5000 RPM

little240boy · Oct 4th, 2005, 04:19 PM

Sorry I don't understand what it up with these links sometimes. Here I'll try it again. Its an Rb20DET

http://www.we-todd-did-racing.com/we...EzZGZkMzF5NTQx

Joel · Oct 4th, 2005, 10:13 PM

maybe try an upgraded wastegate actuator like an HKS one but you arent running that much boost. Could be a leak...

little240boy · Oct 5th, 2005, 09:15 PM

I've looked into getting an aftermarket actuator, particularly HKS. I can't find one for the RB20DET, only an SR motor. I think I may be able to get used but the pressure should at such a low pressure rating shouldn't it?