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sleepydsm · 10-09-2005

Ok, well I tightened the BOV. That problem is solved. BUT with a boost controller on, the boost flies up to whatever it wants. It acts as if the wastegate is not hooked up.
This is hard to explain, sorry. The car only jerks and studders when you're at partial throttle, and the boost is building up. It gets to a certain point and just bucks and jerks around. At WOT, the car is fine, its just the boost is uncontrolled so that is a problem. Without a boost controller, my wastegate works fine. When the MBC is hooked up, the wastegate acts like it isnt seeing boost/vaccum. (so basically the boost is uncontrolled, and goes to whatever). I originally had an Elite MBC, so I tried another one. And the same problem is happening. And yes the screw is back out as far as possible. Any ideas? I'm gonna do a boost leak test, and see if possibly the MBC is leaking somehow, and therefore the wastgate acts as if it is NOT hooked up.

On another note, I wasn't having an issue with knock at all. I was hoping to run about 18-20 psi on 92 pump gas.

Thank you all for your input!
Kevin Swalchick.

10-09-2005	#12
sleepydsm Kevin Join Date: Jan 2004 Location: Shoreview Posts: 3,356	Re: Wastegate Issues Ok, well I tightened the BOV. That problem is solved. BUT with a boost controller on, the boost flies up to whatever it wants. It acts as if the wastegate is not hooked up. This is hard to explain, sorry. The car only jerks and studders when you're at partial throttle, and the boost is building up. It gets to a certain point and just bucks and jerks around. At WOT, the car is fine, its just the boost is uncontrolled so that is a problem. Without a boost controller, my wastegate works fine. When the MBC is hooked up, the wastegate acts like it isnt seeing boost/vaccum. (so basically the boost is uncontrolled, and goes to whatever). I originally had an Elite MBC, so I tried another one. And the same problem is happening. And yes the screw is back out as far as possible. Any ideas? I'm gonna do a boost leak test, and see if possibly the MBC is leaking somehow, and therefore the wastgate acts as if it is NOT hooked up. On another note, I wasn't having an issue with knock at all. I was hoping to run about 18-20 psi on 92 pump gas. Thank you all for your input! Kevin Swalchick. Last edited by sleepydsm; 10-09-2005 at 01:14 PM..