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tpunx99GSX · 04-28-2008

Hey guys,
I have been having this problem with my current setup and have racked my brain trying to figure it out.
I cannot boost over 1.5 bar, my target boost is around 30 psi (~2.xx bar). The turbo is a SCM6152e, boost controller is a AVCR, No boost leaks that i could see.
It seems like the turbo is REALLY laggy. I made sure the exhaust manifold gasket was good tonight. And the one between the mani and head were fine, the one between the mani and the turbo had two cracks on opposite sides. I wouldnt think that this would affect it that much. Would it?
Im making a new gasket tomorrow, made of 4 layers of thin sheet metal with copper spray between each layer.
Theres no shaft play on the turbo. The timing is good. I was thinking about rebuilding the RRE head i had that has 4 bent valves and trying that one. I would say boost leak but i wouldnt think that would affect spoolup greatly. The car sounds like its struggleing in the upper RPMs but no knock whatsoever. Any ideas what else could be wrong?

04-28-2008	#1
tpunx99GSX Tournaments Won: 3 Join Date: Oct 2003 Location: Maple Grove, MN Drives: Lancer and Durango Posts: 7,017	Cant boost over 1.5 bar... Hey guys, I have been having this problem with my current setup and have racked my brain trying to figure it out. I cannot boost over 1.5 bar, my target boost is around 30 psi (~2.xx bar). The turbo is a SCM6152e, boost controller is a AVCR, No boost leaks that i could see. It seems like the turbo is REALLY laggy. I made sure the exhaust manifold gasket was good tonight. And the one between the mani and head were fine, the one between the mani and the turbo had two cracks on opposite sides. I wouldnt think that this would affect it that much. Would it? Im making a new gasket tomorrow, made of 4 layers of thin sheet metal with copper spray between each layer. Theres no shaft play on the turbo. The timing is good. I was thinking about rebuilding the RRE head i had that has 4 bent valves and trying that one. I would say boost leak but i wouldnt think that would affect spoolup greatly. The car sounds like its struggleing in the upper RPMs but no knock whatsoever. Any ideas what else could be wrong? __________________ Scientific theories are the most reliable, rigorous, and comprehensive form of scientific knowledge. This is significantly different from the common usage of the word "theory", which implies that something is a conjecture, hypothesis, or guess.