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Boost Tapering Off by Redline (20g)

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oneslowwdsm

oneslowwdsm

10+ Year Contributor
858
124
Mar 30, 2009
Spring, Texas
So I'm having an issue with my 20g turbo holding full boost at high rpms. It will spike to 24-25 and then by 7k RPMS I'm at 20-21. I'm currently running a BEP exhaust mani with a Tial 38mm wastegate. Hallman pro ball and spring controller. I've tried tightening the BOV (Type-S) swapping boost controllers, and a BLT but only for a few lbs because my compressor is weak. My vacuum reads about -19 at idle. The car runs and drives great and goes like a rocket. My AFR's are around 12.3 or so on E85 at WOT. Thanks for any advice.
 
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