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New exhaust: boost creep, spike, cut

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SniperXr2

20+ Year Contributor
254
1
Mar 1, 2003
Arcadia, California
Hey guys, I just installed a new 3" HKS exhaust on the car, I then turned my mbc as low as I could before the screw came out, and I am still creeping to almost 20lbs, then when I shift(automatic) it jumps up to 25+ and I hit fuel cut. I have a 14b turbo, and when I put it in I did a small amount of porting on the o2 and on the exhaust housing but it doesn't seem to have helped. If you guys have any advice for me please tell me, I don't like having more power but not being able to use it. I know if I get a bigger pump I will be okay as far as cut goes, but then I have to worry about heatsoak, and at 20 lbs on a smic I think it will happen quick, especially in southern California. Do you think a better mbc will be more efficient as far as holding boost (I have an ebay one). Thanks in advance guys.
-Rob
 
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