99gstspyder69
Probationary Member
- 9
- 0
- Mar 21, 2013
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hollywood,
Florida
My 99 gst was on the dyno last night and there seems to be a problem with boost. I have an external tial 38mm wastegate with a 14lbs spring. 1st run 28lbs. It should of been a little over 14lbs. We disconnected the boost control solenoid and ran vacuum the the w/g and still pulling 28 lbs. We removed the w/g entirely and it built 10lbs. The tuner said it was the w/g IN pipe to the manifold is to small. Its 1" he said 1 1/2 it needs to be. Btw this is stock block, 272 cams, and a 7 blade hx35 with stock back housing. The manifold is a punishment racing budget manifold. Please help!