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Registered
Join Date: Jan 2004
Location: Indianapolis, IN
Posts: 28
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With the stock turbo and wastegate, the boost will always bleed off at higher rpms. The turbo runs out of steam and the WG can't hold the boost.
You may want to consider an aftermarket boost gauge as it is difficult to determine your exact boost pressure with the stock gauge.
If you are on stock chips, just keep the peak boost on south side of 1 bar. If I remember correctly, the stock peak boost in 4th should be 12.8 psi or .8 bar.
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Daniel
1988 951
APE MAF, stage II chips, LBE, test pipe, Cup wheels, H&R springs, Koni yellows.
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