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In the Fires of Hell.....
Join Date: Oct 2007
Location: Phoenix, AZ
Posts: 3,779
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Dash gauge reads absolute pressure, while aftermarket is reading atmospheric pressure.
Both sound about correct.
It's a race car? Does your boost drop off at high RPM? Shimming can help with that, or if ypu are running higher than stock boost levels.
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PCA Instructor: '88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost
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