Low boost issue on Viggen - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Low boost issue on Viggen
Posted by ryane (more from ryane) on Tue, 27 Nov 2018 12:15:17
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Car: 2002 Viggen with JZW stage 4 software and supporting hardware (ETS intercooler, 3.5 bar FPR, 3" exhaust from DP all the way back). 134K miles.
I have always been able to hit 18-19 psi at WOT in my car, before and after the software upgrade. Lately I have been able to only achieve about 15 psi max, and then it starts tapering off after that as my RPM's continued to rise. Last night I checked my factory Bosch recirculating dump valve and it held vacuum on the vacuum nipple, and it held positive pressure on the charge tube side, so I don't think it is the cause.
Does anyone have any clue what may be causing this?
posted by 199.191.4...
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