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MDPorsche MDPorsche is offline
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Join Date: Sep 2016
Location: Asheville, NC
Posts: 30
930 correct boost gauge source point

What is the best place to tap for source boost for my boost pressure gauge?

I have an 86 930 running a 3.4L EFI with Garrett G35 & Tial waste gauge. I have a Andial tattle-tale 2 bar boost gauge in lieu of the clock and am running a 0.8bar Tial wastegate spring.

When I tap the boost source at the Tial the gauge works & tracks boost well BUT bounces the tattle-tale to 1.8bar on shifts. I then moved the tap point to the throttle body and solved the bounce problem but the gauge only shows boost under a hard pull and then only momentarily BUT does stop at the correct 0.8 bar.

Recommendations?
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1986 Ruf 930
2015 991 GTS-MT
2006 993 S-MT (Gone)
1969 911 T (Gone)
Old 08-04-2017, 03:41 PM
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