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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,563
Typical cold pressure target is 2.5bar as previously stated. With these aging systems I throw out the book and tune to what works best in the environment driven.
You don't necessarilly have to have an adjustable WUR to adjust the cold pressure. There is a plug over the bimetal spring that you tap down to richen. Tap too far and you have to take the WUR apart to tap back the other way. If you put the gages on you can see the change in pressure as you tap so it is not difficult if you go slow. Nothing to loose ...
Do verify your pressure before doing anything to isolate this as the problem.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 11-13-2009, 05:04 AM
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