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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,612
Internet diagnostics is scetchy at best but I'll take a stab at it.
First off I don't trust gadgetty crap. Get good mechanical boost and AFR gages.
Test your waste gate cracking pressure with a mity vac. If it is sloppy put a boost controller on it and set at 0.8 bar or pony up for a TiAL.
Altitude does add a layer of complexity to the situation. An altitude compensating -160 WUR from a 3.3L 965 would be a nice addition.
It sounds like your WUR bi-metalic strip electronics are shot. One fail mode is that the engine will run extremely rich when started hot after sitting for a few minutes, such as at a gas station. It acts as if the engine is going through a cold start cycle, only it is warm. The condition clears up after a couple minutes. WCP can be all over the place as the bi-metalic strip is not behaving in a consistant manner. You can test the electronics with an ohm meter. If it is bad we can rebuild it.
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 05-28-2014, 06:46 PM
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