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RarlyL8 RarlyL8 is online now
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 14,078
By threshold I mean at what RPM do you first see positive pressure while accelerating in 4th gear. I would anticipate that to be ~2400rpm if you are seeing 1bar at 3600rpm.

Enrichment of the boost circuit on the WUR occurs ~0.4bar, however enrichment of control pressure occurs the moment positive pressure is seen by the WUR (this is the differential between the vac line signal and the ambient pressure port). If you have an AFR meter on board you should see the AFR drop in the absence of vacuum.
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 06-15-2013, 06:45 AM
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