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Hmm… looking for input on this one.
I was having issues with my 930 turbo-swapped, modified 1988 911 running inconsistently earlier this year and upon finding my system and control pressures were off I disassembled, cleaned, and reassembled my WUR. I reset the pin height to get my pressure just barely in spec. I broke a fuel line in the process and the car sat a lot of the summer unfortunately. Now months later I am getting different pressure readings that are out of spec.
This is a 153 WUR with a WCP that should be 3.55-3.95 and system pressure othat should be 6.7-7.4. Current CCP at 18C should be 1.9-2.3.
I am currently getting CCP of 1.5 (low) and WCP of 4.1 (high). System pressure is 6.9 so that one is ok.
I understand how to adjust pressure via the pin, but what to do if one is low and the other is high?
Edit: update: took the car out late last night —
cold start up AFR: 12
warm idle AFR: 13.2
cruising AFR: 13.2
10 psi boost AFR: 10.5
This is with warm control pressure at 4 bar (but cold at 1.5 which is low).
The questions I’m left with:
1) does adjusting WUR pin change AFR everywhere, or just in certain areas?
2) does adjusting the AFM screw change AFT everywhere, or just in certain areas?
…any recommendations on adjustments I should make?
Last edited by Phony930; 10-24-2025 at 08:35 AM..
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