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kenikh kenikh is offline
3 restos WIP = psycho
kenikh's Avatar
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,729
Speaking of WUR configuration, I've been spending the day with lots of little allen wrenches, WUR disk tools, and patience getting my AFRs dialed in.

As you might recall from yesterday, I was having an issue where from idle up until boost enrichment hit (4500 RPM at the time), I was running lean, at about 13.5 to 1. At the point boost enrichment hit, AFRs were pegging the gauge at 10.0. It was so rich, the motor would stumble and miss a tiny bit.

I got that low RPM condition dialed in by adjusting the warm pressure to the point where I'm now seeing AFRs around 11.8 at idle to 12.2 when the boost enrichment hits.

As advised, I continued to adjust the boost delay solenoid up the rev range until I found the point where it seemed to be crossing over. The AFRs started running back into the high 12s right around 5500 RPM, so I put a 5500 RPM pill into the delay solenoid. At 5500 RPM, the fuel does a full dump and even at 5500 RPM, my AFRs dip down to 10, but I figure that's a reasonable compromise at this point to ensure longevity and reliability. The car doesn't seem to stumble from all of that fuel at high RPM. I haven't had any luck trying to get the fuel enrichment dump leaner than low tens, and am wondering if it is even worth the effort.

I AM a bit surprised I have so much fuel in reserve at the top of the rev range.

Would love some feedback on my observations and this config.

As a side note, some advice: WOT power pulls in 2nd gear, even on an empty freeway when it's raining, when in second gear at 70 miles per hour, is not smart. For a split second, it got very exciting testing the fuel dump cutover.


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- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930
Old 10-10-2017, 01:10 PM
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