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patkeefe patkeefe is offline
one of the great unwashed
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Join Date: Apr 2004
Location: Ringwood, NJ
Posts: 2,850
I have no air to air intercooler, but I do have a neat little water injection, which is as effective as an air to air. My temps inside the airbox after the compressor run around 120F. I just have to bring a lot of distilled water to the track. I have not noticed any detonation at 6 PSI, and I think I'm at around 28 degrees total advance. It would be nice to have a boost retard on the distributor. The water has anti-detonation properties, and when it gets real hot, I can add alcohol to the water. Even at 8.5:1, my dynamic CR doesn't approach what you 930 guys have at higher boost levels with the lower static CR.

I don't have a 21st century data logger, I use my onboard AEM AFR gauge. The only gauges I can see at track speeds are that, my tach and the oil temp. I get really rich when the revs drop, say out of turn 7 and 8 (the toe and the heel), when I have to get back on the throttle hard, I drop to 10 AFR, which just kills the power.

No lap timer, but I was hanging with one of the track buds in his 951, and he told me he was running around 2:27. I love that track too, always have, since I was a kid watching the F1 races.

BTW, with Doug's original question, I checked my injectors Sunday, and didn't like the way they were squirting; a few had a nice conical mist, and some were squirting like a young boy. I have new ones coming, and will send the current ones back to Witchhunter for cleaning and testing. Maybe this will make a difference, could have been loaded up in two cylinders and made the AFR out of whack. I will follow up on the new injector results.

Do the 930's stage the fuel pumps, or are they both on all the time?

Patrick E. Keefe
78 SC
01 Boxster
Old 05-20-2008, 03:32 PM
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