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Old 05-09-2000, 10:52 AM   #1
Tim Prudence
Scooby Specialist
Member#: 216
Join Date: Aug 1999
Location: san diego, ca USA
Have a Nice Day? What is the sound of detonation?

I'm boosting my 99RS to 5 psi with a small turbo, no intercooler. I can hear crackling sounds coming from under the car (it seems). It sounds kind of like a lighter flicking sound only quicker. It usually only happens when I really gas it, though sometimes on deceleration. Is this the sound of detonation?

I only have a paxton rising rate regulator (still at stock pressure base), and a S-AFC. I max out the S-AFC and the sounds keep happening at the same places, doesn't seem to do much. The O2 voltage at WOT was low, about .800 when I was giving +15% with the AFC. Then I gave +30% and it went to .000 at WOT, so I'm kind of lost here...

Any advice would be appreciated.
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