Thread: AFRs????
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DonE DonE is offline
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Join Date: Mar 2004
Location: Brooks, GA
Posts: 1,211
I'm not sure I completely agree. First, stock ignition is anywhere between 24 and 29 degrees at redline. A stock motor with that timing and 11.5 AFR will last forever.

When I last had my engine out, and on a DTS engine dyno, the EGTs stayed constant (at one bar) between 18 and 28 degrees timing on top (about 1575 degrees). When we retarded the spark below 15 at WOT, the temps started to rise and the torque really fell off.

In addition, the EGT's really did not move up all that much (past 1575) even at 13.0 at WOT. As a result, I scrapped the idea of installing EGT probes and running the info to my ECU because I didn't think it would give me any better indication of tune compared to AFR's.

My timing is now (approx) 8 at idle (-50kpa), 36 at 2500rpm (0 kpa) and 18 at 6500 rpm (100kpa)
Old 11-20-2007, 03:18 PM
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