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Originally Posted by mazspeed
I agree with the knob, but I do have fast burn heads. Do you think that the fast burn heads require less timing under boost? I heard that they do under N/A.
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I've never messed with fastburns and boost, but N/A they seem to work well with about 2-4 degrees less timing than a "standard" chamber 23 degree head. I would venture to guess they would also need slightly less timing under boost as well, but probably not 15 degrees low.
However, the only way to tell is to make more passes and keep a close eye on the plugs. Being non-intercooled I'd keep the AFR in the 11.7-11.8:1 range. If the AFR holds steady then add timing and make another pull then check the plugs and look for signs of detonation. If things look good, add more timing and repeat as necessary. Be sure to check ALL the plugs. When I was running my RPM Air-Gap in blowthrough I recall 2 cylinders being leaner than the others so I had to tune for those two cylinders. It was 1 on each bank that was leaner than the rest. I can't remember which unfortunately. That's where the single plane will help.
I'd be real interested to see what your EGT's are with 15 degrees of timing.
