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 a 75/25 mix of 93 pump and Q16 
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Joined: Sat Aug 24, 2013 7:57 pm
Posts: 155
Location: Frostburg, MD

This is a "how much did I leave on the table" question. Some of you may have followed my tuning follies in the blowthrough thread. In an attempt to make this short, it seemed to be safe at 23 degrees at 8 psi on 100% 93 pump, and perhaps close to the edge of rattle at 26 degrees at 8 psi on 100% 93. [31 vs 34 base timing with -1 degree per lb curve]

Anyone have a swag on how much more timing it might have tolerated on the 75/25 mix? The Q16 gas' oxygen content did seem to lean it a bit, but I believe that it was still plenty safe on afr for the mix. It responded well going back to 34* base timing. That would have been back to 26* at 8 psi, and 21* with the 13 psi that it had on that run. I did not test beyond 8 psi with 100% 93.

AFR got into the mid 12-1s at higher rpm Edit: If the AFR looks too lean at rpm, please tell me so.


Wed Nov 12, 2014 7:50 pm
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