Quote:
Originally Posted by NoDOHC
Update:
I learned that my gut feeling for ignition timing was not accurate as I started with 62 degrees BTDC at 9,000 with 13.8:1 AFR (gave 169 WHP at 8200).
Retarding the timing to 52 degrees BTDC at 9,000 gave me 182 WHP at 7100 rpm
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It's also really -really- far advanced from what I've heard of anyone running, even up at the redline. If you got 13WHP from retarding 10 degrees, I'd say you're way advanced. On an NA 13b, while on an engine dyno, I've never had to advance past 40, and that was a motor that was already on the down-slope of the VE curve. I seem to make pretty good power on most port configurations around 30+/-5 degrees BTDC.
Something to remember is that as you increase airflow to the chamber, you need less spark advance, not more. Retard your timing out towards the stock numbers, and you probably will hit 200whp
07-28-2009, 08:49 AM
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