How much is too much timing with boost?
I can't speak about E85 timing. A good rule of thumb on gas is the 28 rule. Max timing 28, then subtract 1* for every pound of boost, so 14#'s of boost @ 14* is GENERALLY safe.
Launching!
Joined: Jan 2002
Posts: 299
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From: Detroit, Murder City
This is what a load bearing chassis (or engine) dyno is for. Since E85 is such a high octane fuel, knock is unlikely in most cases. This means it's entirely possible to over-spark the engine (losing power due to increased pumping loss) even if you don't get knock. The only way to tell where the "right" amount of timing is would be to take a torque/power measurement. This is best done on a dyno where you can collect this data under controlled conditions across the whole RPM range.
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With access to a Dyno, make a pass at the track or "at the track" and look at mph or time from 1 speed to another. When you stop picking up big chunks of gain, you're close to peak timing.