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Old 04-28-2009, 11:07 PM   #1
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Default Curious Timing Issues

I was running on the highway today tuning spark. The timing map i started with looked like this:

With ~13 deg timing @12psi in the 3k-4.5k RPM range, I would get unstable MAP readings, a little hesitation, and my knock sensor would go off if I stayed in the gas. I back timing off 3 deg in boost across that RPM range, and no improvement with anything.

Then I go the other way, and advance 2 deg from base to ~15deg @ 12psi. Now, MAP signal is much cleaner, knock sensor is quite, and the car pulls silky smooth and eagerly. WTF... I thought reducing timing would remedy knock, but this is just confusing to me. I'm not complaining... it's seems like the best of both worlds , but am I missing something?

I ended up with this timing map:

Here are two pulls:
Base timing:

Adv timing:

FYI, I'm running 94 octane Sunoco.
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