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Old 06-06-2019, 01:18 PM   #1
thelostartof
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Join Date: Jun 2002
Location: Apache Junction, AZ
Default Timing table change when going to higher CR? F vs FT Pistons

So I have gone from a FT block to a F block so my CR has just bumped from 8.7 to 9.8. Along with this I added a lighly ported 530 with larger intake and exhaust valves.

With this change what kind of advice can ya'll give on tuning down my timing map to help keep this motor in one piece. I know ideally I should throw it on a Dyno and tune it that way.

This is my timing map from when I was running it on my FT engine. So far I have been driving the car @ 9psi with this timing map without any issues. I am wanting to start turning the boost up to 14psi and get things double checked before I turn the boost all the way back to the 26psi it was running. When the car was running it used this map in 110+deg weather running 25psi without issues on the same e54 fuel that I am running now and it made pretty good power, fastest it had ever been.

The car sees only E54-E70 fuels with a gallon of 91 pump every 3rd tank to help keep things clean.


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