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This is just a guess based on an optimized EFI ignition table I have for a low compression 911. Something in the -28 to -30 static w no vac line at hight rpm should be ok.
It might take more depending on fuel quality, AFR, and temp.
I am not very sure about this. I always thought timing for a 72 911S at 5k was in the -32 range. That is with a cam that lowers effective compression a bunch.
On my 2.8 RS MFI twin-plug running over 10/1 CR is was about -24.
Can anyone verify the 72 911T, E & S timing spec?
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