BurnRate/Octane/RPM/Advance

[Fred Miranda]

A while ago there was a thread about thermal barrier coatings.
One thing pointed out was that with coated pistons or combustion
chamber, timing would have to be retarded somewhat.

Does anyone have a feel for how much retard in a turbo engine?

I am working on an Eclipse 2l turbo. (7.8 comp.) with coated
pistons. It will only take 3-4 deg adv at 18psi on 92 oct.
I've done other Eclipses with similar setups and gotten away
with 18-20 deg and my 323GTX is happy with 18 or so.

Would the coating make the engine any more sensitive to intake 
charge temps?

Thanks
Fred