b00stedbyFastrax

did a search, but no luck. most people run 12.0's on 9:1 - 9:5 CR. what is a safe A/F on a 10:1 CR @ 26-29 psi on C16 race gas?

PrecisionH23a

12.0:1 will be safe... your tuner may drop a tenth or two tenths of a point just to be on the safe side up to around 20psi or so. Usually when you are running an excess of 25psi you want to be a little richer... killing power with more fuel is better than killing your engine with not enough fuel. What you are going to have to pay close attention to is your ignition timing. 10.0:1 compression is not that extreme... you just have less margin for error when tuning.

b00stedbyFastrax

so @ 26-29 psi I should be okay with A/F @ 11.0-11.2.

turbodohcsi

run your standard afr, and just keep a close eye on timing.

PrecisionH23a

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b00stedbyFastrax &raquo;</TD></TR><TR><TD CLASS="quote">so @ 26-29 psi I should be okay with A/F @ 11.0-11.2.</TD></TR></TABLE>

Yep. That's pretty rich... but definetely on the safe side. I (as well as others) actually prefer to be rich when using that much boost.