I found this chart (from Holley/ Weiand) in my archives and it basically calculates your actual total C/R by adding boost pressure to your static C/R. So my biturbo is running 7.0 static and at 22 psi boost pressure the engine is running at 17.3:1 total c/r. I use 100 octane for anything over 16 psi.
Sorry for the print quality of the chart.
Marty

Click to view attachment

So when I was running 14psi on my Honda engine with 11.5:1....wow...that is scary!

hehe cool, our rally car is running 17psi on 11:1. that's almost 24:1 effective

of course, we're running 102 octane.



my built subie motor is shooting for 6psi at 9.5:1

So...

At 7.5:1 + 12# = 13.6:1 on pump gas with no audible detonation, not bad. I might have to try some 104oct and take it up to 16# just for fun.

You've got more balls than I do. That sentence sounds like a blown motor to me, but I'm probably just chicken.

Thank you....now make the header again.
The one for a turbo...

Rich

Hi Rich, did you mean these headers ??
Marty

two many cylinders.

The old kit you made for the Djet turbo setup....
I want one.

Rich

Rich, we just couldn't re-introduce THAT kit
Marty

Click to view attachment

Looks like i must be running around 14....