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Posted by: Maltese Falcon Dec 7 2009, 08:50 PM

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

Posted by: Sleepin Dec 7 2009, 09:08 PM

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

Posted by: Numbchux Dec 8 2009, 02:15 AM

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

Posted by: Zardozz Dec 9 2009, 12:21 PM

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.

Posted by: McMark Dec 9 2009, 12:50 PM

Posted by: r_towle Dec 9 2009, 04:28 PM

QUOTE(Maltese Falcon @ Dec 7 2009, 09:50 PM)

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

Posted by: Maltese Falcon Dec 9 2009, 07:06 PM

QUOTE

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

Rich

Posted by: r_towle Dec 9 2009, 07:16 PM

two many cylinders.

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

Rich

Posted by: Maltese Falcon Dec 12 2009, 11:37 AM

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

Posted by: iamchappy Dec 12 2009, 11:53 AM

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