Bucktooth

What compression would you run.
I am going to build a 408 to run NA until i can run boost. I want to run up to 20-22 lbs of boost when all said and done. I plan on running on E80/E85. What compression would you build the motor for 9.0?

rubbersdown

iTrader: (1)

If I were building it and planning to run that much boost i would run a 8.5cr

EPP

iTrader: (22)

Turbo or supercharger? This will make a difference in what you want to have the compression ratio at. Bob

nahasapeemapetalon

iTrader: (9)

Twin turbos.

Bucktooth

Haha, we will see. Turbo though for sure. It matters?

MY99TAWS6

iTrader: (3)

9.0 would be pretty good I think especially on e85 stuff is the HOTNESS for boosted engines!! Could likely even go 9.5 on e85. 8.5 seems more for pump gas and bigger boost. I went 9.5 but don't plan on much past 15psi.

Tom@SpeedInc

iTrader: (5)

9.5:1

i'm running 10:1, great driveability

Bucktooth

You think i could run 20 lbs with E-80 with 9.5 comp ratio?

ls1290

iTrader: (20)

With the right tune and setup, sure

Bucktooth

Is that at 7lbs though?

camaroandreas

I´m running 30-35 psi with 9.8 cr with E85. No problems at all...

jason02Z

iTrader: (10)

10.5 should be good..my forged motor will be a round 10.5 or a lil more and on e85. is this going to be a street car or for racing?

BoostnTBSS

iTrader: (-1)

10.0-10.5 will be good.. but why stress on a boost level like 22 psi its just a number i will do the math for my set upi beleive it was 9.5-1 with 72 cc heads and i went with 64cc heads and spoling was not a prob just got to tune it right and take your time

Bucktooth

I just want to maximize power with boost.

Bucktooth

Really? Whats your setup???