Compression and E85?
Thread Starter
Drifting
Joined: Sep 2008
Posts: 1,297
Likes: 30
Compression and E85?
What are some of the advantages or disadvantages of running higher compression on E85. Some shops are telling me to run 9.5:1-9.7:1 and other shops are telling me to run 10:1-10.5:1 since I'm running E85. The motor is a ERL 427CI 6 bolt block with 1/2" studs and All Pro 12-1 heads. I currently have a Paxton Novi 2200r supercharger (billet YSI). I'm probably switching to a F1x or possibly a twin turbo setup. My car is a street car so drivability is very important.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,341
From: Gilbert AZ
11:1+.
If it is not flex fuel, and never going to see pump, no reason to dick around with low compression.
Upgrading before things are done is a quick and easy way to get frustrated, never finish, and hate your car.
If it is not flex fuel, and never going to see pump, no reason to dick around with low compression.
Upgrading before things are done is a quick and easy way to get frustrated, never finish, and hate your car.
Thread Starter
Drifting
Joined: Sep 2008
Posts: 1,297
Likes: 30
Winter blend is E70. So I'll most likely go with flex fuel. I don't drive the car in the winter. I'm just worried about getting a lower octane than E85. Especially in late fall or early spring. I plan on running E85 as much as possible.
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Burning Brakes
Joined: Jan 2012
Posts: 1,145
Likes: 30
From: Orlando FL
Id say 11.1 and higher. I run 13.8:1 on E85 and boost and have for months now. I have done plenty of pulls and no problems. If it's an E85 only car personally I would go as high as possible.
-Curtis
-Curtis
Thread Starter
Drifting
Joined: Sep 2008
Posts: 1,297
Likes: 30
13.8:1? I thought only N/A cars ran that much lol. You're braver than I am.
Last edited by usmcpony; Feb 1, 2016 at 06:32 AM.
Melting Slicks
Joined: Nov 2006
Posts: 2,865
Likes: 2
From: Dallas Tx
I'm 100% on E85 and on my new motor (sleeved 388ci LSA) I went with 11.4 compression based on recommendation from friends and the builder. I have an F1X and hoping to make 1150 since I stayed with a 4 bolt block. Car also has dual nozzle meth.
Last edited by dsp300c; Feb 1, 2016 at 02:30 PM.
Drifting
Joined: Jun 2009
Posts: 1,730
Likes: 93
From: St. Petersburg Florida
I like the sounds of that build
Melting Slicks
Joined: Nov 2006
Posts: 2,865
Likes: 2
From: Dallas Tx
thanks. should have numbers soon. I could have gotten the lsx block for about the same price but I didn't want the added 120lbs or the ability to make big power 1400+. i wanted to handicap myself so i keep enjoying the car b/c most 1400+ cars get parted out or sold. i went with the CA 625 ARP head studs to hopefully hold the heads down better.