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Sep 17, 2009, 01:37 PM
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#1
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Drives: 03 evo, 02 lander
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Best compression for e-85?
so, im curious if there are any advantages to droping or raising the compression ratio on my e-85 build.
I am doing a full build with 86mm wiseco pistons, eagle rods, l19 head studs, main studs....etc.
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Sep 17, 2009, 01:39 PM
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#2
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also, does anyone know of a machine shop that will gas port my pistons?
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That twenty centuries of stony sleep
Were vexed to nightmare by a rocking cradle,
And what rough beast, its hour come round at last,
Slouches towards Bethlehem to be born?
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Oct 8, 2009, 01:15 PM
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#3
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Evolving Member
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Quote:
Originally Posted by maxims4g63
also, does anyone know of a machine shop that will gas port my pistons?
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Rebco Machine:
http://rebco-machine.com/Services2.cfm
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Oct 8, 2009, 03:36 PM
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#4
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Drives: Shop Cars: GT45R 6spd Supra/Bug-Eye STi/RR VIII/"Zenki" 240sx/PB Evo X SSS
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Ethanol will tolerate a lot more timing and compression compared to 93 octane. You will pick up off boost power and on boost power. We have a custom made arias 10:1 piston with super h.d. wrist pins for our E85 cars. I know you can even go higher than that. I believe English racing posted a lot of info on this topic just do a search for it. Good luck on your build!
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Oct 12, 2009, 01:18 PM
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#5
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thanks for the input. im not planning on running crazy boost, so 10:1 may give me just the right off boost response.
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That twenty centuries of stony sleep
Were vexed to nightmare by a rocking cradle,
And what rough beast, its hour come round at last,
Slouches towards Bethlehem to be born?
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Oct 12, 2009, 08:58 PM
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#6
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I'm at 10.1 with 93/e100 mix and love it, getting ready to go higher!
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Oct 12, 2009, 09:43 PM
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#7
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10:1 is a good option..thats what im going with in the future.
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Oct 15, 2009, 12:36 PM
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#8
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For E85 yea 10.1 - 10.5 is good! A friend of mine is making 714awhp on a 2g eclipse with HTA3582 at 38psi with 10.1 on E85
I made 663 breaking up with issues and 9.0a/f's on 10.1 at 35psi with E100 so yea I say it's a safe bet.
Last edited by Migsubishi; Oct 15, 2009 at 12:40 PM.
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Oct 16, 2009, 09:49 AM
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#9
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like mentioned above, expect some seriously high TQ numbers with E85, because it allows for tons and tons of timing.... and man does the TQ ever feel good.... TQ is what also breaks **** as well, so be careful.
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NEW SETUP FP Black Ported - BR 2.3 - BR stage3 head - BR double pumper - kelford 272 - map rev3 im - Exedy twin hd
OLD IVEYTUNE - 461/451 - 33psi - E85
NEW IVEYTUNE - ???????
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Oct 16, 2009, 09:51 AM
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#10
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Quote:
Originally Posted by Migsubishi
For E85 yea 10.1 - 10.5 is good! A friend of mine is making 714awhp on a 2g eclipse with HTA3582 at 38psi with 10.1 on E85
I made 663 breaking up with issues and 9.0a/f's on 10.1 at 35psi with E100 so yea I say it's a safe bet.
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lol 9.0 a/f and still producing 633whp... crazy. Doesn't higher compression also mildly assist in turbo spoolup?
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NEW SETUP FP Black Ported - BR 2.3 - BR stage3 head - BR double pumper - kelford 272 - map rev3 im - Exedy twin hd
OLD IVEYTUNE - 461/451 - 33psi - E85
NEW IVEYTUNE - ???????
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Oct 16, 2009, 10:39 AM
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#11
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Quote:
Originally Posted by tscompusa
lol 9.0 a/f and still producing 633whp... crazy. Doesn't higher compression also mildly assist in turbo spoolup?
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No it doesn't, it just provides so much more torque under the curve that it feels like your spooling fast when in fact your just making more power per psi of boost as the car rolls into positive pressure. Gives her a little more yank down low!
Last edited by Migsubishi; Oct 22, 2009 at 12:19 AM.
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Oct 21, 2009, 12:54 PM
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#12
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It doesnt help with "spool-up" but will yield with more power in the low-mid range than a 9:1 setup produces
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