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E85 370 turbo compression.

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Old Jan 7, 2011 | 12:51 PM
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Default E85 370 turbo compression.
What is the "ideal" compression ratio for a forged 370 on E85? The turbo will be an s480 with an air to air intercooler. Motor wont see more than 20psi. I was thinking of some where around 10:1. any thoughts?
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Old Jan 7, 2011 | 12:56 PM
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I'd go 11:1
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Old Jan 7, 2011 | 12:59 PM
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FWIW I was running 10.6 static on 8psi, 24* timing, and no IC without problems. E85
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Old Jan 7, 2011 | 01:10 PM
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i should add that the heads will be 4 bolt, no oring for now.
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Old Jan 8, 2011 | 12:45 AM
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anyone else?
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Old Jan 9, 2011 | 07:56 AM
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9.25:1 here, zero issue with power, or "laziness"...
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Old Jan 9, 2011 | 09:00 AM
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I would go around 9.5. Not really much to gain by going higher. Low speed response will be good and no use going any lower with E85 and an intercooler.
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Old Jan 9, 2011 | 02:04 PM
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8.7:1 here originally designed for 91. I'd still go 8.7:1 if I redid it because it's easy to change heads to bump compression. Doesn't feel lazy at all because the turbo spools so fast.
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Old Jan 10, 2011 | 03:04 PM
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a lot of different anwsers here. i guess there is no ideal cr, everyone seems to have had success with various compression ratios.
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