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11-13-2020 #1
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- Dec 2011
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- new york
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Forced induction and compression ratio
How do you figure out what compression to run with a power adder? Now that winter is moving in on us, it's time to take a good running complete car and tear it apart. I want to build a reliable l76 turbo engine. Not looking to make all of the power, but looking for another 200-250 who more. Planning on doing rods and pistons with hooker turbo manifolds.
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11-13-2020 #2
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- Mar 2020
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- 200
With EFI, 9.5:1 is a reasonable compression ratio. You can reliably get to approx 550rwhp on pump fuel on a LS1/2 before you get into rod/piston reliability issues.
Upgrade pistons/rods & you can make 8-900 wheel on pump fuel.
If you use E85, then 10:1 or higher will net more power.
At 9:1 & lower you sacrifice significant part throttle torque, but can make up for the the power loss with more boost but at the loss of cruise drive-ability/throttle response.
I stick with 9.5:1 or higher.
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11-17-2020 #3
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- Dec 2011
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- new york
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Thank you
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11-17-2020 #4
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- Aug 2004
- Location
- Red Deer, Alberta, Canada
- Posts
- 1,364
9.5-9.8:1 on pump fuel including e85( I say this because its not pump gas in every region).
Keep the turbo setup intercooled regardless of fuel.
Matt
72 Chevelle 370ci, 76mm single turbo, TKX, Speedtech Track Time, Millerbuilt Strange full floater 9", Brembo brakes, BC Forged 18x11s with 315s square
Instagram: Cst_koon
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