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• Mar 15, 2016

• #2

99ECLIPSEGSXDSM

10+ Year Contributor

1,745

73

Aug 22, 2010

Erie, Pennsylvania

Both will be fine on both pump and e85. Might have a little less knock with the 8.5:1 pistons on pump gas but in all honesty, you probably won't notice a huge difference between the two.

 

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• Mar 15, 2016

• #3

ShadyDoins

15+ Year Contributor

95

36

Nov 5, 2007

Northampton, Pennsylvania

You won't really get any performance difference between the 2 except a slightly bigger tuning window on the 8.5 so that's what I would go with. Basically same as hombre above me said.

 

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• Mar 20, 2016

• #4

Rich94

10+ Year Contributor

38

5

May 31, 2012

St Paul, Minnesota

Personally I'd go with the 8.5:1, you can run a little more boost.

 

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• Mar 20, 2016

• #5

Spades

15+ Year Contributor

268

2

Apr 29, 2007

Beaumont, California

If it's daily driven, you might appreciate the better gas mileage of the 9:1

 

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