regular gas comp ratio

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May 28, 2010 | 05:55 AM

HyperFlow

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regular gas comp ratio

Whats the highest compression ratio i can go and still use regular gas?

May 28, 2010 | 06:11 AM

Mr_ET

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From: Quebec, QC, CANADA

Re: regular gas comp ratio

like 87 regular gas or 91?

I would guess 10:1 on regular is probably the max. It all depends how hot it is in your area and how conservative the timing maps are in your ecu. Altitude will also be a factor.

May 28, 2010 | 06:30 AM

neverstop

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From: norcal

Re: regular gas comp ratio

this has been covered many times on here, its not as simple as that, browse the dyno results thread and find a build you like and then use that compression ratio

May 28, 2010 | 08:29 AM

DDTECH

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From: Baton Rouge,Louisiana

Re: regular gas comp ratio

i'm at 13.0CR daily driven, if the tune is good you shouldn't have a problem..running anything lower.

May 28, 2010 | 08:35 AM

neverstop

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From: norcal

Re: regular gas comp ratio

I daily drive with ~12.0 compression ratio, definately need to get it tuned by a pro though or motor won't last long. I think consensus is that anywhere in the 11.8-12.5 range is fine for pump gas