Only a few carry E85, even here in the Corn Belt. The higher octane of E85 allows us to either increase the compression ratio of an engine design, or put in more timing into the tune to raise horsepower. The availability issue for street cars precludes a higher compression ratio so that pump gas can still be used in a pinch.
On gasoline, engines run best when the air/fuel ratio is 14.7:1 (14.7 parts fuel to 1 part air). Ethanol and E85 have a lower optimum air/fuel ratio. In order the get the same power your engine will need more Ethanol (or E85) than it would gasoline, because gasoline has more energy per unit of mass than biofuels or mixtures do.
May 04, 2005 · I have built 2 VW engines with compression above 8.0:1, and both had heating issues. From personal experience, I will never again build a daily driven street VW engine above 8.0:1 compression. But just for the record my dedicated drag race engine has 11.27:1 compression running 108 octane race fuel, with over 150 passes and going strong.
According to Wusz, even given the cooling effect of E85, his recommendation would be to limit the static compression ratio to 13:1 on a 4.00-inch bore small block and slightly lower in a larger bore engine like a big block Chevy.
Jun 09, 2020 · A high compression ratio makes more power off boost, but it doesn't speed up spool by any significant amount. The car will be much more fun with low compression, smaller turbo (FP 68HTA, FP Green or similar) and 23 psi on that forged bottom end.
Those kind of compression ratios are possible for street turbos engines on ... E85 or racegas may like more. Chamber heat goes up with more comp + boost. More intercooling is required ... The very best is water injection for highest total compression, but for best power adding Methanol to the mix is even better. The charge can be intercooled ...
Dec 29, 2020 · I agreed, and soon I was driving a 2020 Nissan Altima 2.0 Platinum FWD VC-Turbo sedan, a top-of-the-line example with a base price of $35,180, and an as-tested sticker price of $38,840 – a ...