it's officially rated at "over 100 octane" on all the pumps i've ever seen, but it can vary depending on the actual blend. E85 can be as low as 70% Ethanol and still be called E85.
sounds screwy, i know, but everything i've read says it averages about 105 octane, and only fluctuates a couple of numbers either way. so, as low as 103 and as high as 107.
try a half a tank in your turbocharged car, and you won't consider it "subpar"..
E85 was told to me as being 105 octane ( Marathon engineer ).
Local turbo shop is saying it is acting like 110 octane minimum on forced induction cars. And I have heard that some turbo shops are seeing the same psi and timing as C16.
so nova you are saying add a half a tark of e85 and i will notice a diffrence would i have to have 93 octane in it already? and what this all about with upgrading the fuel pump and injectors
so nova you are saying add a half a tark of e85 and i will notice a diffrence would i have to have 93 octane in it already? and what this all about with upgrading the fuel pump and injectors
i always just run it with 87 octane to save some bucks- that's still 96 octane, which is enough for what i've got.
my car actually runs pretty good on straight 93 without any noticeable detonation- but with half 87/half E85, it feels like a 50 hp kick in the ass compared to straight 93- and gets the same mileage as straight 87. i've found that if i have more than about 50% E85, the mileage generally starts to suffer.
we don't even know what andy is running. he can certainly think about it...he just shouldn't proceed with a sub-par fueling system.
a bigger concern is whether the computer will think the engine is running lean and flood the motor (in closed loop). xfi has a fuel energy constant that takes care of that; i'm not sure about the stock pcm.
i mentioned in another thread that boost referenced fuel pressure regulators could put the fuel injectors into a dangerous operating zone (at 72.5 base psig).
my '99 buick has 33# injectors (@ 43.5 psig), but only 240 bhp stock. i have lots of head room. my injectors can also tolerate 100 psig.