Quote:
Originally Posted by Junkyard Dog
On the web site FAQ, it says that the system is E85 compatible. Does that mean that you can run either gasoline or E85, like a modern Flex Fuel vehicle, or that you have to set it up to run one or the other?
Having a flex fuel Pontiac would be awesome.
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The tune has to be different, you can't just fill up with whatever you want.
The computer uses lambda from the oxygen sensor to measure stoich which is obviously different between gasoline and ethanol. 1.0 lambda is always 1.0 lambda though, so the system knows what it's needing.
For the FiTech system what you would need to do is start with whatever fuel you want and build the tune either by hand or through self learning through idle and driving operations. You then save that tune in the handheld or on a USB, reset learn and do the same thing with the other fuel.
You can then load the tunes as needed when you change fuels. It's important however (especially going from the gas tune to e85) that you have a full tank of whatever you're running, not mixed.
With that said, if you're wanting to run e85 at all, you'll want to get the Go EFI-8. The basic 600 hp configuration will only support about 420hp at max injector duty cycle. Pontiac's have fairly crappy BSFC so anything over 400 hp and you're running the system at the ragged edge. Most performance builds on these engines are in the 400-450 hp range, so you need the extra headroom.
The 1200 hp system should support about 800hp max on E85. The Bosch 041 that they provide in the inline kit will max out at about 700hp on e85 and their command center should support about 800 on corn assuming the fuel system behind it can keep up.
Plan on replacing your fuel tank. My factory '69 tank doesn't vent well enough to stop a vacuum from starving the inline pump.