[Tom Vaught]

Originally Posted by JLMounce

Really depends on the power you're trying to make. A good starting point is to look at your power potential, then up-size your fuel system by 30% to accommodate the added fuel requirements.

What's the engine build look like? E85 itself has less btu that gasoline, so simply using it in an engine that could otherwise be fed gasoline doesn't typically have much advantage to it. Where you start to see an advantage in power production is when the engine's compression ratios are raised to take advantage of the better cooling properties of ethenol as well as it's higher knock tolerance.


If this car isn't going to be driven regularly, e85 is probably not the best option because of its hydroscopic nature. That's when you really see issues crop up, especially if the car is going to be sitting for a month at a time with a half full tank and why you specifically want stainless steel here.

The other consideration here is fuel quality at the pump. While it's called e85, the governmental standard is a minimum of 79% of the standard for denatured ethanol in the fuel. That means that when you fill up at the pump, you could be pumping as low as E67 or even higher than E85. My research indicates that most areas that have plentiful supply and demand will have fairly consistent ethanol percentages between 70% to 85% depending on the season. You'll see e70 in the winter and e85 in the summer and depending on demand will have some of that mixing together during periods where the mix is changing seasonally. You may wish to go test several fuel stations before making this switch to see how much actual ethanol content is in the fuel.

Do not know why everyone recommends the 400 L pump even with e-85 when the manufacturer even says it is not compatible with e-85.
Only the 450 pump is compatible of the two pumps.

From the manufacturer:
The Walbro 400 liter per hour (LPH) fuel pump is the ultimate solution for the high power NSX. ... The 450 liter per hour (LPH) E85 compliant fuel pump is compatible with either gasoline or E85 and offers a slight flow increase.

Tom V.