I just ordered a flashpro for my car. I have a CAI but the powertrain is otherwise stock.

I have an E85 filling station right by my work, and I was wondering--without buying injectors, can I use the flashpro to run E85, or would I need more fuel capacity than the stock injectors provide?

Getting the extra timing from the high octane just sounds very appealing. It would probably need a dyno tune using something like E70 for conservatism, but then if I or another member does it the first time, that tune could be used as a base map for others on the board to street tune with.

Assuming you can pick up around 20whp due to the octane, I'm thinking a $700 flashpro + E85@$2.XX/gallon would allow for the most WHP per dollar of any S2000 mod for NA cars. If you don't need injectors/etc.

 

With mine tuned for AF=13.1 and AF Corr = 13.9, my injector duty is at 85% at 8400 RPMs. I have tuned it to go really rich above 8400 RPMs to soften the rev limitter, so it spikes to 97% duty at 8500. I don't remember how much more E85 is required, but it seems like it is more than 15% more.

Something else I would be concerned about is the consistency of the E85 you would get at regular gas stations. I believe E85 contains "up to" 85% ethanol, but that may vary quite a bit.

I'm also totally unsure how well it would run in closed loop. Would the stock wideband sensor give correct results with E85? Is 14.7 still the correct target for closed loop?

 

[QUOTE=gernby,Mar 16 2010, 08:36 AM]With mine tuned for AF=13.1 and AF Corr = 13.9, my injector duty is at 85% at 8400 RPMs.

 

the average is about 20% more fuel, so you'd either have to lower your redline temporarily or get new injectors

 

According to my experience (2 turboed s2000s) the amoung of E85 required under high load is more than 20% over pump gas. 30% is closer in my opinion.

 

It will vary from setup to setup

 

with E85, you have to change your fuel lines as well. E85 does a number on stock rubber fuel lines. That is what I have been told.

 

That makes sense--I'd wondered if the alcohol would be damaging to whichever seals Honda chose for the car. It probably was never considered, so I'd expect it to be hit or miss, but I would hate to have the HG go early due to the alcohol corroding it away.

 

My '06 Lexus IS350 had a recall for a corrosion problem in the fuel system due to E10. I suspect that MANY older cars would have problems with it too, especially with E85. However, it seems intuitive that if a fuel system is truly safe for E10, then it would also be safe for E85. After all, it is just a difference in ratios.

 

Don't you mean Ethanol?