e85 vs 98

[mazdaspeed]

Hi im looking for advantages and dis advantages for running e85 fuel and some info on wat afr to tune to and can you generally run more aggresive timing???

[elutionsdesign]

Advantage, you can make more power. Disadvantage, maybe harder cold starts, difficulty finding fuel depending upon where you are geographically. Big advantage, use a flex fuel sensor, MS2 and 3 processors can accept the input and seamlessly adjust things. Yes you can run more timing, hence more power, but you'll need to find a reputable tuner with a steady state dyno to really map out the ignition timing.

Lambda is lambda regardless of the fuel type, I would suggest tuning to the same lambda values you are using for your current fuel type. Wide band sensors measure lambda and then convert that to your fuel type.

[mustanglx_1989]

I don't want to threadjack, but I'm very interested in this idea.

Would you just add 20% more fuel and leave everything else alone?

If you didn't have the sensor, would it necessary to test each batch or could you just tune it on the safe side and run with it?

Thanks,
James

[elutionsdesign]

Without the sensor you're constantly retuning the fuel requirement unless you just run straight E85, even then you'd have to retune when they switch to winter blend (E70). The flex fuel sensor makes it so much easier, worth every penny.

No you can't just add 20% everywhere and leave the rest alone.

If you want to use the fuel to make more power you have to take advantage of it either through being able to run more timing OR boost OR both. Just using it as an alternative fuel does not increase power.

[JAM]

this is true, i have a pump next to my place and it can go as low as e70 and there is a tolerance on the e85 so it can go a little higher i believe . if i do it i will mix it to e70 at all times (race application only)
I have one of these but have yet to use it...

http://www.jegs.com/i/Quick+Fuel/793/36-E85/10002/-1

http://www.quickfueltechnology.com/spec ... -tube.html

[Raymond_B]

Where are you guys mounting the Flex Fuel sensor? Is in the fuel rail preferable? I was just thinking of response time on when the fuel tables and spark start to swap/blend.

[mustanglx_1989]

http://www.ebay.com/itm/like/151318067213?lpid=82

Are these the GM ones that are being used?

James