Would you think i would Benefit from E85 with the amount of compression im running? Mods are in my sig.

 

The reason i would want to run it is price. e85 is very cheap around here being a farming community. Plus we have invested in ethanol plants so why not, right?

I have been running e85 in a ton of different things. Build a lot of race engines for locals as a side job. My personal one is 15:1 which i run on e85. (we are also at a higher altitude so get away with more compression) It is great because i get the advantages of running high compression yet i can go fill up at the pump for $2/gallon. Can't beat that!

Plus in the summer time it runs so much cooler that i don't even run radiator fans. The down side is the tuning for cold starting is different. I don't run these engines during winter so it doesn't matter, but they do not like to start up cold.

btw, stoich of 14.7 is the same for all fuels on a gas scale. It is actual a lambda of 1 they just scale it different for different fuels. Thus the o2's still try and tune the motor to 14.7:1 like they would on gas. Then when in PE mode you would be getting the 30% additional fuel from the injectors... Also all fuel lines are rated for ethanol. Reason being is gas already has ethanol in it, so they have to be resistant already, so any newer efi car is capable to handle ethanol.

I just wasn't sure if anyone has done this and what the outcome is. If it was me i would tune for it, but my dad doesn't want to do that. Just wants a quick easy fix.

 

What kind of ball park static compression ratio and dynamic compression ratio can be run on E85?

 

I know that all gas has some ethanol content in it already. From what I researched the higher ethanol content of E85 will eat up rubber lines over the long run. I also got a 98% on my paper too lol.

 

So was the verdict that we could increase injector size 30% ( 30-40% ) and run E85 in the system without having to change the base tune?

The fact was that O2 sensors read lambda which they will display a value of 1.0.

Fuel ........................ AFRst ........ FARst ....... Equivalence Ratio ... Lambda
Gas stoich ................ 14.7 .......... 0.068 ................ 1 ................... 1
Gas max power rich .... 12.5 .......... 0.08 ................. 1.176 .............. 0.8503
Gas max power lean .... 13.23 ........ 0.0755 .............. 1.111 ............. 0.900
E85 stoich .................. 9.765 ....... 0.10235 ............ 1 ................... 1
E85 max power rich ...... 6.975 ....... 0.1434 .............. 1.40 ............... 0.7143
E85 max power lean ..... 8.4687 ...... 0.118 ............... 1.153 .............. 0.8673
E100 stoich ................ 9.0078 ...... 0.111 ............... 1 .................... 1
E100 max power rich .... 6.429 ........ 0.155 .............. 1.4 .................. 0.714
E100 max power lean .... 7.8 .... ...... 0.128 .............. 1.15 ................ 0.870

 

E85 has to be 30% less expensive for it to make sense, and I have never seen it be. And that is just the break even point, you’d still be going through the hassle of refueling more often.

E85 is not corrosive. The water it absorbs is when the alcohol evaporates and leaves the water behind.

E85 will dissolve fiberglass fuel tanks (boats).

 

in my area its a little over 40% cheaper than 93 octane. Itll let me run boost with no timing retard a cooler running engine and have little to no chance of detonation.

 

All in for E85 if you are pressurized intake.

 

My truck has stock ethanol tables and at highway speeds gets 18% lower mileage compared with gasoline. The worst of city driving is 24%, the overall average is 21%.

Every locale is different with regards to price and availability. If I'm racing and don't need the range, it goes on E85. Saves about $20 per tank of fuel compared to gasoline when the price is right.