J0HNNYG85

Is there any possible way I can get my fuel management system for me to run both pump gas and e85. Or if I wanted to just run e85 I can only do that? Because. I was thinking about bigger injectors and running e85 but the closest place is a 45 minute drive unfortunatly. Thanks

Chevycobaltss3

iTrader: (2)

only way to do this safely is to have two seperat tanks lol. truly, if you have e85 and are tuned for it then all of a sudden you put your tune for gasoline in along with say 93 octane you have to be sure to have no e85 in the tank

J0HNNYG85

i know thats the part that sucks i dont want to be stuck with e85 all the time :/

Chevycobaltss3

iTrader: (2)

you cant just switch when you want if you want the cooling effect and the octane rating just get meth

CanadianCobalt

iTrader: (5)

If your tank was on really empty why would it matter?

Joel

Chevycobaltss3

iTrader: (2)

Think if a tank is on empty, the car will still have fuems, and it will still have e in it because the pump cant get everything.

CanadianCobalt

iTrader: (5)

I know that, I'm just curious as to why it would be that big of an issue if it was 85% gas and 15% ethanol left (which would still be a fair bit in the tank). Flexfuel vehicles can do it, wouldn't it be similar to having that with a dual tune?

I'm not sure on the properties of E vs Gasonline besides octane and burning cooler, trying to learn haha.

Joel

SuckMyBalts

iTrader: (-1)

There is a reason we have fuel trims on our cars. The ecu will compensate and add or subtract fuel if there is a little extra E in the car.

Op what you will need is 80lb injectors and hptuners. You can run your 93 pump gas tune all you want, when you fill up with e85 switch your tunes and dial everything in. When you need to get back on pump gas 93 then simply run her to empty as empty as you can, or drain the tank, and then fill up with 93 and swap your tunes back. After running a few tanks through your car will be fine.

Having a little e85 in when you fill up with 93 isn't going to hurt anything, your car will just be slightly off but the ecu will compensate for it.

Chevycobaltss3

iTrader: (2)

flexfuel vehicles sense the e85 or the mixed fuel. it has the octane reader... The issue is e85 takes more to be stoich then gasoline. so it would be burning hot if it was 85% gas and 15 % e85

phatnackySS

Iv aways thought of getting the alcohol sensor form a flex fuel cobalt or hhr and a flex fuel ecm and tuning the ecm for the LSJ...but i don't know of any support for flex fuel cars.

The other option is standalone , Megasquirt is playing with flex flue capability.
Flex Fuel with MegaSquirt

I'm building a escort GT turbo that will be run on megasquirt ,and i think i may test this on that car and familiarize myself with megasquirt, once i get it down id like to MS the SS ,but its going to be more complicated due to the fact the ecm dose more than control the engine ,so it would have to be kinda a piggyback type set-up.

Chevycobaltss3

iTrader: (2)

suckmyballs...... Do you tune, if so you need to quit because you are a terrible person to even think the ecu can compensate lol. fuel trims are driven from the metering system, are car cant change fuel trims because of fuel, it changes them from mettering air coming in using the map sensors and the maf sensors. So with your comment you wrote you are basically stating that the car senses 87 octane, 93 octane and itll compensate stoich afr ratio, to a partial afr with e85 which would prob be around 13.5 to be stoich. The car is made to run a stoich of 14.669 which is gasoline stoich, so if you did run e in the car without tuning for it you will be running hotter and u could blow the engine..

so if you dont understand what i wrote please do not put things in peoples heads. if you do i hope you learned somthin

Chevycobaltss3

iTrader: (2)

ive used mega squirt, and i do like it alot. I used it on a talon, 4g63 with the s20g and race gas. TUNED IT CONSERVATIVE AND MADE 550ISH WHP Mega squirt i think is new person freindly

phatnackySS

Iv been reading up alot on it , its seems pretty boss , idk why more people dont use it.

Omnigear

iTrader: (4)

dont belive them , do eat ^_^ show em whats up.

xnigelx

iTrader: (1)

get a backup pcm? lol
one for e and one for gas

SuckMyBalts

iTrader: (-1)

You aren't understanding what I was saying. I am simply saying that a little e85 in a tank of 91-93 isn't going to put the tune that far off and vice versa. You will still be safe to drive until you run a few tanks through and everything levels off. I wasn't trying to say you can drive with e85 on a 91 tune or vice versa, but with just a bit left in the tank you are fine as I have done it many times. Hell you can fill it up at a quarter tank and as long as you re-dial the maf you will be fine.

Chevycobaltss3

iTrader: (2)

You r correct meaning you might be fine, but you wont be safe thats all i am saying if he wants to drive with it like that then all is well. but me as a tuner know consequences of actions takin like so.

SuckMyBalts

iTrader: (-1)

if you have 11 gallons of 93 and 1/2 gallon of e85 your wot afr will not be that drastically off

I am not a tuner by any means but I speak from personal experience with e85 and 91/93. You can still have some in the tank without drastically changing your afr.

Obviously the more you have in it the more it will be off. Most 93 cars run 10% ethanol anyway so running a slightly higher ethanol blend will only help with detonation resistance but could lead to slight richness yes, which generally is a good thing when its SLIGHT

cakeeater

Ethanol is more resistant to pre-ignition than gasoline, so having a little e85 left in the tank will have no negative effects whatsoever besides a TINY bit less performance. If you have 1/2 gallon if e85 left in your tank and you have a 12 gallon tank (don't know what you guys have. . . ), only 3.5% of the fuel is ethanol unless your station runs 10% ethanol, then it will be just a slightly higher content of ethanol. You'll have no issues.

insylem

Isn't regular pump gas, even premium 93 Octain now 10% Ethonal anyway?
I always see the lil sticker saying 10% Ethonal at the pumps when I fill up.
Cant get around it might as well tune for it.