so i have a quick one... could you just out of the blue start running E85? i have heard of alot of people doing the test to see if the stuff would eat their lines and tank so on.

has anyone here just started to use it with no mods to fuel system?

 

tune-wise, NO. regarding the physical/chemical properties of your fuel system YES. AMS immersed all the Evo fuel system components in E85 for about a month and could not find any adverse effects. Regular pump petrol. based gas already has come Ethanol in it, so cars '96 and newer are designed to deal with it.

 

Your fuel system can handle E85 no problem. If your car was older with a steel tank and cork gaskets, there may be issues. So many people think that ethanol has nasty corrosive properties live methanol. It's all bogus. Ethanol is only a little more corrosive than gasoline so any car from the 1980s until now can handle it. Your stomach can too - it's moonshine!

The problem is if you have a misfire. Your fuel system will put in the wrong amount of E85 and you could have a misfire which could blow a valve or worse. The conversion kits change the on time of the injectors so the correct amount of E85 is put in. I've got the Full Flex from change2e85.com and it works great!

 

So, with an AEM or other aftermarket ECU can it detect the changes in ethanol % in your gas tank verses gasoline % and figure out exactly what octane you are running at when you have a flex fuel system, and make timing/boost changes based on what the fuel flex thing tells it? I am asking because I'm not clear on whether or not it will automatically adjust timing depending on what the flex fuel system has figured out it running in your tank... or boost. Like, if the only place you can find to fill up may be 91 can it reduce timing and boost to what would be safe on a 91 octane tune, but then later on when you fill up with E85 detect the octane rating of the mixture and advance timing and boost on its own?
edit- can it also detect octane changes when using race gas and adjust timing/boost?

 

awesome ill check it out. any part numbers i should look into for my, 03 VIII

 

AFAIK the AEM itself cannot "detect" anything about your fuel composition. GM Flex fuel vehicles use a fuel composition sensor that people are starting to use and tune accordingly. I would not doubt that it is possible to program the AEM to respond to a situation like that accordingly, however the interface between the fuel composition sensor and AEM is unclear or uncertain to me.

 

The AEM has a fuel trim that can be associated with one of its 0-5V analog inputs, so you could convert the digital output of the GM sensor to 0-5V analog the AEM can read and the AEM could adjust fuel automatically. It doesnt have an ignition trim though, and I am not sure about the boost. Could probably do something with the nitrous map

 

Another nice job, JACK!

 

But the stock ECU has a "kind" of ignition trim.. If the Octane level of the ecu could be modified to be directed by a 5 volt input then it could translate the ignition map between the low and high octane maps.

No clue how any of that could even be done btw.

 

I was just visiting the webpage again http://www.change2e85.com and they now have cold start technology which makes starting in the cold weather easier. They are also selling off the non-cold start units at a discount.

 

I JUST read about this, seems pretty sweet for a fuel setup, no one else has tried this or modified this since 9 months ago?

 

I was under the impression that you needed to use around 66% more fuel when using E85? And because of this you would need larger injectors and fuel pump otherwise you will see your injectors getting close to 100% duty cycle. Does anyone know if the stock fuel system tank/lines/seals are compatible with E-85? Currently doing this conversion on my Grand National which of course I have to run all new lines and a polyethylene fuel cell.

 

It's actually 30% more fuel by volume. Most of the answers you are looking for can be found here.