I decided to demo one of the E-85 flex fuel modules in my a4. Seems to work well, and there is a slight horsepower boost. What do you all think? Gas mileage doesn't seem to suffer very much like some say. I will have to clean my fuel filter in about 500 miles but since my car has 140k on it, i figure it's due anyway. Also, I just did my first Audi timing belt job, yay!

 

details details! which year A4? what else did you have to change?

 

It's an early 99 A4 1.8TQM Avant. The only change was that I had to remove the engine cover to allow space for the plugs. The module basically has 4 bridges that connect to the injector plugs and run the signal through the E85 module then back out to the injectors. It's plug and play. I guess it changes the pulse of the injector or something. Inside the module are some DIP switches that allow you to fine tune the system but it comes set at the most efficient and lowest setting. It's a flex fuel deal so you can use any combination of E85 and regular gas as long as you use some E85 in the tank. If not you have to run the beginning 50/50 mix tank to calibrate the module. All gauges reading same as before change and power is more peppy. We'll see how it does over time. I only have about 160 miles on it so far (gauge still above 1/2 tank!) and haven't tried a full tank of E85 yet. Ran OBDII scan on it and nothing so far. Started right up and continues to even during Colorado's cold snowy mornings. Here's the website for the company although I got mine from my cousin who owns a full service shop. http://www.fullflexint.com/
Hope that clears it up a little. I'm just demoing it and wanted to give my feed back to the community here. Sorry I haven't posted too often and forget that people don't know my car a at all! Take care! BM

 

i thought that you would have to change fuel line hoses because the ethanol can eat away at the rubber. seems cool, i wish NYC had E85!

 

ahh forget it, i was reading through that website and it states that cars made after 1990 should have fuel lines made of neoprene, which is not reactive to ethanol. just to be sure does anyone know for sure if your fuel lines are in fact neoprene? i would most likely guess yess

 

Wow, that is awsome! I lived in the midwest and I defintly support E85. At my school there are tons of parking spot reserved for flex fuel car thus making me want one. However, according to Consumer Report's used car guide of 2007 they did a study on flex fuel and said it is worse in term of making power thus causing more energy use and cost?