Hey,
 
Anyone got a build to run their MR2 on e85?
 
Got a mate trying to convince me to set mine up for it.
 
Just wanted to see if anyone has given it a crack

Have a look at Rob's build thread - latest tune was 386rwkw @ 78% E85.
 
https://www.mr2australia....?m=18316&mpage=100

100 pages, wish me luck

I think E85 is fantastic, however the reduction in range is a bit of a downer for MR2's.

I think Rob has taken the correct route of going with flex fuel sensor

Yeah my mate was suggesting the flex sensor. He is currently setting it up on his wrx

I have a flex fuel setup on my turbo aw11. The improvement in response is worth it on its own.

One thing to keep in mind is it uses an extra 30% fuel for the same power. When you consider the extra power, response etc you make, you end up using 50%+ more fuel in real world driving.

Rob is running an adaptronic e1280 ecu, continental flex sensor, walbro 460lph pump, turbosmart fpr and injector dynamics injectors

I am running a motec m130 ecu, continental flex sensor, walbro 255lph pump, turbosmart fpr and bosch motorsport 950cc injectors

It is a bit involved to setup, especially if you cant do much work yourself. My car runs closed loop mixture control with a wideband sensor, as does robs i believe. To get the best possible result, it is strongly recommended.

I'm part way, got pump and flex sensor just need to suss what lines are available locally. Only a handful of E85 sources locally so flex is a must.

Thanks guys, my biggest concern is that I dont drive the mr2 much and will have to be sure to not have the ethanol sitting in the tank right ?

Yep. Very low lifetime.

E85's great if you want to make extra power on a turbo. Remember e85 doesn't make more power, it allows you to add more timing and boost in, that's where the power is.

As a few of the guys have mentioned already, I run a proper flex-fuel setup on my car, and I love it!
E85 has a much higher octane rating than gasoline, allowing significantly more boost and/or compression and/or ignition advance without knocking, therefore it allows you to tune for much more power.
 
As I run flex-fuel, I never have to stress about the availability of E85 (or lack of) in particular locations. I can run any ratio of gasoline and ethanol and the car runs perfectly no matter what. The only difference is better power and worse fuel consumption as the ethanol concentration goes up. I try to run as close as possible to 85% ethanol whenever I can, but only because it's more fun.
 
The potential for more power is very significant, but here are some of the drawbacks that come with it:
- 30-50% worse fuel consumption
- Need to upgrade various parts of the fuel system accordingly
- If you don't run flex fuel then you have to worry about availability of E85, and how close the percentage of ethanol is to what it is advertised to be in the fuel
- If you do run flex-fuel then you don't have to worry about the above point at all, but you have to pay a lot more for tuning because you have to get a tune at 0% ethanol and another tune at close to 85% ethanol (the tuning at the in-between percentages of ethanol can be interpolated, or in more advanced ECUs like mine you can set up a non-linear increase in boost and/or ignition advance as the ethanol percentage goes up)
- I've heard that it's not great to leave E85 sitting in the tank for ages, but if you run flex fuel then you can just fill up with gasoline before garaging the car for a long time, at least if it's planned