Getting the most out of E85 - How much better is custom vs OTS

[Yoshoobaroo]

Originally Posted by Jaden

It cost me $150 to go flex fuel and it's definitely worth it to not have to worry about flashing back and forth...

Jaden

p.s. There is no reason to spend $2000 on a flex fuel kit and tune. Especially if you already have an OFT. If you need help, let me know. I can get you a fuel analyzer and tell you everything you need for the most bang for your buck.

Where's this $150 flexfuel kit?

[coxxoc]

Originally Posted by Jaden

Why couldn't you just make a summer tune for better than e60? Also, it has been explained that there REALLY isn't any real gains to be had over e60.

The amount of additional timing you can run is negligible.

Jaden

I could. If the user is fine with flashing the ECU every time they change fuel types that is fine. I didn't carry around an ethanol tester, however. Once I spent the money on the flex fuel kit/ethanol content analyzer going the rest of the way to a flex fuel tune wasn't that much.

What do you know, it is May when we should have class 1 E85 in AR. Its still class 3 here. 66% ethanol (as measured by the ECA) instead of the 80%+ it should be. Its a safer decision to let the map adjust based on ethanol content rather than switch maps due to time of year and hope for the best. Hopefully this clears up why I never advanced timing for more than E60 before.

Regarding timing advance. I'll be adding a turbo in the next 12 months. E60 vs E85 timing matters with boost.

[Xxyion]

Originally Posted by Bkdshadow

I’m pretty sure @Xxyion had an OFT OTS E85 tune originally, but then switched to the Delicious E85 flex fuel tune. Maybe he can chime in on this.

I had the OFT but never ran E85 as at the time I had no access to it. @MYKey and @mrpikachufrs both use the OFT with the E85 tune. I’ve driven one before and personally I found the custom flexfuel tune to be significantly superior both in throttle response and power delivery.


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[Jaden]

Originally Posted by Yoshoobaroo

Where's this $150 flexfuel kit?

It's called ability and ingenuity....

I bought a flex sensor and fuel lines on ebay for $89...

Then I bought an arduino nano and display for $12, and $6 respectively. Then I coded said arduino to convert the frequency output of the flex sensor to voltage output and ethanol content percentage display, I got a visconti pnp harness for $45 also on ebay and I got the flex tune from Shiv.

I offered to give anyone who wanted my fuel content code. I am also willing to send programmed and soldered/shrink wrapped(requires a couple of resistors) and boxed arduinos with instruction on how to wire them up to the car for $90 bucks...

Jaden

p.s. even if you were to buy everything brand new, it shouldn't cost much over $200... and you could do it for as little as a hundred with the right deals and going directly into your own harness...

[paintdude258]

Definitely some ingenuity there, mad props my friend!

Although enticing, I will spend the money for peace of mind rather than saving the money! Thank you for the write up, a great find for the DIY’r!

Originally Posted by Jaden

It's called ability and ingenuity....

I bought a flex sensor and fuel lines on ebay for $89...

Then I bought an arduino nano and display for $12, and $6 respectively. Then I coded said arduino to convert the frequency output of the flex sensor to voltage output and ethanol content percentage display, I got a visconti pnp harness for $45 also on ebay and I got the flex tune from Shiv.

I offered to give anyone who wanted my fuel content code. I am also willing to send programmed and soldered/shrink wrapped(requires a couple of resistors) and boxed arduinos with instruction on how to wire them up for $90 bucks...

Jaden

p.s. even if you were to buy everything brand new, it shouldn't cost much over $200... and you could do it for as little as a hundred with the right deals and going directly into your own harness...

[paintdude258]

YOU ARE THE MAN! This was exactly the answer I was looking for! I have run Shiv’a custom 93 tune and his OTS tune.... the custom tune is night and day better!

Originally Posted by Xxyion

I had the OFT but never ran E85 as at the time I had no access to it. @MYKey and @mrpikachufrs both use the OFT with the E85 tune. I’ve driven one before and personally I found the custom flexfuel tune to be significantly superior both in throttle response and power delivery.


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