Thread: e85

I dont advise blending e85 for an octane booster unless you are sure of the blends of the e85 and whatever you blend it with... When the blend changes, your fuel trims will be off again so youll have to retune every time you fill up if you live in an area that constantly is changing it.

I honestly never had a problem with my stock pump on e85(with the rewire) using 60lb injectors down to a 2.8 pulley. I run mine pretty lean compared to others though so it probably just depends what AFR youd want to run.

I'm on E85 50/lb injectors stock pump stock wiring, no issues either..

There will be many people on here with multiple ways to deal with tuning....in the end I would say tune your maf if you've made changes to the housing or have separate throttle body/maf combo.

Happy tuning

Originally Posted by 91parkave

I'm on E85 50/lb injectors stock pump stock wiring, no issues either..
There will be many people on here with multiple ways to deal with tuning....in the end I would say tune your maf if you've made changes to the housing or have separate throttle body/maf combo.
Happy tuning

What size pulley were you using?

Originally Posted by 97AutoXVette

What size pulley were you using?

V8

Originally Posted by darkhorizon

This makes no logical sense. If the fuel trims are "off" they are compensating for the different ethanol content... the fuel trims are the tuning you would do in the pcm.

True...what I don't see is why u are so against tuning the MAF..gm designed it for a stock airbox and To work with stock pulley. If you change that, with a pulley and or air intake and are seeing more g/sec at a given hz rating your maf curve is now invalid.,.so why not change it.

get 60#ers .. or be safe and go 80

For those that have switch to E85 and upgraded injectors, what specific tables did you change in the tune? Just the injector flow vs. kPa table??

Originally Posted by 97AutoXVette

For those that have switch to E85 and upgraded injectors, what specific tables did you change in the tune? Just the injector flow vs. kPa table??

And offsets and any other applicable inj data.

I see.. Does all that info usually come with injectors when they're purchased? I've never tuned for them before

Originally Posted by darkhorizon

You cant change offsets or minimum pulsewidth in any OSID that I know of. What "other data" are you referring to?

Even still, are you really THAT concerned that .1 or .2 IPW is going to throw your tune "way off"?

That being said, would you just recommend changing flow vs. kPa? I am likely going to be dropping 60#'ers in soon, and want to make sure I change what I should if it is really that simple.

Originally Posted by Reptile

When I changed over, I just did flow vs kpa, had to do a little "minor" tweaking to the table right after that and that was it.

This... When I put my 60s in I just set them for 42s and that was it. No problems in the last 3 years...

Either of you mind posting an image of your injector flow tables for the 60s? I know it's case by case, but wanted to get an idea of what I should be around.

I literally just have 42 all the way across...

............................KPA
...............0 10 20 30 40 50 60 70 80 90 100
Fuel Flow 42 42 42 42 42 42 42 42 42 42 42

not a pic but you get the idea....

For those of you running E85, what do you currently have set as your Stoich. AFR?