Can you run an e85 mix with out needing to be tuned for it? Regular pump 93 is about 10% ethanol already so if you increase it to say about 20% can this be done Safely.
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05-03-2014
Can you run an e85 mix with out needing to be tuned for it? Regular pump 93 is about 10% ethanol already so if you increase it to say about 20% can this be done Safely.
05-03-2014
Can you? probably but there wouldn be any reason to....
05-04-2014
E85 just seems like too much hassle to me
05-04-2014
pumping gas is so hard.Originally Posted by l67ss
05-04-2014
As in you have to plan routes around e85 stations. Ive seen guys miss car meets dues lack of e85 availability. No sugerwater for me thanks
05-04-2014
There life must be in ruins because they ran out of E85 stations.
05-04-2014
Been following your E85 posts Dark, thanks for keeping us posted. If I were to fill 3/4 with 93 octane premium, and 1/4 with E85, guessing my effective octane would be that much higher? (vs the 1/4 with 87 octane regular). Still think the stock injectors would be okay??
05-04-2014
I just like bein able to go on a trip and not have to plan around gas stations roflmao
05-05-2014
There are octane calculators for mixing e85 with premium. Google it. Just be careful with out a tune. Trims can only do so much. And I would rather miss a meet and have e85 then go with out. The stuff is the best thing to happen to man kind and now POET (A leading manufacturer) can make the stuff out of anything that was once green and alive.
05-05-2014
On that note, what would be recommended for me to change in my current tune to safely allows an E85 mix? Should I change target AFRs?
05-05-2014
You need to tune your MAF curve and fueling like you would for most anything. I adjusted my injector size by 30% to make it seem like they were smaller so they flowed more and then adjusted my maf curve and target afrs from there. Once your get your curve near perfect you can just set your targets. ALWAYS SCAN FOR KNOCK AND AFR.
05-05-2014
Makes sense... not to thread jack, or change the intent of this thread, but why are the MAF curves necessary to change? I have done a ton of tuning on my current setup, but have never changed the MAF curve. AFRs on the wideband show up just fine and the car is showing extremely close to the target AFRs the ECU is commanding (which I set).
Also, how do you adjust the injector size? what table is that in in the tune?
05-05-2014
When you get deeper into modding you'll have to start tuning your curve. Frankly I went from a 3.8 straight to a 3.2 and just tuned the maf. Me and frosty usually do either a wideband tune or a maf tune if no wideband is available.
We have our wideband output wired into the EGR pintel position and we log that against the target and then adjust from there.
05-05-2014
I see.. I guess one could change the commanded AFR, and/or the MAF curve and achieve the same result?? increase the MAF curve to "trick" the ECU into believing it is seeing more air than it really is to get some additional fuel?
How would you recommend changing the MAF calibration for an E85 setup or E85/regular mix? Just scale the entire curve up?
05-05-2014
No, you scale the injectors back 30% and then do a maf tune
05-05-2014
I will have to take a look at that HP Tuners thread to check out MAF tuning. No intent on rigging anything. Guess I just need to better understand what scaling back injectors really involves and how it works.
I have hoped/planned on switching over to E85 at some point all along. Been looking for a good set of used 42.5 or 60 lb injectors for the changeover. Hence why I really need to learn how to scale and tune for injector changes.
Last edited by 97AutoXVette; 05-05-2014 at 10:59 AM.
05-05-2014
What are your power goals?
05-05-2014
300whp daily driver is the hope. I figured intake/exhaust, rocker, and a good E85/pulley swapped car would be capable (including fuel system upgrades) with the tune dialed in.
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