E85 on gen 4
- Thread starter VNM
- Start date
01sapphirebob
Enthusiast
I wouldn't do it.
challenger&viper
Viper Owner
You need to tune your viper to use E85 and you probable know that gen4 can not be tunned.
HyperViper
Enthusiast
Why would you want to? A little less expensive and worse gas mileage 
EZ 2B Green
Enthusiast
My guess is it would run horrible if at all. It would also probably damage your fuel system. Did you mean to say E15? E85 is 85% Alcohol and only 15% Gasoline. Don't do it without the advice of SRT Engineers. What we most commonly get at the pumps today is
E10.
E10.
johniew398
Enthusiast
My 2010 GMC Sierra will run on both E85 and regular gas. It loses about 4 MPG running on E85 and I did the math. You don't save any money. Most tell you that you also have less power running E85 - I never really noticed that.
johniew398
Enthusiast
At close to $10.00 per gallon you would realize enough gain to make a real difference.
ssjcreeper
Viper Owner
We're tuning on my build as we speak. First tune is on pump 93, second tune on 109 unleaded race gas. Not sure what gains to expect from the race gas, but we're going to give it a go regardless. Just remember that you'll want to retune if you expect to see results from a modification, including an octane change.
On a side note, my buddy is in the middle of a Mustang build to support an E85 setup. From what I understand an E85 setup requires a higher flow rate which required he upgrade his fuel pump, lines, and injectors.
On a side note, my buddy is in the middle of a Mustang build to support an E85 setup. From what I understand an E85 setup requires a higher flow rate which required he upgrade his fuel pump, lines, and injectors.
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No need to run anything over 93 octane in your car. Anything higher is a waste of money.
I have the Mopar controller in mine and I mix race gas with pump gas for a 95 octane mix only when I'm tracking the car.
Lots of myths surrounding the use of E85 out there so do your own research. Bottom line is there is a huge benefit to running E85 in a forced induction engine. Less so in a normally aspirated engine unless you have increased compression and a way to fine tune spark and fuel maps.
FYI...anyone looking for race gas should go to Sunoco's website and search your area for stations that sell it at the pump. For example, I found a place in West Salem, WI that sells Sunoco 110 leaded race gas for $5.90/gallon. Hell of a deal as they were selling the 98 unleaded at the track for $10/gallon. Pays to shop around.
ssjcreeper
Viper Owner
I'm certainly not the expert on this but I'd be concerned about the effects of leaded gas on your O2s. As before though, if you're not tuning for higher octane, you're probably just wasting money. Still, I'm not sure what gains to expect even with tuning. Hoping to get my answer Monday.
I imagine if you ran straight leaded all the time it would ruin the 02's quickly although I have no experience with that nor have I heard of anyone else experiencing that. I only run it at the track and it's mixed with unleaded. When I'm done, I fill the the tank with unleaded. Never fouled an 02 in 20 years of running leaded gas in my track cars.
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