2015 E85

[joshc64311]

when I bought my RALLY 2 I was told it was flex fuel come to find out it has no yellow cap and no rpo code. what is needed to make it E85 capable can the dealer do this?

[Rawyzf]

I wish mine was too.

[joshc64311]

ya I thought since it was the rally 2 maybe it had a diferent cap, plus I took the d-bag for a sales man word on it

[redwngr]

For 2015's, flexfuel on the 5.3 is an extra cost option.

 

Obviously your salesman hasn't kept up with the changes.

[MikeNH]

No way to retrofit it that I'm aware of.

[bigsapper]

Actually, I think it's just adding the sensor and enabling the alcohol tables.

[jordanmf09]

I'd love to hear if anyone has actually done this through their dealer. I have a gas 5.3 and would like to make the conversion as well.

[BenzTruck300!]

its a $100 option i believe. Driving from Chicago to Florida a few months back i got 1-2mpg less on e85 than regular gas.

[jordanmf09]

I've seen that it was a $100 option when ordering the truck, but I'm curious to know if anyone has done it after the fact and how much they were able to get it done for. I'm assuming not $100.

[MikeNH]

Actually, I think it's just adding the sensor and enabling the alcohol tables.

 

Not quite. There is no sensor and hasn't been for years. GM determines ethanol content by playing with timing at startup after a refuel. E85 requires higher flow injectors, more rugged seals and maybe a higher output pump. No idea how much is "standard" on non FFV trucks.

[joshc64311]

I called gm ant talked to cs, now im waiting on a call form a service manager, I will post what he/she says.

[redwngr]

its a $100 option i believe. Driving from Chicago to Florida a few months back i got 1-2mpg less on e85 than regular gas.

Yupp

 

E85 has fewer BTU per gallon so mileage will be less.

 

It is also better at anti-knock, so they can feed higher fuel, hence provide more horsepower.

[bigsapper]

Not quite. There is no sensor and hasn't been for years. GM determines ethanol content by playing with timing at startup after a refuel. E85 requires higher flow injectors, more rugged seals and maybe a higher output pump. No idea how much is "standard" on non FFV trucks.

The sensor was re-introduced on the 2014 4.3L & 5.3L engines. What I described above is what 6.2L LT1 & L86 owners are doing to run E85.

 

Only the LT4 has larger injectors (supercharged).

[MikeNH]

Interesting. Guess I haven't been following the fifth gen engine stuff close enough.

[Higgs Boson]

all you need to do is add the sensor. there are a few places selling a kit for around $600 including the wiring and fuel line adapter, etc. after that you just enable it in the tune and make any necessary adjustments.