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So....used E85 yet?

SnakeEyeSS

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Edelman13 Enthusiast

Edelman13

Posted
Posted

I don't see why you would, unless you convert your truck to Flex by adding the sensor, like I had done.

 

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How much did you pay for the kit?

 

 

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Rawyzf Senior Enthusiast

Rawyzf

Posted
Posted

How much did you pay for the kit?

 

 

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Here is the link to the kit: http://cjtunes.com/store/flex-fuel-conversions/14plus-gm-truckssuv-flex-fuel-conversion/

 

I bought all the OEM parts myself and had Carl (seller above for the kits) install them in my truck. He built the kit based of what he saw with my truck and built it to make it easier to install and less parts to buy.

Bowtie619 Enthusiast

Bowtie619

Posted
Posted

I'm a little confused on the whole E85 thing. Can I run E85 in a premium tune? The tune said nothing under 91....but from a bit of reading E85 is actually more in the region of 100+ octane rating. Is the name just a bit misleading in E85? Or am I just completely confused?

 

Thanks.

Rawyzf Senior Enthusiast

Rawyzf

Posted
Posted

I'm a little confused on the whole E85 thing. Can I run E85 in a premium tune? The tune said nothing under 91....but from a bit of reading E85 is actually more in the region of 100+ octane rating. Is the name just a bit misleading in E85? Or am I just completely confused?

 

Thanks.

 

E85 is higher octane that Premium, I don't know exact numbers, but I recall high 90s to low 100s.

 

If your truck was Flex Fuel to start, I would think you can run it with your tune....but i don't know that for sure. I would check with your tuner to see if he updated those tables with his tune.

alconk Enthusiast

alconk

Posted
Posted

I only use E85. $1.30 where I live but don't drive the truck everyday, it's just a toy. I have noticed a difference in power and the computer is saying avg 16.1 mpg. Don't know how accurate those are though.

camcamaro1991 Enthusiast

camcamaro1991

Posted
Posted

I'm a little confused on the whole E85 thing. Can I run E85 in a premium tune? The tune said nothing under 91....but from a bit of reading E85 is actually more in the region of 100+ octane rating. Is the name just a bit misleading in E85? Or am I just completely confused?

 

Thanks.

 

E85 is an abbreviation for an ethanol fuel blend of 85% denatured ethanol fuel and 15% gasoline or other hydrocarbon by volume. Ethanol’s true octane value range, is about 94-96 (R+M)/2

bigsapper Enthusiast

bigsapper

Posted
Posted

I'm a little confused on the whole E85 thing. Can I run E85 in a premium tune? The tune said nothing under 91....but from a bit of reading E85 is actually more in the region of 100+ octane rating. Is the name just a bit misleading in E85? Or am I just completely confused?

 

Thanks.

 

Not apples to apples. E85 does have very high knock resistance so you can crank up the timing like with 93 oct, but it will need to be a separate tune as E85 requires much more fuel due to it's reduced energy density.

 

The advantage to a truck with a sensor is that the computer will detect the amount of alcohol in the fuel and switch tables automagically. Otherwise, you will need to run a specific tune for a specific fuel.

Bowtie619 Enthusiast

Bowtie619

Posted
Posted

 

Not apples to apples. E85 does have very high knock resistance so you can crank up the timing like with 93 oct, but it will need to be a separate tune as E85 requires much more fuel due to it's reduced energy density.

 

The advantage to a truck with a sensor is that the computer will detect the amount of alcohol in the fuel and switch tables automagically. Otherwise, you will need to run a specific tune for a specific fuel.

Thanks for the info guys. I contacted hypertech and they said I could use E85 in the premium tune but if I hear any knocking I shouldn't use it anymore. Seems like a bit of a risk to try. Would the knocking be very noticeable? There are plenty of E85 stations around San Diego so I would love to use it. Plus there is a new station opening on Thursday and they're having special pricing for the first day of 85 cents. Seems like a good time to test it out. Does my tank need to be on E?

bigsapper Enthusiast

bigsapper

Posted
Posted

You don't use E85 with a gas tune. It's a separate tune in the truck's computer.

 

What truck do you have? Do you know that it's flex fuel capable?

Bowtie619 Enthusiast

Bowtie619

Posted
Posted

You don't use E85 with a gas tune. It's a separate tune in the truck's computer.

 

What truck do you have? Do you know that it's flex fuel capable?

Ya it is, I verified the number in the glove box and it has the yellow cap on it. I have a 2014 Silverado LTZ, not sure if it's standard in the 14 but mine has it.

 

As for the tune, I contacted hyperttech and he noted that I could use the "Premium tune" setting with E85...He also noted the following...

 

"You can run any octane 93 or less on our premium setting even the E85. Some have a ping on our premium setting using E85 and if that occurs use the regular setting."

 

"Very few have the ping and the ping can only cause damage over time if you hear the ping under hard acceleration. A light ping which most call engine rattle that sounds like BB’s bouncing around inside the engine is not a major concern at light throttle acceleration; if you do not hear the ping there is no concern."

Rawyzf Senior Enthusiast

Rawyzf

Posted
Posted

That email doesn't give me the warm and fuzzy. If you want to try e85, I'd first suggest putting your stock tune back on and maybe running e85 on that and see how it goes.

 

Pinging, partial throttle or WOT, no good in my opinion.

kylercochran361 Enthusiast

kylercochran361

Posted
Posted

Because I run premium gas or e85, I compare those two values to make sure there is at least a 25% gap.

 

E85 is 1.29 right now and 91 Premium is 1.89.

 

I'd run e85 full time probably, but I wanted to give my truck a few tanks of 91 to see how it drives with the tune.

 

I'll go back to e85 after 5 or 6 tanks of 91.

 

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Why are you going to put premium in your truck then drop it to E85 makes no sense.

 

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Rawyzf Senior Enthusiast

Rawyzf

Posted
Posted

Why are you going to put premium in your truck then drop it to E85 makes no sense.

 

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Makes all kinds of sense if you're setup for it. e85 is about $1.00 cheaper a gallon than premium and is higher octane.

kylercochran361 Enthusiast

kylercochran361

Posted
Posted

 

Makes all kinds of sense if you're setup for it. e85 is about $1.00 cheaper a gallon than premium and is higher octane.

Isn't the E85 a lower grade than premium?

 

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