[PRAY]

I am not a fuel guy at all. I have been getting question on the benefits of C85 over E85 and if I tune for it and the like. I have no answers and I know there are some smart guys on here. So lets hear what you all have to say.

[Snowblind]

https://youtu.be/fsqM9uWGqlA

Certainly I am not trying to insult your intelligence but the Racing Fuels series came out last year, I think they put out a damn good study...albeit on a boosted C7...but it helped my understanding of the different types of race fuels out there. It's like a 13 part series I think, this particular one is the e85vC85 shootout.

[PRAY]

No insults taken. Thanks for the link. I did a little research but I like starting discussions on here and like hearing first hand experience.

Some question not answered in the study I saw was is there a retune required over E? Is the stoich ratio different? Is peak power made with more timing and different WOT AFR's? Since C85 has some sort of corrosive chemicals in it, will it mess up our injectors or cause them to run lean from polymer swelling? Can it be mixed with pump gas or E85? I have a bunch more questions but those are the first that came to mind.

[Snowblind]

Yup, it didn't answer any of your questions. I can't see it making that much of a difference over e, especially a NA car. Did you notice that they were losing power on the graph until the upper band too ?!?

I guess if you are chasing every last hp available, you have to decide if the 15 to 20 dollars a gallon is worth it to you. Good luck on your info request homie.

[PRAY]

The test I saw was on a bolt on GTR and the C picked up huge at the same boost level and AFR. But they don't say how they got there. It picked up 22rw at peak and even more tq and 32rw below peak and more TQ.

http://dsportmag.com/the-tech/max-out-e85-vs-c85/

Here is the link.

[PRAY]

The other thing I don't get about the Tuner School video is that they say there are no gains above E40. I know that on my N/A builds I see right at 25rw on E70 and above and the last two times the customer didn't come prepared and we only saw E40 all we got was 15rw. I know there have been others on here that had low E content around E40 and went back later at E70 or so and saw comparable gains.

[parish8]

I could see how e40 might cure your octane needs based on your particular set up but a higher percentage of ethanol should give you more power. Same goes if your running methanol but even more power. They carry additional oxygen how couldn’t a higher ratio make more power?

[PRAY]

That's my though process. I have heard that at a certain point, above E60, you are replacing air space with fuel in the combustion chamber.

[parish8]

I don’t buy that either.

I go with it as it comes out of the pump. E70-E85. Easy and awesome. I don’t see how the c85 would be any better other than it would be perfectly consistent. It could be better for a bracket racer. If I wanted/needed more consistency I would find a place with e98 out of the pump and run that for dirt cheap.

[KingLT1]

My understanding is that C85 is just more consistent. As Parish pointed out it would be better for bracket racing where you are trying to run your dial in every pass. For most, pump Ethanol is fine.

[slick3]

I thought it was the same stuff just that each batch of C was tested to ensure its the same as the next batch and so forth. Its not as flexible as E85-E70 you get at the pump. You will Always get E85 every.single.time. That's the way I understood it...

No first hand experience just what I have read.

[Fraxum]

C/E85 is expensive to try to use boosted. Feeding the monster. But then just add a pulley or open up the waste-gates to go faster.

But NA E85 is part of a subtle performance make over for an SS.

1. E85
2. Ported Intake Manifold
3. Ported Throttle body
4. CAI
5. Tune

Here you will get a better intake and s slightly throatier exhaust sound. Power you will feel and more responsive car.

It looks stock when you take it to the dealer. The CAI is no big deal to most dealers. Then if you want to sell or trade the car, just put the stock tune in, remove and sell the CAI, and enjoy your next car. Sweet. This would be me if I had a do-over. Life is for learning.

[JFM-jr]

I watched the MS103 vs E85 video and found it interesting the E85 made alot more average horsepower with virtually the same timing used with the MS103.

[Poppacapp]

Originally Posted by KingLT1

My understanding is that C85 is just more consistent. As Parish pointed out it would be better for bracket racing where you are trying to run your dial in every pass. For most, pump Ethanol is fine.

I agree. From what I have heard C85 is just a guaranteed 85% blend vs a crap shoot % wise from the pump.