carlrx7

I see a lot of shops with cars and engine dynos, customized tunes, developing cams, heads and exhaust. Nobody has posted any results from simply swapping to the Vitamin E!

POST EM UP!



-Carl

walhan_qtr

do you think it will be worth anything? I am welling to do it but I figured with 11.5 compression it wont be worth much... I know its a different game but I guess no one will know until they try it lol

carlrx7

I honestly it will be able to unlock another 20-30hp above a tuned LT1 on 93.

I read a 14' silverado on e85 didn't pick up much hp but it dropped big time off the 1/4 and big mph.

walhan_qtr

hmmmm you make me want to try it.......... I might. one thing that worries me thought is tuning. the DI is new for a lot of LS tuners and I don't really want to risk my brand new car for tuners to learn on it haha. I will think about it and see... I know few guys that worked on DI on Bimmers and other cars so might hit them up to see if they feel comfortable tuning this thing...

carlrx7

I would lean towards the v6 Camaro and silverado tuners.

EdwardETraylorIII

With the timing advance alone it would be worth 20 RWHP.

I can't wait for the Z06 option.... And a couple of turbos... and some forged parts.... and E 85!

ole

regorih

You really need to read up on E85. It loves compression and making power.

walhan_qtr

I have been running E85 on my 07 Z06 for ~4 years now and other cars. I am just concerned about the tuning aspects with the DI. The other thing is compression. I am just saying that the compression is not too high to see a lot of gains with E85. will there be any going with E85? sure, but is it worth it? thats what we need to figure out I remember doing this on stock Z06s with a little more compression than stock and the gains were only about 8whp/8wtq! so I am wondering if its worth it to do it.......

Supermassive

E85 will give a small performance boost in non FI applications due to the compression but will really shine in FI applications where more boost is needed. I'm gonna go out on a limb and say that 12-15 PSI will be the max pressure that boost applications will be able to run safely. I'm only coming to this due to the fact that I run a 12.5:1 compression ratio in my FR-S and pump gas is only good to about 12 PSI before you start getting early detonation...and yes I have DI. With E85 there have been examples of my engine making 450+ WHP with 21-22 PSI with no internal modification. Of course you put a shitload of strain on an engine that only makes 160 WHP stock. The case of small performance gains for E85 on a naturally aspirated engine is due to the average gain on E85 that I've seen on DI engines. The FA20 (from the BRZ/FR-S) makes about 170-180 WHP on E85 with a better bottom end torque curve, which is 10-20 WHP just going with the corn juice. So if we go by law of percentages thats a 6-12% gain...I know it's a large spread but lets talk worst/best case scenarios here. An LT1 putting down 400WHP will see a gain of anywhere between 24-48 WHP. Of course this is speculation and will likely be inaccurate but hey that's not too shabby.

The problems rise with availability of E85 and the likely need for the ability to switch maps on the fly, or even get a full flex fuel setup...which isn't cheap. I was going to do flex fuel for my FR-S but the cost was pretty high and the benefit was moderate for the hassle of the whole thing. That said, I may just try for flex fuel on my C7 when I get it just because I have E85 readily available (have a station right by my house) and I also intend to go with a SC some day. Also E85 is cheap compared to gasoline right now. 2.85 gallon for E85 and 3.50+ for 91 octane.

VIN666

I have an e85 small block, 1st gen though.
Chose e85 to be able to run 13.5:1 compression on cast iron heads in my sleeper.
Works great, but it's a hassle, for more than one reason.
Fuel economy is abysmal, availability is worse than gas (but still better than race gas, at least in MI) and e85 is pretty aggressive for various gaskets etc.
That's not all unfortunately. E85 also leaves a gummy residue behind (I'm told due to sugar) and if parked for a long time, the evaporating gas leaves crystals behind, that in my case, clog up the carburetor.
So, would I do e85 on an NA application again? NO, especially if the engine is stock and has less than 15:1 comp on aluminum heads.
On a boosted car on the other hand, it's magic juice. Definitely a go.

regorih

I see what you mean.

Ligenfelter saw good gains on their 2014 Silverado mule testing pump 93 vs. E85

johnglenntwo

http://gmauthority.com/blog/2013/07/...no-with-video/

(The C7's tires were too small?)

mowton

Was it retuned for E85? If not the fuel trims will be close to +20% to maintain the new lambda 1 value and when it entered wide open throttle (Power Enrichment) the PCM would add this fueling to the PE value making it rich.

Ed M

SCM_Crash

I would be interested in some results. There's an E85 station right near my office. A dual map would be great.

mowton

Any updates

walhan_qtr

I haven't done it on my car and doubt I will. just worried about it all. not sure how the pump will like the E85 same with injectors ...etc probably be fine but I will let someone else figure that out before me!

SCM_Crash

The pump is no different from the flex-fuel vehicles already being used. They didn't create an all-new pump just for the C7. Maybe a different pump housing, but even that will be fine. The C7's architecture was originally designed with E85 in mind.

Injectors are also good to go. Same injectors that are in the Gen V trucks.

walhan_qtr

ok ok I will give it a try this week... Geez you guys are good LOL

right now my car put down 414whp/414wtq Stock. 420whp/420wtq with a tune only 91oct (I know people are getting 430whp but mine would knock!! tried different approaches, leaner with more timing, leaner with less timing, richer with timing and no timing, still all net the same numbers, 420-421whp) I also have a little problem where throttle will not open all the way below 3000rpm (only 80% as soon as it hits 3000 it will go 100%, we didn't figure that out yet!)

SCM_Crash

Don't run it without a tune!

The C7, from my understanding, doesn't have a tune for E85 built into the ECM. The hardware is apparently all there. But the tune is not.