RedRiderZR1

Has anybody seen this?

https://www.advancedfueldynamics.com...-corvette-ls1/

jrp1588

Interesting, seems odd that they say it doesn't require running though.

jrp1588

Well I've been shooting some questions at this Advanced Fuel Dynamics. It sounds like their system works basically how the one I had for my Subaru did. It senses the fuel blend, and adjusts how much fuel the injectors put out accordingly. The Subaru system I had intercepted the MAF signal and adjusted how much air the ECU was seeing based on ethanol content.

This one goes the other way and intercept the signals to the individual injectors and bumps their output depending on ethanol content. It also comes with a nifty phone app that tells your current ethanol content via Bluetooth.

I'm definitely interested, but that price is pretty steep. I'm also concerned my injectors are probably at or near their limits as is. According to the build list the previous owner gave me, I've got z06 injectors which I've read are good to around 430hp. My car has aftermarket heads, cam, intake, headers, and rockers. According to him it dynoed at 460hp, but since the injectors theoretically wouldn't support that, I'm doubting that's true.

New injectors and a new tune for the injectors would probably put this mod into "not worth it" territory for me, but I definitely like it in theory.

RedRiderZR1

Interesting setup they have for sure. Been doing some reading on it myself. Seems to work from all the reading and videos I have been watching they have on their site. A good way to run E85 on our cars. Cost of this system is pricey, the only reason I don't go out there and try it. My car does have the supporting mods to plug it in ( 60# injectors, aftermarket fuel system ) and I can mess with it with HP Tuners, but not going to jump in and test it with that price point. I do like the possibilities though. Would really like to have a full E85 tune I could load into it and have some fun with it.

hodge9386

that system is pretty much useless because it does not adjust the timing which is the big benefit of running e85.

jrp1588

Yeah, I asked their rep about that. He claimed that e85 allowing for advanced timing was a misconception, and most of the power in an NA setup comes from the fuel itself. That is, of course, counter to everything I've read, but I'm far from an expert on the subject.

NSFW

People who tune their cars for E85 say it acts like race gas, which I always assumed was saying that it allows more spark advance in conditions where more advance yields more power but would cause detonation with pump gas. So now I wonder...

Are there any tuners here (DIY or pro) who have tuned for pump gas, race gas, and E85?

jrp1588

You know, at $800, and me needing bigger injectors and a tune anyway, I wonder if I wouldn't be better served by an aftermarket ECU that supports flex fuel.

hodge9386

That is completely false. They are just trying to sell it to you. There may be a slight advantage to running just e85 but most of the power comes from the timing. Hell even in a factory flex fuel tunes they increase the timing by 12-16* in some areas.

jrp1588

Yeah, seemed fishy to me as well. I could see it helping in forced induction to allow for more boost but not NA. I'd get it anyway if the kit was cheaper just for gas savings Premium is expensive here​, but I live in the corn belt. E85 is CHEAP.

NSFW

I haven't tried this but it might be interesting to those of you with good access to E85:

https://forum.efilive.com/showthread...-for-flex-fuel

NSFW

I just stumbled on the answer, here:

https://ls1tech.com/forums/pcm-diagn...-write-up.html

Apparently, the 02 Tahoe was available with flex fuel, using the same 411 PCM as some years of the C5, and that makes the conversion pretty straightforward.

jrp1588

Yeah, that's been mentioned a couple times in the thread I think. Can't seem to find anyone that's done it on a Corvette though, but I suppose it wouldn't be much different. I might look into it more seriously if I get to a point where I'm ready to get my car pro tuned.

Rkreigh

Great questions! problem is there is a huge price jump

another option that I'm interested in exploring is "dual fuel"

I can tweak the factory ecm with HP tuners and just run a dedicated computer and another set of injectors spraying pure meth insteal of the "achy control systems"

the difference is now you would have a pair of wide bands and the ability to set some really goof fail safes.

this is the approach a lot of the c7 z06 guys take because they run out of fuel.

I was looking at Haltech and other "Additional injector controllers"

they are 100% separate from the factory ecm as a "standalone" and only add fuel (so you'd still have to load another tune).

you are always running on pump gas with the factory fuel system until you go on boost and then the alchy wakes up with the standalone,

the z06 guys in c7 land are doing pretty well with this same setup!

tecreatta

I just ventured into flex fuel territory myself. I installed a device out of Finland called the eFlexFuel this last weekend. It uses a flex fuel sensor to determine ethanol content . As of right now, my tank is at 32% ethanol. I'm still testing the system out, so I can't endorse it yet. I'll try to keep everyone updated as I increase my ethanol content.

So far my C5 Vert seems happy.

Rkreigh

tell us more! I'll google it and look it up.

Have you guys heard of Boomslang

they make up wiring harnesses for various aftermarket computers and might be able to make a "pin out pigtail" for what we need that would allow swap in of the PCM to run gauges and allow a truck computer to tell a vette what to do.

puter is stoopid. they only know 1s and zeros and can be pretty easily fooled.

I agree we need a kit for this rather than to re-invent the wheel.

Seems like a pretty good solution for flex fuel and much cheaper than a aftermarket ECM

Factory tuners spend quite a bit on part throttle and transitions that can be leveraged as the base tune and bring on the good stuff when more power is needed just by filling up with E85. Crooze and start on pump gas and back timing and boost down when not on E85

Now if I can just get a GM OS with a durn wide band, I'll be happy!!
with E88, flex fuel, and a good tuner, I don't think I will need the aftermarket stuff quite as much and might be able to "do more with less"

like to hear more discussion on this and see if there is interest in nailing this down further with some vendors to offer this setup.

for boosted vettes, e85 is the secret sauce to making more power without the high cost of race gas.

poor mans octane, time to boost a muv!

tecreatta

Currently at 45% Ethanol using the eFlexFuel system. My 2002 Convertible MN6 is loving it. I'll continue to post as I increase my ethanol content.

tecreatta

I have 1000 miles on E85 using the eflexfuel. No problems. My car is daily driven.

jrp1588

You have a link to this kit? I assume it's a piggyback system similar to what has been discussed in this thread? Notice any difference in the butt dyno or normal driving?

tecreatta

https://www.ebay.com/itm/eFlexFuel-E...cAAOSw3pZa-tc8

Idle is smoother. Car seems to to have better acceleration. I'm getting 17 City & 23 Highway. I think I could average better highway mileage. I'm a little too spirited with the accelerator. I'm in Houston and E85 is everywhere. My reasons for doing this were a combination of boredom, and a dislike of OPEC.