Hi guys, some questions.

Just a mild build (p1-sc@12 psi@6000 rpm, meth/water kit, 60 lb/ inj/ walbro 255 l/hr feeding a bosch gsl392, stock bottom end and tune) wondering what I would gain in going to E85. Power level 550 rwhp@6000 rpm. Its a '98 so this is the fuel line with return.


How much power do you think Id gain running (and tuning) for E85 ?

Do I need bigger fuel lines? or is my setup (with return lines) good
enough.

Do I need more fuel pump capacity?

Do I need more injector capacity ? (I imagine I do)

I understand that I will have to adjust stoichiometric air fuel ratio as E85 requires a richer AFR for complete combustion... Is the power gain only achieved by further upping my timing when running E85 (im at 18 degrees or so by full boost? Or is there just a natural power gain from running E85 (with AFR adjusted for it of course) -even at 93 pump gas timing levels?

Do you guys that do it run a 'sensor' to sense when you have E85 in there and then adjust the tune on-the-fly?

If so, can this sensor compensate the tune for blends of both types of fuels ( ex. E85 added to a half tank of 93 pump gas? )

Any adviice is appreciated.

I live in ohio, so usually theres E85 available. (That said, I would be screwed if I was traveling the state and counted on one of the stations to have it and they ended up being 'out' of it ).....

 

from what i have seen you will gain on average a 50hp increase but it just depends on how hard you were leaning on the methanol in your tune. you will need atleast 85lbs injectors. you will need a secondary pump where that is intake or external. you will need a fuel pressure regulator and do a boost reference one. your return line should be the same as your feed or one size smaller


now for adding the sensor will tell you the content but you will have to upgrade to a different computer that will accept it. you will need to do 3 different tunes straight 93, 50/50, and a straight e85 tune.

 

I forgot to add to my post:

I am assuming that I will NOT need meth/water inj anymore If going to e85. E85 will provide enough cooling into the heads such that meth/water being evaporated into my intake (to cool the boosted air down) will not be needed

Does anyone know anything about the tune? How much more advance should I figure when under boost and running e85 ?

 

i am on e85 and still have my meth kit on the car. i am only going to be using it during the summer when it is real hot and the IAT's get above my safety level. i am by no means an expert in this. there is a bunch of people that say that it is pointless to run both as e85 is fine by itself. i like to add a little wiggle room in my stuff and not be on the raged edge

my car has 13 degrees in it. i have seen people say to stay around 16-18 depending on what the car does. i am in by no mean a tuner so somebody else is going to have to speak to that

 

I have seen cars make over 1000 rwhp with 93 octane and meth. You could get a lot more aggressive in your setup with what you have already and make more power. If you want to go e85 as an added safety measure that's completely understandable but I do not believe that you will get anymore out of your current setup that you cant already get and still be very safe. e85 is not a magical power adder. Your car is not going to just make a lot more power because of e85.

I personally am slowly buying parts for a f1r setup and I will be running e85 and meth. I am going to be shooting for 900rwhp and just want the extra safety of meth even though I am going to be on e85.

 

thanks for the replies. im learning a lot!

 

While I'm not an expert, here is what I believe to be true.

The power gain from E85 is due to it running cooler, so you can add more timing.

What is your duty cycle now? If you're at 75% or above, you should probably get more capable injectors.

Your current fuel line should be capable. Certainly wouldn't hurt to increase the size though.

You should also get a stronger fuel pump.

You're asking about a Flex-Fuel sensor. Some have successfully installed these into the C5, but I believe it requires a later model PCM, though I could be wrong.

You should not need to run meth, as the E85 runs cooler. That said, meth will cool the intake temps so the PCM won't pull as much timing when running in hotter air temps.

Best of success with your project.

My buddy has a forged bottom end 3446 with a YSi and E85. 920 to the tire at 22lbs of boost and 17* timing. It's a beast.

I'm an NA guy running E85.

 

I think vengeance or Someone did a flex fuel conversion in a C5 with a flex fuel capable pcm.

There's always the option to do a haltech elite PCM which has flex fuel capabilities and then some. That's probably your best bet if you want to have flex fuel on your C5



Good luck.

 

Most of the customers I have talked with over the years typically pick up 100rwhp or more....with E85, and an E85 tune...on boosted V8s,...typically turbocharged..and a couple centrifugal cars.