I made the plunge. I have plenty of injector, and have been meaning to try this for a long time, but I've been too busy helping other people with their stuff!








Some notes:
-Ran the car till the gas light came on on BP 92

-Left my alt-maps alone (this is my BP92/alky map which includes injector scaling, fuel, timing, and boost)

-on my base maps (normally just pump gas tune) I simply changed the injector scaling by 29% (down). Turned boost down and left timing/fuel maps alone.

-Filled car with Holiday E85 (fall blend I'm sure) for $2.19/gallon, $25.30 total for 11.5 gallons. I realize that E85 is subsidized and no I don't necessarily agree with the practices used to produce it. It's wasteful, arguably worse for the environment, etc.....but F U K it, I'm an american. We've built this nation on being wasteful and polluting! There are worse things in the world, like strippers and politicians...besides, I'm using this to kick my meth habbit.... Seriously though, I am a tinkerer, and this is an experiment for me. If we can produce this stuff for $5/gallon and be nicer on the environment and skip all the other BS, I say hell yea. I am not going to pretend for one moment that I am 'going green' by doing this. I want 105 octane at the pump, that's all

Anyways, politics aside...
-I flipped my alky kit on, which triggers my BP92/alky alt-map. WHy? Because there's gasoline left in the lines, silly! I start the car, it idles normally. I wait a few seconds, and rev the car up a bit to about 2000 rpms, and wait for the car to start to idle/run like crap. This never happens, but my fuel trims all of a sudden go way whack (I'm logging all of this). Now flip off the alt-map and drop down to my base E85 tune.

-I then drove for a while, nice and steady. (This is impossible for some people I've come to find out) and watched my fuel trims. I had it at 1008 for gasoline and started at 713 for E85...ended up raising it to 770 to bring fuel trims down to about 0%, but I still have a few gallons of gasoline in the tank (even though light was on) so I'm not gonna kill myself over this until I run the tank dry and fill up again. This is basic evo injector scaling, btw, nothing fancy.

-So now I'm roughly scaled where I want, I try going WOT and watch my wideband (this is key here, w/o this, you are gonna want to go and visit your local tuner...I highly recommend Shane @ DB Performance). My AFR's were in the high 10's, but the car feels flat.

-Turn up boost to where it was on BP92/alky map. 29psi tapering to about 23-24 at redline. Re log WOT runs, check AFR's, and proceed to dial them in.

-At this point I'm sitting thinking....the car is boosting good and AFR is nice at around 11.8:1, but it feels kinda FLAT. I contemplated it for a few moments as I checked some other stuff out, and then realized I hadn't touched timing yet So I proceeded to copy over my BP92/alky timing map to my base map section and let'er buck. Power is back, car feels awesome.

-What next? Well my goal here is to try and run more timing, and thus make more power. So I toss a few extra degrees at the car and it just takes it. Car feels AWESOME. Previously I was making 357whp and had made a best of 365whp with an extra degree or two of timing but the car would knock. Now with 3' of extra timing, the car freaking RIPS and I am PUMPED! This means two thigns:
-->E85 is an awesome fuel for boosted cars, I am able to get more power out of it than my BP92/alky map. BUT!
-->Who's to say that if I add a second alky jet to my BP92/alky tune I won't see similar results? E85 is just gas with a massive percentage of alcohol mixed in.....adding an extra alky jet (currently running a single 1.0mm/~450cc jet) would be an add a lot of octane/cooling mixture.

I'm gonna roll on E85 for a while. It's fall, I'm curious what happens when I fill up at various stations and whatnot, people always complain about their car running like **** here and there, blah blah blah. More comments to come later.

BTW, whenever I run out of E85 stations, guess what I can do? Pull up to a BP and fill up, then flip my alky kit back on, triggering my alt-map (BP92/alky) tune, then ZOOOOOM!

Thanks for reading.

 

interesting...

 

Cool..You should be able to run alot of timing advance, I know I do..What is your max timing advance at 7000?

 

Not sure at 7000, but my car makes peak power at about 6200. Before I could run about 14' there, and now I can run 16-17'. At 7k I'm sure that would be 18-19'

 

what size injectors and what IDC are you seeing.

 

FIC 1050's, 75% IDC (peak)

 

sounds like a plan..I wish e85 was as cheap over here, still 3 dollaz

 

interesting, i keep thinking about switching

 

You will find the price varies all over the place, as does the ethanol/gas mixture. If you're thinking about switching, I would recommend learning how to log and tune your car yourself first, and even installing a wideband (I have a LC-1...no gauge needed, just the wideband wired into the ecu) so you can stay on top of mixture changes. Then, use tephra v5 mapswitching hack for emergency use

 

I guess we would need 1600cc injectors for a 35r.

 

And likely a double fuel pump setup too, unless you want to just turn the boost down

 

There's a few E85 stations near my house, but it's $3.00+ a gallon. How much is regular gas by you?

 

every time i pick up e85 it comes out to around $100-$150

 

~$3.20/gallon for BP 92

 

what are your mods, Im just curious about turbo, fuel set up etc?

I have been on e85 since mid summer and love it, since I converted there have been at least 2 other cars in the area make the switch. Its really awesome stuff