VETTE_50_TH

iTrader: (5)

So there is a good thread on e85 timing maps. How about we see what kind of fuel people are pushing threw their cars? Also, if you know, post what kind of mpg youre getting and what turbo, boost and size injectors.

James

jid2

iTrader: (62)

Posting fuel maps is kinda pointless, because they will be wildly different depending on injector scaling, latency, MAF scaling, fuel pump set-up etc.

The thing to know about e85 and fuel maps is that it likes an AFR between about 11.8 and 12.2 based on the gas scale. Get your WOT AFR's in that range and you are good.

VETTE_50_TH

iTrader: (5)

Well, i read merlins guide on how to tune, but i dont know how to tune the whole map. Just the part that my car uses. Im unsure how to extend it to the rest of the map?

Jim in Tucson

iTrader: (3)

Here is a link to an E85 Tephra V7 BIGMAP fuel map:
https://www.evolutionm.net/forums/8186494-post2.html

And the same members timing map:
https://www.evolutionm.net/forums/8022877-post84.html

And if you are not interested in the Tephra BIGMAP, here is a normal sized E85 and timing map set:
https://www.evolutionm.net/forums/8022505-post80.html

VETTE_50_TH

iTrader: (5)

Thanks Jim. Here is my other question, and sorry for my lack of knowledge here, why is it that people say that are running a 12-12.3 AFr but there map shows 11.1 in the high rpm and higher boost? Why is that??

Or why dont most people run closed loop after dialing in their injectors?

Jim in Tucson

iTrader: (3)

The fuel map numbers are just numbers. A measurement of fuel. They may resemble an AFR, but don't let that throw you. If your wide-band says 11.5 and your target is 12.0, then simply raise (enlean) the fuel map by approx 4%. It doesn't matter if the fuel map number is 11, or 12, or 7, just raise the number by 4%. It will take some trial and error.

Tuning is partly science and partly art. Make small adjustments. Data log. Repeat.

VETTE_50_TH

iTrader: (5)

So is it just best to start out with a stock map and just go from there?

JFuego777

iTrader: (8)

I am doing the e85 switch soon, and I think I'll probably use the maps above as a baseline and tune from there...although I don't plan on running 29psi as stated in the map file name, more like 26

VETTE_50_TH

iTrader: (5)

Go big or go home. I plan on running as much as the turbo will handle, or as much as the turbo can flow without dropping.

scorke

iTrader: (18)

Honestly man don't take this the wrong way but the fact that you asked about air fuels corresponding with fuel values in the stock ecu lets me know you should get somebody who knows what they are doing to tune your car.

Scorke

VETTE_50_TH

iTrader: (5)

Well, i would rather do it myself. After reading so much the past couple days, i think i know what i need to do. Plus, what do i learn by having someone else tune my car? Nothing. I would rather learn it just like i have with everything else on my car.

tscompusa2

iTrader: (22)

if you try copying someone elses fuel map you are going to hurt your motor. I feel I can atleast point you in the right direction and make things much easier for you so im going to do so.

Below is a chopped off end of my fuel map. See how each line has its own number? this is what you want to do. You want to block off each rpm level down the line, but make sure the map still remains smooth overall. If you do this you will be able to dial in your afr with a wideband very easy. Remember to make smooth transitions though on the entire map.

tscompusa2

iTrader: (22)

bad advice. it does matter if the numbers are all 11, 12 ,13 ,14 etc. this simply indicates the global injector size scaling is WRONG therefore you are compensating for the wrong scaling with the fuel map. This is why when you see old school fuel maps from 2004 or whenever the tuners were using hex editors to edit fuel/timing maps they are all 15's and 16's and 17's etc, because at the time no one knew injector scaling existed in the ecu.

a typical good scaled fuel map will look like the one i posted above. Rarely do fuel maps ever see 12's in them at WOT area.

JFuego777

iTrader: (8)

From what I've read on here the stock IX turbo starts losing efficiency at 25-26 psi, so running "as much as the turbo will handle, or as much as the turbo can flow without dropping" would be 25-26 psi...I would guess that the car in the link is not on a stock turbo. You will still a lot of taper using 26 psi...probably be in the 20-22 psi range by redline. The turbo just can't keep up with the engine as far as flow goes. If you're "going big" as you say, have the car tuned professionally...they will make it as "big" as it can get with your mods. Tuning it yourself with no dyno might get you close, but you may as well "go home" in that case...

tscompusa2

iTrader: (22)

every car is different. a car with crappy compression will take more boost to make power and etc.