so now that the new motor is almost broken in, the time has come to make the switch to e85. since i have never used the stuff before, i had some questions on tuning e85. first off, i am using an aem o2 sensor and aem ems running aem pro. now i think this is how i am supposed to set up everything to tune for e85, please correct me if im wrong. first i go in to aem pro and go to configure>units>afr units, and set to ethanol?

assuming that i set everything up correctly my next question is this. how will the afr read on the gauge when im tuning? it only reads down to 10, and i know that a wot true afr for e85 should be lower than 10. will the gauge convert the true e85 afr to read as though a stoich gas afr,(i.e. cruse 14.7, wot 11.5 would be target afrs for the gauge reading)?

please help get me spun up on this guys.

 

Dont mess with changing the units in AEM. Just leave it on a gas scale, thats what I do, or use lambda. That way the readings in AEM/datalogs match what you see on the gauge. I have my cruise setup around 15.5:1 in low vac, coming up to 14.7:1 at 0 psi. I also run several degrees more timing in low load, it helps ALOT with fuel economy. Basically I went from getting like 20mpg with 14.7:1 afr and normal 35deg advance to almost 25mpg with 15.5:1 and 44deg advance at low load.

As for wot, I tend to stick closer to 12:1 afr (on gas scale) - e85 has alot more fudge factor for running lean (I actually had a fuel pump turn off and ran 14:1 under full boost once). E85 does not like to be run too rich, itll breakup BAD. Put in too much fuel and youll get on it and think you blew the damn thing up haha. Go much past 11:1 and youll run into issues (not that it will necessarily hurt anything, itll just run like crap)

Big thing with E85 is you have to be careful with timing, yes you can run more timing, but if you cross the line and run too much timing it tends to be less forgiving. Ive also seen ALOT of cars hit MBT before they see knock. As for timing curve, timing near peak torque will be close to the same it is on pump gas, but when you start approaching redline youll want to run quite a bit more timing (sometimes even 5-6* more).

Ive been running E85 in the tC for over 2 years now, and have tuned several other E85 cars, if you want any more info, pm me and Ill give you my phone #.

 

life saver bro. shoot me a pm with your # and i'll give you a ring if i hit any snags.

 

yes keep it on the gasoline scale.

you can run a bit leaner during cruise but you will probably find more power running a bit richer during WOT.

you are going to be able to throw a little bit more timing at it but not a whole lot.

You are going to need A LOT of fuel. ID1000s will get you to 500-520.

 

QFT - forgot about putting in that part. Im running 1300's with 60psi base pressure + 1:1 and im maxing them out (85-90% idc) around 29psi. Still havent dynod on that much boost, but assuming around 600whp, itll be on a dyno soon

 

My 1000s are on an 80 base.

 

yep, that was pretty simple. going with a 60 psi base pressure on fic 900cc injectors. tuned it to 11 psi creeping to about 12.5. made about 350whp 330tq, and i didnt even touch the timing yet. still have to get some heat range 8 plugs, and my motul 300v chrono 15w50 should be here on monday. thanks for the quick help guys.

 

Good numbers Now time for 20+ psi ;)

 

gotta get a bigger fuel pump for that.

 

hey look! you have two options

http://www.dezod.com/pd_walbro_400lph.cfm

or.

http://www.dezod.com/pd-deatsch-werks-300lph-fuel.cfm

i am a huge help!

 

ill take door # 1. my 900's should get me to 20psi which is where i will keep her. but my 255lph will have to be upgraded, unless there's a diy for a double pumper cause i have a spare 255lph laying around.

 

FYI, I use Amsoil synthetic in my 10 GMC Sierra and had a custom tune my oil always come out clean until I used E85. I ran E85 for 5k and my oil looked like used diesel oil. I'll never use it again.

Sent from my PG86100 using Tapatalk 2

 

Im running dual Deatchwerks 300's But honestly you'd be good with a single Walbro 400. I maxed out a single DW300 around the 450 range.

 

you are going to run out of injector as well

 

yup. im at 55% idc on 12 psi.

 

brett i thought you ran more bewst.

 

The new style Bosch 900s pnp are sweet. Just an idea.

Sent from my PG86100 using Tapatalk 2

 

i did. still waiting on a few more things before i turn the wick back up.

 

so i have noticed that the rpms drop about twice as slowly between shifts and coming out of gear since on e85. anyone else get this?

 

never noticed