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The defacto guide to tuning your car for e85.



industrialfish said:
Question: Does E85 negate the need for colder plugs?
Click to expand...

I'm running stock plugs in mine with stock gaps. I don't have any problems with detonation or cold starts. I had NGK TR6IX before these. They looked pretty crispy after about 20k miles of use. I put the stockers back in because I had them laying in my tool box and never looked back.
 
charlieRobinson said:
ran a 13.3 wednesday night for a new PR. i am using 104 autolites with ~13psi
Click to expand...

You have an Xp cam, E85 and are running a 2.8 and only ran a 13.3? Driver mod? Post your slip if possible cause i'm wondering what your 60 ft was.
Maybe a good set of slicks can get you close to 12's.
 
chrsmi1 said:
You have an Xp cam, E85 and are running a 2.8 and only ran a 13.3? Driver mod? Post your slip if possible cause i'm wondering what your 60 ft was.
Maybe a good set of slicks can get you close to 12's.
Click to expand...


I should probably update my sig that im driving a 4000 pound buick and not a GTP.. 60' was a 2.01
 


Got a 97 F bird with a RWD l67, 4l60e. Car ran high 13's last year in bad (hot!) weather on 6PSI, corrected to a 13.50 FWIW.

S1X, headers, lightly ported heads, Gen III, 2.8" (12PSI), 15 degrees WOT, 47.5 lbs air/min 11,000 Hz, stock l67 MAF. Had it tuned for MN E10 gas. Its a RWD ECM with a 2 bar map and no 2 BAR upgrade for it so its scaled funny and looses some resolution.

Switched to E50 and used method 4 and a 1.11 scale factor. It was tuned on E10 so thats why i didnt go 1.12-3.

Runs good, starts great. Only problem is it falls out of closed loop (I think) during cruise. WOT AFR is 11.2-11.5. Car runs 14.5 afr on cruise sometimes but then falls into some wierd mode where the ECM adds 20% fueling and narrowband O2's go to .9-1.

I can email the HPT file, just wont allow attaching here.

Any thoughts?

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Frosty, do you have the timing table you are using for your car? I would love to look at it.
I am new to e85 and am working on my tune.
I am starting with a 2005 Comp G timing table and seeing no kr so far.
My mileage was 300 to the first full tank.
I went the route of changing the injectors to the following. I may put them back and use your method.

45.84 46.33 46.94 47.95 48.17 48.22 48.22 48.34 48.44 48.51 48.78

L67 - 163k
1.9 modded rockers
90lb blue springs
Modded retainers
Gen 3 - H bar removed
3.2 Press on pulley
104 plugs gapped at .052
60lb Injectors
485 Walbro e85 fuel pump
Racetronix rewire
e85
SSIC - dual heat exchangers
Hogged out factory air box
PLOG
3" non catted downpipe
2.5" Magnaflow resonator
Stock cat-back w/04+ Mufflers
2.93 gears, shift kit
shifting at 6k
 
Id just like to mention that the cold start fix using tiny tuner works pretty well here at consistent -12 to 35 degree cold starts.
 
I just checked my old E85 tune. 41.29 starting at 2000rpm in the Mg/Cylinder 200 through 360 cells. Goes to 36.29 around 4000 rpm.
 


chrsmi1 said:
I just checked my old E85 tune. 41.29 starting at 2000rpm in the Mg/Cylinder 200 through 360 cells. Goes to 36.29 around 4000 rpm.
Click to expand...

Thanks. I am running as high as 47 in those cells. I had a low decline into WOT cells thinking i could squeeze some more MPGs out but I just changed that to a sharp decline to get in the sub 30s as fast as possible.
 
There probably isnt that much difference in a couple * of timing at cruise. I played around and couldnt tell much of a difference once I got above 40. Because pump e85 is so inconsistent (and ****ty for that matter), I wouldn't think you see much difference at cruise. The difference is in the WOT and boost level. But my "opinion" is usually not welcomed on that particular matter when it comes to E85. but I digress...

Just make sure however high you go at cruise that its a smooth flow increasing and decreasing....
 
One thing I didn't see in this sticky is which injectors to use for E85 with a turbo. I have 42's already but the turbo is going on within the next few months and don't want to buy the wrong ones.
 
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