Fourdoor

iTrader: (11)

Hey guys,

Since we don't seem to have an alternative fuels sub forum, I figure this is the best place to post about tuning with E-85.

I am about a week away from getting cams, ported intake manifold, 1000cc injectors, double pumper fuel system and (of course) the new fuel relay done along with a full E-85 fuel tune. This time of year it is actually an E-70 tune. I will post up my results here.

In the mean time, I want to do a "quick and dirty" re-tune on E-85 and run a few tanks of fuel through my system as it sits now (stock injectors and fuel pump) to avoid having a bunch of gasoline in the mix when I go to get the car tuned. My first inclination is to do a simple re-scale of the injectors. If I lie to the ECU telling it I have 410cc injectors it should give me about 30% more fuel than it is giving right now (scaling stock is 532, 410 * 1.3 = 533)... perfect for a ham handed starting point at least! I will log A/F ratio's from there and see how things are going. I expect it to run rich on the first tank of fuel due to residual gasoline in the tank when I fill up. I really f'ing wish I could log LTFT and STFT

Let me know your thoughts,

Keith

GST Motorsports

iTrader: (8)

Nice,

I've been waiting for a RA owner to do E85. Might finally make me take the plunge and pick up a RA SportBack for myself.

I would imagine you would need to scale the injectors down more towards 360 or so though. Why the DP with stock turbo?

- Bryan

Fourdoor

iTrader: (11)

David isn't comfortable with the stock fuel pump on E-85, and he doesn't sell a single fuel pump upgrade for the X / RA.

Hey Bryan, can you PM me links to your software tweaks that affect the TC-SST operations? I don't know if I will get close to slipping my clutches on the stock turbo, but I would like the option of tweaking those parts of the map if I DO encounter slipping problems.

Scaling down to 360's would give me 48% more fuel than stock! Even on pure E-85 I never saw much more than 30% change in fuel demand. This was with the AEM EMS though, is the stock ECU wonky about it's injector scaling?

I will be setting up a tweaked map later today with the scaling change, and see how it looks in the new 2010 EVO X / RA mode23 logging that is available from EVOscan.

Later,

Keith

Thanks,

Keith

goofygrin

iTrader: (5)

My 1000's are scaled to 522 on E80ish. It's running a touch rich (LTFT idle and cruise are still a bit negative, but I'm having to mess with the latency to dial them in now).

So... add a bunch The stock fuel pump isn't going to really be good for any pulls in this state, nor are the injectors. The stock fuel filter (in the pump), fuel line and the sock are going to get eaten by the E85... so don't run too many tanks through.

mlomker

iTrader: (1)

Running a few tanks through isn't a bad idea at all. Fortunately I'm getting a retune this week so I won't have to wonder if I'm missing some power.

murlo26

iTrader: (9)

Are you tuning this week lomker? No engine break in? Or doing dyno break in? Regardless I need to test your six puck

E85 is the ****, this is truth! I will never go back until they stop selling it.

Fourdoor

iTrader: (11)

I will go back in the winter! E-85 (even E-70) is a cast iron ***** to start in really cold weather. I don't do ice racing, so I don't really need the extra power in the winter

I did the swap to E-85 today. Fill up was 13.58 gallons, so I got most of the gasoline out before swapping over

Using the 412 cc injectors on the scaling worked out perfect. I have 14.5 at idle and cruise with 11:1 under short duration WOT bursts. Since I can't log LTFT or STFT yet, this is the closest I can come to saying I got it right

Later,

Keith

GST Motorsports

iTrader: (8)

How cold you having issues with?

My personal Evo starts first crank after sitting all night outside covered in snow in 12-15F (about as cold as it gets in Tahoe, California)

- Bryan

murlo26

iTrader: (9)

Mine also fires right up no matter what. A little longer now with the double pumper, but I had no issues starting it at -25F here in MN.

ikt

iTrader: (18)

i just put in my 255 pump last night, and my 750cc's are coming in a few days. I'm going to run that with Cobb stage 2 using the DW800 OTS maps scaled to 725 for 750cc injectors. Me and a dremel managed to mount the 255 with no special adapters, and I can make an inline fuel filter for about $40 bucks

goofygrin

iTrader: (5)

800s @ 725 is not right for E85.

750s @ 725 on e85 = bo00om *****!

criptballer

iTrader: (3)

do you mind posting a print screen of your scaling and latency tables. i'm curious because mine are at like 640 and my idle LTFT are at -4.8 and my cruise LTFT are at +4 ish. but if you have your global scaling that low with low with better LTFT then i might go down a tad too. i'll post mine when i get home to compare too.

saytheb

iTrader: (2)

Cobb OTS STage 2 E85 DW800s is NOT scaled at 725 - That sounds like 91/93 octane map... I based my map off the E85 map.

I have cold start issues with E85 even when it's 40* in my garage.. I am leaning more and more towards snagging a tactrix while I wait for Cobb to get more tables in place in ATR =/

ikt

iTrader: (18)

Right, I used AccessTuner to re-scale their maps for my 750ccs, and yes that was for the 93 octane map w/750cc injectors.

The e85 scaling was 504 for 750cc

goofygrin

iTrader: (5)

I'm currently still futzing with them honestly.

Latencies:
5.952
5.16
2.712
1.776
1.416
1.056
0.912

I reset the ecu this morning and my fuel trims are (when I got to work):
idle: 0.195313 cruise: 2.73438

Before I started this latest round of futzing, I was Idle: -7.9 Cruise: -.5ish