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Tuning / Diagnostics -- engine and transmission Tune and diagnostics for engines and auto transmission.

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Old 12-18-2012, 03:21 PM   #1
granatl
 
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Dual maps for E-85 and gas?

About 1/2 a year ago, I was told that the tuning parameters for E-85 can be loaded into the high octane maps, and then a set of lower timing (& different fueling) can be placed into the low octane maps. Then, there's some way to connect to a pin on the PCM and then have a toggle switch to flip between the two.

Does anyone have the instructions to do this that they'd care to share?
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Old 12-18-2012, 03:44 PM   #2
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I would be intrested in this as well!
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Old 12-18-2012, 03:56 PM   #3
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More has to be changed than the timing tables. E85 requires ~30% more fuel than gasoline.

I do not know of a pin on our ECU that can be grounded to shift dual tunes. Perhaps Trifecta or another aftermarket programmer has a custom OS that can.
I know TF ran dual tunes on the Bosch E69 ECU on the 4 cyl LNF Turbos for different boost levels selectable by the CC button or TC button.

The stock fuel system isn't going to keep up well on E85, I see fuel rail pressure drop from 58 psi to 52 psi on a tuned LS3 on E47. (~15% more fuel @ .87 PE Lambda) & IDC at 80% already. E85 will cause the pressure at the injectors to drop further and Inj duty cycle will rise even more. Most tuners advise not to have IDC run over ~80%.

E47 is a blend of E10 93 & E85 1:1 and is ~99 octane. Not much trouble to blend 1:1 at the pump. If you want to run E85, the injectors may be large enough (it'd be close stock engine to 95 % IDC IMO) but you will prob need a ZL1 in tank fuel pump.
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Old 12-18-2012, 04:02 PM   #4
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I think my Google search finally yielded results...

http://forum.efilive.com/showthread....ight=flex+fuel
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Old 12-18-2012, 04:13 PM   #5
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Let us know how it works out.
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Old 12-18-2012, 04:44 PM   #6
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I should probably mention that I'm about to install 85# injectors and already have dual fuel pumps. Fuel delivery won't be a problem for me.
keeping the tires glued to the pavement, well, that's a whole different problem!
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Old 12-19-2012, 07:20 AM   #7
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It doesn't use the high and low octane tables but rather has separate E85 fuel and timing tables.

I was going to use the EFIL COS to run the nitrous. I added the pin to the ECM and just needed to ground the wire when I activated the nitrous but I never finished wiring it. Went twins instead and now that the car has the HPT 2.5 bar tune EFIL can't read it.

Here is the other thread.
http://forum.efilive.com/showthread....-release/page8
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Old 12-21-2012, 07:43 PM   #8
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okay, so its been 20000 miles and I've been putting in 5 to 6 gallons of e85 with 10 to 11 gallons of 89 gas (its cheaper than 87..... 87 is lawn mower gas)

results are better performance, reduced high way economy (this is good) no difference in city economy

overall your money up and your egr, intake tb as well as injectors should be cleaner....

oh and also when i can't find e85 on long trip, i just use premium

no modification needed ...... go gasahol
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