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Thread: E85 and flex fuel setup

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Posts: 11-16 of 16
2013-12-05 02:57:00
#11
Originally Posted by SR20?
So in the case that I am making 400+ I should run stainless braided lines from the tank to the rail? I can see how the stock hard lines on the car could be restricting with the amount of flow I will need for E85. I have AN -6 running from the hard lines on the firewall to the rail and FPR with an inline filter, is that not sufficient for 400+? I was thinking my walbro 255 would be my weakest point.

Also curious about the wideband. Do I need to go into the settings and switch the fuel to E85? Or will it read properly without changing anything? What AFRs do I tune for?


I would suggest looking at picking up a Walbro E85 compatible 450 pump and do at least -6an from the pump to the rail.

You won't need to switch the settings on your wideband to E85 .. you can use the same old gasoline settings like normal.
2013-12-05 03:01:33
#12
I was just gonna say JKTUNING would be better suited to answer those questions. haha
2013-12-05 03:45:10
#13
So I will tune for 11.5:1 WOT, 14.7:1 cruising/idle, etc.? Just clarifying.
2013-12-05 11:03:50
#14
E85 and flex fuel setup
Originally Posted by SR20?
So I will tune for 11.5:1 WOT, 14.7:1 cruising/idle, etc.? Just clarifying.


Exactly. The o2 sensor reads in lambda. And stoics for e85 and gasoline is 1 lambda. The wideband adds a multiplier of lambda x 14.7 do give a afr.
2013-12-05 14:52:59
#15
Originally Posted by SR20?
So I will tune for 11.5:1 WOT, 14.7:1 cruising/idle, etc.? Just clarifying.


Yep, that will work.

You can actually go a touch leaner with E85 if you would like for WOT .. the extra cooling properties of the ethanol make it safer to do so and you will pick up a little power.

I would shoot for around 11.8-12.0 on ethanol at WOT.
2013-12-06 02:11:44
#16
Definitely going to go E85 soon, seems to be pretty straightforward to switch. Those walbro 450 pumps are fairly cheap, too.
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