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kosselborn kosselborn is offline
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Default E85 Blends - 05-14-2020, 01:23 PM

I'm new to flex fuel and E85 as well as blending and such, but i was looking for advice on how and where to get started with it. Are the gains really that big from what others are saying. What equipment would i need? Currently supporting a SXTH intake, and JB4 on map 2 at this time. TIA


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Iam Broke Iam Broke is offline
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Default 06-13-2020, 08:23 AM

2:1 mix of gas to e85 would be 35% e but most e85 in my area is e70 actual by test kit. Yields 30% by volume. Been mixing since 2008, gains are defworth it. I used to run 60% on my 2008 Cobalt SS LNF before fueling issues appeared. (sputtering due to low hi pressure fuel pump output) The higher the %e the more fueling is needed. E85 runs ~30% more fuel for the same stoich. I won't say afr because lambda makes more sense tuning alternative fuels. Some tuners keep terms of the same afr but it's a fudge since stoich is different on the fuels. E10 gas is 14.1, pure gas is 14.7, e85 is 9.8 afr for stoich or lambda 1.0

Lamda=1.0 for stoich regardless of fuel.

Short answer, yes, it's worth it.
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kosselborn kosselborn is offline
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Default 06-17-2020, 05:52 AM

Quote:
Originally Posted by Iam Broke
2:1 mix of gas to e85 would be 35% e but most e85 in my area is e70 actual by test kit. Yields 30% by volume. Been mixing since 2008, gains are defworth it. I used to run 60% on my 2008 Cobalt SS LNF before fueling issues appeared. (sputtering due to low hi pressure fuel pump output) The higher the %e the more fueling is needed. E85 runs ~30% more fuel for the same stoich. I won't say afr because lambda makes more sense tuning alternative fuels. Some tuners keep terms of the same afr but it's a fudge since stoich is different on the fuels. E10 gas is 14.1, pure gas is 14.7, e85 is 9.8 afr for stoich or lambda 1.0

Lamda=1.0 for stoich regardless of fuel.

Short answer, yes, it's worth it.
So i could do like 3 gallons of E85 and fill up with 93, select map 3, and no further changes would be needed?


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Iam Broke Iam Broke is offline
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Default 06-17-2020, 06:41 AM

I think you could go up to 5 gallons no problem the first time, do 4 after that and log it to make sure it isn't pulling timing. I ran map 4 with hks plugs before adding fuel control wire, trying map 5 soon.
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kosselborn kosselborn is offline
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Default 06-17-2020, 07:31 AM

Quote:
Originally Posted by Iam Broke
I think you could go up to 5 gallons no problem the first time, do 4 after that and log it to make sure it isn't pulling timing. I ran map 4 with hks plugs before adding fuel control wire, trying map 5 soon.
And i dont need a different fuel pump or sensor to do this, just simply change the map? Sorry for my ignorance, new to this.


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Iam Broke Iam Broke is offline
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Default 06-17-2020, 07:34 AM

Not that I'm aware of. You can log hi pressure fuel pump pressure to see if it drops off. If it gets too low you will get stutter as it doesn't get enough fuel. You'll know if it happens.
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stargtsi stargtsi is offline
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Default 06-23-2020, 08:16 AM

4 gallons seems to be the sweet spot. I ran up to 5 gallons and ran into check engine lights for the fuel pump
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