Air/Fuel and Ethanol

[Blood on Blood]

Hypothetical situation...

Let's say on straight gas, the air/fuel ratio is 12:1. If the next tank of gas contains 10% ethanol, will the air/fuel ratio go to an approximate 12.5:1 or 11.5:1?

Thanks

Dave

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[95trippleblackconv]

Hypothetical situation...

Let's say on straight gas, the air/fuel ratio is 12:1. If the next tank of gas contains 10% ethanol, will the air/fuel ratio go to an approximate 12.5:1 or 11.5:1?

Thanks

Dave

In open loop it would go leaner but 10% wont be much. I say a wide band would say about 12.25-12:5:1

I run 85% ethanol in my car just under 8:1 or .82 lambda at WOT

 

[Dewalt03cobra]

This is very interesting. I'd like to learn more about this.

I read a little about E85 this winter since I started using it in my Sport Trac. It only has a 205 HP V6, and based on the weight of the vehicle, it acted kind of sluggish. I started using the E85, and it came alive. A week or so ago I actually did a brake torque and was able to roast the back tires on dry pavement on a warm day. I've tried this a couple times since we bought the truck in 2004 and have never come close to spinning the tires. I'd really like to know why the truck drives so much better on E85?

 

[95trippleblackconv]

This is very interesting. I'd like to learn more about this.

I read a little about E85 this winter since I started using it in my Sport Trac. It only has a 205 HP V6, and based on the weight of the vehicle, it acted kind of sluggish. I started using the E85, and it came alive. A week or so ago I actually did a brake torque and was able to roast the back tires on dry pavement on a warm day. I've tried this a couple times since we bought the truck in 2004 and have never come close to spinning the tires. I'd really like to know why the truck drives so much better on E85?

Your car must be made to run on E85 or you need to do some fuel system and timing changes to use it. You need 30% to 40% bigger injectors then gas

From Wikipedia
E85 has been repeatedly shown to produce more power than a comparable gasoline fuel, especially in engines that need high octane fuels to avoid early detonation.[3] Ford Motor Company found that power typically increased approximately 5% with the switch to E85 [4]. Researchers working on the equivalent of E85 fuel for general aviation aircraft AGE-85 have seen the same results with an aircraft engine jumping from 600 hp on conventional 100LL AV gas to 650 hp on the AGE-85. Recorded power increases range from 5% to 9% depending on the engine.

E85 links

http://en.wikipedia.org/wiki/E85
http://www.theturboforums.com/e85dyno.php
http://forums.turbobricks.com/showthread.php?t=73061
http://www.e85mustangs.com/index.html

 

[DIDRace.com]

E85 is good stuff. 105 octane pump gas cheaper than 89 octane gasoline. The only downfall is the extra fuel consumption considering stoich for E85 is 9.765:1 vs 14.7:1 for gasoline. I've tuned a couple cars on E85, it's great for forced induction applications. Any newer cars you really don't have to worry about the ethanol damaging gaskets/o-rings or anything, all you need is bigger injectors and fuel pump to keep up with the extra fuel consumption for a given hp level.

 

[Dewalt03cobra]

E85 is good stuff. 105 octane pump gas cheaper than 89 octane gasoline. The only downfall is the extra fuel consumption considering stoich for E85 is 9.765:1 vs 14.7:1 for gasoline. I've tuned a couple cars on E85, it's great for forced induction applications. Any newer cars you really don't have to worry about the ethanol damaging gaskets/o-rings or anything, all you need is bigger injectors and fuel pump to keep up with the extra fuel consumption for a given hp level.

So if that being true, I could put this stuff in the Cobra if say I put 60lb. injectors in, GT fuel pumps, and a retune?

 

[[email protected]]

So if that being true, I could put this stuff in the Cobra if say I put 60lb. injectors in, GT fuel pumps, and a retune?

Yup. Give us a call @ (815) 726-3838 and I can run you through what needs to be done. :headbang:

 

[95trippleblackconv]

So if that being true, I could put this stuff in the Cobra if say I put 60lb. injectors in, GT fuel pumps, and a retune?

I would like to see another E85 Mustang around here. E85 usually runs 20 to 30 cents less the reg unleaded. I don't see much difference in the mileage

 

[Dewalt03cobra]

Yup. Give us a call @ (815) 726-3838 and I can run you through what needs to be done. :headbang:

On either the 21st or the 28th I'll be out to see your shop and watch the dyno runs, and I'll talk to you then. Thanks. :biggthump