E85 and Cats..... keep or delete? Help!

[WildHorse]

no worries! appreciate your info so far btw. same to you @WildHorse . I don't claim to know everything, but id like to learn, so these discussions are awesome.

Well for me e85 isn't an option. However no doubt its a good fuel. I use one station that carries very sweet 94 E10. So i generally stick with that. For race gas i use 100+ octane that has around the same stoichs. Cheers.

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[NGOT8R]

I wish all gas stations that sold E85 carried a fuel supply with high a ethanol content. So far, I have filled up at three different stations and had the following ethanol content 65.5%, 72.5% and 84.7%. Would like to stay at 80% or above, so that I can stay on the E85R tune and not have to switch back to the Flex. The R tune really wakes the motor up!

 

[K4fxd]

I've tested to E40 on my car on the stock tune.

Logs showed long term trims to be at 10%. Commanded lambda and measured were the same, so it was safe.

I didn't feel comfortable with the trims at 10%

I am comfortable running E20 to E30 on my car with the factory tune. Asking around most are safe at E30. Should be good for a couple points of octane.

I run a flex tune so I don't worry about what is coming out of the pump. The dash A/F gauge tells me what E% I have.

 

[Dave2013M3]

Good to know thanks.

 

[Jordan @ Lethal]

It could be my lack of understanding..

But i didnt think using e85 with 91 to help octane levels was advised as they have very different stoich values. I thought it should be either straight e85 (or whatever you have)..or mix race gas (the vp101 or sunoco 100, etc) with 91 (pump gas). Am i incorrect in this info?

It's not generally a good idea to use E85 as an octane booster because of the stoich levels. There are various mixtures of ethanol with gasoline as you've heard such as E25, E30, E60 etc. These mixtures come with their own stoich levels and octane ratings and thusly must be accounted for in tuning. You can run various ratios of gasoline to ethanol content without concern for switching tunes if you are running a flex-fuel tune as it's got this taken into consideration to accommodate for a range of octane and stoich levels. Standard gasoline in the U.S. is technically E10 and requires an AFR of 14.0:1 to achieve stoichiometric (optimal AFR). E85 requires right around 9.85:1. Energy content of ethanol is a good bit less than gas.

 

[Adamone92]

It's not generally a good idea to use E85 as an octane booster because of the stoich levels. There are various mixtures of ethanol with gasoline as you've heard such as E25, E30, E60 etc. These mixtures come with their own stoich levels and octane ratings and thusly must be accounted for in tuning. You can run various ratios of gasoline to ethanol content without concern for switching tunes if you are running a flex-fuel tune as it's got this taken into consideration to accommodate for a range of octane and stoich levels. Standard gasoline in the U.S. is technically E10 and requires an AFR of 14.0:1 to achieve stoichiometric (optimal AFR). E85 requires right around 9.85:1.

that's good information. thank you! I definitely need to research this stuff even more. But that's true for a lot of things tbh lol

 

[Jordan @ Lethal]

As the saying goes, there's levels to this sh!t

 

[WildHorse]

I am comfortable running E20 to E30 on my car with the factory tune. Asking around most are safe at E30. Should be good for a couple points of octane.

Well now that's interesting. It trimmed out safely @ E30 when Ford says max E15. What was the duty cycle on the injectors at 30% ? Also, how'd the stock fuel pump handle the less dense fuel ? Thanks.

 

[K4fxd]

Everything was in the good range, just using more trim than I like. Basically to run flex all you have to do is turn on a switch in the fuel directory and fill in a couple of tables. You can get the info from studying the truck tables.

 

[AdrianMAK]

E85 doesn't require you remove the cats. Thankfully we also offer an option so that you can pick up all the power, stay legal, and keep the noise down if that's needed/desired. We have slowly been rolling out G-Sport Catalytics into our options. This allows the guys who need to stay legal the option to have their cake and eat it too. Take it from us, the best cat is no cat, but when one is required this is the way to go. Our G-Sports are capable of handling 800HP per bank, and while they are on the pricy side, they are a great option for legality and piece of mind for those who require it. Last thing you want on a boosted car is spitting a stock cat or cheap cat out one of the pipes. If anyone has any questions please feel free to ask or PM me.

 

[Dave2013M3]

Well now that's interesting. It trimmed out safely @ E30 when Ford says max E15. What was the duty cycle on the injectors at 30% ? Also, how'd the stock fuel pump handle the less dense fuel ? Thanks.

Thats what I have been saying, I have run as high as E20 with absolutely no issues at all.

 

[WildHorse]

I have run as high as E20 with absolutely no issues at all.

So have I. and at 20% i didn't like how far the fuel trims had to compensate. You checked the logs at full boogy say at 7000 rpm ?

 

[Dave2013M3]

So have I. and at 20% i didn't like how far the fuel trims had to compensate. You checked the logs at full boogy say at 7000 rpm ?

No haven't logged it yet. I will check, do you think they will be that far off. Also, I have to learn how to use the procal 4 tool to do this.

 

[WildHorse]

No haven't logged it yet

I keep forgetting the 18+ have DPI & PFI. So obviously that helps and makes any of my points moot haha.

 

[Dave2013M3]

I keep forgetting the 18+ have DPI & PFI. So obviously that helps and makes any of my points moot haha.

Yea!! Come on you had me worried!! J/K!!

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