Lund Flex Fuel with race gas?

[SVT-DADDY]

I am getting a Lund tune and Steeda intake soon. No E85 where I live.

Is there any benefit if I get a flex fuel tune if I fuel up with some race fuel on a dyno or track day?

If so for the extra few bucks it's worth doing for me.

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[2015 Silver GT]

E85 is available in a few locations in CT. You can also buy it in drums.

 

[350Mike]

I'd like to know as well

 

[18psi]

My understanding (could be wrong, someone chime in if so) is that the ecu bases the "flex fuel" function around fuel trims, with a few other sensors helping out. Meaning there's no "octane sensor" or "flex sensor".

However, I'm curious if the knock sensor not detecting any knock with race fuel would keep the car adding timing until it's maxed out the commanded timing, as it would with e85?

Anyways I don't know for sure but now I'm curious just like you

 

[Jay-rod427]

Flex fuel does not mean "race fuel" compatible. The flex fuel logic is figured out by the O2 sensors, and what the computer knows its injecting for fuel and air amount. It is entirely predicted by the expected stoichiometry of E85/91 or any mix of. If you add another fuel with a different stoich you will have big time problems.

 

[SVT-DADDY]

E85 is available in a few locations in CT. You can also buy it in drums.

Where are you finding in it CT?

 

[SVT-DADDY]

However, I'm curious if the knock sensor not detecting any knock with race fuel would keep the car adding timing until it's maxed out the commanded timing, as it would with e85?

Thats my question exactly.

I actually emailed Lund just now as well.

 

[bluebeastsrt]

Why not just have Lund write you a race gas tune?

 

[SVT-DADDY]

Why not just have Lund write you a race gas tune?

Because this won't be a common thing. I am talking about throwing a few gallons of C16 in for a dyno or track day.

I usually have c16 hanging around from my snowmobile that I do this same thing with over the winter.

 

[bluebeastsrt]

Because this won't be a common thing. I am talking about throwing a few gallons of C16 in for a dyno or track day.

I usually have c16 hanging around from my snowmobile that I do this same thing with over the winter.

Your tuning device will hold more than one tune. Contact Lund and see what they recommend. Down just buy a flex fuel tune and throw some home brew at it and hope for the best.

 

[2015 Silver GT]

Where are you finding in it CT?

I know of one in Danbury and one in Waterford but admittedly they're scarce.

 

[ProChargerTECH]

Because this won't be a common thing. I am talking about throwing a few gallons of C16 in for a dyno or track day.

I usually have c16 hanging around from my snowmobile that I do this same thing with over the winter.

Unless your car has boost, you will loose HP with C16.

You would want to run the fuel with the highest amount of BTU's and power energy. Not something for suppressing detonation for ultra high compressor or boost levels.

Even a coyote on say 15psi, doesn't require much more than 110 octane.

 

[SVT-DADDY]

Unless your car has boost, you will loose HP with C16.

You would want to run the fuel with the highest amount of BTU's and power energy. Not something for suppressing detonation for ultra high compressor or boost levels.

Even a coyote on say 15psi, doesn't require much more than 110 octane.

I hear what your saying but I am not talking about running straight C16 just a couple gallons in the tank to end up with something around 95-96 octane.

 

[SVT-DADDY]

I know of one in Danbury and one in Waterford but admittedly they're scarce.

I am actually in Danbury often! Do you know who has it?

 

[Plimmer]

Because this won't be a common thing. I am talking about throwing a few gallons of C16 in for a dyno or track day.

I usually have c16 hanging around from my snowmobile that I do this same thing with over the winter.

C16 is the wrong fuel for dyno or track day, its leaded and NOT oxygenated.

You should choose an unleaded oxygenated fuel like MS109 or C85. Oxygenated fuels is where the extra power comes from.

For MS109 I'd use your normal tune, and for C85 the flex fuel tune. Keep the C16 for your snowmobile.

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