is there a HP boost with lund octane difference

[MSMStannyl]

within reason.

if your running a 100 octane specific tune, it will be made specifically for higher octane, and will be set up more aggressively.

a 93 octane tune will be "maximized" with 100 octane added.

it's not really recommended to run 87 on a 93 octane tune, but the knock sensors will pull timing.

91 and 93 are much closer, that the car won't work as hard.

if your constantly changing fuels, the flex fuel tune would be your best bet

Gotcha. So based on your reply, I would probably go with a 93 tune, but would be fine with the occasional 91 octane gas if needed.

I was under the impression the Flex Fuel tune was for bouncing between E85 and normal gas, although I guess it makes sense that it would also allow you to bounce around octanes without any issues.

One more question. What would be the best in regards to performance and engine reliability:

- Running a 93 specific tune and using 93 octane gas?

- Running a Flex Fuel tune and using 93 octane gas?

Would these two perform the same or would you lose a little something with the Flex Fuel tune being a "jack of all trades" kinda tune?

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[Derek@Lethal]

Gotcha. So based on your reply, I would probably go with a 93 tune, but would be fine with the occasional 91 octane gas if needed.

I was under the impression the Flex Fuel tune was for bouncing between E85 and normal gas, although I guess it makes sense that it would also allow you to bounce around octanes without any issues.

One more question. What would be the best in regards to performance and engine reliability:

- Running a 93 specific tune and using 93 octane gas?

- Running a Flex Fuel tune and using 93 octane gas?

Would these two perform the same or would you lose a little something with the Flex Fuel tune being a "jack of all trades" kinda tune?

You can run 91 on a 93 tune with no issues, they only write one file for pump gas tunes that covers 87 to 93 octanes.

Flex tunes are for bouncing between gasoline and ethanol, it's really no different once the PCM has learned the fuel being used BUT you cannot run the lower grade gasolines on this tune.

The 93 and flex tunes will perform the same on 93, again, once the PCM learns the fuel being used.

Hope that clears things up!

 

[beefcake]

Gotcha. So based on your reply, I would probably go with a 93 tune, but would be fine with the occasional 91 octane gas if needed.

I was under the impression the Flex Fuel tune was for bouncing between E85 and normal gas, although I guess it makes sense that it would also allow you to bounce around octanes without any issues.

One more question. What would be the best in regards to performance and engine reliability:

- Running a 93 specific tune and using 93 octane gas?

- Running a Flex Fuel tune and using 93 octane gas?

Would these two perform the same or would you lose a little something with the Flex Fuel tune being a "jack of all trades" kinda tune?

flex fuel tune would give the "best", reason being it is fully adaptive.

you will get some 93s that have a higher ethanol content, so the car will give maximum timing for that fuel.

even some 91s will be stronger and it will adapt better, and some 93s that aren't as good.

fully adaptive flex fuel would be the best, but if you don't want to spend the $$ occassional 91 on 93 will be ok

 

[MSMStannyl]

You can run 91 on a 93 tune with no issues, they only write one file for pump gas tunes that covers 87 to 93 octanes.

Flex tunes are for bouncing between gasoline and ethanol, it's really no different once the PCM has learned the fuel being used BUT you cannot run the lower grade gasolines on this tune.

The 93 and flex tunes will perform the same on 93, again, once the PCM learns the fuel being used.

Hope that clears things up!

Ah ha! Ok, that definitely makes sense. That's what I was wondering.

flex fuel tune would give the "best", reason being it is fully adaptive.

you will get some 93s that have a higher ethanol content, so the car will give maximum timing for that fuel.

even some 91s will be stronger and it will adapt better, and some 93s that aren't as good.

fully adaptive flex fuel would be the best, but if you don't want to spend the $$ occassional 91 on 93 will be ok

Understood. Perhaps it's not a bad idea then for a Flex Tune even if I have no real plans of running E85. It sounds like the safest best as it will always adapt to give you the best possible performance for the fuel in your tank.


Thank you both for the info. I'm def starting to lean towards tuning my car just to get the most out of it. Before, my issue was warranty but now that I'm pushing 26,000 miles, I'm starting to get that itch. I see both of you guys constantly responding in threads to peoples questions and appreciate your involvement. It's great to have such vendor support in this community, especially for those of us somewhat new to this platform (not my first rodeo with mods or tunes but this is my first Mustang/American car).

Anyway, when the time comes, I might just have to flip a coin! Thanks for the help guys!

 

[beefcake]

Ah ha! Ok, that definitely makes sense. That's what I was wondering.



Understood. Perhaps it's not a bad idea then for a Flex Tune even if I have no real plans of running E85. It sounds like the safest best as it will always adapt to give you the best possible performance for the fuel in your tank.


Thank you both for the info. I'm def starting to lean towards tuning my car just to get the most out of it. Before, my issue was warranty but now that I'm pushing 26,000 miles, I'm starting to get that itch. I see both of you guys constantly responding in threads to peoples questions and appreciate your involvement. It's great to have such vendor support in this community, especially for those of us somewhat new to this platform (not my first rodeo with mods or tunes but this is my first Mustang/American car).

Anyway, when the time comes, I might just have to flip a coin! Thanks for the help guys!

its not just the power, but the throttle response and everything associated,

a tune just makes the car all around better

 

[Derek@Lethal]

Thank you both for the info. I'm def starting to lean towards tuning my car just to get the most out of it. Before, my issue was warranty but now that I'm pushing 26,000 miles, I'm starting to get that itch. I see both of you guys constantly responding in threads to peoples questions and appreciate your involvement. It's great to have such vendor support in this community, especially for those of us somewhat new to this platform (not my first rodeo with mods or tunes but this is my first Mustang/American car).

Anyway, when the time comes, I might just have to flip a coin! Thanks for the help guys!

You got it. Let us know if you have any other questions and we'd be glad to assist you! :cheers:

 

[MSMStannyl]

its not just the power, but the throttle response and everything associated,

a tune just makes the car all around better

I actually just installed a JMS Pedalmax the other day so I'm good on the throttle response part!

 

[Orange_cru$h]

What will happen if I have a Lund 91 Oct flex fuel tune and I add 93 E10 gasoline?

 

[Derek@Lethal]

What will happen if I have a Lund 91 Oct flex fuel tune and I add 93 E10 gasoline?

Absolutely nothing, that's what the flex fuel tune does is adjust between the 91/93 and ethanol fuels. Lund is not making different timing tables for the different pump fuels because the OEM adaptive octane logic can handle that and it's safer for it to do so. Building timing tables for the different pump gas fuels is old school thinking and neanderthal so Lund does not do that with the 11+ cars. I hope that answers your question! :cheers:

 

[Terminator2]

What will happen if I have a Lund 91 Oct flex fuel tune and I add 93 E10 gasoline?

Ecm might add a couple degrees of timing if it sees fit but other than that nothing.

 

[beefcake]

Ecm might add a couple degrees of timing if it sees fit but other than that nothing.

correct

 

[Orange_cru$h]

Thanks for the update..good to know is auto adjusting depending on fuel type and Oct.

 

[Derek@Lethal]

Thanks for the update..good to know is auto adjusting depending on fuel type and Oct.

You're welcome, let us know if we can help you with anything else. :cheers:

 

[robwlf]

damn i didnt know it auto adjusts. so if i got a lund flex fuel tune and ngauge(which im going to in the future).. i can run say 91 octane one week, then say i can fill up on e85 the next and not have a issue.
i had a few cars i had tuned, and we had to change the pump, injectors,and rails to run e85...
if i can run it once and awhile with a lund tune and not change all that .. im so going that route.

im going to add a cai shortly so

 

[Derek@Lethal]

damn i didnt know it auto adjusts. so if i got a lund flex fuel tune and ngauge(which im going to in the future).. i can run say 91 octane one week, then say i can fill up on e85 the next and not have a issue.
i had a few cars i had tuned, and we had to change the pump, injectors,and rails to run e85...
if i can run it once and awhile with a lund tune and not change all that .. im so going that route.

im going to add a cai shortly so

Yes, that is correct. The flex fuel tune allows you to switch between premium gas and e85 without making any changes.

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