93 OCTANE vs 91 OCTANE TUNE - Mustang Evolution

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Old 10-23-2012, 05:30 PM   #1
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93 OCTANE vs 91 OCTANE TUNE

Is there a difference in a 93 octane tune, and a 91 octane tune. Im trying to find a tuner on American muscle, but they all say 93 octane tune. Where i live they don't have 93 octane, just 91 so what would i have to do if I got a tune for 93?
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Old 10-23-2012, 06:09 PM   #2
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Originally Posted by bradtaylornator View Post
Is there a difference in a 93 octane tune, and a 91 octane tune. Im trying to find a tuner on American muscle, but they all say 93 octane tune. Where i live they don't have 93 octane, just 91 so what would i have to do if I got a tune for 93?
They offer 91 and 87, if your talking about the 5.0 engine anywho.

Race tune and Performance tune can only do 91 and 93, but the street tune can also do 87.

Just that 87 isn't recommended.

So your good, get the tuner, and when you get the e-mail to create your tunes that asks you what mods you have done to your car, just chose all the tunes be 91.
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Old 10-23-2012, 06:22 PM   #3
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Yea its the 5.0 thanks for the info. i only run 91 anyways i just didn't wanna buy a tune that didn't have a 91 tune. So what states sell 93. I guess us good ol Oklahoma boys don't need no dad gurn 93 gas anyhows
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Old 10-23-2012, 06:52 PM   #4
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Originally Posted by bradtaylornator
Yea its the 5.0 thanks for the info. i only run 91 anyways i just didn't wanna buy a tune that didn't have a 91 tune. So what states sell 93. I guess us good ol Oklahoma boys don't need no dad gurn 93 gas anyhows
I dk by list. I live in Ohio right by northern Kentucky and both places sell 93. Pulled into a station the other day that sells 92...never ever seen 92 before.

I know not everywhere sells 93. Not sure why. I thought some cars were recommended to run 93. So dk what you do in those areas.
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Old 10-23-2012, 07:49 PM   #5
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Originally Posted by nosympathy

I dk by list. I live in Ohio right by northern Kentucky and both places sell 93. Pulled into a station the other day that sells 92...never ever seen 92 before.

I know not everywhere sells 93. Not sure why. I thought some cars were recommended to run 93. So dk what you do in those areas.
I've never seen anywhere in Oklahoma that sells 93 i honestly didn't even know there was a 93 pump gas
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Old 10-23-2012, 08:19 PM   #6
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I'm getting a tune for 91 but around here everywhere is 92. Will it run fine or do I need to find a place that has 91?
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Old 10-23-2012, 08:41 PM   #7
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I think it's odd they offer 87 tunes for the new 5.0's. They only offered 91 and 93 tunes for my Mach1. I'm told it is because the 4.6L 4v's require 91 octane from the factory. That is because the compression is a little higher (10:1) than the 4.6L 2v. Well, the new 5.0 has 11:1, doesn't it? Seems like they would only offer 91 and 93 octane tunes for the 5.0 as well.
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Old 10-23-2012, 09:09 PM   #8
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I was originally provided 91 and 93 octane tunes with my tuner ... when I added a CAI I was told the new 91 octane tune was the same as the 93 and the factory strategy would add timing when using 93.

I was a little confused by this ... especially since the same tuner provided separate 91 and 93 tunes a few months earlier.

That said, if this is indeed true and a 91 tune will add timing for 93 octane fuel ... what would be the difference between the two tunes, if any?
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Old 10-23-2012, 09:31 PM   #9
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I'm getting a tune for 91 but around here everywhere is 92. Will it run fine or do I need to find a place that has 91?
You'll be fine. You just can't go the other way, and run a lower octane that what the tune calls for. My understanding is you can possibly damage the engine this way. I always have an 87 tune for this reason, just incase something were to happen, and all I could get was 87 octane gas, I would just retune and call it a day.

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Originally Posted by Azure View Post
I think it's odd they offer 87 tunes for the new 5.0's. They only offered 91 and 93 tunes for my Mach1. I'm told it is because the 4.6L 4v's require 91 octane from the factory. That is because the compression is a little higher (10:1) than the 4.6L 2v. Well, the new 5.0 has 11:1, doesn't it? Seems like they would only offer 91 and 93 octane tunes for the 5.0 as well.
Thought I showed you the Ford provided document on the Mustang 5.0 engine(maybe was someone else?) for the 2011 year, that shows that minimum operating fuel is 87, but that recommended is 91. It runs on 87, when I bought the car they filled it with 87, I ran it 3 months on 87, not really thinking about it at the time. To answer your question too, yes the compression is 11.0:1 on the 5.0 engine.

The 2007 Tundra I have with the 5.7L i-Force V8 runs a 10.3:1 compression and it is recommended to run off 87 octane gas by Toyota. I have had it since late 2006 and it still to this day has never had an octane higher than 87 in its tank, and runs like a charm, and she gets driven rough.

If you would like that document, it is located HERE which is Ford themselves...
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Old 10-23-2012, 09:40 PM   #10
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Quote:
Originally Posted by Azure
I think it's odd they offer 87 tunes for the new 5.0's. They only offered 91 and 93 tunes for my Mach1. I'm told it is because the 4.6L 4v's require 91 octane from the factory. That is because the compression is a little higher (10:1) than the 4.6L 2v. Well, the new 5.0 has 11:1, doesn't it? Seems like they would only offer 91 and 93 octane tunes for the 5.0 as well.
Because of the knock sensors and the ability to adjust/pull timing... It's more like it will run on 87, but the way I see it would be that 87 octane is a last resort
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Old 10-23-2012, 09:44 PM   #11
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Originally Posted by nosympathy View Post
You'll be fine. You just can't go the other way, and run a lower octane that what the tune calls for. My understanding is you can possibly damage the engine this way. I always have an 87 tune for this reason, just incase something were to happen, and all I could get was 87 octane gas, I would just retune and call it a day.



Thought I showed you the Ford provided document on the Mustang 5.0 engine(maybe was someone else?) for the 2011 year, that shows that minimum operating fuel is 87, but that recommended is 91. It runs on 87, when I bought the car they filled it with 87, I ran it 3 months on 87, not really thinking about it at the time. To answer your question too, yes the compression is 11.0:1 on the 5.0 engine.

The 2007 Tundra I have with the 5.7L i-Force V8 runs a 10.3:1 compression and it is recommended to run off 87 octane gas by Toyota. I have had it since late 2006 and it still to this day has never had an octane higher than 87 in its tank, and runs like a charm, and she gets driven rough.

If you would like that document, it is located HERE which is Ford themselves...
I agree it should be 87,,but you can run 93 even without a tune and get a little bit more out of it,,but you have to run the 93 in it for a while to notice the difference,,not just one tankful every once in a while,,87 should run fine with any mustang,,but not sure about the cobra mustang
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Old 10-23-2012, 09:52 PM   #12
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Originally Posted by nosympathy View Post
Thought I showed you the Ford provided document on the Mustang 5.0 engine(maybe was someone else?) for the 2011 year, that shows that minimum operating fuel is 87, but that recommended is 91. It runs on 87, when I bought the car they filled it with 87, I ran it 3 months on 87, not really thinking about it at the time. To answer your question too, yes the compression is 11.0:1 on the 5.0 engine.

The 2007 Tundra I have with the 5.7L i-Force V8 runs a 10.3:1 compression and it is recommended to run off 87 octane gas by Toyota. I have had it since late 2006 and it still to this day has never had an octane higher than 87 in its tank, and runs like a charm, and she gets driven rough.

If you would like that document, it is located HERE which is Ford themselves...
Maybe, I don't try to remember everything. It might push something important out the other side.

"Recommended"<---I think I would go by this if it were my car

This is my opinion, but I'm not surprised that 87 will work on a stock ECU. A tuned ECU is a different story. I would be worried about trying to run 87 in the new 5.0's that have been tuned. If it has been "tuned" for 87, I would imagine that the tune is 95% stock and would probably not amount to a gain in power or acceleration. And that would mean purchasing the tuner would be a waste of money. I personally run on the conservative side and go with 91 tunes and always put 93 octane in the car. This gives me a little buffer for bad gas. I feel plenty of difference in the tunes, even the Street tune. That's me, I think the 93 tunes are fine, I personally don't trust the gas stations.
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Old 10-24-2012, 05:55 AM   #13
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Originally Posted by bradtaylornator

I've never seen anywhere in Oklahoma that sells 93 i honestly didn't even know there was a 93 pump gas
A few Sunoco stations by me have 94. I always run 93. There is one Sunoco station about a mile from the drag strip that I go to that sells 97. They used to sell 104. At the track you can buy 112 Race fuel and C16.
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Old 10-24-2012, 09:25 AM   #14
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Originally Posted by bradtaylornator View Post
Is there a difference in a 93 octane tune, and a 91 octane tune. Im trying to find a tuner on American muscle, but they all say 93 octane tune. Where i live they don't have 93 octane, just 91 so what would i have to do if I got a tune for 93?
Bradtyalornator,

We advertise our tunes for 93 Octane because for the biggest horsepower gains, you have to run the highest octane level available. We can write our Street and Performance tune for 87,91 or 93. The Race, Hybrid and Ghost Cam tunes have to be written with 91 or 93!

I hope this helps, if you have any further questions feel free to hit me up! Our Bama Performance tuning specialists are here in the building Monday-Friday from 9AM-5:30PM EST and Saturday 9AM-5:30PM EST. You can hit them up directly at 888.226.9764 and they'll get you squared away!

-Dan
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Old 10-24-2012, 09:45 AM   #15
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Originally Posted by AMDanBailer

Bradtyalornator,

We advertise our tunes for 93 Octane because for the biggest horsepower gains, you have to run the highest octane level available. We can write our Street and Performance tune for 87,91 or 93. The Race, Hybrid and Ghost Cam tunes have to be written with 91 or 93!

I hope this helps, if you have any further questions feel free to hit me up! Our Bama Performance tuning specialists are here in the building Monday-Friday from 9AM-5:30PM EST and Saturday 9AM-5:30PM EST. You can hit them up directly at 888.226.9764 and they'll get you squared away!

-Dan
Thanks fir the info!
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Old 10-24-2012, 10:28 AM   #16
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[QUOTE="Azure"]I'm told it is because the 4.6L 4v's require 91 octane from the factory. That is because the compression is a little higher (10:1) than the 4.6L 2v./QUOTE]

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Originally Posted by mymustang

87 should run fine with any mustang,,but not sure about the cobra mustang
87? (Buzzer sound) at least for me 91+ on any performance machine. As for the Cobra 91+ only. Like Azure said 4v's need the higher octane
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Old 10-24-2012, 10:41 AM   #17
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I can get 93 locally but I have timing pulled out of my car to be around 91 octane levels just to have a safety margin
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Old 10-24-2012, 11:22 AM   #18
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Bradtyalornator,

We advertise our tunes for 93 Octane because for the biggest horsepower gains, you have to run the highest octane level available. We can write our Street and Performance tune for 87,91 or 93. The Race, Hybrid and Ghost Cam tunes have to be written with 91 or 93!

I hope this helps, if you have any further questions feel free to hit me up! Our Bama Performance tuning specialists are here in the building Monday-Friday from 9AM-5:30PM EST and Saturday 9AM-5:30PM EST. You can hit them up directly at 888.226.9764 and they'll get you squared away!

-Dan
I guess what confuses me with these tunes is that supposedly the factory strategies will add timing for the higher octane fuel, and pull timing for lower octane fuel.

What is it about these octane-specific tunes that makes them different? Will the 93 tune not pull timing if someone puts in 91, and will the 91 not add timing if someone puts in 93?

I'm asking because I was provided a tune from someone else and was told there was no difference between 91 and 93 but the 91 tune would add timing if I ran 93 octane fuel. Understand you can't comment on someone else's product ... but I am trying to understand, in general, what makes a tune octane-specific if the car already had the capability to adapt to different octanes.
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Old 12-23-2015, 04:02 PM   #19
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93 octane..

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Originally Posted by rcodemach1 View Post
I think it's odd they offer 87 tunes for the new 5.0's. They only offered 91 and 93 tunes for my Mach1. I'm told it is because the 4.6L 4v's require 91 octane from the factory. That is because the compression is a little higher (10:1) than the 4.6L 2v. Well, the new 5.0 has 11:1, doesn't it? Seems like they would only offer 91 and 93 octane tunes for the 5.0 as well.
most of the stations in Mississippi offer 93 octane..
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Old 12-23-2015, 06:53 PM   #20
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Hardone this thread is almost 4 years old lol
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Old 12-26-2015, 09:07 AM   #21
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Hardone this thread is almost 4 years old lol
Ha, had me fooled
I just realized this too since you pointed it out, and I was going to post what seemed relevant to now. anyway......
But to the OP, just come across the border to Texas, no shortage
of 93 octane.
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