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Higher Octane + ECU Reset = WOW!!!

dab86

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Ok so I live in Las Vegas and all we really have here is 91 octane fuel. I also have an X pipe and Roush Exhaust. I was never really thrilled about how the car ran. Sure it felt decently powerful but it wasn’t smooth at all. It felt jerky at times and not very responsive to heavy throttle. The higher the RPM's climbed the more sloppy it felt.

So today, I decided to try something. Luckily we have a few gas stations here that sell 100 octane race fuel. My tank was empty so I went to the station and filled up 4 gallons of 100 octane and 8 gallons of 91. This comes out to 94 octane. I drove home, parked the car, and disconnected the negative terminal on the battery and left it off for 45 minutes.

This car feels AMAZING now! It is 100 percent more smooth and so much more responsive! This car NEEDS 93 octane or higher fuel. If you are someone out west who runs 91 octane try and find some race gas to mix in. You will be floored on how much more smooth and responsive the car is especially at higher RPM's. It feels like a brand new car.

Even though my mods are just and exhaust and x pipe, maybe the computer still needs to be reset to truly adapt to them. Im also running a wide open grille which allows alot more air flow. Even the exhaust note sounds SOO much better. It doesn’t crackle and pop anymore. It is very smooth.

If you run 91 octane give this a shot and see what you think. I feel like I have a new car now and Im so happy! Only downside is 100 octane here is 8 bucks a gallon :(
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Khyber

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Lol
 

Excelerater

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Race gas makes everything nice :)

Being that these engines are 11:1 its no doubt that octane will wake it up,it can also
kill your cats so be warned,leaded fuel can harm emissions equipment sadly
 

Grimace427

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Race gas makes everything nice :)

Being that these engines are 11:1 its no doubt that octane will wake it up,it can also
kill your cats so be warned,leaded fuel can harm emissions equipment sadly

If he got the fuel from a gas station pump I doubt it's leaded. 100 octane can easily be unleaded.
 

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dab86

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If he got the fuel from a gas station pump I doubt it's leaded. 100 octane can easily be unleaded.
Correct...this was 100 Octane UNLEADED
 

Chameleon

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jasonstang

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I highly doubt you are seeing any difference using 100 vs 91 being such a normal compression 11:1.
What you are feeling different is probably some adaptive throttle response or if you have an automatic, shift points.
With that being said, if you guys have ethanol in 91, that can lower your performance.
 

50hhh

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For some reason people on this forum like to argue that theres no difference in octane making more power because "ford put 87 in the manual" but its simply not true. There is a noticeable difference in 93 with any 5.0 I have ever driven.
 

Old Car Guy

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That's.....

For some reason people on this forum like to argue that theres no difference in octane making more power because "ford put 87 in the manual" but its simply not true. There is a noticeable difference in 93 with any 5.0 I have ever driven.
That's what I have always noticed with my 2014 GT 5.0 Mustang, and my 2015 GT 5.0 Mustang, I have never seen the noticeable difference in useing 87 octane or 93 octane in the tank, my two cents worth on the the too fuels....:cheers:
 

BmacIL

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I do notice the engine response and mid-range torque improves on 93 vs. 87. Certainly there is no power difference that is detectable to butt dyno, but the engine does run a little better overall, and gets slightly better highway fuel economy.
 
 








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