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Old 03-20-2016, 12:14 PM   #1
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Tune questions

I see a lot of tunes say race tune 93 octane. Where I live mostly 91. Will I still get some good HP and Torque gains anyway? Also probably leaving the Ford cold air.What if you have a 91 tune and can only find 89=90 gas. This is something I find on some trips. Another question is my friend has a (Diablo I think) tuner for his Camaro and says it will work with my 2012 GT Mustang. Is this correct. When you have a tune is there any problem passing emission test? Or do you just put the factory tune back on. One more thing car is DD no track no mods so who has good gains with excellent reliability? Thanks.-
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Old 03-20-2016, 12:18 PM   #2
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I did an 11 sec 1/4 at 115 on a 91 tune and a sticky tire, on a 2012 so, yes, you will see some serious improvement.

You just drive a little easy, if you can't meet the octane requirement. I've run 87 in my high compression drag bike when stuck. Same with the 5.0. Don't rev it out or fully load it.

His tuner won't work. It needs to be set up for Ford hardware and it's married to his car. Buy an SCT X4 and a tune from a reputable company like VMP, LLund, JPC, Steeda or similar and jog on.

Emissions is no issue, unless you are tuning for no cats or similar.
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2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto N/A tune. 100 shot nitrous on BBR tune. Best e/t 11.42 at 120.64

2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP
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Old 03-20-2016, 05:13 PM   #3
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If your car is tuned for the grade of fuel generally available to you. Then you can drive however you like. You should research what variables influence the need for octane to better understand the answer(s) to your question.
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Old 03-20-2016, 05:28 PM   #4
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He said, "what if?".....

I had VMP write me 87, 91, and 94 tunes because I can get those grades locally. I'll be honest, I like the 91 tune best. It has the most torque potting around and the additives in the 94 locally sap a bit of its energy production, making the car feel a little soft up top.

I have a 100 shot nitrous tune as well, set up for 93. I will likely run 91 and use octane boost for those trips to the track, over using the pump 94.
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2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto N/A tune. 100 shot nitrous on BBR tune. Best e/t 11.42 at 120.64

2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP
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Old 03-20-2016, 10:36 PM   #5
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I don't disagree, hence my recommendation for him to understand octane rating.
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Old 03-20-2016, 11:07 PM   #6
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I didn't think he was confused but, Mebbe I'm wrong.
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Old 03-21-2016, 10:47 AM   #7
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Quote:
Originally Posted by WoodDA View Post
I see a lot of tunes say race tune 93 octane. Where I live mostly 91. Will I still get some good HP and Torque gains anyway? Also probably leaving the Ford cold air.What if you have a 91 tune and can only find 89=90 gas. This is something I find on some trips. Another question is my friend has a (Diablo I think) tuner for his Camaro and says it will work with my 2012 GT Mustang. Is this correct. When you have a tune is there any problem passing emission test? Or do you just put the factory tune back on. One more thing car is DD no track no mods so who has good gains with excellent reliability? Thanks.-
if you run a 91 Tune, it is not recommended for you to use 90 grade Octane Gasoline. You are confusing the computer and engine parameters and can potentially lead to damage. i am not saying that your engine will fail if this happens to you once or twice but it is possibility.

as far as emissions, i will let someone chime in. i always return to stock and drive 60 miles before taking an emission inspection, i have been told it will not pass.

Mods or no Mods, you should feel a slight increase in acceleration/Power feel.

i ran stock for 1 month and slapped on my 93 octane with the upgrades i have and the gains are very noticeable in my car. I run BAMA.
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Old 03-21-2016, 10:53 AM   #8
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You risk engine damage only if you thrash it with fuel under the recommended minimums. Even then, the knock sensors are crazy sensitive on this car and will just keep pulling timing until the thing stays safe. The risk here is very low, honestly. It's not a recommended practice but, if you're caught short miles from home, it's perfectly safe to run lower octane fuel gently without retuning, as long as your tuner isn't stupid with an 11:1 compression engine and dialed back the knock sensors or turned them off.

Emissions depends largely on readiness state. Generally things that lead to failure are not the tune but, things like O2 readiness or drive cycles. You're best served to give it a shot on the tune and see, provided you don't have a CEL showing and you've driven the car for over 100 miles or so since last tune. If it won't go, return to stock, if the stock tune supports the mods you have. Tuners will often shut off the rear O2s for cars with exhaust work and this will guarantee an non-readiness fail. Those things need to be on, if you have testing in your area and that limits your choices in exhaust work. No LTH for you.
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2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto N/A tune. 100 shot nitrous on BBR tune. Best e/t 11.42 at 120.64

2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP
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Old 03-21-2016, 11:19 AM   #9
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Pay attention to this info. It is of the good kind.
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Old 03-21-2016, 11:43 PM   #10
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Appreciate the answers.
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