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i just put some 93 octane gas in my gt.about a quarter of a tank. when it goes empty im gonna fill up with 93 and change over from an 87 octane tune to the 93 octane tune. my question is, will i have to reset my tune for my 3.73 gears and non-stock tires to correct my speedo? or will that info go in with the 93 octane tune? thanks.
 

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you have to change those settings yourself. atleast with the Diablosport its very easy to do.
 

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Good question. I think you will have to put in the new tune. Depanding on who you bought your tuner from you could call them or SCT or Diablosport.
 

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I think it's just as simple with the SCT to just change that setting for the gears, but I'd call your tuner just in case since I have never done that.
 

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All the tunes should be built the same. If you have doubts you can always manually input the gear ratio and tire revs and it'll override whatever is in there.
 
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