91 To 93 Difference

[08v6]

So I Put In 93 Tune And I Swear The Car Isnt As Fast As It Was With A 91 Tune....It Feels Fast....And As Smooth As My Wifes A** But It Feels Like I Am Driving A Fast Lincoln With Bad gas Milage Not A Mustang, I have A u7145....Why Is This?

[concoursd]

Are you using 93 octane fuel? Are you hearing any pinging? If pinging occurs it will compensate by pulling spark timing and reducing performance.

[mikel]

What octane fuel is inthe tank?

[08v6]

94 Octane

[mikel]

Is there a CAI on this car?

[08v6]

yes, an AEM Brute Force And A BBK 70mm TB

[mikel]

OK, well, theres the issue, you need to at least be running one of the CAI tunes.

[08v6]

What kind Of Octane Are In THe CAI Tunes?

[FourSix]

It can likely be tuned for either 91 or 93. The 05+ models are very sensitive to any intake changes, and the computer needs to be re-calibrated in almost all cases for it to run properly. It's not so much an octane adjustment as it is a parameters adjustment, but a higher octane (93 vs. 91 octane) tune will allow for more timing.

[autobot04]

Does this also apply to a 2000 Mustang GT with a CAI?

[FourSix]

Does this also apply to a 2000 Mustang GT with a CAI?

No, it does not. You can do all the bolt ons in the book for a pre-2005 GT and not "have" to tune it. It will definitely benefit from a tune at that point though.

[08v6]

So I Ran The JLT Tune....The Wrench Light came On, And it Sputered And Stalled And Would Barely Run Before It sputtered And Stalled Again.....So I Just Put Back In The Normal 93 Tune......Couldnt I Just Increase The Maf Curve On The 93 Tune or Something?

[mikel]

Your best bet would be to get a custom tune for that AEM intake, or look into an intake that is supported by the Predator.

[concoursd]

keep experimenting with MAF curve and other CAI tunes with that odd ball intake. you will eventually get a nice sweet spot. Or, if you are not into the trial and error process, get a custom tune from a cmr dealer like mike (tuningss)

[hans2]

more advance does not always mean more hp or torque. The optimum tq curve (0) sits in a range of 5 degrees. so -21/2 >0< +21/2. In this range its almost impossible to tell the difference. If you sit at the high end of that range however, the engine feels much more stressed. I agree with you, and that is also my own experience, that in most cases the 91 tune wih a CAI like i.e. Steeda gives at least the same power, but feels much more "lose" less disstressed.

Hans