How to achieve the factory 0-60 with Auto - Page 3 - Ford Mustang Forum
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I’ll reference this thread for the various equations.
https://www.allfordmustangs.com/forums/2011-2014-mustang-talk/634146-3-73-final-drive-what-exact-ratio-each-gear.html
This info is on many different forums. I found a spreadsheet on some site a while back that uses to do all the rmp/speed ratios. To determine the final drive ratios just multiply the transmission ratio x rear gear.
The manual
1st – 3.66
2nd – 2.43
3rd – 1.69
4th – 1.32
5th – 1
6th – 0.65

Automatic
1st – 4.17
2nd – 2.34
3rd – 1.52
4th – 1.14
5th – 0.87
6th – 0.69
Multiply these by the 3.15, 3.73, or 4.10 to get the final drive.

You can see that after 1st the automatic is set up to be more of a grand tourer than a sports car. Even with a 4.10 rear 3-5th is still steeper in the manual with 3.73s


btw, thanks for the wielding tip. I hadn't ran across that thread before

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The auto is totally is set up softer than the 3.73 MT but, that doesn't mean the 3.73 MT is the ideal setup. I had to run a 28" tire at the strip on my old 12 car, to keep the car under the limiter when crossing the stripe in fourth. This led to some slight compromises at the front end. It was good enough for and 11 sec 1/4 at 115 on a tune and tire but, if I could have used a 26 inch tire I would have had more tire choices and potentially more mph. I'd say the sweet spot is 3.55 on an MT, , no more than 3:31 on an auto, due to the crazy first gear. Adding a gear to auto may make the car feel more spirited in normal road operation but, as for measurably faster at WOT, I'm not convinced.

The auto I have now is definitely going to be over tired at 28" but, it's what is on my drag wheels and they aren't worn out. Hopefully the nitrous will help


2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto tune, 100 shot on BBR tune, best et: 11.38 at 120.85

2012 GT, Candy Red, Brembo, 3.73, Tech, Comfort, etc. Procal tune, Roush upper, UMI LCAs, Steeda red bracket, GT500s, 28X10X16 Hoosier slicks, best et: 11.91 at 115.23 RIP
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Quote:
Originally Posted by DOCinMD View Post
I’ll reference this thread for the various equations.
https://www.allfordmustangs.com/forums/2011-2014-mustang-talk/634146-3-73-final-drive-what-exact-ratio-each-gear.html
This info is on many different forums. I found a spreadsheet on some site a while back that uses to do all the rmp/speed ratios. To determine the final drive ratios just multiply the transmission ratio x rear gear.
The manual
1st – 3.66
2nd – 2.43
3rd – 1.69
4th – 1.32
5th – 1
6th – 0.65

Automatic
1st – 4.17
2nd – 2.34
3rd – 1.52
4th – 1.14
5th – 0.87
6th – 0.69
Multiply these by the 3.15, 3.73, or 4.10 to get the final drive.

You can see that after 1st the automatic is set up to be more of a grand tourer than a sports car. Even with a 4.10 rear 3-5th is still steeper in the manual with 3.73s


btw, thanks for the wielding tip. I hadn't ran across that thread before
This chart is flawed with the way you're reading it comparing the ratios of the auto and manual.

Trust me I have personal experience here. Going to a steeper rear gear in the auto is not the answer. Start with a good tune and go from there. The next step would be a converter. But no more than a 3.31 gear. It won't help at all. Many have thought differently only to later realize the error in their ways.

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Getting a sub-5 second 0-60 should not require any mods, no tune, no gears, nada. The 2013 GT with auto should be good for about 4.7s.

To the OP, what size/brand/model tires do you have? Also, as others have stated, the track app might not be accurate. Have someone time you with a stop watch. One more thing, are you testing on a good surface? Is it fresh black asphalt with no traction?

2012 Grabber Blue GT Premium, 6MT, 3:31, Brembo, Nav, Comfort pkg, backup camera.
Goodies: GT500 Mufflers, MGW Shifter, DSS AL Driveshaft, Bondra Clutch pedal extension
Tune: Bama 91 Octane V2 Performance Tune
Suspension: Steeda Ultralite Springs, Koni Yellows, Steeda HD Strut Mounts, Steeda UCA - lowered cars, BMR Adj. Panhard bar
Tires: Continental DWS06 275/40-19
Track Days: Bama 93 Octane Race Tune, 18x10 SVE Drifts with Bridgestone RE-11 285/30
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Quote:
Originally Posted by freewayflyer View Post
Getting a sub-5 second 0-60 should not require any mods, no tune, no gears, nada. The 2013 GT with auto should be good for about 4.7s.

To the OP, what size/brand/model tires do you have? Also, as others have stated, the track app might not be accurate. Have someone time you with a stop watch. One more thing, are you testing on a good surface? Is it fresh black asphalt with no traction?
I'm still on the factory Pirelli P-Zeros. Haven't really had much of a problem of losing traction with them though, I can generally stomp it and it only spins a bit even with all assists turned off (which strikes me as odd, I have lesser powered cars that will rip the tires off if I just stomp it from a dig but they're all FWD). Pavement has been decent that I've tried it on, no crappy beat up pavement or anything just smooth roads. Not freshly paved, but still smooth and pretty consistent.

2013 Silver Ingot GT Premium 6R80
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