Mustang GT Top Speed?

Grintch said:

You said 160+, which didn't do anything to prove that there wasn't a limiter at 165. But maybe Ford was smart and removed the limiter on German market cars?

I am confident that the standard 3.31s will get you to 165 faster than the 3.73s. Maybe you can still accelerate slowly in 6th with the 3.73, but it won't be optimum. And on say a road course shorter than the Nurburgring, 6th is too tall to be useful. Now on a 30 mile stretch of autobahn, it might be somewhat useful. But that gear is for fuel economy, not performance. Or do you think you can pull all the way to the theoretical 231 mph redline in 6th?

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I say 160+ because the speedo was pegged and I wasn't running a GPS. I went from 130 to 160 within a mile while running an A5. Your right about the 3.31's having a higher top end but the stock Performance Package with 3.73's is a better setup IMO and yes, 6th is useless on a road course.

I ran a buddy in his 13' Stang on the Bahn who I later found out went all the way to 4th when I rolled up on him in 6th without gearing down, didn't want the wife to know what was getting ready to happen. He had half a car length on me when we hit 140. He was surprised I ran the way I did without gearing down.

My car is American Spec. I have yet to see a Euro spec Stang with a Torsen differential...

Grintch said:

You said 160+, which didn't do anything to prove that there wasn't a limiter at 165. But maybe Ford was smart and removed the limiter on German market cars?

I am confident that the standard 3.31s will get you to 165 faster than the 3.73s. Maybe you can still accelerate slowly in 6th with the 3.73, but it won't be optimum. And on say a road course shorter than the Nurburgring, 6th is too tall to be useful. Now on a 30 mile stretch of autobahn, it might be somewhat useful. But that gear is for fuel economy, not performance. Or do you think you can pull all the way to the theoretical 231 mph redline in 6th?

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A 3.31 car may hit 165 faster than an untuned 3.73 car, but simply raising the limiter will get you to 165 in 5th on a 3.73 car. Stock for stock yes, tuned vs tuned, no.

My guess is 165 ish, the power, coefficient of drag limit the car. My 2005 C6 was supposedly good to 186, lighter, similar power, better coefficient of drag, geared properly but that was a stretch too, when stock.

I have an auto 2016 Mustang with 3:15 gears. Hit 152 before shutting it down and running out of road. Felt like it was done pulling at that point. All stock.

165 NA, 180 with a 150 shot of nitrous are my records right now.

V8EATR said:

A 3.31 car may hit 165 faster than an untuned 3.73 car, but simply raising the limiter will get you to 165 in 5th on a 3.73 car. Stock for stock yes, tuned vs tuned, no.

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Tuned vs tuned, the 3.31 is still going to give you a higher top speed.

7500 rpm only get you to 161.5 in 5th with 3.73's according to my gear chart. I wouldn't push it beyond that without some supporting mods. Plus remember, power peak is at 6500, and you need all the power you can get at 150+. The 3.31's will take you to 182 in 5th at 7500 rpm, though unless the tune adds a good bit of power (E85) I would be surprised if it would pull that far without hardware mods. Now 170-175, I can easily see with just a tune that raises the redline and removes the limiter.

Also remember that tire diameter is a factor in the effective gearing. Most of the road race/autocross guys (like me) are fitting shorter tires which further hurts the slightly too low geared PP.

P.S. I have a PP, so I am not just throwing rocks at other peoples choices.

I've got 3.31 in mine and had it up to 140 on I85. Still had more left

TheSushiChef said:

I have an auto 2016 Mustang with 3:15 gears. Hit 152 before shutting it down and running out of road. Felt like it was done pulling at that point. All stock.

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Non-PP is limited to 150.

jasonstang said:

Non-PP is limited to 150.

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155, actually.


http://www.torquenews.com/106/2015-...014-models-ecoboost-gets-surprising-top-speed

I've shifted into 6th around 145-150 and the car was still pulling pretty hard to 160, but I shut it down due to coming up on vehicles.

That's tuned, headers, CAI and the PP setup.

If I could have a S197 5.0 convertible w/ 3.31's to 167 and that's aerodynamic as a brick, I'm sure the S550 w/ 3.73's can do better.

armykyle1 said:

I've shifted into 6th around 145-150 and the car was still pulling pretty hard to 160, but I shut it down due to coming up on vehicles.

That's tuned, headers, CAI and the PP setup.

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Nice, a stock PP will do it as well...

TheDivaDanielle said:

If I could have a S197 5.0 convertible w/ 3.31's to 167 and that's aerodynamic as a brick, I'm sure the S550 w/ 3.73's can do better.

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S550 is only 3% more aerodynamic than the S197.

Sasuketr said:

S550 is only 3% more aerodynamic than the S197.

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Really? Huh, I would have thought more. My 2005 S197 GT was a brick.

daltron said:

Really? Huh, I would have thought more. My 2005 S197 GT was a brick.

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Yup. The S550 is still a brick but little bit shaved. The grill area is the problem. Too much contact area for the air to bounce back. Ford never released the cd coefficient but it should be around 0.35 range while cars like tesla and even honda civics are around 0.25 range.