Absolute Top speed in a 2012 GT - Ford Mustang Forum
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Old 07-09-2018 Thread Starter
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I have a 2012 GT and I have no governor or rev limiter. I have successfully hit about 165 before backing off because well, stangs dont handle so well at high speeds. So I was wondering what top speed would be possible with that car. I don't plan on ever going that fast again. I'm just curious what it's max is.

EDIT: I WAS NOT ON A PUBLIC ROAD. SO PLEASE DONT GIVE ME GRIEF!!!!

Edit: everything is stock except for rear suspension and control arms.

Edit 3: so I had a new trans installed. In which I replaced the rear end and driveshaft. I took it to the same place I tested before and topped out at 176.85. so I got my answer. Thank you all for your Input. Do with this info as you please.

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Last edited by Bbeach123; 02-21-2019 at 06:42 PM. Reason: More info
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Old 07-09-2018
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I have a 2012 GT and I have no governor or rev limiter. I have successfully hit about 165 before backing off because well, stangs dont handle so well at high speeds. So I was wondering what top speed would be possible with that car. I don't plan on ever going that fast again. I'm just curious what it's max is.

Not sure that deserves an answer, but it seems I've read that it is around 170, drag limited.


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Old 07-09-2018
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Not sure that deserves an answer, but it seems I've read that it is around 170, drag limited.
I don't know either, but there's nothing wrong with the question. Accurate information exchange is always good. That way, our law abiding users here won't feel the need to find out personally.
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Old 07-09-2018
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The 2014 GT will go really fast.

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Old 07-09-2018
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The 2014 GT will go really fast.
LOL my thoughts exactly


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Old 07-09-2018
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Originally Posted by Bbeach123 View Post
I have a 2012 GT and I have no governor or rev limiter. I have successfully hit about 165 before backing off because well, stangs dont handle so well at high speeds. So I was wondering what top speed would be possible with that car. I don't plan on ever going that fast again. I'm just curious what it's max is.
Should have just continued on and went for it. At that point you were already going to jail if you got caught. hahaha The difference in 165 and 175, 185, 195, 205, or hell 300 is no different. Going as fast as you were would land you in the back of a cop car for sure.

I wouldn't know this answer as my balls are not big enough to drive that fast for many reason like I don't like the idea of jail and don't like the idea of death. hahahah However with that said if I recall my 2011 GT Speedo didn't even go past 160. How you know you were doing 165? Most cars that are stock won't go faster than their speedos. Most won't get to the max as if it reads 160 then 155 would be my guess. Ironically after googling I find 155 in a few places for the 2012.

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Should have just continued on and went for it. At that point you were already going to jail if you got caught. hahaha The difference in 165 and 175, 185, 195, 205, or hell 300 is no different. Going as fast as you were would land you in the back of a cop car for sure.

I wouldn't know this answer as my balls are not big enough to drive that fast for many reason like I don't like the idea of jail and don't like the idea of death. hahahah However with that said if I recall my 2011 GT Speedo didn't even go past 160. How you know you were doing 165? Most cars that are stock won't go faster than their speedos. Most won't get to the max as if it reads 160 then 155 would be my guess. Ironically after googling I find 155 in a few places for the 2012.
Garmin GPS.
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Old 07-09-2018
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I prefer not to get into a discussion regarding the ethical considerations about high speed runs on public roads. Clearly they are best done on closed courses where public safety isn't a consideration. That said, there are no doubt some public roads where high speeds can be done without endangering anyone besides yourself. With that disclaimer out of the way here are some numbers to consider. All of these numbers unless otherwise stated are computed using a 27 inch diameter tire [ standard GT size ] and standard 3.31 rear end gears. I am also assuming that we are talking about a MT82 manual transmission and 5th. gear [ 1:1 ]. Assuming stock Gen 1 connecting rods and stock cams and valve springs I think 7,200 rpm is the maximum safe rpm limit. At 7,200 rpm top speed is 174.7 mph assuming that aerodynamic drag will allow it. Keep in mind that both aerodynamic down force [ which we don't have ] and aerodynamic drag of which we have a lot increase at the square of speed. Basically at these speeds it takes a big increase in power to get another 5 mph unless you find a way to reduce drag. My understanding is that the factory top speed limiter is set at 145 mph. With 3.31 gears 145 mph is 5,975 rpm, with 3.55's it's 6,408 rpm and with 3.73's it's 6,733 rpm [close to the factory rpm limit]. With 3.55 gears top speed at 7,200 rpm is 163 mph. With 3.73's and 7,200 rpm it's 155 mph. One last point. I think the speedometers/odometers on modern cars are much more accurate than the mechanically driven ones on older cars, but they still aren't perfectly accurate and the error tends to get worse as speed increases so don't take a high speed reading as being perfectly accurate.
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Old 07-10-2018 Thread Starter
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I was on a track. Dear Lord I would never go that fast on a public road.
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Old 07-10-2018
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662 hp in a 2013 body will get you 200mph.

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Old 07-10-2018
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662 hp in a 2013 body will get you 200mph.
203mph if its red.
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Old 07-10-2018
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I don't think I have ever seen an absolute answer on this, but my guess is the same as above, "about 170 MPH, drag limited"

and it absolutely would depend on gearing because you need to be right at the absolute top of the powerband when approaching the absolute top speed

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stupid computer won't let me like Mac's post so here it is:



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Quote:
Originally Posted by Bbeach123 View Post
I was on a track. Dear Lord I would never go that fast on a public road.
I have heard you can do it with no worries or issue on public roads in Mexico. haha I haven't been there to get the opportunity to try, but that is what I have heard and read on multiple sources. haha

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Old 07-10-2018
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Quote:
Originally Posted by Bbeach123 View Post
I was on a track. Dear Lord I would never go that fast on a public road.
Yeah, I'm guilty of jumping to a conclusion -- sorry!

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