new top speed

[DivineStrike]

Let me just quote and Bold all the electronically limited speed limits here for ya.

I believe they upped it to 123 or something like that. I do remember it's no longer 115 for the V6, but as others have said it's been posted.

Edit: Found it it's now 121

EB is limited to 121, same as the V6, unless it's equipped with the PP. Then it's limiter is upped to 145. Yes for the GT

Probably the reason they upped it to 145 on the PP. Although I am unfamiliar as to what tires are on the EB models. But considering the lowest Electronic limiter on the mustang is 121, the answer to your question would be yes.

DO NOT DO THIS WITH A V6.

The V6 has been limited to 113 mph; they've upped that to 121, I think? But people who removed the governor on 2011-2014 V6's found out really quickly why it was there in the first place -- somewhere between 125 mph and 135 mph, the one-piece drive shaft would explode.

There ya go Jimmy, and yes I agree with you on the V6 sort of. It's a new model and I would bet the EB and V6 have the same drive shaft. It would be cost effective to use the same as the EB and not create a new one for the V6. again PP EB is limited at 145 mph.

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[JoeDogInKC]

I believe it's 155 for the GT, not 145.

 

[JimmyTwoTimes]

There ya go Jimmy, and yes I agree with you on the V6 sort of. It's a new model and I would bet the EB and V6 have the same drive shaft. It would be cost effective to use the same as the EB and not create a new one for the V6. again PP EB is limited at 145 mph.

My understanding is that they're using the same one-piece drive shaft on the V6 that they have been using, and a two-piece on the EB. They have to have different driveshafts since the output shaft is a different distance from the rear differential with each engine (well, there are ways to get around that with adapters, but I doubt they'd do that).

 

[DivineStrike]

I believe it's 155 for the GT, not 145.

Sorry my "Yes for the GT" was in response to someone else who stated 155. So yes 155 is the limiter for the GT.

My understanding is that they're using the same one-piece drive shaft on the V6 that they have been using, and a two-piece on the EB. They have to have different driveshafts since the output shaft is a different distance from the rear differential with each engine (well, there are ways to get around that with adapters, but I doubt they'd do that).

Ah ok, good call. Didn't know that, however then it might be different than before as other drivetrain components have changed. Eitherway good info, thanks.

 

[EXP Jawa]

They have to have different driveshafts since the output shaft is a different distance from the rear differential with each engine (well, there are ways to get around that with adapters, but I doubt they'd do that).

Is that really true? I would expect that the rear face of block to be in the same place for each engine, so length variations go forward, not rearward. The differences would come from transmission length; if the EB and V6 share transmissions, then the prop shaft length would be common. At least I would guess that to be true...

 

[JimmyTwoTimes]

Is that really true? I would expect that the rear face of block to be in the same place for each engine, so length variations go forward, not rearward. The differences would come from transmission length; if the EB and V6 share transmissions, then the prop shaft length would be common. At least I would guess that to be true...

It's absolutely true with respect to the V8 and V6 -- I'm not sure precisely where the output shaft location on the Ecoboost is yet. There's a lot that goes into placement of engine blocks -- weight distribution, locating accessories, air flow, etc.

Again, EB's with two piece drive shafts should be fine. But this is what happens to your drive shaft on a V6 when you remove the governor (at least on the 2011-2014s):

 

[Lord Thunder]

I could swear I read somewhere the EB will have the same drive shaft as the GT, but that could be just the PP version.

 

[Trackaholic]

When this topic was discussed quite some time ago, the reasons given for the limiter was due to cooling capacity, not necessarily drivetrain.

So, the V6 had a lower limit because it has less cooling for things like the transmission and engine. (121 MPH)

EB without the PP was similar to the V6. (121 MPH)

EB with PP had more cooling and therefore could run at high speeds for a sustained time preriod. (145 MPH)

GT was slightly higher than that. (155 MPH)

The impression was that it would be possible to push the V6 and non-PP EB models to a higher top speed for brief periods, but depending on ambient temps, those speeds would not be sustainable. I don't recall a discussion about driveshafts becoming unbalanced, although that might still be possible, especially if they are the same as the previous generation's design.

I haven't tried to search for that old thread to see if my recollection is correct.

-T

 

[oyitsagreen]

Correct they changed them on 12 or 13 due to the breaking in 11s

What?? Curse you 13/14 model years !

I have the limiter removed on my 2011 V6 and i haven't dared go past 123 mph. I originally planned on getting an aluminum driveshaft but bought cat backs instead.



At that speed you start to feel a grinding/shaking from underneath the car. But at least it still pulls hard at that point...



And 155 mph is just fine for me. Not many places to go around here to safely reach that speed..maybe 135-140? ;)

 

[Sal JC]

What?? Curse you 13/14 model years !

I have the limiter removed on my 2011 V6 and i haven't dared go past 123 mph. I originally planned on getting an aluminum driveshaft but bought cat backs instead.

At that speed you start to feel a grinding/shaking from underneath the car. But at least it still pulls hard at that point...

And 155 mph is just fine for me. Not many places to go around here to safely reach that speed..maybe 135-140? ;)

Guess it's too late now since you're getting a '15.. but the aluminum really makes a big difference on the v6 for daily driving, it makes it much more responsive.

 

[1stWorldMustang]

Agreed. .. the V6 & Ecoboost Mustang should be limited to 130. The same as most 4 cylinder sedans

 

[DJGold]

121!! That sucks.

 

[oyitsagreen]

Guess it's too late now since you're getting a '15.. but the aluminum really makes a big difference on the v6 for daily driving, it makes it much more responsive.

Eh just Inner-Sibling rivalry . I'd say it's a good thing I had that fear, may have saved my life the one time I tried to push it!

And yep glad to not have to be worried about that this time around.

 

[OppoLock]

Driveshaft weight actually has a tangible effect on throttle response? First time I've heard that.

 

[EiBStudent]

Of course! The inertia of weight that the engine has to overcome to put power to the ground directly corresponds to the response time.

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