GT Performance Mods 2005+ Mustang GT Performance and Technical Information

Stability at high speeds?

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Old 9/20/05, 01:19 PM
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I'll also add that I've had different tires from day one, so that may have something to do why it feels so good on rough roads at high speed, for me.

I don't know if I would want to do that with the stock Pirelli's
Old 9/20/05, 01:22 PM
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i have had not problem smoking g35`s...they can get you on the jump but from 1st to 2nd you pull right up on them and 3rd your pretty much gone...4th a blurry dot in your mirror...i beat one so bad he blew 2 lights just not to have to stop next to me
Old 9/20/05, 01:44 PM
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Originally posted by SixtySix@September 20, 2005, 1:30 PM
Seems to be a little misinformation going on here. I'll clear it up.

GT's are governed at 143, that's not a drag limit at all. It'll have no problem going 150+ without the governor. Drag limit will probably start to kick in at around 160.

V6's are governed at 115.

To the original question. It sticks like glue at very high speeds and is very stable. I've had it to 145 on some rather rough sections of highway and never felt out of control or even close to the edge at all.

My 72 year old father in law had it up that fast as well, and was doing S turns across both lanes of a crowned road. He loved it
I was wrong on the 143mph thing, but i did read correctly when I said the vehicle was drag limited, but at 147mph. I don't doubt that you got your car up that fast, just quoting a magazine... http://www.caranddriver.com/article.asp?se...0&page_number=4
Old 9/20/05, 01:51 PM
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Why set the limiter at 143 if it hits drag limitations at 147?
Old 9/20/05, 02:03 PM
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Originally posted by stang9325@September 20, 2005, 11:47 AM
That's true but some pondered that the higher gear ratio might be able to overcome the drag coefficient therfore netting a higher top speed
Ahh, I see, that's an interesting thought.
Old 9/20/05, 02:07 PM
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Originally posted by WERKED 66@September 20, 2005, 1:25 PM
they can get you on the jump
Really? I thought our massive torque would smoke them off the line...
Old 9/20/05, 02:38 PM
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Originally posted by stang9325@September 20, 2005, 12:47 PM
I was wrong on the 143mph thing, but i did read correctly when I said the vehicle was drag limited, but at 147mph. I don't doubt that you got your car up that fast, just quoting a magazine... http://www.caranddriver.com/article.asp?se...0&page_number=4

That says it all

I think C&D pulls stuff out of there poopshoot most of the time.

Look at the rest of the numbers and you'll see some whacky stuff as well.

I've had my car up beyond the indicated 145, but I don't know by how much, don't have any other device besides the speedo to gauge it.

It was still pulling and not showing signs of hitting a brick wall yet though.
Old 9/20/05, 03:01 PM
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I've noticed that the 05 GT isn't too stable at higher speeds. The car wanders and the suspension feels floaty. The hood also shudders around quite a bit, which makes me nervous. I've had the car up to 130ish my favorite strech of country road. It gets there quickly, but isn't the most confidence inspiring "illegal speed" car I have driven.
Old 9/20/05, 03:14 PM
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I've had no "floaty" problem with mine. But a couple of times going down the coast in a good wind, I've been real awake about the hood jumping around. Gets your attention real quick.
Old 9/20/05, 03:16 PM
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Originally posted by clockworks@September 20, 2005, 4:10 PM
Really? I thought our massive torque would smoke them off the line...
that`s the problem....you will usually spin a bit....thus they get a jump on ya...
Old 9/20/05, 03:24 PM
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The hood shake worries me too. Mine starts at speeds just over 100...makes me a little nervous.
Old 9/20/05, 03:30 PM
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Originally posted by jlb@September 20, 2005, 2:27 PM
The hood shake worries me too. Mine starts at speeds just over 100...makes me a little nervous.
If you are having that problem at 100, you can try adjusting the hood stops tighter and it should go away. Open the hood and you'll notice two adjustable stops. Turn them up so they meet the hood tighter. I havn't had a problem since I adjusted mine, but I havn't had it back to 135 since, so I don't know if it helps at that speed.


Paul
Old 9/20/05, 05:38 PM
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I had my bone stock GT to 145 by the speedo. No limiter hit there I just backed off. Stable and a rush. Got to tell you though I was more worried about the tires giving way than anything. There was plenty of throttle left and the engine purred like a kitten.
Does anyone know where the limiter speed is set at?
Old 9/20/05, 06:03 PM
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I have estensively test driven G35s. There is an inherent instability problem with the G35. You can really scare the &^% out of yourself because of it, especially when changing direction on a bumpy road, even at modest speeds.

Nissian recommends that you do not turn off it's stability control system (which isstandard). C&D, Autoweek and CR have all commented about the instability problem the G35 has. All of them sort of sluffed it off saying it's only a problem when you drive it at the limit. But those rags also said not to turn the stability system off.

If any US car like the Mustang had the same stability problems as the G35 has, the car rags would be screaming bloody murder, but somehow they give Nissian a free pass with this.
Old 9/20/05, 06:10 PM
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On a desolate desert hiway I got Natasha up to 175 mph and I know this because my buddy was on a Ducatti 996 pacing me...Drag limit my hieny...It was rock solid till about 160 and then it felt slightly "floaty", but not wild on the edge of death at all. I am not stock though.
Old 9/20/05, 06:23 PM
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Originally posted by clockworks@September 20, 2005, 12:24 PM
Correct me if I'm wrong, I'm new to modding, but don't higher ratio differential gears mean lower top speed, but greater acceleration?
Yes.. theoritically the auto with 3.31s should achieve a higher top end... Ive heard the Mustang is drag limited, and I have heard its governed.. no idea which is the truth.
Old 9/20/05, 06:28 PM
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Originally posted by V10@September 20, 2005, 7:06 PM
I have estensively test driven G35s. There is an inherent instability problem with the G35. You can really scare the &^% out of yourself because of it, especially when changing direction on a bumpy road, even at modest speeds.

Nissian recommends that you do not turn off it's stability control system (which isstandard). C&D, Autoweek and CR have all commented about the instability problem the G35 has. All of them sort of sluffed it off saying it's only a problem when you drive it at the limit. But those rags also said not to turn the stability system off.

If any US car like the Mustang had the same stability problems as the G35 has, the car rags would be screaming bloody murder, but somehow they give Nissian a free pass with this.
My friend has a 350Z and it has no stability problems, nor have I heard of this in the G35. Maybe you are talking about the bouncy ride, which is apparent on certain roads. Otherwise, it's a sports car with crisp turn-in. I can tell you that at the limit, the car is very safe; it understeers.
Old 9/20/05, 06:29 PM
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Originally posted by Thunder Road@September 20, 2005, 6:26 PM
Yes.. theoritically the auto with 3.31s should achieve a higher top end... Ive heard the Mustang is drag limited, and I have heard its governed.. no idea which is the truth.
From the factory mine was governed at 143 mph. They do that to keep within the speed rating of the factory equiped tire's and I'm sure insurance/liability issue's. As far as being drag limited I have already put that to the test along with many other's. I would imagine you would have to be going Indy car fast for that to be a factor or at least 200 mph + IMO.
Old 9/20/05, 06:37 PM
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Originally posted by Vegasjay@September 20, 2005, 7:13 PM
On a desolate desert hiway I got Natasha up to 175 mph and I know this because my buddy was on a Ducatti 996 pacing me...Drag limit my hieny...It was rock solid till about 160 and then it felt slightly "floaty", but not wild on the edge of death at all. I am not stock though.
Don't know how much the 05's speedo's are off, but you probably weren't anywhere near 175. There was an article a while back in C&D about top speed testing and speedo error. Most of them were off by a pretty large percentage. A more accurate way would be to use a hand held GPS.
Old 9/20/05, 06:49 PM
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Originally posted by max2000jp@September 20, 2005, 5:40 PM
Don't know how much the 05's speedo's are off, but you probably weren't anywhere near 175. There was an article a while back in C&D about top speed testing and speedo error. Most of them were off by a pretty large percentage. A more accurate way would be to use a hand held GPS.

At 175 his speedometer would be worthless anyhow. He was being paced. I thought that was clear in his post.


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