3.73 & 4.10 gear topspeed
09-27-2006, 11:18 PM
#11
3rd Gear Member
Join Date: May 2006
Location:
Posts: 700
RE: 3.73 & 4.10 gear topspeed
MBDiagMan,
Good point! I'm not sure...what we need to find is some dyno results for a Mustang with 4.10 gears, that should give us an idea. I'll look around on the web and see what I can dig up...
Agreed. Hands on testing is the only way to go.
Good point! I'm not sure...what we need to find is some dyno results for a Mustang with 4.10 gears, that should give us an idea. I'll look around on the web and see what I can dig up...
Agreed. Hands on testing is the only way to go.
09-29-2006, 12:46 AM
#12
4th Gear Member
Join Date: Jun 2006
Location: Maryland
Posts: 1,284
RE: 3.73 & 4.10 gear topspeed
Good point! I'm not sure...what we need to find is some dyno results for a Mustang with 4.10 gears, that should give us an idea. I'll look around on the web and see what I can dig up...
Agreed. Hands on testing is the only way to go.
Agreed. Hands on testing is the only way to go.
I'll be going next week. I will check back in!
09-29-2006, 09:46 AM
#13
3rd Gear Member
Join Date: Aug 2006
Location: North East Texas on the Red River
Posts: 886
RE: 3.73 & 4.10 gear topspeed
In 2000 thrugh 2002 I spent LOTS of time in Western Europe on business, with much of it being in Germany. In addition to that I lived in Germany 1969 to 1971 and more or less learned to drive there. As a result I am very frustrated when it comes to driving on the Interstates here in the US.
The Autobahns are much more crowded than they were in 69 to 71, but there are a few really nice stretches. The best that I drove on was between Frankfurt and Kaiserslautern. The road is reasonably straight with very light traffic. I cruised most of the way at 215KM per hour. There are other good stretches as long as you are away from the bigger cities.
I also drove from Eindhoven, Netherlands to Hamburg Germany one night and except for the congestion around the Essen/Dusseldorf area it was a pretty good drive. I was in a Ford Mondeo station wagon of all things, but it was a pretty decent Autobahn cruiser with 220 KPH being no problem.
Love that Autobahn. I sure would like to spend a few weeks with my GT or my Vette with nothing to do but drive.
The Autobahns are much more crowded than they were in 69 to 71, but there are a few really nice stretches. The best that I drove on was between Frankfurt and Kaiserslautern. The road is reasonably straight with very light traffic. I cruised most of the way at 215KM per hour. There are other good stretches as long as you are away from the bigger cities.
I also drove from Eindhoven, Netherlands to Hamburg Germany one night and except for the congestion around the Essen/Dusseldorf area it was a pretty good drive. I was in a Ford Mondeo station wagon of all things, but it was a pretty decent Autobahn cruiser with 220 KPH being no problem.
Love that Autobahn. I sure would like to spend a few weeks with my GT or my Vette with nothing to do but drive.
09-29-2006, 09:59 PM
#14
3rd Gear Member
Join Date: Feb 2006
Location: Fenton, MO.
Posts: 645
RE: 3.73 & 4.10 gear topspeed
ORIGINAL: wmtheflash
Well, I've had plenty of college level physics, although it has been awhile. There are way to many numbers that I don't know and can't find. I'm going to estimate.
Fdrag = 1/2 (drag coefficient * air density * surface area * Velocity Squared)
The gears are 4.10 vs. 3.55. That means torque would be multipled by about 14 or 15% at the rear wheels.
I suppose the force exerted would there would be about 15% greater...that means we need to calculate the speed that exerts 15% more on the object to reach terminal velocity. Assuming that 143 mph is the correct top speed stock (as quoted all over the internet). The V^2 term is killing you if the car goes 155 mph, then you've increased drag by 15% already. I'm not convinced that gears would make much of a difference.
These new Mustang have terrible drag coefficients, the GT500's drag coefficient is a sad 0.38, note that top speed is limited to 155 mph (electronically, but I wonder how well it handles at it's true top speed?).
http://www.autozine.org/html/Ford_USA/Mustang.html
A new Corvette Coupe has a drag coefficient of 0.286! My last peformance car was a 1971 Corvette, I sold it last year, it had a drag coefficient of 0.325. Heck, I did a little searching and found that a 2001 Honda Accord has a drag coefficient of 0.295. A 2004 Dodge Darango has a drag coefficient of 0.39...
The 2005+ Mustang body style is for looks, not for speed.
http://en.wikipedia.org/wiki/Drag_coefficient
Well, I've had plenty of college level physics, although it has been awhile. There are way to many numbers that I don't know and can't find. I'm going to estimate.
Fdrag = 1/2 (drag coefficient * air density * surface area * Velocity Squared)
The gears are 4.10 vs. 3.55. That means torque would be multipled by about 14 or 15% at the rear wheels.
I suppose the force exerted would there would be about 15% greater...that means we need to calculate the speed that exerts 15% more on the object to reach terminal velocity. Assuming that 143 mph is the correct top speed stock (as quoted all over the internet). The V^2 term is killing you if the car goes 155 mph, then you've increased drag by 15% already. I'm not convinced that gears would make much of a difference.
These new Mustang have terrible drag coefficients, the GT500's drag coefficient is a sad 0.38, note that top speed is limited to 155 mph (electronically, but I wonder how well it handles at it's true top speed?).
http://www.autozine.org/html/Ford_USA/Mustang.html
A new Corvette Coupe has a drag coefficient of 0.286! My last peformance car was a 1971 Corvette, I sold it last year, it had a drag coefficient of 0.325. Heck, I did a little searching and found that a 2001 Honda Accord has a drag coefficient of 0.295. A 2004 Dodge Darango has a drag coefficient of 0.39...
The 2005+ Mustang body style is for looks, not for speed.
http://en.wikipedia.org/wiki/Drag_coefficient
09-29-2006, 11:53 PM
#15
2nd Gear Member
Join Date: Dec 2005
Location: TX
Posts: 304
RE: 3.73 & 4.10 gear topspeed
The other thing that you have to factor in pragmatically here is that as speed increases on this car, you also have the added dimension of dynamic uplift. As compared to more aerodynamically engineered cars, the stock S197 has a crazy dynamic that increases to about 400lbs of uplift at 100mph.
Lowering the car, adding a functional chin and balancing the air flow (e.g. ram air to push or heat extraction to expel) will help (the GT500 I believe drops to about 100lb of lift at 100mph).
But even 100lbs is enough to create a significantly different profile which the formulae above do not take into account and something that a dyno run will mask.
Lowering the car, adding a functional chin and balancing the air flow (e.g. ram air to push or heat extraction to expel) will help (the GT500 I believe drops to about 100lb of lift at 100mph).
But even 100lbs is enough to create a significantly different profile which the formulae above do not take into account and something that a dyno run will mask.
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