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#21 |
dude5l
Join Date: May 2001
Location: Grande Prairie, Alberta, Canada
Posts: 603
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![]() One more thing to add to the " human with 50 lbs on his back " factor is fatigue. Engines won't experience this in one high speed run. ( they will over time though, Its called wearing out!
![]() ------------------ B.R. L.X. 5.0 coupe Cruise control,power mirrors,...and Thats it! |
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#22 |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() My '77 403 LeSabre w/ 2.83's &
L60's pegged out the 160 speedo, but that was a few years ago. Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!! |
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#23 | |
Registered Member
Join Date: Apr 1999
Location: Hayes, Va, USA
Posts: 798
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![]() Quote:
![]() Your analogy is correct if your are indicating it takes a certain amount of power to maintain a particular rate of acceleration. Throw your buddy in the car with you and you'll still have the same terminal velocity although it will take you longer to get there, throw him on the roof, and not only will it take you longer to get there, but you will also slow down (unless screaming buddies have some aerodynamic enhancing property not known to modern science ![]() |
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#24 |
Import Slayer
Join Date: May 1999
Posts: 2,241
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![]() stang runner, that 5200rpm was with an autometer tach.
I was hauling a$$ It took a long time to get stopped too...wow! |
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#25 | |
Registered Member
Join Date: Mar 1999
Location: Arcadia, CA, USA
Posts: 731
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![]() Quote:
More weight might may mean more rolling friction, but it has minimal effect on top speed. It just takes longer for the heavier vehicle to get to terminal velocity. ------------------ Russ L '91 LX Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles. |
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#26 |
The Dude
Join Date: Feb 2001
Location: Arlington, VA
Posts: 1,262
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![]() i'm not saying that it has a big effect, just that it does have an effect. if you don't trust me, go ask your college physics professor. i knew that the backpack thing was a bad analogy, just trying to get my point across.
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#27 | |
Registered Member
Join Date: May 2000
Location: Kamloops, BC
Posts: 2,875
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![]() Quote:
Weight has little to do with top speed. Although I guess if you got real picky you could argue that a higher downward force would contribute to higher frictional forces which would lower your top speed. But then again, the same would be true if you put on wider tires, softer rubber tires, etc. ![]() Unit has the correct analysis here. ------------------ 1995 Mustang GT |
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#28 |
Registered Member
Join Date: Oct 2000
Location: Ontario canada
Posts: 446
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![]() ok lets try this go to the top of a very steep hill now run down .drive ride take you time getting up be well rested put that 50lbs on now run down which will be faster ? my geuss me falling with the 50 lbs.
------------------ 89 with 395 single stage n2o .garret t3. 373's Suspention worked out finnaly . need cage . |
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#29 |
Registered Member
Join Date: Dec 1998
Location: Ft.Myers, FL.
Posts: 150
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![]() drag smag, he just wanted to know top speed of our vehicles, and if he has a limiter on his. chill pill time for some of us, i've had mine to 135 with more to go, that was fast enough for me 4:10's stock suspension 235/60/15 BTW isnt drag some rope sucker dressed in girls clothes
------------------ 89 Notch: ASP Pullies, K&N Air,Transgo shiftkit,Trans. cooler,FMS 3 core Radiator, FMS 4:10's, 1.5" cowl, cold air kit, hooker equal length shorties(jet hot coated), O/R H-Pipe, ASP solid mounts, Energy Sus. Trans. Mnt. BBK 70mm TB, MSD 6al, Dual elec. fans |
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#30 |
Registered Member
Join Date: Aug 1999
Location: Fairfax, VA
Posts: 220
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![]() According to my stock speedo, I was going just under the 140 mark (maybe 137) and could go no faster - I was in 5th gear and had been accelerating for about 3 miles chasing a buddy on a motorcycle (I did not catch him!). As for the limiter question, you probably don't have one, but even if you did, I don't see why you would need to remove it unless you found yourself hitting it.
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#31 |
Registered Member
Join Date: Oct 1998
Location: Rogers, MN
Posts: 2,089
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![]() Top speed has everything to do with the mass of your car. In order to reach top speed, you need to generate enough force to accelerate the mass of your vehicle to that velocity. Force = Mass x Acceleration.
Let's say that your engine can generate a constant force, which it can't do. The mass of your vehicle will remain constant. As the velocity of your vehicle increases, the force of drag on your vehicle will increase (quadruples for every time the velocity doubles). The force of drag can be subtracted from the force your engine is able to generate and then you can divide it by your mass to determine the rate of acceleration. Your acceleration will constantly decrease until, for all intents and purposes, it reaches zero. Now factor in the fact that engines don't generate a constant force and force drops off significantly at higher RPMs. ------------------ 351W 89 Mustang GT Convertible [This message has been edited by jimberg (edited 07-23-2001).] |
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#32 |
Import Slayer
Join Date: May 1999
Posts: 2,241
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![]() Actually, it doesn't really matter how fast your car can go. A better question would be "How fast can you drive?"
A car that can go 200mph means nothing if you don't have the guts or experience to drive that fast....correct me if I am wrong. Most people wouldn't be able to just hop into a Winston cup stock car and expect to go 200mph. These peolpe that buy these corvetts, Ferrari's and Porche's and brag about how fast their car is clocked at cracks me up! Let see those guys get out there and drive that fast. My money says a majority of them won't have the balls to go much faster then 140-150 if even that fast. ------------------ '82 GT 351W C-4,BBK headers,Carter 625 carb,Comp.Cam,Flowmaster exhaust. 1988 GT...T-5,bone stock |
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#33 | |
The Dude
Join Date: Feb 2001
Location: Arlington, VA
Posts: 1,262
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#34 | |
Registered Member
Join Date: Mar 1999
Location: Arcadia, CA, USA
Posts: 731
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![]() Quote:
![]() With a greater mass, acceleration is less. But the car will still accelerate until the power it delivers (force) equals the forces of aero drag + friction. ------------------ Russ L '91 LX Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles. |
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#35 |
Registered Member
Join Date: Oct 1998
Location: Rogers, MN
Posts: 2,089
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![]() Yeah, you're right. Sorry about that. I realized that when I thought about it more on the way home. But hey, it settled the argument.
![]() ![]() The backpack of weight argument is more akin to that of a parachute. Yes, if you add more weight to a parachute it will fall faster but that's because the added mass times the acceleration of gravity creates more force which in turn would create a higher terminal velocity. ------------------ 351W 89 Mustang GT Convertible |
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#36 |
Registered Member
Join Date: Feb 2001
Location: winnipeg , manitoba , canada
Posts: 83
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![]() i really dont want to carry this thing on but yes there is a governer on your car , if you have a 5 sp then its a two wire connector on top of the trans , its tripped by fifth gear , it limits the revs to 3800 in fifth , the other gears are only limited by the rev limiter of 6250. pull the connector off and have at it.
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#37 | |
Registered Member
Join Date: Apr 1999
Location: Hayes, Va, USA
Posts: 798
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![]() Quote:
but I digress ![]() I can see where drag/friction limits top speed, and the relativistic effects of accelerating the mass from one velocity to another would support the statement that mass is a limiting factor, however it seems to me that the speed attainable by most if not all vehicles niether have the mass or the speed to make mass by itself a consideration in limiting the top speed of the vehicle (hope that sounds right?) and aerodynamic forces (drag/friction) ultimately play the greatest role in limiting the top speed of a vehicle? |
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#38 |
Registered Member
Join Date: Oct 1998
Location: Rogers, MN
Posts: 2,089
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![]() MiracleMax, yeah, you had it right to begin with. Mass has nothing to do with top speed. It only determines the time that it takes to reach top speed.
------------------ 351W 89 Mustang GT Convertible |
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#39 |
Registered Member
Join Date: Apr 1999
Location: Hayes, Va, USA
Posts: 798
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![]() Well I gave the mass/velocity statement a thought, If say for instance your car was able to operate in a vaccum, and had unlimited gearing so that engine speed nor drag was an issue, then eventually the relativisitc mass of the vehicle would become so high, the power produced by the engine would be unable to accelerate the vehicle from one velocity to another. Making the statement true in the that mass does have an effect on terminal velocity, but only in the relativisitic sense.
On a more practical level a car or any car is unable to generate suffcient velocity through gearing or power, for mass to have a substantial effect on terminal velocity. Hence aerodynamic forces (drag/friction) are the limiting factor here on terra firma. I never dabled with physics in school, so I can't say if newtonian physics indicated an increase in mass as speed increased, but instead held mass as a constant depite the velocity of the vehicle. |
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#40 |
Registered Member
Join Date: Mar 2001
Location: Palm Harbor, FL
Posts: 208
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![]() I've had my stock '95 gt with 3:08's and 245/45's at 141 and it would go much higher than that, but due to the wind that day, th car was taking flight. I want to top out my car again when I get fresh ZR tires. Does anyone know if the SN95's computer limits top speed?
------------------ Blueneonman - '95 5.0L Mustang GT Convertible | K&N Custom Cold Air Intake | FMS 9mm Wires | Hollow Cats | Flowmaster 2 Chambers | BBK Subframes | 6-pt Rollcage | King Cobra Clutch | FMS Adjustable Clutch Cable | B&M Short Throw | Coolest Neon Lighting on a Mustang EVER! Homepage: http://www16.brinkster.com/blueneonman/ |
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