Top speed run. Can this be right? - Page 2

blue00gt · 08-22-2001, 03:46 PM

The point that is being made is that if you take a given drivetrain from engine to tires, the speed of the tires is directly proportional to engine speed (with a manual tranny anyways), thus the speed of the vehicle can be calculated from engine speed. There are no terms for wind resistance, rolling friction, etc, because they are irrelevant to this equation. That is not the same as saying that these factors are not factors in determining a cars top speed.

Basically, if you know the engine speed, you know the speed of the car and it 'ams what it ams' regardless of its weight, COD, rolling resistance, etc.

exgmguy · 08-22-2001, 04:01 PM

Either way, it's haulin' balls.

------------------
1988 Mustang GT
11.8 @ 123 (7/14/01)
1992 BadAzz Wrangler
1993 Explorer

See my car at: www.mustangworks.com/cgi-bin/moi-display.cgi?179

08-22-2001, 04:23 PM

THX BLUEOOGT, that's what i thought, but just wanted to be sure...

yes it is hauling ***

------------------
Black,84 GT,ground effects,shorty headers, 'open' dual exh.,302 HO(no pollution control crap)bored .060,T5,89 ported heads,edelbrock Performer manifold, Edelbrock 2122 cam,600 Holley, high volume oil pump...

Some day (3:73 gears & N2O)!!!

will this ever end????

1BAD89 · 08-22-2001, 10:36 PM

HMM 175MPH, I DON'T KNOW...A guy on LS1.COM has a Twin turbo'd Z28 with a 6-speed and he has like 650rwhp with 3:73's and he tops out at like 186mph. Get a damn radar gun! WTF you had skinnies on when you did this?

------------------
1989 GT, 3:55's, full exhaust, 4 in. hood, Pro 5.0, etc... etc...

1989 Chevy S-10, EX. Cab-383(500+hp on motor), trick flow heads, trick flow pistons, etc... autometer phantom gauges, "built" 700R4, roll cage, lexan back window, corbeau seats, R.H.S. 5 harnesses, Fuel cell, convo pro wheels, 15x14's with 29x18.5 M/T'S on back, 15x4's on front, nitrous, and so much more!

http://www.geocities.com/i8urvpr/JM.html

gp001 · 08-23-2001, 12:00 AM

I offer this page as "enlightenment" on the issue. http://members.home.net/rck/phor/06-Speed.html

------------------
347 (Coast High short block), 279/284, TFS TW heads, Stealth, 750 Holley, Flowtech hdrs, Dr. Gas X, 2 Chmbr Flowmaster, MSD 6AL-Dist.& SS coil, March serpentine pulley system, Art Carr C-4 (Soon to be a Richmond 6 spd), Currie 9" w/3.50, alum Drv Shft, susp mods, Total Control subframes & tower braces, Trans Am Racing power dual master, 4 wheel disc, 17x8 Torqthrust II's
Something up my sleeve

In a 66 coupe

gp001 · 08-23-2001, 12:06 AM

P.S. the math says my Richmond 6 speed in 6 gear at 6500 says I can do 246.768 MPH, Think I can go that fast ?

sedanman · 08-23-2001, 12:09 AM

No matter what 5400RPMS in 5th with 3:73 gears is FLYING!!! I hope my car runs that well when I get the juice and the new motor done!

Skyman · 08-23-2001, 03:07 AM

Your crazy! I pushed 5000rpm in 5th with 3.73's and a 24.5" tire and that was fast enough for me!

Skyler

------------------
-1989 Saleen Mustang #406-
TFS TW Heads, E-303, Edelbrock intake, 70mm TB, 73mm MAF, 24lb injectors, 1 5/8 shorties, Off Road H, 3 Chamber flows, Jaz Race seats, Back seat removed, sub-frames, Roll Cage, and a 80 shot of N20.
12.54@107.4 Motor
332RWHP, 350rwtq

jimberg · 08-23-2001, 05:23 AM

According to my calculations, exgmguy was going 177 miles per hour.

Quote:

Originally posted by gp001:
P.S. the math says my Richmond 6 speed in 6 gear at 6500 says I can do 246.768 MPH, Think I can go that fast ?

If you were in 6th gear and you had an accurate tach that said you were doing 6500 RPMs, you would indeed be going 246.768 MPH. exgmguy didn't do 88.5 at 2700 RPMs and then just double it to figure if he can go 177. His engine was actually rotating at 5400 rpms.

------------------
351W 89 Mustang GT Convertible

topless tire fryer · 08-23-2001, 04:25 PM

Remember, NASCAR cars don't have speedos, the drivers calculate speed by the RPM's and gears. If it's good enough for NASCAR it should work for us.

You can take into account rolling friction, wind resistance and the amount of dust on the dashboard, but the diffrence between 170 and 180 mph isn't all that much. Nice run!

------------------
'95 Chrome Yellow GT ragtop, KN filter charger, Dynomax cat back, Accel plugs and wires.

exgmguy · 08-23-2001, 06:06 PM

That is with an Autometer tach too. If I went off the stock dash unit I would probably be going 90 mph.

wind resistance, etc.. does not change my gear ratio and tire size. All you have to do is hit the number on the tach in 5th and do the math. Simple as that.

See my car at: http://www.mustangworks.com/cgi-bin/moi-display.cgi?179

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08-22-2001, 03:46 PM	#21
blue00gt Mustang Addict Join Date: Jan 2001 Location: McKinney, TX Posts: 1,294	The point that is being made is that if you take a given drivetrain from engine to tires, the speed of the tires is directly proportional to engine speed (with a manual tranny anyways), thus the speed of the vehicle can be calculated from engine speed. There are no terms for wind resistance, rolling friction, etc, because they are irrelevant to this equation. That is not the same as saying that these factors are not factors in determining a cars top speed. Basically, if you know the engine speed, you know the speed of the car and it 'ams what it ams' regardless of its weight, COD, rolling resistance, etc.

08-22-2001, 04:01 PM	#22
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	Either way, it's haulin' balls. ------------------ 1988 Mustang GT 11.8 @ 123 (7/14/01) 1992 BadAzz Wrangler 1993 Explorer See my car at: www.mustangworks.com/cgi-bin/moi-display.cgi?179

08-22-2001, 04:23 PM	#23
jerryIII Guest Posts: n/a	THX BLUEOOGT, that's what i thought, but just wanted to be sure... yes it is hauling *** ------------------ Black,84 GT,ground effects,shorty headers, 'open' dual exh.,302 HO(no pollution control crap)bored .060,T5,89 ported heads,edelbrock Performer manifold, Edelbrock 2122 cam,600 Holley, high volume oil pump... Some day (3:73 gears & N2O)!!! will this ever end????

08-22-2001, 10:36 PM	#24
1BAD89 Tubbed and Juiced Join Date: Mar 2001 Location: Tulsa, Oklahoma Posts: 1,861	HMM 175MPH, I DON'T KNOW...A guy on LS1.COM has a Twin turbo'd Z28 with a 6-speed and he has like 650rwhp with 3:73's and he tops out at like 186mph. Get a damn radar gun! WTF you had skinnies on when you did this? ------------------ 1989 GT, 3:55's, full exhaust, 4 in. hood, Pro 5.0, etc... etc... 1989 Chevy S-10, EX. Cab-383(500+hp on motor), trick flow heads, trick flow pistons, etc... autometer phantom gauges, "built" 700R4, roll cage, lexan back window, corbeau seats, R.H.S. 5 harnesses, Fuel cell, convo pro wheels, 15x14's with 29x18.5 M/T'S on back, 15x4's on front, nitrous, and so much more! http://www.geocities.com/i8urvpr/JM.html

08-23-2001, 12:00 AM	#25
gp001 Registered Member Join Date: Nov 2000 Location: So. Cal. Posts: 244	I offer this page as "enlightenment" on the issue. http://members.home.net/rck/phor/06-Speed.html ------------------ 347 (Coast High short block), 279/284, TFS TW heads, Stealth, 750 Holley, Flowtech hdrs, Dr. Gas X, 2 Chmbr Flowmaster, MSD 6AL-Dist.& SS coil, March serpentine pulley system, Art Carr C-4 (Soon to be a Richmond 6 spd), Currie 9" w/3.50, alum Drv Shft, susp mods, Total Control subframes & tower braces, Trans Am Racing power dual master, 4 wheel disc, 17x8 Torqthrust II's Something up my sleeve In a 66 coupe

08-23-2001, 12:06 AM	#26
gp001 Registered Member Join Date: Nov 2000 Location: So. Cal. Posts: 244	P.S. the math says my Richmond 6 speed in 6 gear at 6500 says I can do 246.768 MPH, Think I can go that fast ?

08-23-2001, 12:09 AM	#27
sedanman Registered Member Join Date: Feb 1999 Location: Indianapolis, IN Posts: 963	No matter what 5400RPMS in 5th with 3:73 gears is FLYING!!! I hope my car runs that well when I get the juice and the new motor done!

08-23-2001, 03:07 AM	#28
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	Your crazy! I pushed 5000rpm in 5th with 3.73's and a 24.5" tire and that was fast enough for me! Skyler ------------------ -1989 Saleen Mustang #406- TFS TW Heads, E-303, Edelbrock intake, 70mm TB, 73mm MAF, 24lb injectors, 1 5/8 shorties, Off Road H, 3 Chamber flows, Jaz Race seats, Back seat removed, sub-frames, Roll Cage, and a 80 shot of N20. 12.54@107.4 Motor *332RWHP, 350rwtq*

08-23-2001, 04:25 PM	#30
topless tire fryer All show, some go 4 now! Join Date: Jun 2001 Location: Franklin, NH Posts: 175	Remember, NASCAR cars don't have speedos, the drivers calculate speed by the RPM's and gears. If it's good enough for NASCAR it should work for us. You can take into account rolling friction, wind resistance and the amount of dust on the dashboard, but the diffrence between 170 and 180 mph isn't all that much. Nice run! ------------------ '95 Chrome Yellow GT ragtop, KN filter charger, Dynomax cat back, Accel plugs and wires.

08-23-2001, 06:06 PM	#31
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	That is with an Autometer tach too. If I went off the stock dash unit I would probably be going 90 mph. wind resistance, etc.. does not change my gear ratio and tire size. All you have to do is hit the number on the tach in 5th and do the math. Simple as that. See my car at: http://www.mustangworks.com/cgi-bin/moi-display.cgi?179