Top Speed with 3.73 gears

vetteeatr · 01-31-2002, 10:40 AM

I went ot the analyzer and plugged in my 5100 RPM max i can get in 5th with my 3.73 and 26 diameter tires

It says i would be going like 155

Is this actualyl right or is my tire diameter to big i didnt veen check all i knwo is my tires are ont eh pony rims and they are taller then the stock ones

At teh same RPM with 2.73 however it says liek over 200MPH

I am pushing somewher around 300 horses at the rear wheels....

Do they gears really affect top speed?

Or is it the wind resistance that makes it stay aroudn 150?

THanks guys

5ohCOUPE · 01-31-2002, 11:35 AM

I have 3.73's and i have been a little over 150 in my car. I was actually at about 155. It took a while to get there but it will do it if you have the power. If i stayed in it longer I would have been able to do almost 160.

Stang Runner · 01-31-2002, 11:46 AM

What size tires you have and the Stock Tach is not very good Ithere

jimberg · 01-31-2002, 11:47 AM

Max speed is based on horsepower and aerodynamic. The calculator only determines how fast the car would be able to go in a vacuum. In your case, I would say 155 was about right. The 200mph would be impossible.

Stang Runner · 01-31-2002, 11:51 AM

Gears ALL MOST never Stop the stop speed well like a 4.10 or more will But the wind makes more of a Diff that the gears do Right at about 150-155mph the wind resistance realy comes in at there Any more and you will need more HP stock the Car Fox body have done 144-145mph long time to get there.

jimberg · 01-31-2002, 12:20 PM

Gears affect top speed since peak horsepower rpm is fairly constant. The higher the gear ratio, the faster you will exceed the max horsepower RPM. If horsepower remained constant throughout an infinite rpm range, then yes, gears would only affect how long it took to get there.

Stang Runner · 01-31-2002, 12:34 PM

What I am saying is You just need more Power But a gear swap is not going to give you like a 20MPH incress
like hiw going 5th at 5100 a gear chage will not make Much diff

95mustanggt · 01-31-2002, 02:59 PM

When I had my 2.73's and I was more stock, around the fastest I could go was 135-140 MPH. I could ownly use 4th gear, 5th gear and the stock HP just could not over come the wind resistance.

lx mike · 01-31-2002, 04:55 PM

3.73 will just allow you to use 5th gear as your top speed gear now. it won't affect you topspeed unless the rpm's change brings you down too far down on your horsepower curve. 5th gear with 3.73's is numericaly lower that 2.73 in 4th.

drudis · 02-01-2002, 02:44 PM

Go to the Video clips here on Mustangworks roadracing section.

I got one of me at MIS (dont wanna give away the numbers till you SEE the video).

chris91LX · 02-02-2002, 12:22 AM

Uh, where's the roadracing section on Mustangworks? I'd like to see the clip your talking about and the ones on your site are freakin huge.

exgmguy · 02-03-2002, 03:32 PM

I have had my 3.73 geared car to approximately 175 mph. But I do have 28" tires.

DZEE'S LX · 02-04-2002, 01:10 AM

155 is possible with 300 h.p.

I did the Silver State Classic Road Race in Sep 2000 and went through the official radar trap at 148.
At that time all I had was the stock motor (212 rwhp), Kenne Bell ram air, Pulleys. and stock H-pipe with Race Magnum mufflers.

It took 2 miles to get to that speed and that was absolutely all she had.

I completely agree with the wind resistance problem. Fox body cars are kinda like a brick compared to more slippery body styles. I had no windshield wipers, radio antenna, or front license plate. Had tape around headlights & windshield moldings. Also had 44 psi (cold)in all tires.

BTW bench racing is way safer than actually doing this. One slip-up or tire failure will most likely spell disaster for you and maybe somebody else.

Don't forget that speedos can be way fast or slow at high speed depending on how much you have changed tire height or gear ratios from stock.

DZEE'S LX · 02-04-2002, 09:58 AM

Oops, forgot to mention I was running 3.08 gears at the time. (I think that was a big part of this post

)
My 3.55's would now put me in a much better part of the hp curve.

drudis · 02-04-2002, 11:41 AM

Quote:

Originally posted by chris91LX
Uh, where's the roadracing section on Mustangworks? I'd like to see the clip your talking about and the ones on your site are freakin huge.

Try this direct link:
http://www.mustangworks.com/cgi-bin/...ing+1+5+1+0+12

01-31-2002, 10:40 AM	#1
vetteeatr Registered Member Join Date: Apr 2001 Location: Olney, Illinois, USA Posts: 212	Top Speed with 3.73 gears I went ot the analyzer and plugged in my 5100 RPM max i can get in 5th with my 3.73 and 26 diameter tires It says i would be going like 155 Is this actualyl right or is my tire diameter to big i didnt veen check all i knwo is my tires are ont eh pony rims and they are taller then the stock ones At teh same RPM with 2.73 however it says liek over 200MPH I am pushing somewher around 300 horses at the rear wheels.... Do they gears really affect top speed? Or is it the wind resistance that makes it stay aroudn 150? THanks guys

01-31-2002, 11:35 AM	#2
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	I have 3.73's and i have been a little over 150 in my car. I was actually at about 155. It took a while to get there but it will do it if you have the power. If i stayed in it longer I would have been able to do almost 160. __________________ 91 LX COUPE, 3.73 gears, 2 1/2 inch H-Pipe, 1 5/8 MAC long tube headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam,1.7 TFS Rockers, TFS Track Heat heads, TFS Track Heat intake, T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 190 GPH in tank fuel pump. And more to come.

01-31-2002, 11:46 AM	#3
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	What size tires you have and the Stock Tach is not very good Ithere __________________ Engine: steel mounts, Under drive pulleys, K&N, GT-40 Intake ported Lower, No power steering, No A/C, Mac cold intake, 65MM TB, 255 Fuel pump, 24's, AFR 165 58cc, Rocker Arms 1.7with the stock Cam, 1 5/8 short headers, offRoad X-pipe Drive Train: 3.55, T-5 with a Pro 5.0 shifter 12.656@107.71MPH See It at www.T-racing.com/mustang.htm

01-31-2002, 11:47 AM	#4
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Max speed is based on horsepower and aerodynamic. The calculator only determines how fast the car would be able to go in a vacuum. In your case, I would say 155 was about right. The 200mph would be impossible. __________________ 351W 89 Mustang GT Convertible

01-31-2002, 11:51 AM	#5
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	Gears ALL MOST never Stop the stop speed well like a 4.10 or more will But the wind makes more of a Diff that the gears do Right at about 150-155mph the wind resistance realy comes in at there Any more and you will need more HP stock the Car Fox body have done 144-145mph long time to get there. __________________ Engine: steel mounts, Under drive pulleys, K&N, GT-40 Intake ported Lower, No power steering, No A/C, Mac cold intake, 65MM TB, 255 Fuel pump, 24's, AFR 165 58cc, Rocker Arms 1.7with the stock Cam, 1 5/8 short headers, offRoad X-pipe Drive Train: 3.55, T-5 with a Pro 5.0 shifter 12.656@107.71MPH See It at www.T-racing.com/mustang.htm

01-31-2002, 12:20 PM	#6
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Gears affect top speed since peak horsepower rpm is fairly constant. The higher the gear ratio, the faster you will exceed the max horsepower RPM. If horsepower remained constant throughout an infinite rpm range, then yes, gears would only affect how long it took to get there. __________________ 351W 89 Mustang GT Convertible

01-31-2002, 12:34 PM	#7
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	What I am saying is You just need more Power But a gear swap is not going to give you like a 20MPH incress like hiw going 5th at 5100 a gear chage will not make Much diff __________________ Engine: steel mounts, Under drive pulleys, K&N, GT-40 Intake ported Lower, No power steering, No A/C, Mac cold intake, 65MM TB, 255 Fuel pump, 24's, AFR 165 58cc, Rocker Arms 1.7with the stock Cam, 1 5/8 short headers, offRoad X-pipe Drive Train: 3.55, T-5 with a Pro 5.0 shifter 12.656@107.71MPH See It at www.T-racing.com/mustang.htm

01-31-2002, 02:59 PM	#8
95mustanggt Registered Member Join Date: May 2000 Location: Kamloops, BC Posts: 2,875	When I had my 2.73's and I was more stock, around the fastest I could go was 135-140 MPH. I could ownly use 4th gear, 5th gear and the stock HP just could not over come the wind resistance. __________________ 1995 Mustang GT 20016 F150 Lariat Super Crew

01-31-2002, 04:55 PM	#9
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	3.73 will just allow you to use 5th gear as your top speed gear now. it won't affect you topspeed unless the rpm's change brings you down too far down on your horsepower curve. 5th gear with 3.73's is numericaly lower that 2.73 in 4th. __________________ Rice Haters Club Member #101

02-01-2002, 02:44 PM	#10
drudis Moderator Join Date: Dec 1999 Location: Livonia, MI, USA Posts: 1,194	Go to the Video clips here on Mustangworks roadracing section. I got one of me at MIS (dont wanna give away the numbers till you SEE the video). __________________ Darius Rudis, Moderator Corner Carvers Delight 1989 Mustang LX - Open Track Car http://www.dariusrudis.com

02-02-2002, 12:22 AM	#11
chris91LX Registered Member Join Date: Oct 1998 Location: Suburban Chicago, Hanover Park Posts: 695	Uh, where's the roadracing section on Mustangworks? I'd like to see the clip your talking about and the ones on your site are freakin huge.

02-03-2002, 03:32 PM	#12
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	I have had my 3.73 geared car to approximately 175 mph. But I do have 28" tires. __________________ 1988 Mustang GT stock bottom 302, C4 10.9 @ 128 with 8 psi of Novi 1000 boost!----STOLEN 1989 Mustang notchback Warmed up 306 with a Procharger.

02-04-2002, 01:10 AM	#13
DZEE'S LX Registered Member Join Date: Jan 2001 Location: Salt Lake City Posts: 117	155 is possible with 300 h.p. I did the Silver State Classic Road Race in Sep 2000 and went through the official radar trap at 148. At that time all I had was the stock motor (212 rwhp), Kenne Bell ram air, Pulleys. and stock H-pipe with Race Magnum mufflers. It took 2 miles to get to that speed and that was absolutely all she had. I completely agree with the wind resistance problem. Fox body cars are kinda like a brick compared to more slippery body styles. I had no windshield wipers, radio antenna, or front license plate. Had tape around headlights & windshield moldings. Also had 44 psi (cold)in all tires. BTW bench racing is way safer than actually doing this. One slip-up or tire failure will most likely spell disaster for you and maybe somebody else. Don't forget that speedos can be way fast or slow at high speed depending on how much you have changed tire height or gear ratios from stock. __________________ Spec Service (UHP), BFG G-Force KDW's, Turbo Coupe 3.55 rear w/disks, 73mm calipers, Stg 1 Twisted Wedges, TFS Street Intake, 70mm TB, E cam, Crane 1.7's, Aeromotive FPR, BBK 1 5/8 shorties, elec fan, FMS Al Radiator, Moroso Wires, Kenne Bell Ramair, March pulleys, Race Magnums, 190 lph Walbro, FMS Al Dshaft, D/S loop, MM 4point rollbar, FMS C spngs, strut tower brace, Tokico Illuminas, Prothane bushings, MM Lwr Conrol Arms, KB welded subs, Cervini Mach 1 hood/valence/side skirts/wing/airdam.

02-04-2002, 09:58 AM	#14
DZEE'S LX Registered Member Join Date: Jan 2001 Location: Salt Lake City Posts: 117	Oops, forgot to mention I was running 3.08 gears at the time. (I think that was a big part of this post) My 3.55's would now put me in a much better part of the hp curve. __________________ Spec Service (UHP), BFG G-Force KDW's, Turbo Coupe 3.55 rear w/disks, 73mm calipers, Stg 1 Twisted Wedges, TFS Street Intake, 70mm TB, E cam, Crane 1.7's, Aeromotive FPR, BBK 1 5/8 shorties, elec fan, FMS Al Radiator, Moroso Wires, Kenne Bell Ramair, March pulleys, Race Magnums, 190 lph Walbro, FMS Al Dshaft, D/S loop, MM 4point rollbar, FMS C spngs, strut tower brace, Tokico Illuminas, Prothane bushings, MM Lwr Conrol Arms, KB welded subs, Cervini Mach 1 hood/valence/side skirts/wing/airdam.

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