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Discussing Drag Racing Gear Formulas in the Suspension Forum. Formula for max mph with gears: (tire height x rpm's) / (gear ratio x 335) ... Modded Mustangs is the premier Ford Mustang Forum on the internet. We discuss all aspects of the Ford Mustang on the forum. Registered Users do not see the above ads. Please Register - It's Free! |
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September 4th, 2005, 12:50 AM
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#1 |
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Hardcore Enthusiast
Join Date: Aug 2005
Location: Chesapeake, Virginia
Posts: 1,716
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Drag Racing Gear Formulas
Formula for max mph with gears:
(tire height x rpm's) / (gear ratio x 335) Formula to tell if you have the right ratio: ET x MPH= 1335, if higher than 1335 you need more gear, if lower you need less.
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88 Mustang Coupe 2006 FFW Richmond True Street Runner-Up www.rickscarcare.net http://img146.imageshack.us/img146/2158/ricksadql2.jpg |
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September 4th, 2005, 12:58 PM
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#2 |
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Regular
Join Date: Aug 2005
Posts: 150
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Hells yeah.
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July 12th, 2006, 07:02 PM
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#3 |
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Regular
2001 GT
11.9 @116
Join Date: Oct 2005
Location: waltham, mass
Posts: 350
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so that means i should replace my 4.10s with 4.30s or 4.56's?
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12.04 at 115mph with a 1.9 60' |
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July 12th, 2006, 07:11 PM
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#4 |
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I Post Entirely Way Too Much
1999 Ford Mustang V6
14.79 @ 92.15
Join Date: Aug 2005
Location: University of Georgia
Posts: 8,865
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I got 1370 with that formula, so I need 4.30s or 4.56's as well. For the street and since my car is also a DD, I am fine with my numbers.
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ModdedAutos 1999 Mustang V6 I used to list my mods here but stopped when I exceeded 255 characters. 
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July 12th, 2006, 10:41 PM
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#5 |
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Hardcore Enthusiast
Join Date: Aug 2005
Location: Chesapeake, Virginia
Posts: 1,716
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this chart doesn't take into effect many variables such as street operation. It is intended for determining an optimum gear ratio for racing only.
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88 Mustang Coupe 2006 FFW Richmond True Street Runner-Up www.rickscarcare.net http://img146.imageshack.us/img146/2158/ricksadql2.jpg |
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July 13th, 2006, 07:24 PM
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#6 |
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Regular
2001 GT
11.9 @116
Join Date: Oct 2005
Location: waltham, mass
Posts: 350
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yeah because im just finishing at the end of third and i don't want to go into 4th. i like my ratio now and i might need to go to 3.90s soon once i up the power.
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12.04 at 115mph with a 1.9 60' |
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November 4th, 2006, 12:04 AM
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#7 |
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Banned
Join Date: Jun 2006
Location: Bowling Green, KY
Posts: 3,833
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i know i need more gear anyway. LOL, mine was in the 1400s. stock gears arent good for dragging.
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November 4th, 2006, 01:51 AM
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#8 |
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Enthusiast
Join Date: May 2006
Location: El Paso, Tx
Posts: 855
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whats the magic number you put in the equation?
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"The gods too are fond of a joke." "If I had only known, I would have been a locksmith. " |
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December 12th, 2006, 06:25 PM
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#9 |
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Newbie
Join Date: Dec 2006
Posts: 2
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Gear ratio
I came up with 1412, I have a 3.73 gear and run a 28" tire. but the thing is Iam running a 460. I shift at 6500-6800. Think I need a 4.10 or 4.30 ?
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January 18th, 2007, 05:10 PM
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#10 |
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Newbie
Join Date: Jan 2007
Location: tennessee
Posts: 2
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WHAT ABOUT 1/8 MILE FORMULA!!
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March 11th, 2007, 12:16 PM
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#11 |
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Regular
Join Date: Jan 2007
Posts: 67
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Nice info, much appreciated.
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May 29th, 2008, 03:29 AM
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#12 |
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Newbie
Join Date: May 2008
Posts: 8
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i have a question if i have a 04 GT automatic could i install 4 10's or should i go with 3 73's? thanks
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