Drag Racing Gear Formulas

Twist 2 Go · September 3rd, 2005, 11:50 PM

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.

redsMULLT1 · September 4th, 2005, 11:58 AM

Hells yeah.

DILO2001GT · July 12th, 2006, 06:02 PM

so that means i should replace my 4.10s with 4.30s or 4.56's?

AtlanticBlue99 · July 12th, 2006, 06:11 PM

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.

Twist 2 Go · July 12th, 2006, 09:41 PM

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.

DILO2001GT · July 13th, 2006, 06:24 PM

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.

Tony_90fox · November 3rd, 2006, 11:04 PM

i know i need more gear anyway. LOL, mine was in the 1400s. stock gears arent good for dragging.

stang fanatic · November 4th, 2006, 12:51 AM

whats the magic number you put in the equation?

466ci89coupe · December 12th, 2006, 05:25 PM

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 ?

gameover00 · January 18th, 2007, 04:10 PM

WHAT ABOUT 1/8 MILE FORMULA!!

True2theHorse · March 11th, 2007, 11:16 AM

Nice info, much appreciated.

Barricade04 · May 29th, 2008, 02:29 AM

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

September 3rd, 2005, 11:50 PM	#1
Twist 2 Go Hardcore Enthusiast Join Date: Aug 2005 Location: Chesapeake, Virginia Posts: 1,716 iTrader: 0 reviews	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. __________________ 88 Mustang Coupe 2006 FFW Richmond True Street Runner-Up www.rickscarcare.net

September 4th, 2005, 11:58 AM	#2
redsMULLT1 Regular 93 GT Join Date: Aug 2005 Posts: 185 iTrader: 0 reviews	Hells yeah. __________________

July 12th, 2006, 06:02 PM	#3
DILO2001GT Regular 2001 GT 11.9 @116 Join Date: Oct 2005 Location: waltham, mass Posts: 357 iTrader: 0 reviews	so that means i should replace my 4.10s with 4.30s or 4.56's? __________________ 12.04 at 115mph with a 1.9 60'

July 12th, 2006, 06:11 PM	#4
AtlanticBlue99 I Post Entirely Way Too Much 1999 Ford Mustang V6 14.79 @ 92.15 Join Date: Aug 2005 Location: University of Georgia Posts: 8,854 Blog Entries: 1 iTrader: 0 reviews	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. __________________ ModdedAutos 1999 Mustang V6 I used to list my mods here but stopped when I exceeded 255 characters.

July 12th, 2006, 09:41 PM	#5
Twist 2 Go Hardcore Enthusiast Join Date: Aug 2005 Location: Chesapeake, Virginia Posts: 1,716 iTrader: 0 reviews	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. __________________ 88 Mustang Coupe 2006 FFW Richmond True Street Runner-Up www.rickscarcare.net

July 13th, 2006, 06:24 PM	#6
DILO2001GT Regular 2001 GT 11.9 @116 Join Date: Oct 2005 Location: waltham, mass Posts: 357 iTrader: 0 reviews	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. __________________ 12.04 at 115mph with a 1.9 60'

November 3rd, 2006, 11:04 PM	#7
Tony_90fox Banned Join Date: Jun 2006 Location: Bowling Green, KY Posts: 3,803 iTrader: 0 reviews	i know i need more gear anyway. LOL, mine was in the 1400s. stock gears arent good for dragging. __________________ [SIGPIC][/SIGPIC] [B][U]MM Sapper Squad[/U][/B] [QUOTE=Regency 2007;1676187]MSO's stupidity has never stopped amazing me since the day he joined this forum.[/QUOTE]

November 4th, 2006, 12:51 AM	#8
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 861 iTrader: 0 reviews	whats the magic number you put in the equation? __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

December 12th, 2006, 05:25 PM	#9
466ci89coupe Newbie Join Date: Dec 2006 Posts: 2 iTrader: 0 reviews	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 ?

January 18th, 2007, 04:10 PM	#10
gameover00 Newbie Join Date: Jan 2007 Location: tennessee Posts: 8 iTrader: 0 reviews	WHAT ABOUT 1/8 MILE FORMULA!!

March 11th, 2007, 11:16 AM	#11
True2theHorse Regular Join Date: Jan 2007 Posts: 67 iTrader: 0 reviews	Nice info, much appreciated.

May 29th, 2008, 02:29 AM	#12
Barricade04 Newbie Join Date: May 2008 Posts: 8 iTrader: 0 reviews	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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Drag Racing Gear Formulas

Drag Racing Gear Formulas

Gear ratio