calculating mph for gear/tire combo?

Reply Subscribe

Thread Tools

Search this Thread

Nov 6, 2007 | 08:40 PM

SilverGhost

Thread Starter

Motorboater

iTrader: (53)

Joined: Dec 2001

Posts: 7,731

Likes: 1

From: Chi-town

calculating mph for gear/tire combo?

OK so I cross the traps at 6600-6700 this past sat on 28" tires.

all i need to know is how to figure out what i would cross at with 1" smaller tires, a 27" tire instead.

help?

Nov 6, 2007 | 08:45 PM

1BADAIR

10 Second Club

iTrader: (1)

Joined: Jan 2003

Posts: 1,902

Likes: 1

From: oxford, Michigan

http://www.f-body.org/gears/

Nov 6, 2007 | 08:46 PM

chrismorales75

TECH Fanatic

Joined: Oct 2007

Posts: 1,129

Likes: 0

From: Ventura County, California

Use this and enter in you stuff it will tell you

http://www.f-body.org/gears/

Nov 6, 2007 | 10:01 PM

FANTAZ28

Moderator

iTrader: (2)

Joined: Jan 2002

Posts: 977

Likes: 0

From: THE CHI

sean don't forget tire growth

Nov 7, 2007 | 06:14 AM

Dragaholic

9 Second Club NA

iTrader: (180)

Joined: Mar 2003

Posts: 5,943

Likes: 1

From: Houston, TX

Or converter slippage which means will mph lower.

Nov 7, 2007 | 08:46 AM

Pro Stock John

LS1Tech Co-Founder

iTrader: (34)

Joined: Nov 2001

Posts: 45,360

Likes: 1,791

From: Chicago, IL

Sean you have a 3.70, you can run that to 7000 according to the calculators to 158, but for your purposed mid 140's are fine for your current setup.

Nov 7, 2007 | 12:24 PM

Z28#107

Teching In

Joined: Oct 2007

Posts: 21

Likes: 0

Quote:

Originally Posted by SilverGhost

OK so I cross the traps at 6600-6700 this past sat on 28" tires.

all i need to know is how to figure out what i would cross at with 1" smaller tires, a 27" tire instead.

help?

I assume you want to know how-much the RPM will increase, switching from 28" tires to 27" tires, with everything-else remaining constant?

All you need is a $5 calculator:
28 divided-by 27 = 1.037

6600 x 1.037 = 6844

6700 x 1.037 = 6948

Reply Subscribe

Reply Share

First
Prev
1 / 1
Next
Last