LS1TECH - Camaro and Firebird Forum Discussion

Drag Racing Tech
Sponsored by:
Sponsored by:

calculating mph for gear/tire combo?

   
Old 11-06-2007, 08:40 PM
  #1  
Motorboater
Thread Starter
iTrader: (53)
 
SilverGhost's Avatar
 
Join Date: Dec 2001
Location: Chi-town
Posts: 7,731
Likes: 0
Received 1 Like on 1 Post

Default 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?
SilverGhost is offline  
Reply Like
Old 11-06-2007, 08:45 PM
  #2  
10 Second Club
iTrader: (1)
 
1BADAIR's Avatar
 
Join Date: Jan 2003
Location: oxford, Michigan
Posts: 1,902
Likes: 0
Received 1 Like on 1 Post

Default
http://www.f-body.org/gears/
1BADAIR is offline  
Reply Like
Old 11-06-2007, 08:46 PM
  #3  
TECH Fanatic
 
chrismorales75's Avatar
 
Join Date: Oct 2007
Location: Ventura County, California
Posts: 1,129
Likes: 0
Received 0 Likes on 0 Posts
Default
Use this and enter in you stuff it will tell you

http://www.f-body.org/gears/
chrismorales75 is offline  
Reply Like
Old 11-06-2007, 10:01 PM
  #4  
Moderator
iTrader: (2)
 
FANTAZ28's Avatar
 
Join Date: Jan 2002
Location: THE CHI
Posts: 977
Likes: 0
Received 0 Likes on 0 Posts

Default
sean don't forget tire growth
FANTAZ28 is offline  
Reply Like
Old 11-07-2007, 06:14 AM
  #5  
9 Second Club NA
iTrader: (180)
 
Dragaholic's Avatar
 
Join Date: Mar 2003
Location: Houston, TX
Posts: 5,943
Likes: 0
Received 1 Like on 1 Post

Default
Or converter slippage which means will mph lower.
Dragaholic is offline  
Reply Like
Old 11-07-2007, 08:46 AM
  #6  
LS1Tech Co-Founder
iTrader: (34)
 
Pro Stock John's Avatar
 
Join Date: Nov 2001
Location: Chicago, IL
Posts: 44,647
Received 1,089 Likes on 717 Posts

Default
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.
Pro Stock John is offline  
Reply Like
Old 11-07-2007, 12:24 PM
  #7  
Teching In
 
Z28#107's Avatar
 
Join Date: Oct 2007
Posts: 21
Likes: 0
Received 0 Likes on 0 Posts
Default
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
Z28#107 is offline  
Reply Like
Back to Subforum
Drag Racing Tech
View Next Unread
race brakes worth it


Thread Tools
Search this Thread
Search this Thread:

Advanced Search

Advanced Search

All times are GMT -5. The time now is 08:56 PM.