rear gears
Thread Starter
Race Director
Joined: Jan 2003
Posts: 14,285
Likes: 0
From: Houston, Tx Got traction?
CI 5-6-7-8-9-10 Veteran
St. Jude Donor '07-'08
rear gears
I am thinking about changing my rear gear ratio. However how would the gears affect me at the quarter mile track? I am running an MN 12, what would my top mph be in 4th gear?
3.42's
3.73
3.90
4.10?
Thanks in advanced!
I am also planning on using the DTE brace, any other must have parts?
Chris
<edit> assuming stock size tires
3.42's
3.73
3.90
4.10?
Thanks in advanced!
I am also planning on using the DTE brace, any other must have parts?
Chris
<edit> assuming stock size tires
Melting Slicks
Joined: Feb 2002
Posts: 2,613
Likes: 0
From: Winston Salem NC
With 4.10's if you hit 121mph it would be 6500 rpm's.
[IMG]http://www.smokemup.com/auto_math/mph_range.php[/IMG]
You can calculate here.
[IMG]http://www.smokemup.com/auto_math/mph_range.php[/IMG]
You can calculate here.
Thread Starter
Race Director
Joined: Jan 2003
Posts: 14,285
Likes: 0
From: Houston, Tx Got traction?
CI 5-6-7-8-9-10 Veteran
St. Jude Donor '07-'08
That site requires a password, any other sites? Sounds to me like 4.10's wouldn't be a very wise move with 3.42's trapping 117 and i'm hoping to ad more power very shortly
Thread Starter
Race Director
Joined: Jan 2003
Posts: 14,285
Likes: 0
From: Houston, Tx Got traction?
CI 5-6-7-8-9-10 Veteran
St. Jude Donor '07-'08
Ok, so i found a site and have the results. I calculated my new tire is going to be 315-30-18's is going to be a lower tire than my current diameter. Currently with stock 3.42's and stock size tires i'm trapping between 116 and 117mph, If i were to upgrade gears i would be raising my mph by a few correct? And calculating that and the possiblity of spraying the car or adding heads or a bigger bottom end, i should plan for at least 125mph in 4th gear....therefore the 4.10's would be too big of a gear and i'll need to stick with the 3.73's? That being said, will the 3.42 to 3.72 change be a big enough jump?
Melting Slicks
Joined: Feb 2002
Posts: 2,613
Likes: 0
From: Winston Salem NC
Originally Posted by stangkiller18
Ok, so i found a site and have the results. I calculated my new tire is going to be 315-30-18's is going to be a lower tire than my current diameter. Currently with stock 3.42's and stock size tires i'm trapping between 116 and 117mph, If i were to upgrade gears i would be raising my mph by a few correct? And calculating that and the possiblity of spraying the car or adding heads or a bigger bottom end, i should plan for at least 125mph in 4th gear....therefore the 4.10's would be too big of a gear and i'll need to stick with the 3.73's? That being said, will the 3.42 to 3.72 change be a big enough jump?
