Need a gear ratio calculator
Thread Starter
Race Director
Joined: Oct 2000
Posts: 11,891
Likes: 3
From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg
Need a gear ratio calculator
I did a search on Yahoo and all I got were 4wd sites.
I need to figure out what what gears I have.
If someone wants to do the math: 4th gear, 30mph @ 2200rpm with 255/60/R15 tires. My car is a 1980 4 speed.
Or just give me a good link.
I need to figure out what what gears I have.
If someone wants to do the math: 4th gear, 30mph @ 2200rpm with 255/60/R15 tires. My car is a 1980 4 speed.
Or just give me a good link.
Le Mans Master
Joined: Sep 2000
Posts: 5,635
Likes: 4
From: Orlando Floriduh
Re: Need a gear ratio calculator (Ak. Mal)
try http://www.tirerack.com or http://www.idavette.net
[Modified by bluevetteman, 4:14 PM 11/7/2003]
[Modified by bluevetteman, 4:14 PM 11/7/2003]
Racer
Joined: Sep 2002
Posts: 462
Likes: 1
From: York PA
Thread Starter
Race Director
Joined: Oct 2000
Posts: 11,891
Likes: 3
From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg
Re: Need a gear ratio calculator (76Frankenstein)
76Frankenstein,
Thanks, but I'd be lieing if I said I knew how to use that.
Thanks, but I'd be lieing if I said I knew how to use that.
Racer
Joined: Sep 2002
Posts: 462
Likes: 1
From: York PA
Re: Need a gear ratio calculator (Ak. Mal)
Enter your tire size at the top, and click on the arrows to select your tranny type (at left of sheet). Select the speed desired by clicking on the rpm@speed arrows (far right column). Read the rpm@speed column while clicking the rearend arrows until you get a match to the rpm you are seeing. The rearend ratio will be displayed next to the arrows. It sounds harder than it is, just play around with the arrows, you'll see what is happening :D
Melting Slicks
Joined: May 1999
Posts: 2,897
Likes: 0
From: Moon Township PA
Re: Need a gear ratio calculator (Ak. Mal)
Thread Starter
Race Director
Joined: Oct 2000
Posts: 11,891
Likes: 3
From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg
Re: Need a gear ratio calculator (GaryS)
I'm beginning to doubt the accuracy of the speedo and tach. A previous owner had changed the speedo to the 140mph from a '79. I'm hoping they didn't change the speedometer cable gears.
If they are accurate, I've got some really tall gears. Based on three different calculators I've tried, I have about a 5.893:1 rear end. First off, do they even make gear ratios that tall? Second, why the hell would anyone ever want a gear ratio like this that wasn't into offroad rock crawling???
If they are accurate, I've got some really tall gears. Based on three different calculators I've tried, I have about a 5.893:1 rear end. First off, do they even make gear ratios that tall? Second, why the hell would anyone ever want a gear ratio like this that wasn't into offroad rock crawling???
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Racer
Joined: Sep 2003
Posts: 420
Likes: 1
From: Indianapolis IN
Re: Need a gear ratio calculator (Ak. Mal)
Have a friend drive next to you and tell you your speed. Sounds flaky if you're doing everything right. At that ratio your top speed would be maybe 75 or 80 Mph. I think I remember seeing a kit to make the 140Mph work somewhere, sounds like you need one.
[Modified by blunsford, 4:36 AM 11/8/2003]
[Modified by blunsford, 4:36 AM 11/8/2003]
Race Director
Joined: Jan 2003
Posts: 15,176
Likes: 88
From: State of Confusion
Re: Need a gear ratio calculator (Ak. Mal)
If you can't find a friend to 'pace' you (HIS speedo might be off, too!), try finding a stretch of marked' highway, with mile-posts.
Drive at varying RPMs until you click 'em off in 60 tics (seconds); this is 60 MPH.
When you know your RPMs @ 60 MPH, let me know.....
Drive at varying RPMs until you click 'em off in 60 tics (seconds); this is 60 MPH.
When you know your RPMs @ 60 MPH, let me know.....
Racer
Joined: Apr 2003
Posts: 486
Likes: 0
From: Point Pleasant NJ
Re: Need a gear ratio calculator (Glensgages)
Oh Frankenstien... Oh... the excel sheet again...
I still love it... Just needs more more more more more... hehe...
Should start a new thread dedicated to it again see how many peeps chime in for calculation info.
I still love it... Just needs more more more more more... hehe...
Should start a new thread dedicated to it again see how many peeps chime in for calculation info.
