How much?
Thread Starter
Staging Lane
Joined: Jun 2004
Posts: 89
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How much? Well my rear-end **** out on me this week. So i am getting a new rear-end assmebly w/ 3.42 gears. So i was wondering how much will the new gears throw off my speedo. BTW i had 3.08's. Any info will be greatly apperciated thanks.
Teching In
Joined: Nov 2004
Posts: 38
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Just find out the percentage difference between stock gearing and the new gearing. This will give you the the percentage the speedo will be off.
For example I have an s2000. Stock gearing is 4.10 i installed a 4.77. Thus close to 16% difference. 4.77 divided by 4.10 = 1.1634 so basically a 16% difference when my speedo says 100 mph i'm really going 84 when my speedo says 50 mph i'm really going around 42 mph.
so 3.42 divided by 3.08 = 1.110 so you'll speedo will be off by 11%
For example I have an s2000. Stock gearing is 4.10 i installed a 4.77. Thus close to 16% difference. 4.77 divided by 4.10 = 1.1634 so basically a 16% difference when my speedo says 100 mph i'm really going 84 when my speedo says 50 mph i'm really going around 42 mph.
so 3.42 divided by 3.08 = 1.110 so you'll speedo will be off by 11%
