gear ratio and speedo calibration

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Sep 6, 2005 | 09:26 AM

pittperson

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With 4.10 gears, how much will your speedo be off if you do not recalibrate to take into account the new ratio?

Sep 6, 2005 | 10:49 AM

Mongoose

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10 MPH

Sep 6, 2005 | 11:43 AM

pittperson

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Quote:

Originally posted by Mongoose@September 6, 2005, 12:52 PM
10 MPH

Quoted post

Really? That big of a difference? How do you calculate that?

Sep 6, 2005 | 02:02 PM

STANG_IT

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lol, drive along side a buddy who's driving the same speed.

Sep 6, 2005 | 07:23 PM

pittperson

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Quote:

Originally posted by STANG_IT@September 6, 2005, 4:05 PM
lol, drive along side a buddy who's driving the same speed.

Quoted post

ok, fair enough

Sep 6, 2005 | 07:34 PM

wild stray

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All you need is a buddy who is positive his speedo is accurate!

Sep 7, 2005 | 11:36 PM

Gearhead

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From: Washington

Quote:

Originally posted by pittperson@September 6, 2005, 8:29 AM
With 4.10 gears, how much will your speedo be off if you do not recalibrate to take into account the new ratio?

Quoted post

If your stock ratio was 3.55:1, then at 60 miles per hour you would have:
3.55/4.10*60 MPH Indicated = 52 MPH Actual.
You can also check your speed with a GPS.
You can also check your speed by holding a constant speed over 1 mile, then use this formula:
3,600/seconds to travel one mile = speed in MPH.