Interior Discussion about interior restoration, repairs, and modifications.

90 rs speedometer is 10-15 mph off

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Old Nov 11, 2010 | 12:04 AM
  #1  
palmer90rs's Avatar
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90 rs speedometer is 10-15 mph off

i have a 90 rs 305, the speedo is off too fast by 10 to 15 mph, whats up how do i fix it?
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Old Nov 11, 2010 | 12:08 AM
  #2  
Dartht33bagger's Avatar
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From: Oregon
Car: 1991 Z28
Engine: L31-R 350 w/ EBL P4
Transmission: 700R4
Axle/Gears: 2.73
Re: 90 rs speedometer is 10-15 mph off

The speedo in my car has been 5 MPH faster then I'm actually going since I got it. I just got used to driving it like that.
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Old Nov 11, 2010 | 12:27 AM
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Stephen's Avatar
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From: Bertram (outside Austin), TX
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: 90 rs speedometer is 10-15 mph off

Have you changed your wheels & tires from what the car came with STOCK? As in....The day it rolled out of the factory with?
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Old Nov 11, 2010 | 06:24 AM
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Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: 90 rs speedometer is 10-15 mph off

Originally Posted by Stephen
Have you changed your wheels & tires from what the car came with STOCK? As in....The day it rolled out of the factory with?
Or swapped the original rear end with one that has different gears?

JamesC
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Old Nov 11, 2010 | 02:16 PM
  #5  
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Re: 90 rs speedometer is 10-15 mph off

wheels are just 15x8 in the back, and to my knowledge its a stock rear end
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Old Nov 11, 2010 | 04:46 PM
  #6  
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From: Bertram (outside Austin), TX
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: 90 rs speedometer is 10-15 mph off

Originally Posted by palmer90rs
wheels are just 15x8 in the back, and to my knowledge its a stock rear end
What size TIRES though? That is what will really determine it, based on the overall diameter of them.
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Old Nov 11, 2010 | 11:40 PM
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Re: 90 rs speedometer is 10-15 mph off

if i remember right they are 215/65/15, they arent big tires at all
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