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Speedometer issue after tuning

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Old Sep 4, 2015 | 04:42 AM
  #1  
articman's Avatar
articman
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Joined: Sep 2015
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From: TX
Default Speedometer issue after tuning

Help!
I have a 2001 Mustang GT with all the goodies to go with the Procharger. Problem is I took it to a tuner to get all the hp I could. After dyno tune, the speedometer is way off! He showed me he entered the 3:73 gears ratio, and second and third try to correct was a fail! Speed sensor is new and recalibration kit, NO Luck!!! Any ideas?
Old Jun 21, 2018 | 11:45 PM
  #2  
8 ball's Avatar
8 ball
 
Joined: Feb 2018
Posts: 31
From: Tennessee
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Originally Posted by articman
Help!
I have a 2001 Mustang GT with all the goodies to go with the Procharger. Problem is I took it to a tuner to get all the hp I could. After dyno tune, the speedometer is way off! He showed me he entered the 3:73 gears ratio, and second and third try to correct was a fail! Speed sensor is new and recalibration kit, NO Luck!!! Any ideas?
I assume that 3:73 is the correct gear ratio installed in your car. What about tire size? Was the correct revolutions per mile entered? Tirerack.com has a rev/mile calculation tool.
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