Gear Ratio or Speedo?
Thread Starter
Registered User
Joined: May 2007
Posts: 7
From: SW Florida
Gear Ratio or Speedo?
Folks:
I noticed since I got my 94 Z in the past month that my speedo seems to be reading slow compared to the other vehicles around me. I got out my trusty GPS to see if I could get an accurate comparison between the speedo and actual.
What I found was if I hold steady at about 50, the GPS reads approximately 60. If I go 60, the GPS reads 72.
Do you think this is a speedo issue or do you think the rear end had been replaced/regeared by a previous owner?
Thoughts?
Scott
I noticed since I got my 94 Z in the past month that my speedo seems to be reading slow compared to the other vehicles around me. I got out my trusty GPS to see if I could get an accurate comparison between the speedo and actual.
What I found was if I hold steady at about 50, the GPS reads approximately 60. If I go 60, the GPS reads 72.
Do you think this is a speedo issue or do you think the rear end had been replaced/regeared by a previous owner?
Thoughts?
Scott
Registered User
Joined: Jul 2001
Posts: 1,655
From: Jacksonville, FL
Compare your RPMs at actual 60 MPH and play with a calculator like www.f-body.org/gears/ Plug in different ratios until it matches. People change gears all the time. I went from 2.73 to 3.42 - but changed the setting in the PCM. You can also get the car in the air and see how many times the driveshaft turns/complete wheel turn - or pull the cover.
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