Speedometer inaccuracy

GZE_RA21
Club4AG Enthusiast
Posts: 107
Joined: Sat Jan 16, 2016 6:19 pm
Location: San Clemente, California
Contact:

Speedometer inaccuracy

Postby GZE_RA21 » Fri Apr 26, 2019 12:54 am

What's up C4AG?

I recently did a W58 swap into my blacktop Corolla and the speedo is way off, 25% approximately, ie traveling 75mph when the speedo says 100mph. So prior to the W58 I removed the gauge cluster and dialed it back as much as it would go which made the T50 perfectly accurate as the speedo was reading high when I got the car. Since the speedo cable plugs into the T50 and W58 the same, I tried swapping the drive gears on them, but unfortunately they are very different.

So my question is, is there any known W series speedo drive gear with a different ratio or tooth count that would remedy this?

Or any other possible solutions?

Thanks!

aukword1
Club4AG Expert
Posts: 485
Joined: Fri Dec 06, 2013 6:03 pm

Re: Speedometer inaccuracy

Postby aukword1 » Fri Apr 26, 2019 8:23 am

You would need to swap the speedo gear. SQ engineering has several options available

https://www.sq-engineering.com/product/ ... edo-drive/

Also, wheel size also affects the speedometer if you want to experiment with different sizes.

GZE_RA21
Club4AG Enthusiast
Posts: 107
Joined: Sat Jan 16, 2016 6:19 pm
Location: San Clemente, California
Contact:

Re: Speedometer inaccuracy

Postby GZE_RA21 » Thu May 02, 2019 12:32 am

Many thanks! Shoulda figured SQ had something like that.