Speedometer

[95C1500]

Do I need to recalibrate my speedometer for a 4 inch spindle lift and 285/70r17 tires?

 

[am92]

Your speedo will read a little slow with the larger tires so if you want it to be accurate you'll need to have it recalibrated

 

[95C1500]

How much will it be off? is it worth the money to get a recalibrator?

 

[am92]

If you have 245s it will be around 7% off...if you have 265s it will be about 3.5% off with the new tires. Not worth getting recalibrated IMO, just keep it in mind when you're driving at highway speeds

 

[95C1500]

alright

 

[Rewind]

Here's a site that has a calculator. Plug in your OEM tire size and the new tire size and it'll tell you the difference in several areas, including how much your speedometer will be off.

http://www.tacomaworld.com/forum/tirecalc.php

 

[95C1500]

Is recalibrating something a shop can do or do I need to do it myself?

 

[Rusty Silence]

Here's a site that has a calculator. Plug in your OEM tire size and the new tire size and it'll tell you the difference in several areas, including how much your speedometer will be off.

http://www.tacomaworld.com/forum/tirecalc.php

Nice! bookmarked for future reference.

 

[95C1500]

Ok. I found this on summit racing:
http://www.summitracing.com/parts/JET-50108/
Does anyone know what this is or how hard this will be to install or how to install it?

 

[94.Sierra]

Under the photo there's a "instructions" button click it and then click on the pdf and it shows the instructions that will come with it. There will be a few wires to run and you'll have to remove the glovebox to access the vehicle speed sensor