speedometer / comp reprogram for larger tires

[YotaChic]

I'm putting the lift on my 2000 4Runner this weekend. The next logical step is putting a little more beef on with some new tires. I'm most likely going from a 265/70/16 to a 265/75/16 (but my tire guy has a pretty sweet deal on some 285's that he has in stock... so that is also possibility) .

When my hubby got larger tires on his Dakota, he took it to the local Dodge dealership and for $40 got his computer reprogrammed for the tire size he was running. Yesterday he called our Toyota dealer to find out how much it would cost to get that done for the Runner. He was told flat out that they couldn't do that.

My question is this: What, if anything, do I do to adjust the computer / speedometer readings to run non-factory size tires?

Thanks in advance for the help!

[bamachem]

nothing short of spending ~$180 on a Superlift Speedometer Recalibrator and doing some wiring.

it's really not THAT bad. your speedo actually reads a little faster than what you're going w/ stock tires (if your truck was delivered to the dealer with 265/70's originally). w/ 265/75's, it's dead on. w/ 285/75's you're only about 4% above that. that's less than 3MPH at 70. (that means when the speedo indicates 67MPH, you're really doing 70MPH.)

[YotaChic]

Thanks Andy, great info. I figured it would be close, but didn't expect it to be that close.

Just curious, are you using the recalibrator?

[mastacox]

I would just buy a GPS unit and use that (especially if a recalibrator is $180). Then you have a sweet off-road tool too

[bamachem]

nope. i sure don't.

[xcmountain80]

Umm I

I would just buy a GPS unit and use that (especially if a recalibrator is $180). Then you have a sweet off-road tool too

have a GPS and I bought the recall tool. But heres the thing my GPS was $400+ so wouldn't it be cheaper to buy the recall unit? And I run 2 sets of tires so the SuperLift Tru speed calibrator kicks ass.

Aaron

[mastacox]

Umm I

I would just buy a GPS unit and use that (especially if a recalibrator is $180). Then you have a sweet off-road tool too

have a GPS and I bought the recall tool. But heres the thing my GPS was $400+ so wouldn't it be cheaper to buy the recall unit? And I run 2 sets of tires so the SuperLift Tru speed calibrator kicks *******.

Aaron

Well if you're getting a GPS, and you're willing to shop a bit, it quite easy to find a very nice used model for well under $100. Heck, you can get brand new ones for under $200 these days.

[xcmountain80]

Yeah not so much! especially considering the model. It depends what you want and need I ended up with a garmin 276C you wont find em I shopped for 8 months. Even after the release of the new models they still are the same price $400-$1000. Now granted for most a lesser unit will do, but for my needs this is the only one that was suited. Sure for $100 ish you can find some descent units.

Aaron