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larger tires, slower speed!

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Old 04-05-2010, 02:40 PM   #1
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larger tires, slower speed!

I put larger tires on my Tacoma, and as a result my speed is different then actual.

How can the speedometer be adjusted for the new size tire?
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Old 04-05-2010, 02:48 PM   #2
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can't... need scanguageII... I have same dilemma
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Old 04-05-2010, 02:50 PM   #3
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Same thing for me. I just use my GPS but I dont really care anyways as long as im in the general MPH's I want to be in.
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Old 04-05-2010, 02:58 PM   #4
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there is one way (albeit a very sketchy way).

In my old '98 4Runner, I pulled out my gauges to do some work on the gauge face. To do that, you first need to pull off the needle. When pulling off the needle, you need to mark at what point the needle drops to (there should be a needle "rest" at 0 mph...if you remove it, the needle will drop a past the rest and stop.) You have to remember to put the needle back on at this exact point when putting your gauges back together.

The last time I did this, I forgot to mark where the needle stopped. I guesstimated, and after I put everything back together, my speedometer was under by 5 mph. You can technically do this to compensate for the larger tires, but it requires alot of tedious work and trail-and-error.
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Old 04-05-2010, 03:22 PM   #5
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^ pretty sure that will not work with newer technology... when i did my dash mod i didnt mark any of the needles, all my gauges read right on except for the spedo. (lift, tires, ect ) gauge reading 70 - gps reads 75. just know your vehicle or use a gps/scangauge to show your true mph.

im about 90% sure the only way to fix the reading would be to somehow re-cal the cpu.
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Old 04-05-2010, 03:29 PM   #6
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Quote:
Originally Posted by MY50cal View Post
^ pretty sure that will not work with newer technology... when i did my dash mod i didnt mark any of the needles, all my gauges read right on except for the spedo. (lift, tires, ect ) gauge reading 70 - gps reads 75. just know your vehicle or use a gps/scangauge to show your true mph.

im about 90% sure the only way to fix the reading would be to somehow re-cal the cpu.
yeah, that's one thing i forgot to mention -- i don't have any experience with the new gauges. i see OP has an 09 as well.
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Old 04-05-2010, 07:08 PM   #7
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Not positive about adjusting the speedo. Best bet would be contact a Speedo shop and see if they can assist. Many have purchased Scan guages. Also, GPS systems will help you with speedo readings as they are pretty accurate.
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Old 04-05-2010, 07:16 PM   #9
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computer time
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Old 04-05-2010, 07:18 PM   #10
Dont be stupid, its not smart.
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when i changed my speedo to blue with the LEDs i changed the speedometer because it was off by 5mph. Now it is correct
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Old 04-05-2010, 07:40 PM   #12
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^they dont want to deal with it haha
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Old 04-05-2010, 07:56 PM   #13
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Speedometer shop in Columbus Ohio
They may be able to regear your speedo
Evans Speedometer Repair

- www.evansauto.com

Sure there are others in the area. Search Google
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Old 04-05-2010, 08:05 PM   #14
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it's not a big deal...i mean how big are your tires?...it's prolly only off like 2 or 3 mph....not gonna get a ticket for that
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Old 04-06-2010, 12:53 AM   #15
I think I'm getting the Fear.
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Quote:
Originally Posted by fighterpilot53 View Post
when i changed my speedo to blue with the LEDs i changed the speedometer because it was off by 5mph. Now it is correct
hmmm, we would like an explanation...









... cause i say bullshit.
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Old 04-06-2010, 02:05 AM   #16
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Keep in mind from the factory it is wrong, usually going slightly larger puts it closer to actual real readings...
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Old 04-06-2010, 02:45 AM   #17
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^^^agreed
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Old 04-06-2010, 03:25 AM   #19
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Funny thing, my truck came with 285/60/18s (31.5") already on it. The speedo reads 70, the GPS says 68-69. Now that I have 275/65/18s (32.1") the speedo & GPS are in sync no matter what constant speed I travel. I wanna trust it but just doesn't seem right for some reason. Are the factory tire sizes 32" OD? Is it really just wrong from the factory as was stated? Why would that be? Same broke ass logic that puts shitty leafs, folding tailgate, squeaky slave cylinders and other such goodies on for years after they are known problems would be my guess.....or they just think they know everyone will be buying larger tires and are just being proactive?
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Old 04-06-2010, 05:51 AM   #20
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Quote:
Originally Posted by chadmb2003 View Post
You could always buy a hypertech calibrator.
x2
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