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Old 01-20-2010, 05:47 PM #1
TexasA&M TexasA&M is offline
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Speedometer correction

Getting ready to put a lift and step up to 285s on my '05 4Runner. For you guys have have put bigger tires on, have any of you corrected the speedo? This is my wifes car, so I'd rather have the speedo be correct than just do the math in my head (I already do this on my '86 Chevy).

How do you go about correcting the speedo? Do you have to take it to Toyota?
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Old 01-20-2010, 07:09 PM #2
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Quote:
Originally Posted by TexasA&M View Post
Getting ready to put a lift and step up to 285s on my '05 4Runner. For you guys have have put bigger tires on, have any of you corrected the speedo? This is my wifes car, so I'd rather have the speedo be correct than just do the math in my head (I already do this on my '86 Chevy).

How do you go about correcting the speedo? Do you have to take it to Toyota?
Take it to a reputable shop and ask for the speedo to be recalibrated.
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Old 01-20-2010, 09:16 PM #3
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^^^ Negative. Read this article.

Speedometer correction - Toyota 120 Platforms Forum
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Old 01-20-2010, 11:32 PM #4
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Very interesting. Thanks for the link. Anyone have a write up about pulling the instrument cluster out? I've been wanting to drop in a cluster from a limited anyway (because of the cooler gauges), so this might be a good time to do it.
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Old 01-21-2010, 03:01 AM #5
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Quote:
Originally Posted by TexasA&M View Post
Getting ready to put a lift and step up to 285s on my '05 4Runner. For you guys have have put bigger tires on, have any of you corrected the speedo? This is my wifes car, so I'd rather have the speedo be correct than just do the math in my head (I already do this on my '86 Chevy).

How do you go about correcting the speedo? Do you have to take it to Toyota?
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I've been running 285's for about a year or so now,i use my GPS to verify my actual speed for reassurance.... I noticed the speed indicated on the speedometer is approximately 4-5 mph SLOWER than what is indicated on my GPS unit,due to the taller wider tires.I also agree on the Speedo Healer thread that was linked above.
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Old 02-16-2010, 03:02 AM #6
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So this is weird, I think at one point in her life, someone had bigger tires on my truck but switched to 31x10.5x15's because my speedo is doing the exact opposite of everyone elses. It says that I'm going 4-5mph faster than I actually am. (I pretty much use my gps as a speedo) Anybody have any idea how to re-calibrate the speedo if you don't know the old tire size?
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Old 04-27-2010, 03:49 PM #7
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Getting closer to doing this mod and wondering if anyone out here has instructions on how to pull the main cluster out. I read through the Speedo correction thread link above several times, but I'm still confused on how to get the cluster out. All it says is 'pop out the bezel' and then to remove a couple of screws.

Also, anyone know if an instrument cluster from another vehicle can be plugged in without issue? I want to put a limited cluster in my vehicle because of the cooler gauge needles.
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Old 04-27-2010, 07:36 PM #8
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I wonder if the dealer could perform this through the obd connection. There has to be a tire diameter adjustment in the settings.

IMO the speedohealer that 4Mudder installed is probably a less expensive and better option. You can change tire sizes at will with that box and at no additional cost.
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Old 04-27-2010, 09:53 PM #9
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The correct way to have the speedo work with taller tires is to change the diff gearing. That's what what Toyota does on their 31" tire pkg. That way not only is the speedo accurate, but more importantly the engine operates in it proper bandwidth for optimum power and MPG.
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Old 05-04-2010, 12:09 AM #10
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Quote:
Originally Posted by Mike07SE View Post
Best option in my opinon.

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Originally Posted by fourwd1 View Post
The correct way to have the speedo work with taller tires is to change the diff gearing. That's what what Toyota does on their 31" tire pkg. That way not only is the speedo accurate, but more importantly the engine operates in it proper bandwidth for optimum power and MPG.
That's not entirely true for the 4th Gen. As far as the optimum power and MPG, a regear is probably a good thing. The speedo however is controlled by individual sensors on each wheel IIRC. So regear wouldn't change the speedo at all. Someone correct me if I'm wrong.
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Old 05-04-2010, 04:14 PM #11
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Quote:
Originally Posted by kylebacc View Post
Best option in my opinon.



That's not entirely true for the 4th Gen. As far as the optimum power and MPG, a re-gear is probably a good thing. The speedo however is controlled by individual sensors on each wheel IIRC. So re-gear wouldn't change the speedo at all. Someone correct me if I'm wrong.

Interesting info. No idea if speed is measured at the wheels or at the tranny/tcase. Either way, re-gearing is not an option as it is out of the budget. I don't mind installing a speedohealer type of thing, but I just want to make sure it is the easiest/best way to go about it. I'd also like to find some good instructions for tearing apart the dash so I don't mess anything up while I'm working in there.
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Old 05-12-2010, 07:58 AM #12
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Seth. Ditto. I read 70 on the speedo, and GPS says 62. I think mine came with 31's and now is seriously downsized.
Im a cheapskate, so Im not getting bigger tires till these are shot, and they're mostly new. The speedohealer sounds like an answer.

Why is it, now that I have discovered the speedo miscalculation, cops are tailing me almost daily. Nerve wracking to not know my true speed when I'm being followed. Speedohealer would be cheap piece of mind.
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Old 05-12-2010, 08:52 AM #13
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Maybe one of you would know the answer to this question: http://www.toyota-4runner.org/perfor...tml#post557776, why the FJ with the same 3.73 gears has a 267/70 option while the 4Runner has 3.73 gears and 265/65?
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Old 05-12-2010, 09:01 AM #14
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Quote:
Originally Posted by ChoochCharlie View Post
Speedohealer would be cheap piece of mind.
Not to mention it will keep your odometer, mpg computer, trip meter, and range computer all in line. I really want to do this sometime in the near future.
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Old 05-12-2010, 04:01 PM #15
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Before I went to 265/70/17's from the 265/65/17's my speedo was 1 mph too slow, now it is 1 mph too fast. Not a real concern, but a nuisance. I use the Garmin GPS in my Kenwood 5140DNX and the speedo reading in the Scangauge II to keep me accurate.

It would be cool to simply reprogram it via the OBDII though.
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