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Wheel diameter n ODO speedo calibration? #419414 Mar 17, 2:58pm Mar 17, 2:58pm
Joined: Dec 2003
Posts: 487
Portland, Oregon
GTS2003BLK OP
Senior Member
2003 Toyota Celica
GTS2003BLK OP
Senior Member
2003 Toyota Celica

Joined: Dec 2003
Posts: 487
Portland, Oregon
Wheel diameter n ODO speedo calibration?
So from the dealership you can get a Celica with 15, 16, and in the case of some of the special editions 18 inch wheels;

I know this must have an effect on odometer and speedometer calibration. What kind of adjustments do they make at the dealership to compensate for this?

Re: Wheel diameter n ODO speedo calibration? [Re: GTS2003BLK] #419415 Mar 17, 3:35pm Mar 17, 3:35pm
Joined: Nov 2002
Posts: 489
Hampton, VA
CRBN BLU
Senior Member
2002 Toyota Celica GT
CRBN BLU
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2002 Toyota Celica GT

Joined: Nov 2002
Posts: 489
Hampton, VA
I'm very interested in the responses you get for this. My speedometer is all f-ed up. I have 17's, which started the problem. Now, the speedometer reads 12% too fast. If it says I'm doing 70, I'm really only going 62. I even paid to have it calibrated, but the dude said there was no way to correct it to read right since the car is so new. I'm with you though, Toyota has to know how to correct it, but I don't want to pay a dealer to do it.


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Re: Wheel diameter n ODO speedo calibration? [Re: CRBN BLU] #419416 Mar 18, 10:04pm Mar 18, 10:04pm
Joined: Jul 2004
Posts: 777
Tempe, AZ
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ExNihilo
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2004 Toyota Celica GTS
ExNihilo
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Posts: 777
Tempe, AZ
Short of getting a custom speedometer, I haven't heard of any way to fix it.


300,000 KM/Sec. Its not just a good idea, its the law.
Re: Wheel diameter n ODO speedo calibration? [Re: ExNihilo] #419417 Mar 19, 1:05am Mar 19, 1:05am
Joined: May 2004
Posts: 409
Charleston, SC
2002 Silver Toyota Celica
sweetnuts4sale
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2002 Toyota Celica
sweetnuts4sale
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2002 Toyota Celica

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Charleston, SC
there was a link in ecelica about this it was a calculator that converted from the rim and tire size from before an after swapping shoes.

i know someone in here has the link... ... just wait...

Re: Wheel diameter n ODO speedo calibration? [Re: sweetnuts4sale] #419418 Mar 19, 1:08am Mar 19, 1:08am
Joined: May 2004
Posts: 409
Charleston, SC
2002 Silver Toyota Celica
sweetnuts4sale
Senior Member
2002 Toyota Celica
sweetnuts4sale
2002 Silver Toyota Celica
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2002 Toyota Celica

Joined: May 2004
Posts: 409
Charleston, SC
oh yeah you can alway "ghetto" fix it by riding beside your boy while his driving beside you telling when he gets to a certain speed talking on the cell and you can recalibrating your speedometer like that


^^^ sorry about the run oon sentence. i'm drunk

Re: Wheel diameter n ODO speedo calibration? [Re: sweetnuts4sale] #419419 Mar 19, 2:29am Mar 19, 2:29am
Joined: Dec 2003
Posts: 487
Portland, Oregon
GTS2003BLK OP
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2003 Toyota Celica
GTS2003BLK OP
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2003 Toyota Celica

Joined: Dec 2003
Posts: 487
Portland, Oregon
Yeah I've seen the calculators:

http://www.paspeedo.com/calculator.htm

https://www.celicahobby.com/tech/speedcalc.html

But there must be a way that Toyota re-calibrates the computer on the special editions that have 18 inch wheels.

Another one of their guarded trade secrets I guess.

http://www.toyota.com/motorsports/spotlight/widebody.html

Re: Wheel diameter n ODO speedo calibration? [Re: GTS2003BLK] #419420 Mar 19, 4:06am Mar 19, 4:06am
Joined: Jun 2004
Posts: 264
Boston
GT4
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1993 Toyota Celica Alltrac
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1993 Toyota Celica Alltrac

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Posts: 264
Boston
It's not only the wheel diameter that hurts the speedometer, but the "overall wheel+tire" diameter that hurts it. If you keep the overall diameter close to the stock size, there will be ver little effect on speedometer. For example stock GTS 205/50/16 has a diameter of 24.07 inches. With 215/40/17, new diameter will be 23.77 inches. Speedo error is only 0.75 mph when you are driving at 60 mph.


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Re: Wheel diameter n ODO speedo calibration? [Re: GT4] #419421 Mar 19, 8:52am Mar 19, 8:52am
Joined: Jun 2003
Posts: 2,863
St. George, UT
v3n0m
Specialist
2001 Toyota Celica GT
v3n0m
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2001 Toyota Celica GT

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St. George, UT
TIRES.COM

They tell you what tire to run to keep the odometer close to OEM...you can order tires them...and they're pretty cheap, too.

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