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Speedometer correction #386512 Jan 28, 3:41pm Jan 28, 3:41pm
Joined: Nov 2002
Posts: 489
Hampton, VA
CRBN BLU OP
Senior Member
2002 Toyota Celica GT
CRBN BLU OP
Senior Member
2002 Toyota Celica GT

Joined: Nov 2002
Posts: 489
Hampton, VA
Speedometer correction
Ok, so I was cruising by one of those mobile radar stations that tell you how fast you are going. I had cruise set at 55, but the machine said I was doing 48. I do have 17 inch rims with low profile tires, but I matched them up so the overall diameter of them is very nearly equal to the stock wheels and tires. Also, I did disassemble my gauge cluster to do the LED conversion, if that might disrupt the calibration of the speedometer.

My question is this: Is there a way to make my speedometer read correctly again? I went to a calibration shop today, and it turns out the mobile radar station was right. It's about 6 mph off where it should be. The guy said since the car is so new (2002), there is no way they can correct the cluster to read correctly. He said there isn't anything on the market that can help me. His final analysis is that I have to just mentally know that my speedometer reads 5mph faster than what I am really traveling.


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Re: Speedometer correction [Re: CRBN BLU] #386513 Jan 28, 3:50pm Jan 28, 3:50pm
Joined: Jun 2004
Posts: 3,748
Gainesville, FL
hombredelassrtas
CF Connoisseur
2004 Toyota Celica
hombredelassrtas
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2004 Toyota Celica

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Gainesville, FL
take off your needle. tunr ur car to acc i belive leave for leik 20 sec it will calibrate then put needle back on. now if its becasue of your tires i dont know

Re: Speedometer correction [Re: CRBN BLU] #386514 Jan 28, 3:52pm Jan 28, 3:52pm
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Cen+Cal "L-TOWN" (Lemoore)
tai_mai_shu
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2002 Toyota Celica GT
tai_mai_shu
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2002 Toyota Celica GT

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Cen+Cal "L-TOWN" (Lemoore)
A lot of my friends say that they give all cars a 5mph more then what the car is saying, thats why when you are cruisin 70 on a 65 and a cop clocks you in you wont get pulled over only if the cop isnt a dick, correct me if im wrong! But yea ive notcie the same thing a while ago since i got new gauges and 17" rims.


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Re: Speedometer correction [Re: tai_mai_shu] #386515 Jan 28, 3:55pm Jan 28, 3:55pm
Joined: May 2004
Posts: 528
Tempe, AZ
renfield90
Senior Member
2001 Toyota Celica GT
renfield90
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2001 Toyota Celica GT

Joined: May 2004
Posts: 528
Tempe, AZ
Yeah, I read somewhere that the DOT almost requires police to give a 5 MPH leeway, and usually when you read the guidelines for speeding fines, they start at 5 MPH over.

They can pull you over still, since you ARE above the speed limit, but they'd probably just give you a warning.

Re: Speedometer correction [Re: renfield90] #386516 Jan 28, 8:25pm Jan 28, 8:25pm
Joined: Dec 2004
Posts: 401
Arkansas
maingear
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2002 Toyota Celica
maingear
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Arkansas
I had a friend at a P.D. clock me at 130, my car read 125. 100 was 113 on radar. The gun is less than a year old! I wonder what 55 realy is?

Re: Speedometer correction [Re: maingear] #386517 Jan 28, 8:40pm Jan 28, 8:40pm
Joined: Jul 2004
Posts: 89
Madison WI
L3M1315
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2000 Toyota Celica
L3M1315
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Yeah, radar guns need to be calibrated often, and with the right tuning fork. I think if I ever get pulled, I'm gonna ask when the last time the gun was calibrated. I figure that's my only fighting chance.

My stock '00 has always been 5mph fast, even after the RJAutoworks upgrade.

Re: Speedometer correction [Re: L3M1315] #386518 Jan 28, 9:23pm Jan 28, 9:23pm
Joined: Oct 2003
Posts: 2,030
Orange County, Ca
RevMonster
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2003 Toyota Celica
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Orange County, Ca
Radar is only accurate under the most perfect of circumstances. Radar measures the speed at which the object is traveling to or from the gun... which means to get a perfect reading, you'd have to be directly behind of in front of the object. If the gun is even slightly off from the plane on which the object is moving, the reading won't be fully accurate.


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Re: Speedometer correction [Re: RevMonster] #386519 Jan 28, 9:24pm Jan 28, 9:24pm
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Orange County, Ca
RevMonster
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Oh yes, also...

Most factory speedo's are set a hair on the safe side, maybe 2-3% below the actual speed. spineyes


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Re: Speedometer correction [Re: CRBN BLU] #386520 Jan 29, 8:36am Jan 29, 8:36am
Joined: Mar 2004
Posts: 132
New York
SunburstCelica
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2001 Toyota Celica GT
SunburstCelica
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New York
I have the same problem with my 01' celica GT. It started after I put an overlay on instrument panel & had to remove needles. It's never been the same since. I've tried the acc method 20x but it still reads 7mph over the actual. When stopping you can see the speedo go to 5mph pauses then after you've stopped it drops to zero. Does anyone else notice this? I've had a friend set his cruise & travel along side me & it's definatley off. We have school radar that posts your speed as you travel by(over by 7mph). I also have low profile tires & kept the same overall diameter as stock so this is not the cause. Only other option which I've heard discussed here is to get a GPS unit & while driving with cruise set have someone put needles on to the speed on the GPS(dangerous). I think most people who have taken off there gauges have this problem but really haven't noticed like a few of us have. Don't worry, you're not the only one that this bothers.

Re: Speedometer correction [Re: RevMonster] #386521 Jan 29, 9:17am Jan 29, 9:17am
Joined: Jan 2005
Posts: 27
nc
2000 silver Toyota Celica
racuda
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2000 Toyota Celica
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nc
Originally Posted by RevMonster
Radar is only accurate under the most perfect of circumstances. Radar measures the speed at which the object is traveling to or from the gun... which means to get a perfect reading, you'd have to be directly behind of in front of the object. If the gun is even slightly off from the plane on which the object is moving, the reading won't be fully accurate.


True, but if the radar gun is at an angle to you the error will be in your favor - it will read slower than you are actually going.

Re: Speedometer correction [Re: racuda] #386522 Jan 29, 11:23am Jan 29, 11:23am
Joined: Jun 2004
Posts: 1,337
Pittsburgh, PA
celicadragon
Specialist
2002 Toyota Celica
celicadragon
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Posts: 1,337
Pittsburgh, PA
i was just wondering this same thing it feels like i am going slower than i really am but i have never messed with my gauges all i have is 17' rims, why would these change anything just becasue of rims


respect the gt-s
Re: Speedometer correction [Re: SunburstCelica] #386523 Jan 29, 3:49pm Jan 29, 3:49pm
Joined: Nov 2002
Posts: 489
Hampton, VA
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Posts: 489
Hampton, VA
Originally Posted by SunburstCelica
When stopping you can see the speedo go to 5mph pauses then after you've stopped it drops to zero. Does anyone else notice this?


I have this exact same problem!! So I know I'm not the only one.

Originally Posted by SunburstCelica
Only other option which I've heard discussed here is to get a GPS unit & while driving with cruise set have someone put needles on to the speed on the GPS(dangerous). I think most people who have taken off there gauges have this problem but really haven't noticed like a few of us have. Don't worry, you're not the only one that this bothers.


That's not a bad idea. But I don't want to be the first to try it. It's risky, but a feasible idea.


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