Speedometer not precise

Resurrected · 05-27-2009, 04:36 PM

Like the title says;

Last night i was driving down a street that had one of those speed detectors, (the kind that remind you if your going over the limit by blinking.)

my car speedometer said i was going 40mph, but the radar said i was going 33mph.There where no cars around me, so i KNOW it was detecting me and me only.

is there a way to calibrate the odometer?

PearlJammzz · 05-27-2009, 05:12 PM

what size wheel/tire do you have? Changing the size of the wheel/tire changes what your speedo reads vs how fast you are really going.

Resurrected · 05-27-2009, 05:37 PM

my tires and wheels are stock. and so is the suspension.

TomsMR2 · 05-27-2009, 06:06 PM

if your tires, wheels, and suspension are stock.. whos lowered with rims picture did you steal for your avatar?

old 80's speedometers are notoriously inaccurate.. try to borrow someones gps and see how far you're off at 60.. it'll be more and less accurate at varying speeds.

Resurrected · 05-27-2009, 06:39 PM

lol my signature is just a random image of what my car looks like in my dreams.
but my car is an mk2

Ben · 05-27-2009, 07:08 PM

You can't calibrate the speedo since it is mechanical and driven be a cable. Have someone drive next to you and see what they have in comparison to you

RoboZIG · 05-28-2009, 05:28 PM

Ive got a 91 NA and I noticed the same thing. I noticed the same way you did then had someone drive behind me and tell me how fast I was going. Its pretty consistantly 5mph slower than what my speedometer says Im going.

David · 05-29-2009, 11:21 PM

Damn, I need to drive by one of those. I think mine might be off.

xer0 · 05-29-2009, 11:44 PM

look at it this way
since your going "slower", and you get popped for 70 in a 65,.. A-HA
lol, orr it will count less mileage

RoboZIG · 05-30-2009, 10:18 AM

if you're going slower than what it says wont it count more mileage?

05-27-2009, 04:36 PM	#1 (permalink)
Resurrected I Drift Mine's Join Date: Apr 2009 Location: Idaho Posts: 240 Thanks: 1 Thanked 4 Times in 4 Posts iTrader Rating: (1/100% )	Speedometer not precise Like the title says; Last night i was driving down a street that had one of those speed detectors, (the kind that remind you if your going over the limit by blinking.) my car speedometer said i was going 40mph, but the radar said i was going 33mph.There where no cars around me, so i KNOW it was detecting me and me only. is there a way to calibrate the odometer?

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05-27-2009, 05:12 PM	#2 (permalink)
PearlJammzz Cage Fighter Join Date: Feb 2006 Posts: 2,140 Thanks: 9 Thanked 70 Times in 66 Posts My Google Map iTrader Rating: (7/100% )	what size wheel/tire do you have? Changing the size of the wheel/tire changes what your speedo reads vs how fast you are really going.

05-27-2009, 05:37 PM	#3 (permalink)
Resurrected I Drift Mine's Join Date: Apr 2009 Location: Idaho Posts: 240 Thanks: 1 Thanked 4 Times in 4 Posts iTrader Rating: (1/100% )	my tires and wheels are stock. and so is the suspension.

05-27-2009, 06:06 PM	#4 (permalink)
TomsMR2 Formerly Tom Brokaw Join Date: Feb 2005 Location: Bay Area Posts: 2,497 Thanks: 8 Thanked 233 Times in 168 Posts Blog Entries: 1 iTrader Rating: (0/0% )	if your tires, wheels, and suspension are stock.. whos lowered with rims picture did you steal for your avatar? old 80's speedometers are notoriously inaccurate.. try to borrow someones gps and see how far you're off at 60.. it'll be more and less accurate at varying speeds.

05-27-2009, 06:39 PM	#5 (permalink)
Resurrected I Drift Mine's Join Date: Apr 2009 Location: Idaho Posts: 240 Thanks: 1 Thanked 4 Times in 4 Posts iTrader Rating: (1/100% )	lol my signature is just a random image of what my car looks like in my dreams. but my car is an mk2

05-27-2009, 07:08 PM	#6 (permalink)
Ben Same In The End Join Date: Aug 2006 Location: Oceanside, CA / Reno, NV Posts: 3,928 Thanks: 18 Thanked 276 Times in 258 Posts My Google Map iTrader Rating: (11/100% )	You can't calibrate the speedo since it is mechanical and driven be a cable. Have someone drive next to you and see what they have in comparison to you

05-28-2009, 05:28 PM	#7 (permalink)
RoboZIG No Skills Join Date: Apr 2009 Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Ive got a 91 NA and I noticed the same thing. I noticed the same way you did then had someone drive behind me and tell me how fast I was going. Its pretty consistantly 5mph slower than what my speedometer says Im going.

05-29-2009, 11:21 PM	#8 (permalink)
David Take a picture trick! Join Date: Jun 2007 Location: Tampa, Fl. Posts: 1,300 Thanks: 111 Thanked 25 Times in 25 Posts My Google Map iTrader Rating: (4/100% )	Damn, I need to drive by one of those. I think mine might be off.

05-29-2009, 11:44 PM	#9 (permalink)
xer0 No Skills Join Date: Feb 2005 Location: Socal (SFV) Posts: 6 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	look at it this way since your going "slower", and you get popped for 70 in a 65,.. A-HA lol, orr it will count less mileage

05-30-2009, 10:18 AM	#10 (permalink)
RoboZIG No Skills Join Date: Apr 2009 Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	if you're going slower than what it says wont it count more mileage?