| From | Message |
kaderdak
GenIII
 
11/10/2005
23:30:09
|
 Subject: speedometer calibration
IP: Logged
Message:
I know this question has been asked 1000 times before, but how do you go about doing this (or can it even be done yourself). I put on the next size bigger tires, 32's, and now of course my speedometer reads slow. How do I go about getting it fixed, do I need to take it to a mechanic. '97 5.2 4x4
** '97 Dakota 5.2L 4x4 w/3.55(my best ebay purchase yet) **
** Homebrew CIA, Dynomax Catback, March Underdrive Pulleys, Transgo Kit **
** Borg Warner Brass Cap/Rotor to Taylor 8mm wires to NGK plugs **
** Homebrew dual electric fan setup with 180* thermostat **
** Sitting on BFG 31 x 10.50's **
** Tons more once I'm not a poor college student :) **
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cuzindoug
GenIII
11/10/2005
23:49:12
| RE: speedometer calibration
IP: Logged
Message:
The only remedy that I know of is to of course take it to a stealership, or buy a superchip tuner or something like it. It has a tire size adjustment to it.
If it ain't broke, fix it til it is.
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ken
GenIII
11/11/2005
11:48:14
| RE: speedometer calibration
IP: Logged
Message:
if you really want to do it cheap, there is a way but its definitely not the best way. you could just remove the glass over your guages, take off the speedo needle and put it back on about 3-5 mph ahead. this wouldn't be accurate but it would be more accurate than it is now between 30-70mph. its better for it to read a little fast than a little slow because cops don't care what your speedo said, they just care what their radar said
can't lose on 22s
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intensedak39
*GenIII*
11/11/2005
11:57:44
| RE: speedometer calibration
IP: Logged
Message:
here's an alternative;
www.krcperformance.com
http://krcperformance.net/cart/prodetails.asp?prodid=8&start=
there are other brands out there but i cannot think of their names.
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intensedak39
*GenIII*
11/11/2005
12:02:54
| RE: speedometer calibration
IP: Logged
Message:
http://store.summitracing.com/partdetail.asp?autofilter=1&part=JET%2D50110&N=4294925143+4294839059+4294845270&autoview=sku
http://store.summitracing.com/partdetail.asp?autofilter=1&part=SLF%2D33002&N=4294925143+4294839059+4294845270&autoview=sku
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JimmyD
Dodge Dakota
JOIN HERE
11/11/2005
15:24:58
| RE: speedometer calibration
IP: Logged
Message:
Not too much difference there.
According to my calculations, if 31x10.5 was your stock tire size:
When your speedo says 29, you're doing 30.
When your speedo says 58, you're doing 60.
When your speedo says 87, you're doing 90.
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kaderdak
GenIII
11/11/2005
17:12:00
| RE: speedometer calibration
IP: Logged
Message:
Well, I don't actually think that a 31" tire was stock on the truck. I believe that the stock size is closer to a 30" tire (255/75/16) or something along those lines. My speedometer has been off just a little bit when I put the 31" tires on, now with the 32" tires it's a little too inaccurate for my taste.
The last time I drove by one of those roadside radars it said I was doing 45, when my speedometer said 40.
So I figure I've got trouble waiting to happen unless I get it fixed here pretty quick.
** '97 Dakota 5.2L 4x4 w/3.55(my best ebay purchase yet) **
** Homebrew CIA, Dynomax Catback, March Underdrive Pulleys, Transgo Kit **
** Borg Warner Brass Cap/Rotor to Taylor 8mm wires to NGK plugs **
** Homebrew dual electric fan setup with 180* thermostat **
** Sitting on BFG 31 x 10.50's **
** Tons more once I'm not a poor college student :) **
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intensedak39
*GenIII*
11/11/2005
17:38:38
| RE: speedometer calibration
IP: Logged
Message:
your truck is a 97 so it's stock wheel size is 15". There for your stock tire couldnt be a 16" version.
stock tires on 97 4x4's were either 235/75/15 or 31/10.50/15
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Leviticus
Dodge Dakota
JOIN HERE
11/13/2005
19:28:12
| RE: speedometer calibration
IP: Logged
Message:
Superlift makes a Tru-speed speedometer calibrator for the Dakota/Durango that connects in your engine bay with two wires that resets your speedo. Its about $150-180.
|
Adam
Dodge Dakota
JOIN HERE
11/13/2005
20:02:07
| RE: speedometer calibration
IP: Logged
Message:
31" Tires were an optional size for our trucks. Going to 32's only puts you off about 1-2mph. I've done this already so I know from experience. Jimmy's calculations are right on.
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kaderdak
GenIII
11/14/2005
21:35:44
| RE: speedometer calibration
IP: Logged
Message:
Intense - I believe that a 235/75/15 is closer to a 29" tall tire. If that is truly what the stock size is then of course I'm way off. If it's supposed to be a 31" then maybe not. Regardless, I know my speedometer is quite a ways off.
** '97 Dakota 5.2L 4x4 w/3.55(my best ebay purchase yet) **
** Homebrew CIA, Dynomax Catback, March Underdrive Pulleys, Transgo Kit **
** Borg Warner Brass Cap/Rotor to Taylor 8mm wires to NGK plugs **
** Homebrew dual electric fan setup with 180* thermostat **
** Sitting on BFG 31 x 10.50's **
** Tons more once I'm not a poor college student :) **
|
intensedak39
*GenIII*
11/14/2005
22:12:10
| RE: speedometer calibration
IP: Logged
Message:
yeah a 235/75 is 29". I went from that size to a 32/11.50/15 on my durango and it was pretty far off... but now i'm back down to the stock size.
|
GB2000
GenIII
11/15/2005
01:17:36
| RE: speedometer calibration
IP: Logged
Message:
Mine's off a bit...you get used to it after a while. Eventually I'll be able to afford a Superchips tuner and have it fixed, but for now...I just remember that when I'm doing 100, I'm really going around 105. ha
Josh Blackshire - Founder, OhioDakotas.NET
Red 98 Dakota Sport - Check it out!
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Jetsfan8099
Dodge Dakota
JOIN HERE
11/15/2005
08:26:47
| RE: speedometer calibration
IP: Logged
Message:
My assumption is that when you adjust your speedometer, your tachometer therefore would be adjusted too. Which means your truck will have more miles on it when you go to sell it than if you didn't try to correct the few miles an hour faster that you are going. Sounds like an easy way to lose money, Correct?
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intensedak39
*GenIII*
11/15/2005
14:42:59
| RE: speedometer calibration
IP: Logged
Message:
your tachometer doesnt adjust...
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GB2000
GenIII
11/15/2005
18:17:17
| RE: speedometer calibration
IP: Logged
Message:
In a sense...your vehicle will have more miles on it when you go to sell it, however it will be accurate mileage rather than off a lil bit. It's also nice for keeping your general maintenance stuff accurate...because if you like to do your oil changes right on 3000 miles, you're going over everytime if you go by 3000 miles on your odometer.
Josh Blackshire - Founder, OhioDakotas.NET
Red 98 Dakota Sport - Check it out!
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intensedak39
*GenIII*
11/15/2005
18:20:04
| RE: speedometer calibration
IP: Logged
Message:
... and your warranty will last longer
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Super bee
GenI
11/16/2005
10:23:47
| RE: speedometer calibration
IP: Logged
Message:
i need to figure out my speedo/odometer on my 1990/1995
it read 7mph fast, which with going from 3.55 to 3.92 and 28" tire to 30" tire should not make a difference
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Fed
GenII
11/16/2005
12:20:07
|  RE: speedometer calibration
IP: Logged
Message:
The faster you go the worse it gets
because i just put in 4.10s in my truck and my speedo is off by 5
mph now... but if im doin round 75 im really going 85, says my
GPS
?
'93 Dakota CC 3.9 auto
(4.10, LSD, magnaflow exhaust, K&N intake, lowered)
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Super bee
GenI
11/17/2005
01:32:01
| RE: speedometer calibration
IP: Logged
Message:
im trying to figure out if there is a way to fix
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Super bee
GenI
11/19/2005
19:09:24
| RE: speedometer calibration
IP: Logged
Message:
other than spending $150
and i dont even know if they make them for a 95
a genI is awesome with a 318 ;-)
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