Speedometer is inaccurate, how to adjust? - DODGE DAKOTA FORUM - FORUM AND OWNERS CLUB!
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  #1  
Old 06-13-2018, 02:12 PM
KingSlinks KingSlinks is offline
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Question Speedometer is inaccurate, how to adjust?

The original tire size for my truck is 195/75/R15. those dont exist anymore so I put on 215/75/R15.

according to this ( https://tiresize.com/speedometer-calibration/ ) at 60mph on my gauge I should actually be travelling at 63.

but the speed Im actually going is 69mph if my gauge is at 60. I have tested this multiple times with friends in other cars telling me my speed. at 30mph Ill be going like 34mph.

my questions are;

how do I fix this/is it worth fixing?

is this also effecting my odometer?
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Old 06-13-2018, 02:32 PM
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The thread at the link discusses this subject in detail. Different situation but principles are the same.

http://www.dakotaforumz.com/showthread.php?t=10359
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Old 06-13-2018, 05:14 PM
KingSlinks KingSlinks is offline
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Quote:
Originally Posted by oldmarine View Post
The thread at the link discusses this subject in detail. Different situation but principles are the same.

http://www.dakotaforumz.com/showthread.php?t=10359
thanks for the reply!

I read through the whole thread and I'm afraid I have no idea what they're talking about. I just bought this truck and don't really know anything about it

are those gears in the speedometer or gears in the transmission? I'm not even sure where the speedometer is.
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Old 06-13-2018, 08:32 PM
RalphP RalphP is offline
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Quote:
Originally Posted by KingSlinks View Post
thanks for the reply!

I read through the whole thread and I'm afraid I have no idea what they're talking about. I just bought this truck and don't really know anything about it

are those gears in the speedometer or gears in the transmission? I'm not even sure where the speedometer is.
*blink*

Big round thing right in the middle of the dash for the Gen1 Dakotas, is labeled in MPH or KPH, indicates the speed of the vehicle, hence the "speed-o-meter".

The gears in the discussion, however, are in the transmission; it's a drive gear that drives the cable (or VSS) to spin it to drive the speedometer; when it's not appropriate, it will cause the indicated speed to be off.

RwP
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Old 06-14-2018, 12:22 AM
KingSlinks KingSlinks is offline
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Quote:
Originally Posted by RalphP View Post

*blink*

Big round thing right in the middle of the dash for the Gen1 Dakotas, is labeled in MPH or KPH, indicates the speed of the vehicle, hence the "speed-o-meter".

The gears in the discussion, however, are in the transmission; it's a drive gear that drives the cable (or VSS) to spin it to drive the speedometer; when it's not appropriate, it will cause the indicated speed to be off.


RwP

Haha I should have explained that I know where the speedometer is I just didn't know where or how it gets the information about the speed I'm going.

So are you saying that a previous owner had to have swapped out gears in the transmission for my gauge to be off as much as it is?
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Old 06-14-2018, 12:22 PM
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Could also be they changed the size of the tires, or changed the transmission, or the rear end.

ALL of that is possible on a vehicle this old.

A 1995 uses the VSS to drive the ECU and the speedometer both (Dodge went that way in 1994); but 1987-1993 Dodge used a cable from the transmission to the speedometer for the speedometer drive.

It may also be an inaccurate speedometer at the current age; they can start to fail with age, after all.

Due to the local pricing, I'd swap the speedometer in the cluster with a boneyard part for a while first (see if it's more accurate); then I'd get the speedometer drive gear in the transmission swapped if that doesn't change anything.

RwP
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Old 06-16-2018, 02:22 AM
pjbonfire pjbonfire is offline
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Default Easy to tell accuracy

I have a programmer and can adjust the speedometer, but I still had to determine the speedometer was correct. I downloaded a program called Polaris on my cellphone that does all kinds of wonderful things, including exact speed using GPS. You may not be able to adjust your speedometer but you will know what speed you are going.

If your speedometer says 60 MPH and Polaris says 70 MPH, you know the speedometer is off by 10 MPH and can adjust your driving speed.
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Old 06-16-2018, 04:59 AM
felzke440 felzke440 is offline
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2nd question 1st,does affect odometer correspondingly so you will go farther than it reads. A little late since you've already acquired tires but 205/70/15 would have been pretty close to what you had. 215/70/15 wouldn't be very far off. For pinpoint accuracy get yourself a Garmin GPS. Can be had for about $125 or good used ones around $40 -$80 on e-bay. They're accurate, can check mpg by resetting it and has map you can program.
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