|
|
|
|
||
|
||
| From | Message |
| Dave Unregistered  1/04/2001 12:05:57 |
 Subject: SpeedometerIP: Logged Message: Is there any way to update the computer when changing tire size so the speedometer displays the correct speed? I know it's not a big deal, but would still like to know that when the speedo says 65 mph, that's the speed I'm doing. |
| Bernd GenIII  1/04/2001 12:08:15 | RE: Speedometer IP: Logged Message: You dealer can custom program the PCM to the gear and tire size you have...at a $65 minimum charge though...and only if it's required. 1998+ Dakota's don't use a speedo-gear anymore. It's electronically controlled. Or...if it's '97 or older, you can match the speedo-gear with something close to it from the parts counter at your local dealer. Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Dave Unregistered 1/04/2001 12:14:38 | RE: Speedometer IP: Logged Message: Thanks Bernd, I had a feeling that the dealer could do that. I just talked with one and he said they couldn't. I have a 98 so I need the PCM reprogramed. You mentioned that this can be done only if it's required, please explain. |
| Bernd GenIII 1/04/2001 12:21:48 | RE: Speedometer IP: Logged Message: It sounds like they don't want to do it for some reason (they can do this). However, the computer does compensate for changes since it uses the driveshaft rotation and wheel rotation in a mathematical formula for speed. Example: On a co-workers '98 Automatic (Dakota 5.2L Sport) we had changed the actual differential gears to 4.10:1 (from 3.55:1) and the speedometer was still accurate. If you have a speedo-shop somewhere in your area, see if you can have them check your speedo for accuracy. What tire size did you have originally and what did you change them to? Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Dave Unregistered 1/04/2001 12:26:14 | RE: Speedometer IP: Logged Message: Once again, Thanks. It's not much of a tire change but I went from P23575R15 to 31X10.50R15. The actual tire diameters are 28.9 inches and 30.2 inches respectively. It works out to a 4.5% difference. It sounds like I may not need to worry about it. |
| Bernd GenIII 1/04/2001 12:27:35 | RE: Speedometer IP: Logged Message: If you have a buddy to follow alongside you on a highway, see how close your speedo is to his/hers. It's probably going to be very close if not still accurate. Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Dave Unregistered 1/04/2001 12:30:41 | RE: Speedometer IP: Logged Message: I have to take it in for service tomorrow anyway. I may just ask them to do it. Thanks & I love my Dak. |
| Dave Dakota Enthusiast 1/05/2001 09:06:54 | RE: Speedometer IP: Logged Message: Bernd, I took my Dak into the shop today for some work and asked the service manager (the same one I talked to yesterday and told me it could not be done) and asked him to recalibrate the PCM for the new tires. He didn't blink at the request and said no problem. Thanks for the help. Dave Fisher 1998 Dodge Dakota Club Cab Sport 4X4 3.9L V6 |
| Bernd GenIII 1/05/2001 10:15:37 | RE: Speedometer IP: Logged Message: Glad to help. Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Jade Dodge Dakota  11/15/2001 16:10:29 |  speedometerIP: Logged Message: I own a 98 Dakota, the speedometer has stopped working, I have tried a new speed sensor, and a new head unit, neither have seemed to work, any ideas? |
| HSKR Dodge Dakota 11/15/2001 21:09:12 | RE: Speedometer IP: Logged Message: Bernd, I went to my dealer and asked them to change mine. The only way they can adjust it is if the tire size you switched to is the same as one offered from the factory. If's it's not a factory setting, the dealer can't change it. At least that's what I was told. |
| CW GenIII   11/15/2001 21:26:45 | RE: Speedometer IP: Logged Message: Yes that is correct, factory tire sizes only. Every thing in between the lagest and the smallest factory tire size can be adjusted for. 2001 4.7 5sp RC 3.91 sport plus |
| joe Dodge Dakota 11/17/2001 07:10:44 | RE: Speedometer IP: Logged Message: Dave, I made the exact same tire size switch on my 97 dak and the service advisor and mechanic said no speedometer change was needed. |
| TEAMFAST Dodge Dakota 11/17/2001 21:04:27 | RE: Speedometer IP: Logged Message: Hey, look at it this way. if you leave the speedo the way it is, you will have 4.5% less mileage clocked if your calculations are correct |
| Mark Schuyler Dodge Dakota JOIN HERE 8/21/2011 01:10:11 | RE: Speedometer IP: Logged Message: Here is a convenient link for calculating tire size changes...precise math for you. http://www.facebook.com/l/IAQBYjz1AAQDUN4jZI2QYGN81weGj9S6Tqf8WUwaQVH1FfQ/www.miata.net/garage/tirecalc.html |
| mark Sliman GenI  8/21/2011 19:02:01 | RE: Speedometer IP: Logged Message: this website will tell you the speedo difference. Jus tput in your original tire size and the new size. you can imput any give speed and it will tell you the new speed. http://www.discounttiredirect.com/direct/brochure/info/tmpInfoTireMath.jsp |
| Todd93/96Dak Dodge Dakota JOIN HERE 8/22/2011 09:31:39 | RE: Speedometer IP: Logged Message: Do you two above me realize that your commenting to a 10yr old post? |
| P 1 | |
Post a reply to this message: Username Registration: Optional All visitors are allowed to post messages |
|
Home | Photos | Message Board | Links | Classified | Mailing List | Contests | Feedback |
 |
Property of Virtual-Masters, Inc. |
 |