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We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.

1998.5 UP Speedo calibration and service manual tire size selection confusion?

Posted

 I'm just curious if you guys have any issues with your speedometer  when you compare it to GPS speed.
 I own my truck since 1999 and the speedometer was always off by about 5 miles when traveling at 70 it's actually 75.

I've been looking into the Chrysler shop manual and this stuff doesn't give me the correct tire revolution per mile, WTF?
Chrysler Shop Manual section 22.
TIRES/WHEELS 22.
BR/BE TIRES/WHEELS 22 - 9.
                                                                                                                               
                  SPECIFICATIONS

                  TIRE SIZE SUPPLIER REVOLUTIONS PER MILE

                  P225/75/R16      XL  GOODYEAR     716
                  P245/75R16   WRT/S  GOODYEAR  692
                  P245/75R16  LTX A/S  MICHELIN      691
                  P265/75R16   WRT/S  GOODYEAR  668
                  LT245/75R16 LTX A/S  MICHELIN     679
                  LT245/75R16 LTX M/S  MICHELIN    678 <--- My  DODGE RAM 1999 was set to this ?
                  LT265/75R16 LTX A/S  MICHELIN     648
                  LT265/75R16 LTX M/S  MICHELIN    652 <--- Currently running this tires and I'm still off.
                  LT275/70R17  WGSA  GOODYEAR 650
                  LT235/85R16   WAP  GOODYEAR   650
                  LT235/85R16 LTX M/S  MICHELIN    650 


Now I have a question if you guys have any issues with your speedometer  or did you calibrate your speedometer  with some type of programmer (Smarty, Chrysler DRB III or Hypertech ?).

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  • Chris O.
    Chris O.

    Both of you are on my list. On the side note you would be include even if you said no,  you guys help so many folks around that is not even funny. Just for that you deserve something out of the fo

  • Mopar1973Man
    Mopar1973Man

    Now the other bug you CAN'T resolve is the GPH flow rate given by the ECM for MPG will be majorly off when you add a tuner and injectors. No way to correct that offset. Like my truck its off by 14.5%

  • Chris O.
    Chris O.

    Yeah it's not ready yet but i'm going to need beta testers.  Anyone interested ( Me78569, Mopar1973Man )?   @ Mopar1973Man   I don't think I'm even gonna bother with the fuel rate calcul

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20 hours ago, Mopar1973Man said:

Oh man this is going to be a mess.. It better come with a manual... Wow!

I hope not that should be plug-and-play and easy to follow menu, just like most of the modern OBD scan tools.
Now my neighbors must have thought I was on drugs, when i was testing the HORN RELAY for 2 hours like an IDIOT @ 10pm. :lol3:

    •
    • Like 1

    Man that looks way too cool.  Looking forward to it.  Great work so far.

     

    L8tr

    d

    • 2 weeks later...
    • 1 month later...
    On 12/26/2016 at 1:21 PM, Chris O. said:

    I hope not that should be plug-and-play and easy to follow menu, just like most of the modern OBD scan tools.
    Now my neighbors must have thought I was on drugs, when i was testing the HORN RELAY for 2 hours like an IDIOT @ 10pm. :lol3:

    I totally get what you are saying,  I am like a 2 year old hitting the chime test button and giggling like an idiot. seriously A++ work here man.

    • Author

    lol

    • 2 weeks later...
    • Author

    I would just like to let everyone know currently out of the 3 beta testers ( Mopar1973Man, Me78569, SilverMoose )
    Mopar1973Man and Me78569 currently are playing with the device, busy trying to finish SilverMoose beta gauge.
     

    Message received today from Mike:

    Quote

    Mopar1973Man  
    Holy Cow dude... This little thing is quite amazing. Now I can finally diagnose my ABS issues on my truck and resolve the weird issues with it. I've been able to clear the codes and and start fresh clear slate.

    I'm actually glad it's helping out, hopefully it will help all the 2ND gen truck owners in the near future.

    • Like 1
    • 1 year later...
    • Staff

    Chris,

     

    Where are you at with the CCD tool that you're working on?

     

    I have my old 99 ECM that has the WTS delay and wanted to know if it's fixable or not. 

     

    I bought a 99 Cummins ECM from my friend but it seems as it came from a 5 speed truck, as it has a lopey cam at idle scenario now, and Mike said it's probably due to the anti-stall feature added to the manual trans ECM.

    • 1 month later...
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    Welcome To Mopar1973Man.Com LLC

    We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.