Alfa OBD Success! - Page 44 - Dodge Cummins Diesel Forum
2013-2018 General Discussion General Chit Chat About the 2013 model year differences 6.7L 4th generation Cummins - NO ADVERTISING - Sponsored by: StarLite Diesel

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post #517 of 616 (permalink) Old 09-30-2019, 10:11 PM
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Quote:
Originally Posted by Brummo View Post
Not to go off track, but for those of us with 2018 trucks. From what I am reading, to get Alfa OBD to work we need to by another connector?

I'd like to be able to adjust some things, but am unsure as to what I need to get to do it.

Thanks


You'll need the bypass cable that @ M2Mods / @deereguy sells


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post #518 of 616 (permalink) Old 09-30-2019, 10:55 PM
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Originally Posted by cutoutcummins View Post
I'd go with the smallest size first. My 35's measured like 34.5 but to get my speedo right was closer to 33" if I remember.

I used this to get the tire size in millimeters

https://tiresize.com/calculator/


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ya my 285/75-18s are listed as 35.1" tall, but on the truck they are listed as above. I have read to use the actual measured height, just wondering which one.

Quote:
Originally Posted by Brummo View Post
Not to go off track, but for those of us with 2018 trucks. From what I am reading, to get Alfa OBD to work we need to by another connector?
I'd like to be able to adjust some things, but am unsure as to what I need to get to do it.
Thanks
yes, you need the security bypass module.

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post #519 of 616 (permalink) Old 09-30-2019, 11:03 PM
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Quote:
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ya my 285/75-18s are listed as 35.1" tall, but on the truck they are listed as above. I have read to use the actual measured height, just wondering which one.







yes, you need the security bypass module.


Like I said start with the smallest size first. It's probably going to take a few tries to get it right. Took me 4 or 5 times to get it and I'm still off by ~1 mph. I am waiting for winter when I put my winter tires on which are 275/65/20 to see where I'm at


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post #520 of 616 (permalink) Old 09-30-2019, 11:33 PM
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ya my 285/75-18s are listed as 35.1" tall, but on the truck they are listed as above. I have read to use the actual measured height, just wondering which one.

.
I'm running 285/75-18s and I just took a real world measurement of what they were on the truck (34 ish if I remember) and it worked perfectly.
I inputted that actual measured height and I am spot on with my displayed mph vs gps mph.


.

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post #521 of 616 (permalink) Old 10-01-2019, 02:20 AM
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You can go to the tire manufacturer web site and get the actual rolling diameter in revolutions per mile. 20168/revs per mile will get you a very close starting number. It will be slightly low do to rounding error on the 20168.

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post #522 of 616 (permalink) Old 10-01-2019, 10:47 AM
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Originally Posted by mtnrider View Post
I'm running 285/75-18s and I just took a real world measurement of what they were on the truck (34 ish if I remember) and it worked perfectly.
I inputted that actual measured height and I am spot on with my displayed mph vs gps mph.


.

i understand. i want to use the real world measurement on the the truck. however, my measurements are 33.75 rear and 33.5 front. these are 285/75-18s.

i understand to pick one try it and try again if it is not right. however, i am not keen on trying multiple times. that just creates multiple times for errors

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post #523 of 616 (permalink) Old 10-01-2019, 01:00 PM
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That 1/4" difference between the front and rear isn't going to make a difference on your speedo. There will only be about 4 more tire rotations every mile on the front tires compared to the rear tires. I say use either measurement, your speedo is going to read the same.

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post #524 of 616 (permalink) Old 10-01-2019, 05:45 PM
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Just an FYI for those who haven't tried yet, I attempted to hook my laptop up to the truck using the cable that normally connects to my CTS2. DO NOT DO THIS. I emailed the person at Alfaobd asking if I could do this. The response was he wasn't sure, it would either connect or it wouldn't. I contacted Edge. They weren't sure either and said the same thing. So, I tried. Luckily, I didn't do any permanent damage. It melted part of the HDMI connection. Was connected for maybe 20-30 seconds, things didn't seem right, so I disconnected rather abruptly, thank goodness. Slightly damaged the HDMI cable, but it's still usable. The dongle I used to connect to the laptop took the brunt of the damage. Laptop seems fine. Truck threw a canbus code. Cleared it and it hasn't come back. That was six days ago. Needless to say, I think (and hope) I got lucky. Just figured I would put this out as a warning to others.


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post #525 of 616 (permalink) Old 10-01-2019, 07:44 PM
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ok, pulled the trigger and got it done. was a little nerveracked at first.
went with the measured height of 33.75" on the truck, 285/75-18. converted to a circumference of 2693.
speedo was very close, I would say anywhere from 1/2-1mph fast.

i went home and corrected to 2691. speedo was still fast, but gps seemed to respond faster more inline with the speedo.

i corrected to 2689 for the last time. the speedo and gps were pretty darn accurate and close to each other. the speedo still would read a touch faster for a moment, then the gps would respond.

i think i am done adjusting for now.

i may reduce another 2mm and see if that makes it dead accurate.

thanks for all the info

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post #526 of 616 (permalink) Old 10-01-2019, 08:39 PM
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Great. I did the same as you with 33.8. Adjusted it with 2689 and came out perfect and i have 295-70-18 Cooper's.

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post #527 of 616 (permalink) Old 10-03-2019, 05:49 PM
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Has anybody installed the cargo camera on a 2013 2500 successfully even tho it did not come with the soft switches from factory?

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post #528 of 616 (permalink) Old 10-15-2019, 09:11 PM
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Anyone have a link to Bypass Module needed for the 18's?
The site that was suggested before says out of stock...

2018 2500 CC Laramie 6.7L Cummins
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