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post #1 of 8 Old 02-05-2015, 07:51 PM Thread Starter
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Help me figure this out.

Here's the deal my jeep has done this since the day we bought it at auction. The speedo is off with stock gears an tires. It came from Canada and seems to of been converted to US standard in the dash panel. I have bought a procal to set it for the new tires and gear ratio but it did not fix the original problem. All wheel speed sensors are working properly. Up to 35 mph it is dead on per the GPS speedo I test with and my Garmin. At 40 it is actually 45. At 50 it is actually 58 at 60 it is at 70 at 65 im at almost 80.

Plus now my ABS is way over active. I have replaced the clock spring twice. The dealerships looks at me like i have a dick growing out of my forehead because i modified my jeep with a MOTECH conversion. I have worked thru this with them but cannot get a dealer to understand that it is still the same original problem i came from Canada with stock.
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post #2 of 8 Old 02-05-2015, 08:04 PM
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What "MoTech" conversion?

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post #3 of 8 Old 02-05-2015, 08:21 PM Thread Starter
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5.3l and 6l80e. The dealers around Robbie have seen enough of them they understand what he is telling them. Around me here in Michigan there are very few of us in the SW corner of the state. All the dealerships with the testing tools for this issue blame it on something to do with the lift or the engine conversion. There is something in the CANBUS or Chrysler programming, kph/mph conversion I assume they did properly.
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post #4 of 8 Old 02-05-2015, 09:15 PM
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Quote:
Originally Posted by 68w30 View Post
Here's the deal my jeep has done this since the day we bought it at auction. The speedo is off with stock gears an tires. It came from Canada and seems to of been converted to US standard in the dash panel. I have bought a procal to set it for the new tires and gear ratio but it did not fix the original problem. All wheel speed sensors are working properly. Up to 35 mph it is dead on per the GPS speedo I test with and my Garmin. At 40 it is actually 45. At 50 it is actually 58 at 60 it is at 70 at 65 im at almost 80.

Plus now my ABS is way over active. I have replaced the clock spring twice. The dealerships looks at me like i have a dick growing out of my forehead because i modified my jeep with a MOTECH conversion. I have worked thru this with them but cannot get a dealer to understand that it is still the same original problem i came from Canada with stock.
OK, so if I'm picking up what you're laying down . . .
At 45 MPH, it's indicating 89% of GPS speed.
At 58 MPH, it's indicating 86% of GPS speed.
At 70 MPH, it's indicating 86% of GPS speed.
At 80 MPH, it's indicating 81% of GPS speed.
Well, you could try to figure out what factory defect or KPH-MPH conversion error or other root cause is throwing it off . . .
OR
. . . you could use a programmer to lie to your Jeep about your gears and/or tire size by about 85% and call it good

That bitch is lying to you, so return the favor instead of trying to figure out what's pissing her off.

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post #5 of 8 Old 02-06-2015, 10:25 AM
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If you go back to the original instrument panel, what happens? Is the Km/h speedo off also?

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post #6 of 8 Old 02-06-2015, 07:36 PM Thread Starter
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I don't know it was done before i got it. I've tried calling the chrysler tech hotline but can never get thru to talk to a person to have them run the vin to find out where the conversion was done. I'm beginning to think that it may not of been done right and they only changed out the cluster.

I did try a AEV Procal. It did not fix the problem. I had to lie to it to get it as close as it is now for around town driving.
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post #7 of 8 Old 02-07-2015, 07:11 AM
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How do you know what gears you have? It sounds like you are setting the programmer to the incorrect gearing. I would try 3.21, 3.73, 4.10, etc till it was close.

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post #8 of 8 Old 02-08-2015, 08:12 PM Thread Starter
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I changed the gear ratio to 4.56 and added lockers.
I have tried several combos with the procal but that has shown not to be the fix.
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