Dealer can't correct my odometer error

[John F. Russo]

I checked my odometer accuracy on a toll road with mileage markers over a ten mile stretch. The reading was 8% too high.

When I bought the car from Kenny Brown it had Pirelli 255/45ZR18 and the odometer was very close. Now I have installed two Pirelli 285/45ZR18 tires on the rear.

Initially my dealer asked me for the circumference of the tires on the car. I called Pirelli and they gave me the diameter of the tire (no circumference available). So I used my high school math and calculated the circumference. Then they told me that my tires are not listed so that they can't reprogram my car's computer.

What else do I need to tell my dealer?

[whoskal]

I bet one of our SCT vendors might be able to help you

[High-C]

I believe that you need REVS per MILE... It can then be adjusted through your hand-held tuner...

[BigCars4Ever]

Didn't Kenny have a three program system with a key in the glove box to select programs? You may need to go back to Kenny for help on this.

[VAmarauder03]

i work for ford and was going to try to reprogram for the gears i bought but couldnt, i couldnt find any way to reprogram the computer for gears or tire sizes. the odometer and speedometer readings (atleast on my 2003 300A) are taking through 4 wheel speed sensors and goes through the ABS module as i was told. Our computers have no option for recalibrating that that i could find....try a hand held as others have suggested

[BigCars4Ever]

My SCT 9100 will allow me to reprogram for tire size and gears. The vehicle speed is still through the VSS on the tailshaft.

[Aren Jay]

All your answers are here:

http://www.neuralimpulse.com/maraudertires.html

[John F. Russo]

I met Kenny Brown at his shop after I bought the car. No one told me about this "key in the glove box to select programs".

I tried to call his company a couple of times and found out later that he had serious health problems. He is alive but no one is at his company unless someone else has other info.



Didn't Kenny have a three program system with a key in the glove box to select programs? You may need to go back to Kenny for help on this.

[John F. Russo]

I want to thank all of you for me providing ideas.

I'll send this list to my dealer to see what he thinks.

[Dennis Reinhart]

I checked my odometer accuracy on a toll road with mileage markers over a ten mile stretch. The reading was 8% too high.

When I bought the car from Kenny Brown it had Pirelli 255/45ZR18 and the odometer was very close. Now I have installed two Pirelli 285/45ZR18 tires on the rear.

Initially my dealer asked me for the circumference of the tires on the car. I called Pirelli and they gave me the diameter of the tire (no circumference available). So I used my high school math and calculated the circumference. Then they told me that my tires are not listed so that they can't reprogram my car's computer.

What else do I need to tell my dealer?

It is easily corrected with a Xcal 2

[RF Overlord]

John, I can't find that tire size listed on Pirelli's web site...

[MM_BKK]

i work for ford and was going to try to reprogram for the gears i bought but couldnt, i couldnt find any way to reprogram the computer for gears or tire sizes. the odometer and speedometer readings (atleast on my 2003 300A) are taking through 4 wheel speed sensors and goes through the ABS module as i was told. Our computers have no option for recalibrating that that i could find....try a hand held as others have suggested

The vehicle speed reading is from VSS on the tailshaft of the transmission as BigCars4Ever have said.
The speedometer accuracy can be adjusted with a tune.


I believe that you need REVS per MILE... It can then be adjusted through your hand-held tuner...

Bingo! I was able to calibrate my speedometer reading against my GPS by changing the Tire Revs per Mile setting in my tuner. I can adjust for any oddball gear ratio or tire diameter. When I tried to change the gears or tire diameter setting, it wouldn't take.

You'll need to figure out the % difference of gear or tire diameter then add/subtract to the factory Revs per Mile.
Of course, you will need a tuner that will allow you to change Tire Revs per Mile.

[HwyCruiser]

Are the KB Marauders chipped? If so I don't think a hand-held would do him any good unless he wanted to go with a full custom re-tune or if he can find someone to read the chip and then re-flash it with only the corrected revs-per-mile changed. The easy solution is to put the correct size tires back on the car?

[Aren Jay]

See the link I posted above, it gives you all the needed rev numbers.

[VAmarauder03]

The vehicle speed reading is from VSS on the tailshaft of the transmission as BigCars4Ever have said.
The speedometer accuracy can be adjusted with a tune.


never said it couldnt be adjusted with a tune, and then do you mind explaining to me why i have no sensor in my tailshaft?

[fastblackmerc]

never said it couldnt be adjusted with a tune, and then do you mind explaining to me why i have no sensor in my tailshaft?

It's not on the tailshaft. It's called the Output Shaft Speed Sensor (OSS). According to the manual it looks like it's mounted on the left side of the trans case.

[MM_BKK]

i work for ford and was going to try to reprogram for the gears i bought but couldnt, i couldnt find any way to reprogram the computer for gears or tire sizes. the odometer and speedometer readings (atleast on my 2003 300A) are taking through 4 wheel speed sensors and goes through the ABS module as i was told. Our computers have no option for recalibrating that that i could find....try a hand held as others have suggested
You said you couldn't find a way to reprogram the computer. Any type of tune will reprogram the computer.


never said it couldnt be adjusted with a tune, and then do you mind explaining to me why i have no sensor in my tailshaft?
By tailshaft, I meant the output shaft of the transmission and not the driveshaft. Have you taken out the extension housing of the transmission? You're not going to find any wires or cables through the extension housing like the older transmission.
All the wiring are through the main harness.
If in fact the car gets the speed reading from the ABS sensors and not the trans then if you changed rear gears, the speedometer then should NOT be affected.

BTW, did you put in the new gears yourself yet?

[John F. Russo]

John, I can't find that tire size listed on Pirelli's web site...

You are right. It is still being offered. It depends upon the remaining stock or who knows what.

What would you suggest as a rep;acement since I think it won't last. They use to offer the 305 version at one time. Now it is definitely out of stock I think and won't be brought back to the market.

[John F. Russo]

It is easily corrected with a Xcal 2

Good to hear from you again, Dennis.

Do you sell it? What's the cost?

[John F. Russo]

Are the KB Marauders chipped? If so I don't think a hand-held would do him any good unless he wanted to go with a full custom re-tune or if he can find someone to read the chip and then re-flash it with only the corrected revs-per-mile changed. The easy solution is to put the correct size tires back on the car?


KB did the entire package including the tune. So I'm stuck?

I won't go back to my old tires. I like the added grip too much.

[John F. Russo]

never said it couldnt be adjusted with a tune, and then do you mind explaining to me why i have no sensor in my tailshaft?

This is getting beyond me.

Let's recap. What does this all mean about whether a hand held will do it or not? Do I have to get the original program to do anything?

[HwyCruiser]

I think your going to have to find a tuner (as in a person) to help solve this issue. The actual change in the tune - revs per mile - is simple enough, but getting the change into your car's PCM is the real trick. If your car is chipped then it might be a matter of pulling the chip and sending it to someone that can read it and then reprogram it with the change for you. I guess I'd be going out on a limb by assuming your car has an SCT chip with a KB spec'ed tune in it, although it could be an early Diablo chip. Mac could probably could tell you if he was still around. A dealer isn't going to be able to do anything for you other than to reflash your PCM to a stock code, which you definitely don't want to do because you'll loose the recalibrations for the supercharger and whatever else KB had changed as far as the tune goes.

[John F. Russo]

I think your going to have to find a tuner (as in a person) to help solve this issue. The actual change in the tune - revs per mile - is simple enough, but getting the change into your car's PCM is the real trick. If your car is chipped then it might be a matter of pulling the chip and sending it to someone that can read it and then reprogram it with the change for you. I guess I'd be going out on a limb by assuming your car has an SCT chip with a KB spec'ed tune in it, although it could be an early Diablo chip. Mac could probably could tell you if he was still around. A dealer isn't going to be able to do anything for you other than to reflash your PCM to a stock code, which you definitely don't want to do because you'll loose the recalibrations for the supercharger and whatever else KB had changed as far as the tune goes.

Thank you very much. I'll call Mac and check with him.

[RF Overlord]

John, try Haggis and/or Ladyhawke. The both have KB cars...(#5 and #8 I believe)

As far as getting the speedo corrected, check all the popular tire manufacturer web sites and see if anyone else sells a 285/45-18 and if so, they should have the revs per mile listed. That's really the only thing in your tune that needs to be changed.

[Ladyhawke]

a three program system with a key in the glove box to select programs

Our cars do not have this. Maybe Kenny changed the setup later on

John, email sent. Good luck with this issue!

[BigCars4Ever]

I'm not full of *****. See here http://www.mercurymarauder.net/forums/showthread.php?t=565
At one time tjis was in his literature. I thought it was standard but mabey it was an option.