| LOST JEEPS http://www.lostjeeps.com/forum/phpBB3/ |
|
| Computer update when adding 4.10 gears? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=60651 |
Page 1 of 1 |
| Author: | tulsa [ Thu May 12, 2011 3:48 pm ] |
| Post subject: | Computer update when adding 4.10 gears? |
Have any CRD drivers who changed to 4.10 gears had the computer changed to reflect the ratio change? |
|
| Author: | tjkj2002 [ Thu May 12, 2011 7:39 pm ] |
| Post subject: | Re: Computer update when adding 4.10 gears? |
Gear ratio does not matter for the speedo on a KJ,only tire diameter effects it. |
|
| Author: | Sir Sam [ Thu May 12, 2011 9:10 pm ] |
| Post subject: | Re: Computer update when adding 4.10 gears? |
tulsa wrote: Have any CRD drivers who changed to 4.10 gears had the computer changed to reflect the ratio change? A DRBIII(2005) or a Starscan(2006) will be needed to program new revs/mile, the BCM and the ABS will both need to be programmed with the new revs/mile. |
|
| Author: | JL Rockies [ Thu May 12, 2011 10:52 pm ] |
| Post subject: | Computer update when adding 4.10 gears? |
I've done nothing beyond the installation and I've had no problems. |
|
| Author: | cmohr [ Fri May 13, 2011 12:45 am ] |
| Post subject: | Re: Computer update when adding 4.10 gears? |
The crown gear can only rotate 1:1 with the wheel itself, as the rear speed sensor is reading flags on the crown 1 rotation is still 1 rotation regardless of how many teeth the gear has, so as far as the car knows basically there is no difference. Only a change in wheel Diameter effects the ECU. You can get a "Pinion Reset" done at some stealerships, they change the figure for revs - per - mile, in early models and in later models they choose a tyre size. |
|
| Author: | mrb91 [ Mon May 16, 2011 3:10 pm ] |
| Post subject: | Re: Computer update when adding 4.10 gears? |
If gear changes don't change the speedometer then where does the speedometer get its information for how fast you are going, since most speedometers have their sending unit in the transmission? So if I change my 3.73 to 4.10 while running my 32's I won't need to recalculate my speedometer? |
|
| Author: | irollgen4s [ Mon May 16, 2011 4:14 pm ] |
| Post subject: | Re: Computer update when adding 4.10 gears? |
They get it from a wheel sensor on the rear axle i believe. basically you tell the computer you are running bigger tires and it changes its reading as so. |
|
| Author: | warp2diesel [ Mon May 16, 2011 4:18 pm ] |
| Post subject: | Re: Computer update when adding 4.10 gears? |
On the '06, the four ABS wheel sensors send the signal to the BCM. The '05 uses the front ABS wheel sensors and a sensor in the rear differential. Most of the older rear wheel drive rigs with mechanical speedometers/odometers measured the speed and distance by the rear drive shaft, that is why you had to have a new box or have the little plastic gear in the back of the trans swapped out. With the electronic speedometer/odometer that measures the turns of the wheels, changing your axle ratio makes no difference. Put on bigger tires, then you need the BCM reset for your new size tires. For me, the 215 85 R16 tires corrected my speedometer error and I multiply by 1.115 to correct the odometer reading when I do my mileage calculation or file my expense account for miles traveled. |
|
| Author: | DOC4444 [ Mon May 16, 2011 11:35 pm ] |
| Post subject: | Re: Computer update when adding 4.10 gears? |
An '05 gets the odometer signal from the rear speed sensor. When it is disconnected, the speedometer still works as well as the cruise control, but no odometer. I don't know whether the speedo gets its signal from a front wheel speed sensor or off the transmission. DOC |
|
| Page 1 of 1 | All times are UTC - 5 hours [ DST ] |
| Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group http://www.phpbb.com/ |
|