torque management

[voudoux]

I have a1999 xj 4.0 automatic, does this model use torque management to "soften" wot shifts? I have read that it does not have torque management that the engine just runs out of power before it shifts(I find this hard to believe). I also got a lesson on cable adjustment. The chip companies claim their chips will remove torque management, all I want to know is was it used on this xj and how to remove it.

 

[BlueCuda]

I am real sure it doesn't, maybe you have a problem? My 97 has solid firm shifts with 230k on the clock

 

[voudoux]

I bought this xj new, it went back to the dealer the next day for the soft /mushy drawn out 1/2 shift, their reply was they were not allowed to "touch" these transmissions only replace them if they stoped working. It was returned numerous times for this problem ,with no results. It has been shifting this way for 85000 miles no better no worse,so I figured it was designed in. A fter learning of torque management in other vehicles including Jeep I thought I had found the answer,maybe not . thanks

 

[BlueCuda]

Sorry, I really don't think it has any kind of torque managment. Mine screams up to the shift but its not been a stock 4.0 in 8 years, best I remember my friends cherokees don't fall off at all. Is it shifting soft or is the motor laying down before the shift?

Off subject but I drove a good friend of mines 08 Denalli Truck yesterday. Its got the 405HP 6.2 IIRC and its owned by torque managment. It totally lays down for the shifts and has its nuts cut off if you hit from a dead stop.

 

[voudoux]

It is shifting soft and slow and the engine power seems to back off all at the same time, the power loss does not feel like you ran out of power from escesive rpms nor is it like a lean hover,and I don't think it is getting into the rev limiter either. the shift feels like it is just below the point of sliping,but it never does. thanks

 

[Talyn]

I don't know about the earlier years, but 97+ uses torque management. You may not notice it, but its there. However, it is an non performance based automatic and even with TQ management off it will still shift some what soft. Also to disable it isn't as easy as cutting a wire, as on the WJ. You need the PCM reprogrammed to remove it. I think OP has some other problem.

BTW, torque management is when you cut of power very briefly while the transmission is shifting. It has nothing to do with the red line or limiting power near red line.

 

[Super mud]

It totally lays down for the shifts and has its nuts cut off if you hit from a dead stop.

Best description of the feel of newer vehicles

 

[Talyn]

I don't know what newer vehicles you drive, but I haven't driven one that does that.

 

[Dr. Dyno]

However, it is an non performance based automatic and even with TQ management off it will still shift some what soft. Also to disable it isn't as easy as cutting a wire, as on the WJ. You need the PCM reprogrammed to remove it.

Yeah, from what I've heard the torque management "vasectomy" isn't possible in an XJ.

 

[Talyn]

It is possible. I have had mine done, but the company that did it no longer does it. You can feel the shifts much more, especially the down shifts and they are significantly firmer. Surprisingly it is through the PCM not the TCM.

 

[BlueCuda]

I don't know about the earlier years, but 97+ uses torque management. You may not notice it, but its there. However, it is an non performance based automatic and even with TQ management off it will still shift some what soft. Also to disable it isn't as easy as cutting a wire, as on the WJ. You need the PCM reprogrammed to remove it. I think OP has some other problem.

BTW, torque management is when you cut of power very briefly while the transmission is shifting. It has nothing to do with the red line or limiting power near red line.

I have to disagree, torque management is when the computer pulls timing or throttle to save driveline parts. It makes a big difference to remove on the GM F-bodys with automatics. The above mentioned Denalli truck I mentioned does it very badly from a dead stop. I have an 02 F250 with the gas 5.4 and it doesn't let you have anything from a dead stop, you can hammer the gas and it takes off like you rolled into the throttle.

You know more about the XJ computer than me but I don't see where mine ever cuts engine power to shift? It shifts firm and quick depsite the extra power and wieght.

 

[Talyn]

I am not concerned how GM uses torque management. This isn't a GM forum. The Jeep XJ PCM uses torque management to

The XJ uses torque management, but not a whole lot. You don't notice it because you haven't driven it with out it. The shifts are firmer and the transmission feels more solid over all. I didn't believe the XJ had it until I got my PCM reprogramed.

 

[voudoux]

Thanks for all the info,I have been told that the settings in the pcm are not changeable in the later model xj.Don't know if this is true or not.I agre this is a xj forum. Thanks again

 

[Talyn]

It can be disabled, but the company that did mine is no longer in business. IIRC B&G performance and Kenne Bell use to modify these PCMs as well. Might want to check with them

 

[xj upnovr]

Level Ten Transmission in Vernon NJ can do it.

levelten.com