Had the 60k trans service done and the shifting was a bit jerky at first, now a bit back to normal. Is there a ‘relearn’ time or stored up trash that need to settle? Is there a throttle position reset on the Jags?

Any experience you can share?

regards, Donm

 

My 2013 is a bit harsh sometimes as well. Would like to know if there is adaptation procedure

 

Both ZF models used on XJ:s, 6- and 8-speed, have continous adaption function, so it will sort out itself for oil viscosition in its limits. If i remember right, there are also forced adaption on SDD (factory diag system) what includes learning drive for various speeds. However: just normal driving will do the trick in time. Allways use the correct oil, since autoboxes have wet clutchpads and incorrect oil can cause harm for them or incorrect "crip-level" what can cause jerky shifting. Also wrong oils can cause rubber parts to turn britlle. Been changing tranny oils every 90k km (56k Miles) and mine are still silk smooth. I have soon 260k km (+160k Miles) on the clock.
No idea for throttle position reset... Sorry. (service manual on sticky section?)
AlexJag: You have lot of power. If you use that power capasity a lot, i would change box (and engine) oils often. High forces mean high pressure/heat between components and only thing between these components are thin film of oil.

 

Vasara your informed input is much appreciated

 

Thanks for the input! Well on this car it was doing the same thing when it had the stock tune and 470 horsepower and does exactly the same when it's 620hp right now . I know on my old 2008 Xkr with 6spd was doing that as well but after i did adaptation procedure it completely went away but I can't find any procedures on the 8spd transmission.

 

Ok. Any info about history of oil changes/ oil type used? The 8-speed ZF are the best automatic tranny money can buy at the moment and car manufacturers pretty much fight to get it in their top models since its launch. Very reliable and economic unit. (set many dual clutch systems in a shame) I wish mine would have it too, but on 2010 there was only 6-speed. (not too bad either with torqy diesel)
Every automatic tranny need 3 things to work correctly:
- Oil type to work with material of frictionpad clutches used. Wrong type, and frictionpads can slip or stick too much. -> You will feel thump.
- Oil pressure to operate hydraulic levers (controlled by solenoids). Not enough pressure, by leaky O-rings, sleeves, blocked filter, too low or too high oil level can cause problems. Low pressure means low force or late operation of levers/clutches. -> You will feel thump. (not sure about 8-speed, but on 6-speed the sleeves of mechtronic are known to crack/harden in time)
- Sharp solenoids. Solenoids are valves to control oil pressure circuits to move gears and clutches in the box. As you would imagine that when shifting gears there are many things to happen inside of tranny in exact time to get different speed rotating gears match together smootly. If solenoid are sticking and the valve opens exsample 0.3sek late, the speed of spinning gears are not sync in the moment of connection -> You will feel thump. Solenoids can just go bad or the tiny particles weared off from friction pads can accumulate and cause jams.

On vehicles what have seen every part of automobiles life with half million miles, all above can be issue. Also one above can cause others to appear. Try low oil: Frictionpads start to wear -> Filter and solenoids full of particles.
Just throwing thoughs up in the air.

 

Reporting as OP, the shifting is smoothing out with more driving time. Thanks for the info!

 

The gearbox is constantly adapting to how you drive, the issue of funky shifts is nothing to worry about at all! The transmission ecu is constantly adjusting and learning.

Ben.

 

Yes technically you should have used SDD to reset the adaptions during the transmission service procedure. But if you don't the transmission will eventually learn the new settings on it's own. Clearing the adaptions just starts things over right now so the adaptations won't take as long to complete.
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End of story - First shop botched the trans service somehow, even with two opportunities. Second shop did a repeat and all is well.

now I’ll report on overheating in other thread.

 

So what did the first shop do wrong thay the second shop corrected?