Baffled, rear tire wear and Steptronic. - Bimmerfest - BMW Forums



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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 03-08-2017, 02:52 PM
528iAut 528iAut is offline
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Baffled, rear tire wear and Steptronic.

Did not have anything to do, so what is better than some Googling on e39?
Came across this british site where they have advice on classic cars, http://classics.honestjohn.co.uk/rev...section=buying , and here I see this:
"Excess rear tyre wear can cause Steptronic autoboxes to stick in a lower gear after ascending an incline."
Never heard about this, how can a gearbox know what the thread wear is, does not make sense.
It is just interesting to me because my car is reluctant to change up to 2nd gear after a little climp up a hill, however, switching to Steptronic it changes right away, so again, this statement makes no sense to me.
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Old 03-09-2017, 08:36 AM
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QSilver7 QSilver7 is offline
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I'm not sure how to interpret what you read on the internet...but the transmission's operating parameters sound normal if the gear select lever is in "D". There are nine (9) AGS/EGS adaptive modes based on either individual driver input or road/environmental conditions. Plus the manually selected S (extreme sport) mode and manual modes (requires STEPTRONIC or the A/M or SEM switch next to the gear shift lever).

When you move the gear lever out of "D"...this also ends or deselects any of the "adaptive" programming. So if the tranny is still in the UPHILL RECOGNITION mode...and you move the gear select lever into the STEPTRONIC "S or M" gate...it will cease the adaptive programming.

Due to the "adaptive" programming (fuzzy logic) BMW uses...there are 3 adaptive modes that are automatically selected each time the vehicle is started based on the behavior of the driver's response to the accelerator pedal:
  • Extreme Economy (granny-toe mode)
  • Economy
  • Sport

Then there are also 6 adaptive modes/programs that are automatically selected by road and/or environmental conditons:
  • STOP-n-GO mode
  • Winter Drive program
  • Uphill recognition program
  • Downhill recognition program
  • Curve recognition
  • Cruise Control Drive program














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Old 03-09-2017, 01:32 PM
528iAut 528iAut is offline
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Amazing info, thank you.
I think I am a "Granny Mode" user, mostly.
Anyway, I am used to the gearbox reluctance now so it is okay, but I find it a bit strange anyway. Where I live there I go up a hill that is a little steep, normally pretty slowly, the box goes into 1st gear about halfway up, and it is fine. I then turn left and the road is flat again and the gearbox does not change up as it normally does, the rpm goes up to maybe 2-2500, if I then lift my foot a little it normally shifts, or if I shift the lever to M/S mode and back to D it also shifts immediately.
But yes, I recognize some of the patterns you mention, like the downhill pattern. This irritated me in the beginning because the engine seemed to always "work" going downhill, I was used to an E46 manual where if you go downhill and remove you foot from the accelerator the cars fuel economy meter would go to zero, this does not happen too often with the e39 and the Steptronic box.
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Old 03-09-2017, 02:11 PM
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Glad you did recognize some of the adaptive modes kicking in. The owners manual doesn't go into deep detail about it which can make many owners wonder what is going on. But anytime the shifting pattern seems to be still in one of the adaptive programs...just kick the gear shift lever over into the S mode to cancel what ever it was doing....if it's not returning to normal ECONOMY mode on its own (which is usually the default mode)
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2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 2013 F06 650ix Gran Coupe` (Black Sapphire) 1/13 mfg date
(SOLD)
97 740iL (Arctic Silver) <<~>> 99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

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Old 03-09-2017, 02:37 PM
528iAut 528iAut is offline
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Yes, it is no problem really.
Feels like the car has gotten used to me now. Maybe it was not driven much before, when I got it the shift from 1st to 2nd was very abrubt, I wrote about that before, but now it seems a lot smoother, not always but it is an improvement. All other shifts are very smooth.
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Old 03-10-2017, 09:23 AM
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The uphill thing where the car wont shift until 2-2500rpm, my car does that to. You need to drive a bit long, like a couple hundred meters for it to shift back to normal mode. On the downhill mode the fuel is shutoff any time the wheels drive the engine just unlock the cluster and watch the instant fuel display, it goes to 0 L/h.
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