[tennis_pr0]

I have a 2007 335i auto, and when driving uphill it usually shifts into second or third at 2k rpm, but when flat it shifts round 1.5k rpm, is this normal?

[tennis_pr0]

anyone?

[deadmn1337]

Yes it should be normal as you need a little more power to go uphill.

[tennis_pr0]

Thanks man appreciate the feedback

[1QuikWS6]

As stated before - Yes

tranny shifting takes into account many parameters, including load on engine - which will be higher going up hill, and tend to elongate shift points.

Mine even takes a little longer yet to shift up hill if engine/tranny is really cold 1st thing in morning.

I've also found that shift charactersitics change if your air filter is very dirty and not flowing well...


Of course you can always overide and force it to shift up if you have paddle shifters

[Three_thirty_I]

Under normal conditions changing up at these low revs is fine, but for a cold engine in my view this is labouring the engine. Now of course I don't have an automatic, so I dictate the gear changes, and in general I don't let the revs climb higher than 2500 when the engine is cold, but if going up a hill then I rather let it climb to 2500 rpm. The idea being that the revs are then not too low when you have changed to the higher gear. When the engine is cold you are also using a smaller throttle opening so you want to allow the engine to run more into the torque curve.

A few years back I had a 320d automatic for a day or so while my car was in for a service, and the one thing that I was immediately aware of was that in normal D mode the gearbox would change up very quickly and "force" the engine to run at very low revs. Being a diesel this is fine, but when cold it was changing up at 1500 rpm and trying to maintaining an engine speed of roughly 1200 rpm, my mechanically sympathy for a cold engine had me put the gearbox in DS mode which then allowed the engine speeds to stay just a bit higher and closer to 2000 rpm. So less strain on the cold engine and gearbox...