Gear changing

[Merlin5]

Hi guys.  I've got a brand new silver Seat Leon courtesy car while mine is being repaired. It's got a cool.electronic handbrake,  a square flat button, which threw me. I was like "where's the handbrake?"

Should get mine back tomorrow or next week.

Something odd I've gotten used to on the Auris, but.don't like,  is that when lifting from the accelerator during changing gear, the revs don't reduce quickly,  it sounds like I haven't come off the gas,  almost over revving, and it makes gear changes feel lumpy. So I do slower gear changes to compensate,  allowing more time for the revs to reduce and that way I get smooth gear charges.  There's no clutch slipping or anything like that. 

It made me think I wasn't lifting enough, but I've been driving for over 40 years so I should know by now how to change gears.  Never had that problem with my previous peugeot. This Seat Leon is also very easy to change gears, the revs instantly reduce on lifting and I can charge gear as fast as I like and it's smooth. So I know it's not me.

Does this sound familiar to any of you?

[FROSTYBALLS]

My 2006 Corolla did this, and when I got my Auris' (2009 and 2012) I was used to it. Something to do with the emissions control.

[Merlin5]

35 minutes ago, FROSTYBALLS said:

My 2006 Corolla did this, and when I got my Auris' (2009 and 2012) I was used to it. Something to do with the emissions control.

i had a Blue Corolla, I think it was a 2005 plate.  But don't remember how the gear changes felt. 

Emissions control, interesting.  No idea how that affects the revs. Well good to know it's a Toyota thing as opposed to faulty, although it would be nice if it was something that could be adjusted.

[furtula]

Auris does not rev that much. As others said, it's due to emissions control.

My 1.6 mazda 3 also used to rev when changing, at higher rpm's it used to rev up to 300 rpm more, and it was such a pleasure to the ears to listen to, during gear changes.

[Gerg]

17 hours ago, Merlin5 said:

Emissions control, interesting.  No idea how that affects the revs.

I have an idea that as the engine revs drop to a lower level (as per after a gear change), a momentarily rich petrol/air mixture is created until the revs stabilize again.  I would not have expected this to cause that much of an emissions-type problem as it is so  brief, but evidently it does.  The engine management computer attempts to mitigate against this by holding the throttle open slightly, initially, to dilute this richness.

New, tighter, emissions regulations from 2006-on meant that petrol cars had to migrate to an electronic (fly-by-wire) throttle, which is probably an integral part of reducing this effect, and giving much greater control to the ECU to prevent engine operation that might cause emissions 'glitches' or spikes.

Even back in the '80s or before, some cars had a damper fitted to their carburettor throttle plates, so that snapping closed the throttle suddenly was not realistically possible. In those pre-catalyst (in Europe, not the US) times this was still causing an emissions problem, and was even then, sometimes, preventing an 'intuitive' throttle response . At least on Japanese cars it was.  I don't remember other cars having this stuff fitted very much.

That's my take on it anyway.