|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Throttle lag--its an automatic tranmission thing!
|
|
10-12-2016, 07:50 AM | #1 |
Major
497
Rep 1,208
Posts
Drives: 2009 BMW 328i Wagon
Join Date: Apr 2009
Location: Asheville, NC
|
Throttle lag--its an automatic tranmission thing!
I currently have a 6mt wagon and a 6at wagon since I haven't sold the automatic one yet. Nearly identical cars, both LCI.
The 6mt one has no throttle lag, while the 6at one does. Ha! I think this proves that its not DBW, rather it's some silly programming in the automatic transmission. Last edited by rothwem; 10-13-2016 at 08:16 AM.. |
10-12-2016, 09:42 AM | #4 | |
Major General
3987
Rep 7,212
Posts |
Quote:
I think he would regret it, because he got an MT to replace the slow/laggy AT.. Yes, of course it's not the DBW. The response time of a DBW system is way faster than humans can perceive. also, the off the shelf AA tune doesn't change any throttle settings, so if anyone tells me a tune fixed the throttle lag Imma smack them. |
|
Appreciate
0
|
10-12-2016, 10:20 AM | #5 |
Lieutenant
82
Rep 525
Posts |
|
Appreciate
0
|
10-12-2016, 11:36 AM | #7 |
Cometh
1247
Rep 1,411
Posts
Drives: Boy's Soul
Join Date: Jul 2016
Location: Boy's Hole
|
I've noticed that my automatic is laggy in "D" mode as it likes to start in 2nd gear and hold higher gears for fuel economy and less noise. "DS" mode is much better.
I've driven manuals my whole life and I'm content with this automatic. I use "D" for cruising and "DS" for spirited or city driving. "M" is a decent compromise for manual shifting but nothing can replace the enjoyment of a proper manual. |
Appreciate
0
|
10-12-2016, 12:10 PM | #8 | |
Lieutenant
59
Rep 552
Posts |
Quote:
Similarly, most AT folks bitching at the tranny don't drive it in DS manual mode. The auto box is not bad, and works very well when driven in manual mode. I put around 40k miles on my DS manual and find it a joy. Just like I enjoy my other stick honda and sport bike. No lag, pure fun, different experience |
|
Appreciate
0
|
10-12-2016, 12:42 PM | #10 |
Lieutenant
59
Rep 552
Posts |
No need to play with the clutch obviously. Theres a reason many autos come with steering paddles. I like to stay in the desired gear and thanks to 21st century, manual trannies are not the only option to upshift, downshift and rev the shit out of her for accoustic pleasure
|
Appreciate
0
|
10-12-2016, 03:36 PM | #11 |
Major
497
Rep 1,208
Posts
Drives: 2009 BMW 328i Wagon
Join Date: Apr 2009
Location: Asheville, NC
|
Its been a while since I've used DS mode...I feel silly driving through my neighborhood with the engine screaming. I'll try it on the way home today, I drove the automatic to work since it was looking neglected in the driveway this morning.
|
Appreciate
0
|
10-12-2016, 04:15 PM | #12 |
Major General
2313
Rep 5,228
Posts |
DS is noteworthy and useful when in oddly hilly areas like San Francisco and when you're canyon carving or when you want better response.
For some reason I find it makes the motor louder for some odd reason given same rpm and perceived load. Almost like a whine noise. Is this bc the valvetronic is holding the valves farther open, hassmachine? All that being said...I still would rather have the manual :-) |
Appreciate
0
|
10-12-2016, 05:44 PM | #15 |
Major General
3987
Rep 7,212
Posts |
the transmission has no control over valvetronic lift. it's possible you aren't reaching full load though in which case it wouldn't use the WOT lift curve.
|
Appreciate
0
|
10-12-2016, 06:30 PM | #16 | |
Colonel
1002
Rep 2,287
Posts |
Quote:
The downshift alone will hold back full power for 800 milliseconds for the first generation ZF. I don't know about the GM gearbox but it sounds like it's worse. |
|
Appreciate
0
|
10-12-2016, 06:36 PM | #17 |
Colonel
1002
Rep 2,287
Posts |
On another note: I don't recall finding different drivers wish maps or torque maps for different transmissions.
|
Appreciate
0
|
10-12-2016, 06:50 PM | #18 |
Major General
3987
Rep 7,212
Posts |
could be. Might be able to look it up on MSV80 and see if it's been increased, although I can't imagine you'd want to increase it (800ms is already nearly a full second!).
Didn't you experiment with reducing the torque reduction time request? Or was that part from the EGS, and you were changing the torque reduction amount? |
Appreciate
0
|
10-12-2016, 07:06 PM | #20 | |
Colonel
1002
Rep 2,287
Posts |
Quote:
|
|
Appreciate
0
|
10-12-2016, 07:12 PM | #21 |
Colonel
1002
Rep 2,287
Posts |
I think the diesel guys are really close to releasing a tool that will allow EGS tuning. It's limited to the bigger boxes but I'm hopeful they will support the ZF 6 HP 19 in the near future. I keep pushing them and providing files anyways.
The are talking about $100.00 for the software "tool" and maybe a little more for a custom tune. |
Appreciate
0
|
Bookmarks |
|
|