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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Throttle lag--its an automatic tranmission thing!



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      10-12-2016, 07:50 AM   #1
rothwem
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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..
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      10-12-2016, 09:17 AM   #2
InControl
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Wrong. It's not the AT as mine has no lag. It's how you use the AT. Try driving it in manual mode for a week with an update. You won't regret it.
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      10-12-2016, 09:29 AM   #3
bimmerquick43321
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my auto is fine in manual mode as well, it's not a racing car I don't expect instantaneous response
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      10-12-2016, 09:42 AM   #4
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Quote:
Originally Posted by InControl View Post
Wrong. It's not the AT as mine has no lag. It's how you use the AT. Try driving it in manual mode for a week with an update. You won't regret it.
okay, it's not the AT, you have to drive it in manual mode, but in Auto mode it's laggy, but it's not the AT? Huh?

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.
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      10-12-2016, 10:20 AM   #5
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Quote:
Originally Posted by hassmaschine View Post

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.

Haha I think all reviews I've read on AA mentioned how they thought the throttle response improved
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      10-12-2016, 10:39 AM   #6
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100% placebo. One possibility is their adaptations got reset but there's no throttle mapping changes.
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      10-12-2016, 11:36 AM   #7
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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.
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      10-12-2016, 12:10 PM   #8
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Quote:
Originally Posted by hassmaschine View Post
okay, it's not the AT, you have to drive it in manual mode, but in Auto mode it's laggy, but it's not the AT? Huh?

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.
Oh mine, another one of those. Let me than propose this analogy. Joe finds his stick car lagging, but he admits sucking at shifting, particularly having trouble finding the g spot for clutch engagement. Hass are you with me? The manual box is fine Joe is the problem.
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
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      10-12-2016, 12:22 PM   #9
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what's the point in an auto that you have to shift manually...
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      10-12-2016, 12:42 PM   #10
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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
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      10-12-2016, 03:36 PM   #11
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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.
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      10-12-2016, 04:15 PM   #12
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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 :-)
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      10-12-2016, 05:03 PM   #13
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It's not any louder unless you're not sensitive with throttle where as in auto zone you'll be in lower rpm unless aggressively accelarating
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      10-12-2016, 05:16 PM   #14
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      10-12-2016, 05:44 PM   #15
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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.
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      10-12-2016, 06:30 PM   #16
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Quote:
Originally Posted by hassmaschine
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.
I think there problem is related to the torque reduction during the shift. In D or better stated "comfort mode" and general cruising the gearbox will settle in at a pretty high gear keeping the RPMs low. Once the TPS is pushed harder you need to run through the cycle of ECUs recognizing the demand , gearbox down shift and torque reduction request during the shift.

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.
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      10-12-2016, 06:36 PM   #17
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On another note: I don't recall finding different drivers wish maps or torque maps for different transmissions.
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      10-12-2016, 06:50 PM   #18
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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?
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      10-12-2016, 06:55 PM   #19
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My 6mt 330i lags pretty bad stock. I got a sprint booster throttle remap that helps correct that.
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      10-12-2016, 07:06 PM   #20
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Quote:
Originally Posted by hassmaschine
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?
Ya, I reduced the time limit on the torque reduction request. Completely changed the cars personality. If you are light footed you don't know the difference but push on the throttle and each gearshift is a good kick.
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      10-12-2016, 07:12 PM   #21
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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.
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      10-12-2016, 07:16 PM   #22
hassmaschine
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Somebody was going to maybe send me an EGS to disassemble. If they are able to make a flash tool work I might be able to map it out.
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