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Lag from dead stop
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06-18-2013, 04:00 PM | #23 |
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Drives: C6 Z06, 09 335i, 10 335xi
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The so called lag is just the drive by wire system. It's sort of a safety and comfort mechanism. If the throttle is too abrupt at the onset of depressing it would make the car jumpy and jerky.
Tunes can help a little but it's just the nature of a car with a drive by wire. Last edited by Jeff@TopGearSolutions; 06-18-2013 at 04:07 PM.. |
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06-18-2013, 10:35 PM | #25 | |
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I get that there's a long path to get there, but I've driven plenty of turbo cars w/ electronic throttle and they don't have the same issue. Plus it's not that it takes a long time for the air to move, it's that nothing happens and then it hits. Turbos aren't spooling so it shouldn't respond like that. And my previous IS350 was DI and it didn't have the same lag. There was a tiny lag in throttle, but after the ECU adapted, it was gone. Nothing like the 335. You'd think that with it being electronic, they could compensate for the lag.
Oh well, nothing to be done anyways. Just something to live with. Quote:
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06-18-2013, 11:52 PM | #26 | |
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I've had my car a about 6 weeks and had trouble on take off - thought I just had to get use to the car. In the last week or so, the car got use to me. Pulling away from a stop sign is much smoother. My old 330 had drive-by-wire that adapted to your driving style and got slower and slower, but you could reset it by having the key in accessory start (not turning over the engine) and then turning the key off and turning the car back on. Does a 335 have a procedure like that for wiping the "adapts to your driving style" memory? I'm thinking not - I sure haven't found anything on it here. There are times when a smooth start is good but I want it only when I want it. edit> This is on an auto but it shouldn't make a difference if it is a throttle issue. Last edited by Colo M/Sport; 06-19-2013 at 11:18 AM.. |
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06-19-2013, 09:46 AM | #27 |
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I don't notice much if any drive-by-wire lag as I notice what I think is torque management when I floor it in 1st gear (6AT). It's as if I'm getting 60% throttle in first with gas pedal floored. Then 2nd gear and thereafter feels like WOT.
Anyone else know what I'm referring to? Does a tune fix this (1st gear "torque management?") DTC fully off btw. |
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06-27-2013, 01:02 PM | #28 |
08 335I Sport,Premium,Auto,Blk/Blk,JB4,DCI,Alpina
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Throttle lag fix kinda
Well once the JB4 adapted, the lag came back but if I reset it back to learning, it improves for awhile. I did find one thing that has helped a tremendous amount and would indicate it is a control problem, not lag. When I come to a stop light, I flip the shift paddle back and it goes to M2. It virtually fixes the problem and makes getting into traffic much easier with virtually no lag and you can use as much throttle as you like. You can use M1 but it is more abrupt than M2.
My SL600 was the same way because it starts from a stop between 1st and 2nd gears (huh?). If you selected first or second manually it was much better. Please post your experience with this. TIA Last edited by lconn; 06-27-2013 at 01:03 PM.. Reason: additional info |
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06-27-2013, 02:35 PM | #29 | |
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06-27-2013, 05:56 PM | #30 | |
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Is this normal? I've felt it on other newer cars. They tune the ecu from the factory to limit WOT in 1st gear to a) not let you break the tires lose for safety reasons and b) save the drivetrain so they don't pay out large sums of money for warranty repairs. |
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06-27-2013, 07:23 PM | #31 |
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Not sure I haven't heard of stock cars doing that but defiantly not saying they don't. I did experience the same thing you are describing on my Stage3 Audi 1.8T. First gear would never build as much boost as the other gears. I dont know if it was programed like that I just always assumed it was geared to low to need all of the boost based on the load targeting system.
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07-29-2013, 01:02 PM | #32 |
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Maybe this thread can help you out http://www.e90post.com/forums/showthread.php?t=791297
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07-29-2013, 10:02 PM | #33 |
08 335I Sport,Premium,Auto,Blk/Blk,JB4,DCI,Alpina
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Had a new 535i loaner while the 335 was in the shop. It does NOT have the same lag as 335. Part of that may be the n54 vs n55 but it feels like the drive by wire.
I bought the car as a CPO with 35k on it and it has done it since day one. If it can do it properly in M2, it's software. The nice thing about putting it in M3 with the paddles (other than they finally have a use) is once you get going the tranny automatically goes back to regular drive. |
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07-29-2013, 10:11 PM | #34 |
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I've heard folks talk about turbo lag, but I can say I don't think I've ever noticed it. I have an MT, would that be why? ???
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Tony ------------------------------------------------------------------------------------------ '07, e92 335i, Sparkling Graphite, Coral Leather, Aluminum, 6-speed |
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