08-25-2014, 09:17 PM | #23 | |
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08-26-2014, 07:19 AM | #24 | |
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http://www.accessecu.com/accessport/...S3%20v1.01.pdf Another reference, also from Cobb, discusses the Ford Focus ST. The revision notes for the 3 Stages had some salient points, especially discussing the 'pedal response' - http://static.cobbtuning.com/cobbtun...ST_BASE_13.pdf Finally, a Formula 1 site discusses Engine Torque and Pedal Maps - http://www.formula1-dictionary.net/e...orque_map.html Somewhere in this mix the problem surely must reside... |
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08-26-2014, 01:57 PM | #26 |
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Nope, problem doesn't go away. Sport mode just makes you have to push throttle less to get more acceleration; does nothing for the pause, in fact it can make it worse because once the pause stops the acceleration is that much more jerky.
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08-26-2014, 02:25 PM | #27 |
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Like I said, your problem is likely something else other than the transmission. Our 35i is almost too jumpy when I gas it.
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08-26-2014, 03:08 PM | #28 |
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2011 X3 35i
Had a significant lag in our 2011 35i, same long delay as mentioned by others here. This was a known issue with early X3s with the N55 engine. Problem was resolved with software update. No more hesitation, just smooth flow of power.
Probably a result of BMW trying for better fuel economy but certainly not desirable from a safety point of view. There are some after-market solutions available, but I'd try the dealer and a software update first. |
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08-26-2014, 03:22 PM | #29 |
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It would seem helpful if BMW had a factory-approved testing facility with an AWD dynamometer and software capable of analyzing the 'drive-by-wire' tree components shown in that 1st pdf link I shared. One would have a closed and reproducible system on which many X3s could be evaluated (including 'normal controls' to insure accuracy and precision). With computer processing ability nowadays, it doesn't seem a stretch to expect the graphs from suspect and 'normal' X3s to show variances. Granted not all of us could ship our X3s across the country, but if one center near a major metro area could be assigned the task of analyzing the issue, then perhaps corrective ideas could be disseminated to Service Centers worldwide, especially if the issues boil down to only a few sources.
Then again, maybe they have already done this and we just don't know about it. |
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08-26-2014, 03:26 PM | #30 |
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Sorry - was typing so didn't see Pitiful Old Man's comments before I submitted mine. I was under the impression all firmware and software updates were done with major maintenance milestones without the consumer having to ask for their vehicle to be updated?
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08-26-2014, 04:12 PM | #31 |
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My car is a 2013, software should be up to date, as the people having the big issues with throttle were handled well before I got my car. Would be odd they'd still be shipping cars in mid 2013 with old/faulty software if it was already a known issue. Been to dealer for 2 service meetings, I'd think they'd apply updates if any were needed as well, they have applied software updates, but not sure if that included any throttle issues or not.
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08-26-2014, 04:35 PM | #32 | |
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As one who likes to see data, especially when it is reasonably attainable, it is frustrating to not be able to decipher what should be a rather straightforward diagnostic algorithm. |
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08-26-2014, 07:16 PM | #33 |
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I agree. I wish we had access to some of this data to see what trends there are. I wonder if there are multiple manufactures for specific key parts that could be causing this? Seems odd some of us have this issue, some don't.
Very frustrating, nonetheless. Happens multiple times a day... |
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08-27-2014, 11:44 AM | #34 | |
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For the X3 I even bought a sprint booster thing to see if that helped with the lag issue. It does help with pedal feel, but didn't solve the lag problem. It is not an X3 issue, as I've searched other forums and it appears to be a sporatic problem to those with 8 speed tranny and mostly 35i engines. I'd generally have no complaints about this car except for this 1 annoying issue. I wish I had the tools or knowledge to get to the bottom of this, but unfortunately that's not the case. Multiple people have visited dealer and no solution to be had. I've got a year left on my owner's choice program and I'm just going to turn it in rather than buy it out, which was original plan.
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08-30-2014, 10:14 PM | #35 | |
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08-30-2014, 10:29 PM | #36 | |
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IMO, your comments require more info. If you are having heavy throttle lag issues and you are tapping through your own gears in Sport and Sport+ mode, I would be at the dealer (you may be having problems with the ETC, ATC...etc.) screaming hell. It is obvious there is something wrong with your vehicle and it could be quite dangerous. You say it is a faulty part or flaw because some have it and some don't (and that it's sporadic), so I ask, why are you still driving it? Did you just get it? Was it new? If you took it to the dealer, are they not being helpful, can't find anything wrong etc. I ask because I am curious. It would be helpful to me (and maybe others) if you could give specific examples of when it occurs so that others can try and replicate it in their X3s...mode, speed, gear, stomping pedal, rolling pedal, road conditions etc. Was this an issue before you installed the JB1 (I see it in your sig) or after? What break-in procedures (if new or none) did you follow? Basically anything that can pinpoint when and/or why it happens. Again, just trying to help. That's what the these forums are for.
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09-01-2014, 01:28 PM | #37 |
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Not being defensive at all. The lag is an annoyance, it's not like it pauses more multiple seconds. I thought I spelled out when issue occurs, but if not here goes...when driving at lower speeds and then change lane and attempt to quickly accelerate it's a 50/50 if it will have brief pause and then accelerate, when coming to what I'd call a rolling stop and then accelerate same deal, lastly when making a slow turn following near stop same deal.
Only seems to be in first 2 gears and also with changing lanes at those low speeds. It's almost like traction or stability control is taking over, but no lights indicating that not am I mashing pedal to floor, just normal pedal pressure. Problem exists with and without jb tune. Got car new, typical break in, nothing. special just didn't beat on it for a couple months. I've been to the dealer, others have too, no faults found. After warm up car is always in sport mode I've searched other forums and it's not terribly uncommon elsewhere too. Not gonna spend time linking other's issues but simple google search for bmw throttle lag or hesitation lag gets plenty of results across multiple BMWs and years. My car exhibits similar traits as what pre-2012 cars did, problem is I've got a 2013 with current software. It's not in a dangerous state, I know how' the car is going to react to my inputs, it's annoying and I'll move on to a new platform next Summer to resolve.
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09-02-2014, 11:33 AM | #38 | |
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09-02-2014, 12:40 PM | #39 |
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I have a 2013 28i that is doing the hesitation thing. I took in for service and told them about the hesitation. They did a software update and the car drove like a new one for several days. No noticeable hesitation. However in a months time it is starting to do it again. I have theory about this. I used to drive quite a bit in econ pro mode on trips and all of a sudden it hit me that this hesitation that happens sometimes feels like maybe the car is somehow is getting confused and slipping in and out of not econo pro really but the throttle response part of it. That may sound far out but if you are in comfort mode and the throttle one time responds as you would expect then for no apparent reason it responds as if you have it in econo pro mode it would maybe exhibit the characteristics we, or at least I, am feeling. Does this make sense to anyone else?
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09-02-2014, 02:57 PM | #40 |
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2013 35i here.
Lag is definitely present. When I bought the car, I was test driving 2012's and there was a noticeable lag on starts (from a red light, etc). When I picked up my car, I had read all the rumblings on the forum about a software update and on starts it felt like it was resolved. With more seat time, I've noticed that there still is a 0.5-1 sec hesitation when already rolling and hitting the throttle. The most noticeable scenario is when making a lane change from a lane that's stopped ahead, with traffic closing quickly in the left hand side view mirror. It's so predictable that I've adjusted my driving accordingly, hitting the pedal a fraction of a second earlier than I should have to. My feeling is that it's drive by wire based and not transmission. Often when this happens, there's no discernible gear change. |
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09-02-2014, 07:31 PM | #41 | |
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The hesitation in our 2011 (no econo pro mode in those days) was clearly not due to the transmission since it occurred on starts as well as at partial throttle. It was greatly improved in sport/sport+ mode. Seems like there might well be a slew (that's a technical term) of potential causes for throttle lags. Nonetheless, a 0.5 - 1 second delay is just not acceptable; it becomes a safety hazard. I'll bet that if the NHTSA called them out on it, BMW would solve the issue. |
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09-03-2014, 12:45 PM | #42 |
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I have not used the econo pro mode since the software update because I suspected that it might be recalibrating the transmission to a less responsive mode. Since the problem has returned I have intentionally driven more aggressive with hope that it would have some effect. I also did a transmission reset and it seems to not have helped. On my car the fact that it is not consistent is the part that really bugs me. As someone noted above when I need to accelerate quickly to change lanes or something it seems to decide to do it at that moment and then it may drive and accelerate like normal for awhile. I am just never sure if I am going to have the lag or not.
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09-25-2014, 12:49 PM | #43 |
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I have a new 2015 LCI x28i non DHP with a lag issue. The problem is most noticeable when accelerating from a stop or when I've slowed down a lot then hit the gas (ie, braking into a low speed sharp city street corner then accelerating out). The issue exists in Sport, Comfort and Eco modes, as well as in manual mode. The length of delay is not consistent. Punching the pedal to the floor often shortens the delay, but not always. I'll be bringing it up with the dealer at it's first service. Overall the programming of the transmission seems somewhat sloppy. Sometimes when I go to pass someone the shift is violently abrupt, like I've dropped the clutch, at other times it's a smooth transfer. The auto transmission in our 4Runner is much more predictable.
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09-25-2014, 04:43 PM | #44 | |
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