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Has anyone contacted BMW regarding 29.2 and lag?
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10-26-2008, 11:00 AM | #2509 |
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I have now done 1100 miles since the fix...
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10-26-2008, 11:02 AM | #2510 | |
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I delayed in posting my findings, so that I could assess the car over a period of several days in case any other symptoms or issues became apparent. So far, nothing untoward has happened, and I have now covered 1100 miles since the fix
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10-26-2008, 12:05 PM | #2512 |
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10-26-2008, 01:26 PM | #2513 | |
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10-26-2008, 01:34 PM | #2514 | |
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V29.2 + accurately calibrated wastegate linkages DOES NOT fix the instances of turbo lag, as that version of software still keeps the wastegates open at low revs, regardless of the calibration of the linkages. Basically, the turbo lag issue is down to two problems - 1) V29.2 software, which is rubbish, 2) sticking/incorrectly calibrated wastegate actuators
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10-26-2008, 02:00 PM | #2515 |
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Hi, I'm a newbie here.
I'm usually very good at reading all previous post before I post a questions but... 115 pages aren't that easy to keep my routine. So.. can anyone tell me some summary? I have a June 2008 built date335i coupe and I never drove previous version 335i what so ever. (and this is my first turbo car). Does anyone know that which version I have on my coupe? Thanks in advance.
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10-26-2008, 02:16 PM | #2516 |
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10-26-2008, 02:55 PM | #2517 |
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I'd love to know which version after 29.2 improved the wastegate situation, is 31.1 the best or might 30.0.2 be just the same? coz that's what I have....and I'm clutching at straws here. July build btw.
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10-26-2008, 03:20 PM | #2518 | |
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Apparently, v31.1 is WAY better in that respect but still relies on non-faulty hardware. |
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10-26-2008, 04:05 PM | #2519 |
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At least it looks like there is going to be a solution on the horizon for everyone, possibly. At least it seems there is a good fix. Question is, will BMW come up with it for you all? I hope so. I would love to get my car knowing that if it is 29.2 that I can put 31.1+ on it and it will be how it should be.
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10-26-2008, 04:09 PM | #2520 |
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What ECU v. might the cars fabricated in the end of september have ?
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10-26-2008, 05:01 PM | #2521 | |
Read the manual please, just do it before asking!
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Is this: "The actuator positioning is entirely arbitrary, and when setting up the system on my car, we had two master techs, two senior techs, and myself trying to decide how it should be set. In the end, we decided to err on the side of tighter than looser, and rebuilt the engine for testing." The same thing as this post?: http://www.e90post.com/forums/showth...light=29.2+fix Do you realize that your post my be the total explanation to the lag issue and the strange thing with differences between individual cars with the same software! Thanks /Tobias |
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10-26-2008, 05:14 PM | #2522 | |
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From a butt dyno point of view, V31.1 is considerably more responsive than V30.0.2 which we have tried on my car, without much success...
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10-26-2008, 05:16 PM | #2523 |
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Hard to say - depends on the production line number. Either V30.0.2 or V31.1
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10-26-2008, 05:16 PM | #2524 | |
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V31.1 will be fine, assuming there is no existing hardware issue/problem with the existing actuators Herein lies the problem - you won't know if there is any problem until you upgrade to V31.1. Then, after the upgrade you will have to judge the rattle and engine responsiveness yourself
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10-26-2008, 05:22 PM | #2525 | |
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10-26-2008, 05:22 PM | #2526 | |
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Not really the same thing - yes, both instances require adjustment of the actuator arm, however Mr.5's remedy was purely visual, and had no vacuum pressure to accurately determine the correct positioning. It is vital that there is the correct pressure in the system to replicate a running engine, and so the arms can be setup accordingly. From our testing of other 335i's in the workshop at the time, it seems that this is a reasonable explanation as to why some cars perform ok, and others don't, whilst all being on the same software iteration. Remember, not all cars have faulty actuator arms. I drove a late 2006 car with 55k miles on the clock, and it was largely faultless - certainly it didn't have any rattles. However, a March 2007 car I drove had a slightly laggy response and exhibited a little rattle, even though that had done less than 14k miles. Both times, the ECU adaptations had been completely reset to give a level playing field. After giving the March 2007 car the same remedial fix, it was completely back to it's normal linear self, with no lag, no rattle, and relentless and seamless acceleration. Two cars, totally fixed...
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10-26-2008, 05:28 PM | #2527 | |
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However, I can tell you that the following process will enable you to have the problems remedied.... The PUMA update that instructs the dealers on what to do refers to a "Clanking from the engine". If a customer complains that there is this rattling or clanking, then the dealer should look at the list of ongoing PUMA cases. On reading this particular PUMA, it gives very very clear instructions on the procedure to remedy - 1) Update software to V31.1 - if no improvement is noticed, then move on to stage B 2) Stage B - remove the turbos and inspect the actuator arms for movement and calibration. In almost all cases, replace the actuator arms on both turbos and reset using vacuum line machine At no stage do the turbos require replacement. ECU adaptations must be reset If a dealer refuses to acknowledge there is a problem with your car, direct them to their computer and request they bring up the list of PUMA cases. If they still don't play ball, tell them you will contact BMW Customer Services and post a formal complaint, safe in the knowledge that there is an officially recognised problem and remedy. You must ensure, and get the dealer to verify, that their vacuum line machines are calibrated correctly. If they try to palm you off with the "don't question us, we're the dealer and of course it's ok" bollocks, contact BMW UK directly and request confirmation that the machine in use at that dealer has been verified. Remember, of all the machines that were tested, only three had passed. I don't know whether all the machines in use have been replaced as of yet - it took ten days just to get a new machine from BMW Germany sent over to BMW UK (whose own machines were completely out of tolerance). Alternatively, take a trip down to London and book your car in at BMW Battersea (which is the official BMW UK-owned service centre) and I guarantee the work will be done properly and accurately!!
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10-26-2008, 05:41 PM | #2528 |
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Maybe I'm in luck. I'm taking my 1,600 mile car to the dealer tomorrow. When warm it sounds like a diesel with the bonnet (hood for our US friends) up, there's a fast ticking, I've been thinking it sounds like a lifter but maybe it's not. Here's hoping I get 31.1
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10-26-2008, 05:48 PM | #2529 | |
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The ticking at idle is not the wastegates - it's the piezo fuel injectors doing their thing (and it is completely normal). The rattle from the wastegates is normally on the downward deceleration of revs - if you blip the throttle and rev in neutral to say 4000 revs, then abruptly shut the throttle, you might hear a rattling sound as the revs fall. That rattle is the wastegate, and that is what you should be reporting. Incidentally, which dealer are you going to see?? Are you anywhere near London? I only ask this because if you aren't that far away, it would be by far the best place to take your car. There would be no need for extensive investigation or any back-and-forth discussion, because they have been through it all with my car and are fully aware of every single remedial procedure required!!
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10-26-2008, 06:16 PM | #2530 | |
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Thank you very much! You are great. And The PUMA update that instructs the dealers on what to do refers to a "Clanking from the engine". If a customer complains that there is this rattling or clanking, then the dealer should look at the list of ongoing PUMA cases. On reading this particular PUMA, it gives very very clear instructions on the procedure to remedy - Could it be called PUMA in non english spoken countries? As it would be a bit difficult to explain for SA here what I want. Thx!
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