335i coupe USA
Sorry for not writing in German... anyway people in the US are complaining a lot about the performance of the N54 engine (3.0L bi-turbo from the 335i) after the "upgrade" to the 29.2 or newer engine software. However I can't find any significant complaints in the german sites about this problem so I was wondering if this is a specific software downgrade for the US market?
My 335ci build date May 2008 doesn't have a lot of torque until at least 2500-3000 rpm, not as it is advertised (300Nm from 1,400rpm). And it seems like lots of people getting their software upgraded to the newest version get to see the behavioral chages in the engines as of late. Is this happening in Germany as well?
Danke!
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Zitat:
Original geschrieben von Huebie333
Hi,
I don't think that BMW would decrease the torque via a software update. Did you ask your BMW dealer concerning the matter?
Huebie333
In fact the issue was that the x35i motor had problems with the rattling of the wastegates. BMW apparently tried to fix that by modifying the motor software and opening the wastegates much longer, thus preventing any rattling. This also had the very negative side-effect that 1-2 seconds were necessary for the motor to generate the necessary torque (as much torque just disappeared into the wastegates), thus artificially creating a turbo-lag (although strictly speaking it is not due to the turbos). In the US forums many people complain about this, as it sort of castrates the motor and is totally contrary to BMW advertising a more or less immediate throttle response and lots of torque from 1500/min on. You can read the whole thread
hereif you're interested (warning: it's quite long).
The question is now whether the new facelift 335i still has the same problems, and whether there is a difference between the European and the US motor (I can't really believe that). So people who have just had their facelift 335i delivered should make the following try: In 5th gear (steptronic: M5), cruise at ~55 km/h (lugging the car and giving ~1500 RPM). Push the gas pedal 2/3 and leave it in that position. The car will accelerate and then, after ~1 second, will develop a second, bigger thrust. If you do this in high gear, it will have ~1800 RPM when the turbo power builds up. If it is like that, you have the so-called lag due to the progman update because the torque only develops much slower due to the opened wastegates.
Alpina_B3_Lux
7 Antworten
Hi,
I don't think that BMW would decrease the torque via a software update. Did you ask your BMW dealer concerning the matter?
Huebie333
Zitat:
Original geschrieben von exhumator
Sorry for not writing in German... anyway people in the US are complaining a lot about the performance of the N54 engine (3.0L bi-turbo from the 335i) after the "upgrade" to the 29.2 or newer engine software. However I can't find any significant complaints in the german sites about this problem so I was wondering if this is a specific software downgrade for the US market?My 335ci build date May 2008 doesn't have a lot of torque until at least 2500-3000 rpm, not as it is advertised (300Nm from 1,400rpm). And it seems like lots of people getting their software upgraded to the newest version get to see the behavioral chages in the engines as of late. Is this happening in Germany as well?
Danke!
I don't know, but my 135i has the 400 Nm from 1.500 rpm till 5.000 rpm (I think so?!). Is the characteristic of the US-engine different to the german one?
P.S.: It's nice to discuss in english. Oh my good. The last english-lesson is 7 years ago! I think, I can't hide that fakt.🙄
Zitat:
Original geschrieben von Huebie333
Hi,
I don't think that BMW would decrease the torque via a software update. Did you ask your BMW dealer concerning the matter?
Huebie333
In fact the issue was that the x35i motor had problems with the rattling of the wastegates. BMW apparently tried to fix that by modifying the motor software and opening the wastegates much longer, thus preventing any rattling. This also had the very negative side-effect that 1-2 seconds were necessary for the motor to generate the necessary torque (as much torque just disappeared into the wastegates), thus artificially creating a turbo-lag (although strictly speaking it is not due to the turbos). In the US forums many people complain about this, as it sort of castrates the motor and is totally contrary to BMW advertising a more or less immediate throttle response and lots of torque from 1500/min on. You can read the whole thread
hereif you're interested (warning: it's quite long).
The question is now whether the new facelift 335i still has the same problems, and whether there is a difference between the European and the US motor (I can't really believe that). So people who have just had their facelift 335i delivered should make the following try: In 5th gear (steptronic: M5), cruise at ~55 km/h (lugging the car and giving ~1500 RPM). Push the gas pedal 2/3 and leave it in that position. The car will accelerate and then, after ~1 second, will develop a second, bigger thrust. If you do this in high gear, it will have ~1800 RPM when the turbo power builds up. If it is like that, you have the so-called lag due to the progman update because the torque only develops much slower due to the opened wastegates.
Alpina_B3_Lux
Thanks for your answer!
Did the people in Germany get the same update to fix the wastegate rattle? Or just the people in the US? because I cant find any complains in this forum about the engine lag after the program update in Germany.
Danke!
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Zitat:
Original geschrieben von exhumator
Thanks for your answer!Did the people in Germany get the same update to fix the wastegate rattle? Or just the people in the US? because I cant find any complains in this forum about the engine lag after the program update in Germany.
Danke!
You will find a discussion in another BMW forum here:
http://www.auto-treff.com/bmw/vb/showthread.php?s=&threadid=214739The reasons for less discussion going on here are these:
1. There are much less 335i sold in Germany than are in the U.S. Over there, you only have two models, namely 328i and 335i. Here, the most common model is the 320d. 335i make only ~2% of all cars sold, as far as I know.
2. Shops in the U.S. do more software updates in general. In Germany, an update is only performed if there is a (voluntary) recall or a definitive reason for it. I have heard that the turbo-lag problem is limited to older, updated cars and does not apply to cars that were delivered with Progman >= v29.2 in the first place. I know that some people with cars built after 3/08 with MSD81 have complained about lag, but maybe they have a different problem. I cannot tell more yet, but I know that this is being scrutinized right now. So, it boils down to 2% of the whole BMW E9x population, of those only that were built before 3/08 and of those, only cars that have been upgraded after 3/08 - which is seldom done unless there are good reasons. I guess the affected fraction of the current E9x population is 3/1000 and then, the driver must still feel the difference, which is much less with Progman v31.1 than it was with v29.2.
Zitat:
Original geschrieben von redheat
I don't know, but my 135i has the 400 Nm from 1.500 rpm till 5.000 rpm (I think so?!). Is the characteristic of the US-engine different to the german one?Zitat:
Original geschrieben von exhumator
Sorry for not writing in German... anyway people in the US are complaining a lot about the performance of the N54 engine (3.0L bi-turbo from the 335i) after the "upgrade" to the 29.2 or newer engine software. However I can't find any significant complaints in the german sites about this problem so I was wondering if this is a specific software downgrade for the US market?My 335ci build date May 2008 doesn't have a lot of torque until at least 2500-3000 rpm, not as it is advertised (300Nm from 1,400rpm). And it seems like lots of people getting their software upgraded to the newest version get to see the behavioral chages in the engines as of late. Is this happening in Germany as well?
Danke!
P.S.: It's nice to discuss in english. Oh my good. The last english-lesson is 7 years ago! I think, I can't hide that fakt.🙄
not at all ;-) "god and fact" and "has been"
😁
lg
Peter
Thank you - that was extremely helpful. Mine is built in 5/2008 and has the 29.2. I never thought I'd ever regret getting a BMW, even my old 318i was more responsive then this 335ci. Big big big disappointment ... :-(
Zitat:
Original geschrieben von meyergru
You will find a discussion in another BMW forum here: http://www.auto-treff.com/bmw/vb/showthread.php?s=&threadid=214739Zitat:
Original geschrieben von exhumator
Thanks for your answer!Did the people in Germany get the same update to fix the wastegate rattle? Or just the people in the US? because I cant find any complains in this forum about the engine lag after the program update in Germany.
Danke!
The reasons for less discussion going on here are these:
1. There are much less 335i sold in Germany than are in the U.S. Over there, you only have two models, namely 328i and 335i. Here, the most common model is the 320d. 335i make only ~2% of all cars sold, as far as I know.
2. Shops in the U.S. do more software updates in general. In Germany, an update is only performed if there is a (voluntary) recall or a definitive reason for it. I have heard that the turbo-lag problem is limited to older, updated cars and does not apply to cars that were delivered with Progman >= v29.2 in the first place. I know that some people with cars built after 3/08 with MSD81 have complained about lag, but maybe they have a different problem. I cannot tell more yet, but I know that this is being scrutinized right now. So, it boils down to 2% of the whole BMW E9x population, of those only that were built before 3/08 and of those, only cars that have been upgraded after 3/08 - which is seldom done unless there are good reasons. I guess the affected fraction of the current E9x population is 3/1000 and then, the driver must still feel the difference, which is much less with Progman v31.1 than it was with v29.2.