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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > BMW Technician explanation for turbo lag



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      09-15-2008, 11:23 AM   #45
FunRevn
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V30.2 has been available for a while now.....
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      09-15-2008, 12:05 PM   #46
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Originally Posted by FunRevn View Post
V30.2 has been available for a while now.....
Not at all the dealers - as far as I understand, all dealers should have it this week. I guess I should make sure what I have installed...
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      09-15-2008, 12:07 PM   #47
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Not at all the dealers - as far as I understand, all dealers should have it this week. I guess I should make sure what I have installed...
No, they've had that for a month or so at least. V31 is the one coming out this week.
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      09-15-2008, 12:08 PM   #48
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No, they've had that for a month or so at least. V31 is the one coming out this week.
Ah, my mistake... that means I probably have V30 and it definitely has more turbo lag than v27, I'll try to find out what v31 improves...
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      09-15-2008, 12:38 PM   #49
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I don't know if it has been discussed before, but is the problem with the wastegates, the wastegates themselves, the activators or the vacuum control system?

I ask, because if one assumes that later software revisions will still only act as a band aid for the underlying problem, the cost to BMW would be quite different depending on which part of the wastegate system is causing the problem.
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      09-15-2008, 12:48 PM   #50
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I agree with both.
Good job Shiv.

Now that someone within BMW has FINALLY admitted that the new programs induce more lag (as those with the reflash have said all along) BMW needs to rectify the issue for those who got reflashed.
They bought (or leased) the car based on their initial driving experience.
You alter that vastly and it's not what you paid for or agreed too.

Funny how in the fine print, BMW can void your warranty or negate your deal if you "alter" the car in anyway, but if THEY alter the car in a NEGATIVE way, the person paying the bill has no recourse?

BMW better fix it fast, or if I were you reflashed guys, I'd be on the phone weekly with them until they take care of you in some way, shape, or form.
Good point
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      09-15-2008, 08:43 PM   #51
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Originally Posted by BzzzBom View Post
I found this on 1addicts.com from bimmertech. I have also attached my response. Please comment:

Quote:
Originally Posted by bimmertech
i actually don't belong to e90. and i actually haven't done a fuel pump in quite a while. v30.2 (the most current software version) has no affect on vehicles produced 3/08 which had a software level of 28.2 from the factory. the last software version that affected how the high pressure pump was controlled by the dme was v24.2 which only affected early production e9x and e6x. the lag that people tend to complain about after programming rather is caused by the nature of how the wastegate actuator is controlled. in pre-v28.2 vehicles, one wastegate was closed at idle to reduce lag. however due to the wastegate rattle noises v28.2 opened both wastegates up to eliminate the rattle, however this caused a slight lag below 3000 rpms. bmw has yet to address this issue. this really should only affect people with pre 03/08 build dates.


Thank you for the explanation but I am having trouble following it. If post 3/08 vehicles have v28.2 from the factory and v28.2 has "a slight lag below 3,000 rpm" due to opening both wastegates, how could [lag] only "affect people with pre 3/08 build dates?" Shouldn't post 3/08 cars, which have factory v28.2 plus pre 3/08 cars updated with v28.2 all have the lag? Are you saying that pre 3/08 cars which were updated to v28.2 have lag but factory v28.2 post 3/08 cars don't? Please clarify.
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      10-06-2008, 09:40 PM   #52
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Any updates here? Has anyone gotten v31 and can comment on what it does to performance? If I recall appropriately from the 29.2 mega-thread, there were rumors that v31 were NOT going to fix anything with lag... any real data from you guys?
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