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      08-10-2012, 10:51 AM   #1
weixp386
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N20 Problem?

Hi all,

I just got my 328i (sport line) 3 days ago and absolutely love it; but today I noticed something. When I slowly rev the engine to approx. 3000 rpm while at a stop, I noticed that the car shakes a little bit (probably for 0.1 of a second) and at the same time the revs drop down to approximately 2800 rpm. It only did it this morning. When I tried it again this afternoon, it was normal again. It almost felt like the engine (either the variable valve timing or the twin scroll turbo) is trying to make an adjustment for the increase in revs, but I just want to make sure this is normal.

Can anyone please try this and let me know if you are experiencing the same thing?

Thanks in advance.

Last edited by weixp386; 08-10-2012 at 12:58 PM..
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      08-11-2012, 12:11 PM   #2
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The engine will respond differently when not under load remember. Not experienced this but I've not looked for it to be honest!
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      08-11-2012, 04:45 PM   #3
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I got the same problem but since I'm a new owner of 328i i have to say base on my experience with other cars.... might be auto on/stop engine kicking in.
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      08-11-2012, 08:20 PM   #4
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Quote:
Originally Posted by Robz_328i
I got the same problem but since I'm a new owner of 328i i have to say base on my experience with other cars.... might be auto on/stop engine kicking in.
Definitely not ASS lol, otherwise it would drop from 3000rpm to Ready! Wouldn't worry about it guys! Unless it does it under load (whilst driving), I'd forget about it.
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      08-11-2012, 11:27 PM   #5
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Quote:
Originally Posted by SomeRandomer123 View Post
The engine will respond differently when not under load remember. Not experienced this but I've not looked for it to be honest!
Quote:
Originally Posted by Robz_328i View Post
I got the same problem but since I'm a new owner of 328i i have to say base on my experience with other cars.... might be auto on/stop engine kicking in.
Quote:
Originally Posted by SomeRandomer123 View Post
Definitely not ASS lol, otherwise it would drop from 3000rpm to Ready! Wouldn't worry about it guys! Unless it does it under load (whilst driving), I'd forget about it.
Thanks for your replies guys. I found out why. Mine has manual transmission; and when I rev the engine, I tend to have the clutch stepped down and transmission engaged in 1st. Apparently, BMW put in a rev limiter that limits the engine to about 3k to 3.5k rpms when the clutch is disengaged. When I was reving the engine, my revs went down because I hit the limit. Not sure why BMW did this though.... I was thinking it can be some kind of "launch control" type of thing that would make launches more efficient by limiting unnecessary rubber burning when engaging the clutch fast.

What do u think?
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      08-12-2012, 07:32 AM   #6
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Oh really? Now that's interesting!

Well, I and many others will tell you that revving the engine high without load is bad for it. So beyond 3k is not good for it.

Which components suffer? I don't know, and it seems many others don't know either!

Perhaps that's why they put a limiter in.
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