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  #1  
Old 03-26-2010, 04:24 PM
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Exhaust "pop" at redline shift.... normal?

Thanks, all.

With the nicer weather upon us, we've (OK, I'Ve) had a chance to get on it a little, with some fun 100-240kph runs (on a closed track, naturally..... ).

I'm noticing that when I'm on full throttle, and it's shifting at redline, just as it shifts, I am hearing this little "pop", or "puff", from the exhaust. This happens when I am in "non-M" mode (M button not engaged), and with M button pressed.

I actually think it sounds MEAN, and kinda like it, but just wondering if anyone else is getting it.

BTW - this thing is crazy fast for something that weighs this much!!!

Love it.


thanks everyone.
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Old 03-26-2010, 04:35 PM
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sounds like a nice bit of turbocharger wastegate overrun to me. But I'll let the others chip in! Good to see you're letting the beast off the leash!

<EDIT> interestingly I then went and looked it up on wikipedia and found this

Wastegate - Wikipedia, the free encyclopedia
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Last edited by StumpyPete; 03-26-2010 at 04:50 PM.
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Old 03-26-2010, 04:46 PM
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Quote:
Originally Posted by TTBear View Post
Thanks, all.

With the nicer weather upon us, we've (OK, I'Ve) had a chance to get on it a little, with some fun 100-240kph runs (on a closed track, naturally..... ).

I'm noticing that when I'm on full throttle, and it's shifting at redline, just as it shifts, I am hearing this little "pop", or "puff", from the exhaust. This happens when I am in "non-M" mode (M button not engaged), and with M button pressed.

I actually think it sounds MEAN, and kinda like it, but just wondering if anyone else is getting it.

BTW - this thing is crazy fast for something that weighs this much!!!

Love it.


thanks everyone.
Thats quite normal and even with shifting at 4.000 and higher in manual or with m-mode y'll get the chance to hear it. Thats a special programming by BMW for the exhausts. Enjoy
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Old 03-26-2010, 07:21 PM
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Yup, totally normal. I hear it at almost every shift. :-p
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Old 03-27-2010, 06:34 PM
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blow offs on the wastegate
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Old 03-28-2010, 03:12 AM
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Thanks for the comments, everyone.

Good to know.

And yes, I am lovin' it
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Old 03-28-2010, 12:52 PM
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Quote:
Originally Posted by jst2878 View Post
blow offs on the wastegate
Why would the wastegates change with a shift (on the exhaust side of the turbo)? Wouldn't it more likely be a pressure wave on the compressor side?
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Old 03-28-2010, 06:23 PM
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yep I hear this quite a bit under heavier acceleration when changing gear at higher rpm
love it
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Old 03-28-2010, 06:30 PM
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The Burp.

Love the truck!

K
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Old 03-29-2010, 09:42 AM
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No idea what it is but I hear it. Also, nothing better than that great sound when you let off the throttle at higher RPM with M on. Just terrific.
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