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E82 / E88 1 Series (2008 - 2013)
BMWs throw back to the iconic 2002, with a renewed form and function. The smallest car in BMW's line up but still packs a punch. Available in coupe or convertible, powered by either an inline 6 in the 128 or the twin turbo rocket sled 135.

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  #1  
Old 08-17-2013, 03:10 PM
jester17 jester17 is offline
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Location: Elizabethtown, PA
 
Join Date: Aug 2011
Posts: 9
Mein Auto: 2011 135i MSport
Dyno Question

Hello All:

Just had my 2011 135i dyno-ed -- on the first pull, the engine red lined briefly at about 7,500 RPM before "coming back," (it was just a quick spike at just under 7,500) and pushed some dark grey/black smoke out of the exhaust for a few secs. This black smoke was (probably) from:

1) Oil burning off from somewhere
2) Carbon burning off the intakes
3) Something else that's insignificant
4) Something else that's significant
5) None of the above, I don't know what the hell I'm talking about.
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  #2  
Old 08-18-2013, 11:34 AM
mr_bean mr_bean is offline
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Location: NJ
 
Join Date: Mar 2009
Posts: 688
Mein Auto: 2000 328i
Dyno Question

The answer is #3

The engine runs very rich when the throttle is wide open and the RPMs are high. This was probably just extra fuel trying to burn off but it didn't have enough oxygen to do it cleanly.


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