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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > does overboost work in all drive modes. anybody know??

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      06-26-2017, 06:12 PM   #1
carl44
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does overboost work in all drive modes. anybody know??

Ive been playing around with a rolling starts @2k-6k in first gear. Sport plus breaks the wheels louse. maybe its just the throttle mapping reduces the lag time for spool up? comfort builds slower less to no wheel spin and sport is in between .
think that over-boost is only in sport + or its just the quicker throttle mapping?
did some searching cant really find anything. carl
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      06-26-2017, 07:10 PM   #2
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here is a thread here. http://f87.bimmerpost.com/forums/sho....php?t=1190812

Not sure if it has a definitive answer though. I'll read through it myself in a bit.
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      06-26-2017, 07:20 PM   #3
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Quote:
Originally Posted by carl44 View Post
Ive been playing around with a rolling starts @2k-6k in first gear. Sport plus breaks the wheels louse. maybe its just the throttle mapping reduces the lag time for spool up? comfort builds slower less to no wheel spin and sport is in between .
think that over-boost is only in sport + or its just the quicker throttle mapping?
did some searching cant really find anything. carl
Sport + gives a very short throttle travel before you are basically at full throttle. Fun, but more difficult to modulate. That can break the tires loose pretty easy.

Not sure about comfort, though. I don't floor the throttle in comfort, personally. Only the top two...
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      06-27-2017, 01:06 PM   #4
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FWIW overboost only activates under WOT and I am not sure if the excessive throttle input in Sport + is considered WOT unless you are actually pushing the pedal to the floor. I want to say no because I've only noticed it once...still in my break in period.
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      06-27-2017, 07:40 PM   #5
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When you floor it (make sure really pedal to metal), all modes are the same.

Also I'm under the impression overboost doesn't work on the gear you downshift to, you'll get that from the next gear.
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      06-27-2017, 11:18 PM   #6
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You can use the SPORTS DISPLAY and it will show if you actually went into overboost as it will show 369lb torque once your floor it.
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      06-27-2017, 11:34 PM   #7
carl44
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Quote:
Originally Posted by D CHOI View Post
You can use the SPORTS DISPLAY and it will show if you actually went into overboost as it will show 369lb torque once your floor it.
Smart never thought of that . Never used it .. Thanks
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      06-28-2017, 04:50 PM   #8
carl44
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tested it in all 3 modes and the max tq &hp all read the same half way between 350&400 in both. who knows about the accuracy of the sport gauges. could be like a country club scale always tells members that they weigh less than they actually do..carl
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      06-28-2017, 05:06 PM   #9
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Quote:
Originally Posted by carl44 View Post
tested it in all 3 modes and the max tq &hp all read the same half way between 350&400 in both. who knows about the accuracy of the sport gauges. could be like a country club scale always tells members that they weigh less than they actually do..carl
Yes I got the same result. Didn't seem to matter if I up shifted or down shifted either. Just mashed the pedal and seemed to report 370 or so on torq, at least for sport and sport+

Didn't try comfort. Sport+ just feels soooo much faster when you hit the kickdown button. Guess it cuts power less because it lets the wheels spin a bit more or comes on faster.
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      06-28-2017, 05:16 PM   #10
carl44
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Quote:
Originally Posted by akkando View Post
Yes I got the same result. Didn't seem to matter if I up shifted or down shifted either. Just mashed the pedal and seemed to report 370 or so on torq, at least for sport and sport+

Didn't try comfort. Sport+ just feels soooo much faster when you hit the kickdown button. Guess it cuts power less because it lets the wheels spin a bit more or comes on faster.
mine is a 6sp did it in 3rd in all 3 modes
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