What Exactly Happens to the Engine When the M Button is Depressed? - Bimmerfest - BMW Forums



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Old 05-02-2007, 10:26 PM
Malibubimmer Malibubimmer is offline
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What Exactly Happens to the Engine When the M Button is Depressed?

I know what the result is - another 100+ HP. But what exactly happens, both electronically and mechanically to the engine when the M button is pressed. (I assume P500 and P500- sport merely reflect additional electronics coming into play to make shifting, etc., faster.)

Although I have an M6, I post here because you guys are M Geeks whereas the few people posting next door should really be driving L6s. (Whoops, did I say that?)
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Old 05-02-2007, 10:47 PM
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itzeug itzeug is offline
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it wakes up 100 extra horses from their usual nap

and gives them crack
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Old 05-03-2007, 01:09 PM
PPG4 PPG4 is offline
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There's another set of fuel maps that kick in when P500 and P500 Sport are selected. Also, the throttle bodies are allowed to open more than the 90% they're restricted to in P400.
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Old 05-03-2007, 03:36 PM
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650iOzBoy 650iOzBoy is offline
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Quote:
Originally Posted by Malibubimmer View Post
I know what the result is - another 100+ HP. But what exactly happens, both electronically and mechanically to the engine when the M button is pressed. (I assume P500 and P500- sport merely reflect additional electronics coming into play to make shifting, etc., faster.)

Although I have an M6, I post here because you guys are M Geeks whereas the few people posting next door should really be driving L6s. (Whoops, did I say that?)
Well, it doesn't look like the "M Geeks" as you call them, have provided you with much substantial answers. I think "the few people posting next door" who fantasizes about driving a V-12 bi-turbo steptronic Individual 675i will do much better than here. Who need the ///M6 when we already have the V-12 bi-turbo steptronic Individual 675i?
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Old 05-03-2007, 11:11 PM
Malibubimmer Malibubimmer is offline
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Originally Posted by itzeug View Post
it wakes up 100 extra horses from their usual nap

and gives them crack
This is the kind of smart-ass answer that I would expect only from someone like myself. And it's ambiguous. Do all the horses get crack, or just the recently awakened 100?
Quote:
Originally Posted by PPG4 View Post
There's another set of fuel maps that kick in when P500 and P500 Sport are selected. Also, the throttle bodies are allowed to open more than the 90% they're restricted to in P400.
Thanks. Can you go into more detail?
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Old 05-06-2007, 02:27 PM
JamesInLV JamesInLV is offline
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In the engine there are throttle butterflies that are limited (I think the limit is actually 85***37 in P400. When you press the Power button to go into P500, they are allowed to open to 100% of their limit. If you look at a dyno chart of the engine, you'll notice that in P500 it hits 400 horsepower at about 6200-6500rpm. When you are driving in P400 and you floor it from a low rpm, you'll feel the power building and building all the way up to about 6500rpm, and then there is just a let down similar to the big american engines that are super strong to about 75% of their rpm and it's better to shift there than at redline. The M5 engine simply isn't given the ability to generate any more power because the butterflied can't open 100%. When you are in P500, the power continuously builds all the way to redline with no letdown...you just keep getting pushed back in your seat more and more until you need to shift.

As far as P500 and P500S (sport) goes, they are simply different throttle mappings. P500 is more of a linear map (straight line), and P500S is more convex, applying more throttle at the beginning of the accelerator and. Many find P500S to be jerky from a standing start and difficult to use driving around town. I have to agree.
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Old 05-06-2007, 02:47 PM
Malibubimmer Malibubimmer is offline
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I did an A-B test with the M6 coupe during the DE, with the M power button on and off. There was an awful lot more straight line acceleration. That was the only difference, though. We weren't allowed to turn DSC off or even go into dynamic mode. Now that I can, I have to be careful where I do it. I've chirped the tyres a few times on the freeways at about 50 MPH +.
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Old 05-08-2007, 06:49 AM
lapeter lapeter is offline
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I just picked up my 2006 M5 and I am still learning all about it. You can decide or program what happens when you push the M button on the steering wheel. You can choose 400, 500 or 500s and you choose the transmission shifting, throttle response and suspension.
Al
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Old 05-08-2007, 07:04 PM
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Well obviously you'd want to set it to the most aggressive setting of everything.........

I can imagine one of the many retired, old folks who buy these machines setting M mode (if they can deal with the computer stuff). "I want the softest suspension, A1 shift mode, 400 horses, and full DSC".
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Old 05-16-2007, 04:45 PM
PPG4 PPG4 is offline
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Quote:
Originally Posted by AzNMpower32 View Post
Well obviously you'd want to set it to the most aggressive setting of everything.........
Not really. Using P500S and EDC Sport settings driving around town, particularly over rough roads, is quite a PITA. The throttle is extreeeemly sensitive, so as the chassis moves and your foot moves a little, the car tends to jerk around a bit.

Personally, I always let the beast warm up to normal operating temperature before I switch out of P400 or move the SMG program above S4. Sometimes I'll wait to kick it on until I'm accelrating up a freeway on-ramp... start in 2nd gear at 2000 rpm, stand on the throttle, at 4500 rpm hit the M button for P500S, S5, etc. and take off like a rocket. Feeling the change kick in is pretty fun.
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