07-18-2013, 05:01 PM | #1 |
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1M M Button explaination
There is more going on under the hood when pressing the M button than just adjusting the throttle sensitivity.
This quote was taken from the M-Power web site. Discussion about the M5 V8 engine. http://www.m-power.com/_open/b/varli...d=2723&lang=en "By selecting the Sport or Sport plus accelerator mode, we can really feel the additional boost to the response. How does that work? In Sport or Sport plus mode, a suitable VALVETRONIC controller and the waste gates keep the turbocharger in the higher speed range. Normally, the waste gate used to regulate the charging pressure opens so that the exhaust gas flows out with the minimum possible loss. Pressure is built up again only when I hit the accelerator. For an improved response, I leave the waste gate closed until I need it for regulating. The exhaust gas then always passes over the turbine, which then runs at a considerably higher speed. When even more power is demanded, it is immediately available. However, I have a gradually rising counterpressure that causes a slight rise in consumption. This function can therefore be switched on and off. By the way, in the BMW 1 Series M Coupé the same function is activated at the M Button"
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07-18-2013, 06:21 PM | #3 |
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the difference in the M button is rather subtle at times...
I can definitely feel a difference.. and truthfully, I do not prefer to engage the M button.... in my opinion the throttle response is WAY more sensitive.... and the boost too agressive with it on. I typically leave it off unless I am going to attack a twisty road or on ramp and want a little extra omph. for track driving.. I normally don't use it. For autocrossing I DEFINITELY prefer it off... on small courses, even where it should reduce lag, i find that the boost coming on stronger makes it more difficult to control rear wheel spin. I actually drove at an autocross a week ago... it was a high speed event, with FTD in the 86 second range. course map http://lscbmwcca.boards.net/index.cg...#ixzz2Y0BTo7Sp results http://lscbmwcca.files.wordpress.com/2012/07/event-5-july-132013.pdf course video - NOT my video- NOT me driving.. Video is for illustration only. [u2b]http://www.youtube.com/watch?feature...&v=Di9Y2_kf7Eg[/u2b] For the first time... at this event... I really felt the M button actually helped. See the course map, and note the FOUR long slow speed 180 degree plus corners with a long straight afterwards... The very first severe hairpin turn to the right is depicted on the map as a 180 degree turn. In reality, it was about a 220 to 235 degree turn, taken in second gear, and the time to negotiate it definitely resulted in the car getting OFF the boost..... The final turn, shown as a 270 degree turn was a decreasing radius turn.. 180 degrees entering.. then suddenly sharply decreasing radius for the last 90 degrees and then a blast to to the finish after a quick jog left... With the M button on, the car definitely leapt out of the corner and onto the straight with more ferocity. it also showed in my lap times, which improved in the afternoon when I tried the M button on for the first time in awhile. Last edited by M3 Adjuster; 07-18-2013 at 06:58 PM.. |
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07-18-2013, 06:21 PM | #4 |
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On the 1M it's just a throttle mapping which changes. Doesn't give any more power. You can feel this when going WOT. Playing with the button will make zip difference.
Hold part throttle and press the button and you'll feel a surge, just as if you'd stabbed the accelerator, ie it just gives more throttle for same pedal travel. Sadly it doesn't really do much else and not something I use all that much at all on a daily basis. |
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07-18-2013, 06:23 PM | #5 | |
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the OP is correct. The wastegate is held closed. How do I know? Because a BMW M engineer told me in 2011. IN person, face to face, and yes, I am serious. Also note the phrasing.. " When even more power is demanded, it is immediately available ". This does NOT mean that the car has more power when the M button is on.... it only indicates that the boost is more immediately available so the power comes in SOONER than if the button were not switched on. |
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07-18-2013, 06:50 PM | #6 | |
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Pull a 3rd gear run at WOT to about 4.5K rpm, then hit hit the "M" button whilst still at WOT... You will be all |
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07-18-2013, 06:58 PM | #7 | |
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In mid range operation is significantly changes the available boost available to the engine at any given point. It' pretty easy to feel this. I use the M button 99% of the time.
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07-18-2013, 06:59 PM | #8 | |
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07-18-2013, 07:03 PM | #9 | |
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So in some ways it's like an antilag device. If the wastegate is held closed, then you should be able to build boost while getting ready to launch the car. Should be easy enough to see if you have a boost gauge. |
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07-18-2013, 07:11 PM | #12 | |
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It was pioneered in the 1m since the 1M was the First M car to have a Turbo.
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07-18-2013, 09:23 PM | #13 |
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[QUOTE=M3 Adjuster;14347438]t
I actually drove at an autocross a week ago... it was a high speed event, with FTD in the 86 second range. /QUOTE] Your posted time was great. That list of cars was notable for the lack of E30 M3s and the lone 740i, a rare bird at an autocross. When I did an autocross a couple of months ago at Heartland Park in Topeka, I couldn't believe how much fun the 1M was in that environment. My instructor, a nationally ranked autocrosser, was absolutely impressed with the car, even with its bone stock suspension. We came very close to eclipsing the time of another nationally ranked guy in an E30 M3 with serious autocross chops. What I lacked in finesse was nearly made up for in the jack rabbit acceleration out of the corners. MDM is great for autocrossing and the M button, once you get used to using it, contributes greatly to the fun. |
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07-18-2013, 09:40 PM | #14 | |
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"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
BMW 1M-SOLD-: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake. |
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07-18-2013, 10:13 PM | #15 |
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^ You are right about the X5 and X6, I must admit I don't follow these at all. None the less they were the first M engines with a turbo. However the M button technologies as mentioned here first started with the 1M.
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07-19-2013, 01:46 PM | #16 | ||
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07-19-2013, 01:48 PM | #17 |
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I called on a bunch of tuners to verify that the M button actually does modify wastegate behavior but nobody answered me. It should be pretty evident if you tracked the data on a dyno.
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07-19-2013, 02:45 PM | #18 | |
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Guys, why can't you read this stuff before trying to disprove how it works??
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07-19-2013, 03:06 PM | #19 | |
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My statement still stands, the M button does different things to the different M-cars that have it. The 2nd part of my post only poses the question on how to confirm that the waste-gate indeed does close with the button. How you took that to only be an attempt to disprove what you or the site says is beyond me.
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07-19-2013, 03:24 PM | #20 |
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fizfider:
Question: "I've never heard of this until now. As much as I would love to have a button to close the waste-gates shut, I don't think that's the case. How can we confirm this?" Answer: ""By selecting the Sport or Sport plus accelerator mode, we can really feel the additional boost to the response. How does that work? In Sport or Sport plus mode, a suitable VALVETRONIC controller and the waste gates keep the turbocharger in the higher speed range. Normally, the waste gate used to regulate the charging pressure opens so that the exhaust gas flows out with the minimum possible loss. Pressure is built up again only when I hit the accelerator. For an improved response, I leave the waste gate closed until I need it for regulating. The exhaust gas then always passes over the turbine, which then runs at a considerably higher speed. When even more power is demanded, it is immediately available. However, I have a gradually rising counterpressure that causes a slight rise in consumption. This function can therefore be switched on and off. By the way, in the BMW 1 Series M Coupé the same function is activated at the M Button"
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August 8th ED (#293 of 739 or 740) 88 E30 M3 100% OEM 73K Miles 02 E39 M5 Le Mans Blue 50K Miles 06 E46 M3 ZCP 58K Miles |
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07-19-2013, 03:50 PM | #21 |
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Re-quoting what has already been said does nothing to confirm anything. As i'm sure you know, alot of misinformation has been spread about the 1M since it's inception; everything from availability, model years, colors, options, etc. There is even mention of a V8 engine in our manual. Why do you take such offense to people here trying to confirm what was said on that site?
Let us know if you get a response as i'm very curious.
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07-19-2013, 04:02 PM | #22 | |
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how many times can do you need to be told 1 + 1 = 2 ??? redaair quoted the same thing again and attempted to clarify it even though the sentence is pretty much self explanatory. Well.. At least it is to most of us... Last edited by M3 Adjuster; 07-19-2013 at 04:09 PM.. |
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