OVERBOOST

zayzay · 09-09-2011, 04:15 PM

how do you get the 1M to the 369ft lb of torque from the standard 332ft lb of torque?

Texas F1 · 09-09-2011, 04:19 PM

According to the manual, just press the accelerator to the floor and hold on.

robertm · 09-09-2011, 04:34 PM

Quote:

Originally Posted by Texas F1

According to the manual, just press the accelerator to the floor and hold on.

I don't believe you.

I am going to have to try it out myself, repeatedly

nachob · 09-09-2011, 05:21 PM

Quote:

Originally Posted by zayzay

how do you get the 1M to the 369ft lb of torque from the standard 332ft lb of torque?

I heard it described at BMW press conference as coming on at HIGH LOAD full LOW RPM. So if you are putting around at low RPM and mash the trottle you will be the burst for a bit. I will then taper off at higher RPMs. That is my understanding of it.

M3 Adjuster · 09-09-2011, 05:51 PM

yes. Full throttle.. wait 5 seconds.. hold on.

rapter · 09-09-2011, 09:58 PM

I was told that to get the full amount, you don't only have to utilize Wide-open-throttle, the m-button has to be pressed.

Please clarify.

Dan Parker · 09-09-2011, 10:32 PM

The M button does not need to be pressed. The main reason for over boost is to give the car extra low end acceleration. At 60 mph in 6th gear with wide open throttle the car accelerates faster and is more effortless. Overboost lasts for 5-7 seconds and gradually settles back to the normal torque without being able to feel it.

nachob · 09-09-2011, 10:33 PM

Quote:

Originally Posted by rapter

I was told that to get the full amount, you don't only have to utilize Wide-open-throttle, the m-button has to be pressed.

Please clarify.

The M button only remaps (makes the throttle more sensitive per unit of travel) so you get to full throttle faster..?

I didn't hear that you had to have M button. No one has ever mentioned that before. As a matter of fact most of the reviewers have lamented that the M button on the 1M ONLY changes the sensitivity instead of doing something else like the M3. I also didn't feel any more power from the M button just more "lively" and sensitive to throttle application.

This is a good question though and you have me second guessing myself.

ZCP M3 · 09-11-2011, 02:43 AM

They should have just put an SMG style detent in the gas pedal. Push beyond WOT, activate overboost.

1M Fan · 09-11-2011, 05:54 PM

Quote:

Originally Posted by M3 Adjuster

yes. Full throttle.. wait 5 seconds.. hold on.

Sounds like a grenade. Seriously, you really feel it when it kicks in.

Quote:

Originally Posted by nachob

The M button only remaps (makes the throttle more sensitive per unit of travel) so you get to full throttle faster..?

If you are just cruising along and press the M button without adjusting the throttle peddle, the car will speed up as the throttle peddle is remapped. It seems useless to me. I've read the M button also adjust the stability control which seems to be true.

bdaddylo · 09-12-2011, 12:19 AM

Quote:

I've read the M button also adjust the stability control which seems to be true.

Sorry, not on the 1M.

clived · 09-12-2011, 02:31 AM

Quote:

Originally Posted by 1M Fan

I've read the M button also adjust the stability control which seems to be true.

In what way does it seem to be true? What change in stability control behaviour have you observed when pressing the M button?

MrRoboto · 09-12-2011, 05:58 AM

MDM should have been linked to the M button.

MusclezMarinara · 09-12-2011, 07:36 AM

Quote:

Originally Posted by MrRoboto

MDM should have been linked to the M button.

DarthColin · 09-20-2011, 10:37 PM

Found this on the M-Power website
Interview with Jürgen Poggel, Head of Engine Development, BMW M GmbH.

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.

dominoM · 09-20-2011, 11:03 PM

^^ Nice find. That explains the quicker engine response from the M button, and how it is not just throttle mapping but also requires mechanical changes, which makes sense for a turbocharged motor.

Agree with others that from everything I have read there is no connection between M button response and temporary torque increase from overboost.

v1k0d3n · 09-20-2011, 11:16 PM

This is exactly the info I was looking for a couple of weeks ago! Thank you. Again...great find Darth.

DarthColin · 09-20-2011, 11:55 PM

The sensation is exactly as described; as if the turbos are online quicker.

hutch2196 · 09-21-2011, 12:32 AM

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.

Can we assume from this that by keeping your M button depressed ie On, full time you can expected higher fuel consumption? With just a responsive throttle being the effect when on it ought to make no difference to fuel economy if you just potter around, having read the above I'm not so sure. I'm not saying that I potter by the way!! Just intrested to know.

sparoz · 09-21-2011, 01:15 AM

Just to add the over boost doesn't happen until the car is up to temperature.

ZCP M3 · 09-21-2011, 10:54 PM

That's awesome, BMW are using the wastegate to keep the turbo spooled up rather than venting gas around the turbine as soon as possible! I wonder if you can feel the extra engine braking force or not.

Now, who's going to be the first to install one of these gauges on a 1M and 135i so we can see the difference?

http://www.turbobygarrett.com/turbob...ed_sensor.html

KIYO · 09-22-2011, 07:51 AM

I am also confused how to activate the Over boost function.
As watching the intake manifold pressure via CAN bus, I could not observe over 120 kPa (1.2 bar).

Someone said that the data in the CAN bus is not precise so I am planning to install a Defi boost pressure gauge.

I am now waiting for a convoluted tube to arrive.

09-09-2011, 04:15 PM	#1
zayzay First Lieutenant 76 Rep 370 Posts Drives: bmw 1M Join Date: Aug 2011 Location: Florida iTrader: (0)	OVERBOOST how do you get the 1M to the 369ft lb of torque from the standard 332ft lb of torque?
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09-09-2011, 04:19 PM	#2
Texas F1 1M Owner 36 Rep 239 Posts Drives: Lotus Evora 410, BMW 1M, Z4 Join Date: Jul 2011 Location: Leander, TX iTrader: (1)	According to the manual, just press the accelerator to the floor and hold on.
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09-09-2011, 05:51 PM	#5
M3 Adjuster Banned 7906 Rep 11,785 Posts Drives: 1M, X1 M Sport, E46 325ic Join Date: Mar 2008 Location: Dallas, Tx iTrader: (0)	yes. Full throttle.. wait 5 seconds.. hold on.
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09-09-2011, 09:58 PM	#6
rapter Lieutenant 71 Rep 485 Posts Drives: 1(M)other f*^#er of a car Join Date: Nov 2010 Location: Canada iTrader: (0)	I was told that to get the full amount, you don't only have to utilize Wide-open-throttle, the m-button has to be pressed. Please clarify.
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09-09-2011, 10:32 PM	#7
Dan Parker Major 79 Rep 1,421 Posts Drives: 2012 Golf R Join Date: Nov 2010 Location: Georgia iTrader: (0)	The M button does not need to be pressed. The main reason for over boost is to give the car extra low end acceleration. At 60 mph in 6th gear with wide open throttle the car accelerates faster and is more effortless. Overboost lasts for 5-7 seconds and gradually settles back to the normal torque without being able to feel it. __________________ Dan Parker
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09-11-2011, 02:43 AM	#9
ZCP M3 First Lieutenant 19 Rep 388 Posts Drives: 2011 VO 1M Coupe #759 Join Date: Jul 2011 Location: St. Louis, MO iTrader: (0)	They should have just put an SMG style detent in the gas pedal. Push beyond WOT, activate overboost.
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09-12-2011, 05:58 AM	#13
MrRoboto Brigadier General 1846 Rep 4,836 Posts Drives: VO 1M Join Date: Aug 2007 Location: Canada iTrader: (0)	MDM should have been linked to the M button.
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09-20-2011, 10:37 PM	#15
DarthColin First Lieutenant 44 Rep 324 Posts Drives: 2011 1 Series M Coupe Join Date: May 2009 Location: Grenfell, SK iTrader: (0)	Found this on the M-Power website Interview with Jürgen Poggel, Head of Engine Development, BMW M GmbH. 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. __________________ ‘If it even looks like rain and you pretend to be Michael Schumacher in a 599 GTO, you’ll end up in a tree’ -Clarkson
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09-20-2011, 11:03 PM	#16
dominoM Private Low Class 300 Rep 279 Posts Drives: G87 M2 ZB 6MT Join Date: Feb 2011 Location: Colorado iTrader: (0)	^^ Nice find. That explains the quicker engine response from the M button, and how it is not just throttle mapping but also requires mechanical changes, which makes sense for a turbocharged motor. Agree with others that from everything I have read there is no connection between M button response and temporary torque increase from overboost.
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09-20-2011, 11:16 PM	#17
v1k0d3n Captain 92 Rep 965 Posts Drives: M2C /// (and x3 for the wife) Join Date: Jul 2011 Location: Charlotte, NC iTrader: (0)	This is exactly the info I was looking for a couple of weeks ago! Thank you. Again...great find Darth.
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09-20-2011, 11:55 PM	#18
DarthColin First Lieutenant 44 Rep 324 Posts Drives: 2011 1 Series M Coupe Join Date: May 2009 Location: Grenfell, SK iTrader: (0)	The sensation is exactly as described; as if the turbos are online quicker. __________________ ‘If it even looks like rain and you pretend to be Michael Schumacher in a 599 GTO, you’ll end up in a tree’ -Clarkson
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09-21-2011, 12:32 AM	#19
hutch2196 Enlisted Member 1 Rep 36 Posts Drives: 1M Coupe & Sunbeam Lotus Join Date: Aug 2011 Location: Wiltshire iTrader: (0)	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. Can we assume from this that by keeping your M button depressed ie On, full time you can expected higher fuel consumption? With just a responsive throttle being the effect when on it ought to make no difference to fuel economy if you just potter around, having read the above I'm not so sure. I'm not saying that I potter by the way!! Just intrested to know. Last edited by hutch2196; 09-21-2011 at 05:11 PM..
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09-21-2011, 01:15 AM	#20
sparoz Brigadier General 191 Rep 4,848 Posts Drives: VO 1///M; Macan Turbo Join Date: Jun 2008 Location: Sunshine Coast iTrader: (0)	Just to add the over boost doesn't happen until the car is up to temperature. __________________ Macan S Diesel - Carrera White Macan Turbo - White 1///M - Valencia Orange
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09-21-2011, 10:54 PM	#21
ZCP M3 First Lieutenant 19 Rep 388 Posts Drives: 2011 VO 1M Coupe #759 Join Date: Jul 2011 Location: St. Louis, MO iTrader: (0)	That's awesome, BMW are using the wastegate to keep the turbo spooled up rather than venting gas around the turbine as soon as possible! I wonder if you can feel the extra engine braking force or not. Now, who's going to be the first to install one of these gauges on a 1M and 135i so we can see the difference? http://www.turbobygarrett.com/turbob...ed_sensor.html
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09-22-2011, 07:51 AM	#22
KIYO Private First Class 23 Rep 143 Posts Drives: 1er M Coupé Join Date: Mar 2011 Location: Vienna Austria -> Tokyo, JAPAN iTrader: (0)	I am also confused how to activate the Over boost function. As watching the intake manifold pressure via CAN bus, I could not observe over 120 kPa (1.2 bar). Someone said that the data in the CAN bus is not precise so I am planning to install a Defi boost pressure gauge. I am now waiting for a convoluted tube to arrive.
	Appreciate 0 Quote