Pedal response

sochermit · 12-03-2012, 07:32 AM

When I press the pedal down, about 3/4 of the way to the floor, I get a boost in power for passing. When I press it all the way to the floor I get an added boost. Is this where the Turbo kicks in?

xShadows · 12-03-2012, 08:04 AM

No, that's called giving it more gas. >.> Turbo's kick in at full boost around 1500-2000 RPMs.

kyle135i · 12-03-2012, 10:04 AM

I think I know what you are talking about. Is it that final 'click' when the pedal goes down?

Freon · 12-03-2012, 10:13 AM

There is no particular moment when the turbos "kick in". They are always rotating as long as the engine is running and producing a slight positive pressure between the turbo and throttle body (or the back of the intake valves for a valvetronic engine).

froop · 12-03-2012, 03:55 PM

What that final 'click' does is allow for maximum acceleration at any given time.

In an automated gear box, either steptronic or DCT, it will kick down to the gear to the lowest possible for that given speed to give you maximum acceleration. This will happen even if you are in manual mode.

Normally if you're in an automated mode, D or DS, it will drop down gears to accelerate faster as your press the pedal down further but it keeps things civilised. If you're in manual, it won't drop down unless you manually do it or unless you hit the 'click'.

sochermit · 12-04-2012, 06:39 AM

Thanks all for your input. I think I understand it a little more than before. Have a great day.

B-Dawg · 12-04-2012, 07:58 AM

Quote:

Originally Posted by xShadows

No, that's called giving it more gas.

Thanks for making me laugh.

AJundEinser · 12-04-2012, 12:05 PM

Quote:

Originally Posted by sochermit

When I press the pedal down, about 3/4 of the way to the floor, I get a boost in power for passing. When I press it all the way to the floor I get an added boost. Is this where the Turbo kicks in?

Keep in mind the compressed air concept of your N55 motor: As you increase your RPMs (thus increasing exhaust flow) you will be using cintrifugul force to compress the air that's preparing to enter your motor for combustion. You will build boost as you open the throttle.

135 FOR THE WIN. High torque for down low and a smoothe and nasty finish at full boost n beyond. Beast mode.

b1aze · 12-04-2012, 12:58 PM

Also remember that there are different boost targets based on throttle position and RPM, unless the fueling control loop is very different than the last turbo car i owned. Based on throttle position and current RPM, there were fueling and boost tables that were the targets for that specific spot.

12-03-2012, 07:32 AM	#1
sochermit Lieutenant 61 Rep 574 Posts Drives: 2003 325i, 2012 135i Join Date: Mar 2012 Location: Canyon Lake, TX iTrader: (0)	Pedal response When I press the pedal down, about 3/4 of the way to the floor, I get a boost in power for passing. When I press it all the way to the floor I get an added boost. Is this where the Turbo kicks in?
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12-03-2012, 08:04 AM	#2
xShadows Lieutenant 134 Rep 455 Posts Drives: 2022 BMW M4 Comp xDrive Join Date: Aug 2012 Location: Sanford, NC iTrader: (2)	No, that's called giving it more gas. >.> Turbo's kick in at full boost around 1500-2000 RPMs.
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12-03-2012, 10:04 AM	#3
kyle135i New Member 0 Rep 11 Posts Drives: Bmw 135i Join Date: Sep 2012 Location: B.C. Canada iTrader: (0) Garage List 2008 BMW 135i [0.00]	I think I know what you are talking about. Is it that final 'click' when the pedal goes down?
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12-03-2012, 10:13 AM	#4
Freon Major 81 Rep 1,051 Posts Drives: 2009 135i Join Date: Nov 2007 Location: Indianapolis iTrader: (3)	There is no particular moment when the turbos "kick in". They are always rotating as long as the engine is running and producing a slight positive pressure between the turbo and throttle body (or the back of the intake valves for a valvetronic engine). __________________ 2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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12-03-2012, 03:55 PM	#5
froop Colonel 171 Rep 2,682 Posts Drives: 08 AW 6MT E82 Join Date: Jul 2012 Location: Sydney, Australia iTrader: (3)	What that final 'click' does is allow for maximum acceleration at any given time. In an automated gear box, either steptronic or DCT, it will kick down to the gear to the lowest possible for that given speed to give you maximum acceleration. This will happen even if you are in manual mode. Normally if you're in an automated mode, D or DS, it will drop down gears to accelerate faster as your press the pedal down further but it keeps things civilised. If you're in manual, it won't drop down unless you manually do it or unless you hit the 'click'. __________________ froop's AW 135i Build Thread
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12-04-2012, 06:39 AM	#6
sochermit Lieutenant 61 Rep 574 Posts Drives: 2003 325i, 2012 135i Join Date: Mar 2012 Location: Canyon Lake, TX iTrader: (0)	Thanks all for your input. I think I understand it a little more than before. Have a great day.
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12-04-2012, 12:58 PM	#9
b1aze Just one more taste... 566 Rep 2,011 Posts Drives: 2013 128i 6MT MSport Join Date: Aug 2012 Location: Uxbridge MA iTrader: (18)	Also remember that there are different boost targets based on throttle position and RPM, unless the fueling control loop is very different than the last turbo car i owned. Based on throttle position and current RPM, there were fueling and boost tables that were the targets for that specific spot. __________________ My Build Thread: Jet Black 6MT 128i with MSport
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