MPPSK Exhaust Valve Modes?

JRocker3 · 03-04-2019, 09:38 PM

As we know, with the MPPSK for the 340i, there are two exhaust valves that open and close during use.

Can anyone confirm the conditions in which the valves open and close?

Do both open and close together (either passing through or bypassing the muffler entirely)... or do they open separately?

Are they always open in Sport+... do they open under high RPM conditions in Comfort?

I'm curious if anyone has this documented. Thanks!

Beek · 03-04-2019, 11:57 PM

Both valves operate together, either both open or both closed.

It's stated that in comfort valves will open over 4000 rpm, I've never confirmed this because I never run in comfort.

Both valves are always open in Sport or Sport+ with the possible exception of the first minute or so after engine start when both valves will close. If the car is shut off with valves open they will remain open until engine start, when they will close.

Skyhigh · 03-05-2019, 01:30 AM

It has already been said but to sum up:

Comfort: both open above 4000rpm, closed below
Sport / Sport+: Permanently open

It is the exact same control logic that applies to a stock (non-MPPSK) variants, just in this case the valves are two, instead of one.

JRocker3 · 03-05-2019, 07:52 AM

Excellent, thanks for confirmation.

MT4life · 03-05-2019, 04:35 PM

Is there a way to keep them open at all times? Some tee mod like before?

Skyhigh · 03-05-2019, 05:11 PM

Yes - disconnect the valves while open.
But why....!? Whenever you want them open - press the magic button. Never understood why people want to voluntarily loose flexibility.

03-04-2019, 09:38 PM	#1
JRocker3 First Lieutenant 346 Rep 378 Posts Drives: 2018 M3 CS Join Date: Jun 2017 Location: Boston, MA iTrader: (0)	MPPSK Exhaust Valve Modes? As we know, with the MPPSK for the 340i, there are two exhaust valves that open and close during use. Can anyone confirm the conditions in which the valves open and close? Do both open and close together (either passing through or bypassing the muffler entirely)... or do they open separately? Are they always open in Sport+... do they open under high RPM conditions in Comfort? I'm curious if anyone has this documented. Thanks! __________________ /// F80 M3 CS ///
	Appreciate 0 Tweet Quote

03-04-2019, 11:57 PM	#2
Beek Major 707 Rep 1,170 Posts Drives: Most folks crazy. Join Date: Dec 2015 Location: The Twin Cities iTrader: (0)	Both valves operate together, either both open or both closed. It's stated that in comfort valves will open over 4000 rpm, I've never confirmed this because I never run in comfort. Both valves are always open in Sport or Sport+ with the possible exception of the first minute or so after engine start when both valves will close. If the car is shut off with valves open they will remain open until engine start, when they will close. __________________ '16 340xi Mineral Grey/Black Leather, MPSS on 18" 398 Orbit Grey wheels, ZF 8HP50, MPPSK+CF Tips, ZTR, ZMP, ZTP, ZCW, ZDA, ZDB, Black Kidney Grilles. '09 Outback for a beater and grocery getter.
	Appreciate 1 JRocker3346.00 Quote

03-05-2019, 01:30 AM	#3
Skyhigh Brigadier General 1890 Rep 3,876 Posts Drives: BMW F36 Join Date: Apr 2018 Location: Europe iTrader: (0)	It has already been said but to sum up: Comfort: both open above 4000rpm, closed below Sport / Sport+: Permanently open It is the exact same control logic that applies to a stock (non-MPPSK) variants, just in this case the valves are two, instead of one. __________________ "Large increases in cost with questionable increases in performance can be tolerated only in cars and women."
	Appreciate 0 Quote

03-05-2019, 07:52 AM	#4
JRocker3 First Lieutenant 346 Rep 378 Posts Drives: 2018 M3 CS Join Date: Jun 2017 Location: Boston, MA iTrader: (0)	Excellent, thanks for confirmation. __________________ /// F80 M3 CS ///
	Appreciate 1 bmw1boy0.00 Quote

03-05-2019, 04:35 PM	#5
MT4life Lieutenant 576 Rep 584 Posts Drives: 2018 340i: Last MT 3er in US Join Date: Jul 2018 Location: Carolinas iTrader: (0)	Is there a way to keep them open at all times? Some tee mod like before?
	Appreciate 0 Quote

03-05-2019, 05:11 PM	#6
Skyhigh Brigadier General 1890 Rep 3,876 Posts Drives: BMW F36 Join Date: Apr 2018 Location: Europe iTrader: (0)	Yes - disconnect the valves while open. But why....!? Whenever you want them open - press the magic button. Never understood why people want to voluntarily loose flexibility. __________________ "Large increases in cost with questionable increases in performance can be tolerated only in cars and women."
	Appreciate 2 JRocker3346.00 Beek707.00 Quote