Pushing with SST valves closed

josephx66 · Today, 12:25 PM

Can you push the car on an Autocross course with the valves closed via SST valve controller? Going to a course with 100db limit…

SwankPeRFection · Today, 12:34 PM

I wouldn’t suggest limiting exhaust flow with aggressive engine load/RPM to redline, etc., but that’s just me.

forcefed · Today, 03:59 PM

Quote:

Originally Posted by josephx66

Can you push the car on an Autocross course with the valves closed via SST valve controller? Going to a course with 100db limit…

Why not set it to 50% open? Or back to oem setting so the dme controls it.

SwankPeRFection · Today, 04:06 PM

Perhaps the OP had an aftermarket section swapped in or something, but if it’s stock, this isn’t even a question. Stock exhaust isn’t going to push 100db full on and if it did and they kicked him off the track, that place deserves to have nobody show up for their events. Lol

josephx66 · Today, 06:27 PM

I have a PSI midpipe and it’s fairly loud even with oem valve settings

TopJimmy · Today, 07:16 PM

It actually should be no problem. Our exhausts flow a ton, even 100% through the rear box will do little to the backpressure between head and turbos.

Today, 12:25 PM	#1
josephx66 Private 84 Rep 94 Posts Drives: BMW M3 Competition Join Date: Jun 2023 Location: Los Angeles iTrader: (0)	Pushing with SST valves closed Can you push the car on an Autocross course with the valves closed via SST valve controller? Going to a course with 100db limit…
	Appreciate 0 Tweet Quote

Today, 12:34 PM	#2
SwankPeRFection Major 1387 Rep 1,064 Posts Drives: S4 Join Date: Dec 2023 Location: NA iTrader: (0)	I wouldn’t suggest limiting exhaust flow with aggressive engine load/RPM to redline, etc., but that’s just me.
	Appreciate 0 Quote

Today, 04:06 PM	#4
SwankPeRFection Major 1387 Rep 1,064 Posts Drives: S4 Join Date: Dec 2023 Location: NA iTrader: (0)	Perhaps the OP had an aftermarket section swapped in or something, but if it’s stock, this isn’t even a question. Stock exhaust isn’t going to push 100db full on and if it did and they kicked him off the track, that place deserves to have nobody show up for their events. Lol
	Appreciate 0 Quote

Today, 06:27 PM	#5
josephx66 Private 84 Rep 94 Posts Drives: BMW M3 Competition Join Date: Jun 2023 Location: Los Angeles iTrader: (0)	I have a PSI midpipe and it’s fairly loud even with oem valve settings
	Appreciate 0 Quote

Today, 07:16 PM	#6
TopJimmy Major General 5536 Rep 5,209 Posts Drives: 2023 M3 Comp xDrive Join Date: Jul 2019 Location: Chester County, PA iTrader: (5)	It actually should be no problem. Our exhausts flow a ton, even 100% through the rear box will do little to the backpressure between head and turbos. __________________ '18 F80 Base 6MT \| '19 F82 Exec DCT \| '18 F82 Comp Exec DCT \| '23 G80cx
	Appreciate 1 josephx6684.00 Quote