just did exhaust valve mod

michael3435 · 04-16-2015, 03:12 PM

via disconnecting the connectors under the muffler. car sound 10000x better. everyone should do this its night and day especially on downshifts. I have a couple questions:

does this mess with the warranty at all? I already had to get my muffler replaced because one of the valves was loose.

and does this effect the power delivery of the car?

tom @ eas · 04-16-2015, 04:14 PM

Quote:

Originally Posted by michael3435

via disconnecting the connectors under the muffler. car sound 10000x better. everyone should do this its night and day especially on downshifts. I have a couple questions:

does this mess with the warranty at all? I already had to get my muffler replaced because one of the valves was loose.

and does this effect the power delivery of the car?

You'll be fine, if anything - it might raise a couple of eyebrows at the dealer but there's nothing you did that can't be reversed.

Power is not affected.

GrussGott · 04-16-2015, 05:14 PM

Quote:

Originally Posted by michael3435

via disconnecting the connectors under the muffler. car sound 10000x better. everyone should do this its night and day especially on downshifts. I have a couple questions:

does this mess with the warranty at all? I already had to get my muffler replaced because one of the valves was loose.

and does this effect the power delivery of the car?

Fecking vandals. Pulled those plugs and taped the ends ... Just can't trust anyone anymore I guess.

antych · 04-16-2015, 05:22 PM

Can someone explain how this makes the car sound better compared to driving in Sport+ which also opens the valves?

Woodengun · 04-16-2015, 05:36 PM

Exhaust valves are not open 100% of the time in sport+.

Falafel Combo · 04-16-2015, 06:25 PM

I really want to do this one day. I do. I'm just enjoying the stock exhaust sounds right now, waaaaaaay beyond what I thought was ever possible.

The first mod I had planned was the M performance exhaust. I almost purchased one before Emmy car ever arrived. That's how bad I was expecting the stock f80 exhaust to sound.

All the spy shot leaks and cameo videos we heard prior to the cars unveiling, any iPhone videos you've heard and most of the crap on you tube is just that. Crap! Total and utter crap! The car sounds so much better in real life, it's not even funny! This must be the one understated thing about this car. The one thing I was not expecting to be of any substance, but in reality just totally blew me away!

I will still do the valve mod one day, but for now, I'm enjoying the stock exhaust for what it is. JUST RIGHT!

Falafel Combo · 04-16-2015, 06:26 PM

Quote:

Originally Posted by GrussGott

Fecking vandals. Pulled those plugs and taped the ends ... Just can't trust anyone anymore I guess.

Seriously cracked me up!!!

Jim300186 · 04-16-2015, 06:27 PM

I disconnected them and they both stayed close down!

Onewheeldrive · 04-16-2015, 06:39 PM

Quote:

Originally Posted by Jim300186

I disconnected them and they both stayed close down!

You have to disconnect when the motor is warm and sport plus is on so they're open. Look into the exhaust to make sure they're open before disconnecting.

DarksideM4 · 04-16-2015, 06:56 PM

Or just pick this thing up, worth the money imo with the additional firmware features being added in by BMS. I've had this for a month now, so convenient to go slient or loud when I want to.

http://www.n54tuning.com/index.php?_...&productId=190

Wah · 04-16-2015, 07:02 PM

Quote:

Originally Posted by Jim300186

I disconnected them and they both stayed close down!

Put it on sport+ and drive around for a few minutes. Shut the car off while still in sport+ mode. Then look in your exhaust pipes to make sure the valves are open. Then disconnect the plugs.

Buddy Revell · 04-16-2015, 07:28 PM

The valve mod is awesome. Call me a jerk, but I love the loud, aggressive cold start sound. The leaf blower/lawn mower sound it used to have with closed valves is the absolute WORST thing about this car. Glad it's gone forever!!

AW BMW · 04-16-2015, 07:36 PM

Quote:

Originally Posted by Buddy Revell

The valve mod is awesome. Call me a jerk, but I love the loud, aggressive cold start sound. The leaf blower/lawn mower sound it used to have with closed valves is the absolute WORST thing about this car. Glad it's gone forever!!

Agree with you on everything, this mod is awesome. But I'm starting to get use to it and am thinking of an exhaust possibly or just downpipes. But if I don't do it no biggie, it's way better then valves closed.

antych · 04-17-2015, 04:07 AM

Anyone knows when the valves close and open in Sport+?

I'm tempted to do the mod, but there are instances when I wouldn't want it to be any louder. I suspect my neighbours already hate me because of the cold start. If I ever have to get up very early for a flight or something, I will wake up half of the residents. I can't imagine driving for hours on a motorway with loud exhaust is fun either.

If the valves only stay close when the engine is warming up and stay open when I drive aggressively in S mode, then this mod seems completely pointless and just makes the car less useful.

Gstone · 04-17-2015, 07:33 AM

I also just did it yesterday. Much better. Not too loud. Normal driving is not too loud. I see little reason to be able to control open vs closed(maybe just for cold start).
Still don't fully understand when the valves normally open in sport +, if it's only under load then why are they open when you turn off the car to do the valve unplug?

Bahn360Photo · 04-17-2015, 08:39 AM

Quote:

Originally Posted by antych

Can someone explain how this makes the car sound better compared to driving in Sport+ which also opens the valves?

same as sport+

bigdog1250 · 04-17-2015, 11:46 AM

Sport+ for me always keeps the valves open

The only difference is that the car starts with the valves closed but you can quickly open them buy hitting M1 (just need to give a little gas after and they open up).

Money2536 · 04-17-2015, 01:41 PM

It takes about 5 minutes to disconnect the valves. Why not just give it a try to see if you like it?

IMrMark · 04-17-2015, 01:46 PM

love this mod, honestly.

BK9731 · 04-17-2015, 05:26 PM

I was told by a BMW tech that the valve does more than just control the sound and is related to the performance as well (?back pressure). I re-plugged mine after awhile as the noise got old and my wife hated it. On cold start ups she would say "what's wrong with your car?"

michael3435 · 04-17-2015, 08:07 PM

interesting read here

http://f80.bimmerpost.com/forums/sho...d.php?t=979417

I feel like the power delivery is a little different at very low rpm's but that may be just me...I just want to make sure I'm not messing anything up with the car by always keeping the valves open.

also interesting that a poster above said a tech told them the valve control somehow affects the power

marrk · 04-17-2015, 11:50 PM

Just did mine. Start up is epic, lol! But then she quiets down. Sounds much better with values open all the time!

04-16-2015, 03:12 PM	#1
michael3435 Private 27 Rep 82 Posts Drives: Black M3 Join Date: Jan 2015 Location: Connecticut iTrader: (0)	just did exhaust valve mod via disconnecting the connectors under the muffler. car sound 10000x better. everyone should do this its night and day especially on downshifts. I have a couple questions: does this mess with the warranty at all? I already had to get my muffler replaced because one of the valves was loose. and does this effect the power delivery of the car?
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04-16-2015, 05:22 PM	#4
antych Lieutenant 246 Rep 435 Posts Drives: 2017 BMW M4CP SO Join Date: Feb 2015 Location: London iTrader: (0) Garage List 2014 BMW M4 [10.00]	Can someone explain how this makes the car sound better compared to driving in Sport+ which also opens the valves?
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04-16-2015, 05:36 PM	#5
Woodengun Lieutenant 310 Rep 408 Posts Drives: Yugo Join Date: Apr 2015 Location: Norcal iTrader: (0)	Exhaust valves are not open 100% of the time in sport+.
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04-16-2015, 06:25 PM	#6
Falafel Combo Banned 3773 Rep 6,673 Posts Drives: X5 xDrive50i Join Date: May 2011 Location: New England iTrader: (3)	I really want to do this one day. I do. I'm just enjoying the stock exhaust sounds right now, waaaaaaay beyond what I thought was ever possible. The first mod I had planned was the M performance exhaust. I almost purchased one before Emmy car ever arrived. That's how bad I was expecting the stock f80 exhaust to sound. All the spy shot leaks and cameo videos we heard prior to the cars unveiling, any iPhone videos you've heard and most of the crap on you tube is just that. Crap! Total and utter crap! The car sounds so much better in real life, it's not even funny! This must be the one understated thing about this car. The one thing I was not expecting to be of any substance, but in reality just totally blew me away! I will still do the valve mod one day, but for now, I'm enjoying the stock exhaust for what it is. JUST RIGHT!
	Appreciate 1 Quote

04-16-2015, 06:27 PM	#8
Jim300186 Private First Class 39 Rep 173 Posts Drives: Bmw m4 Join Date: Aug 2014 Location: Scotland iTrader: (0)	I disconnected them and they both stayed close down!
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04-16-2015, 06:56 PM	#10
DarksideM4 Second Lieutenant 208 Rep 246 Posts Drives: 2015 BSM M4 Join Date: Nov 2014 Location: Allen, TX iTrader: (1) Garage List 2015 BMW M4 [10.00]	Or just pick this thing up, worth the money imo with the additional firmware features being added in by BMS. I've had this for a month now, so convenient to go slient or loud when I want to. http://www.n54tuning.com/index.php?_...&productId=190
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04-16-2015, 07:28 PM	#12
Buddy Revell First Lieutenant 48 Rep 351 Posts Drives: E92 M3, M4, 991 911 Turbo Join Date: Jan 2014 Location: Orange County, CA iTrader: (0)	The valve mod is awesome. Call me a jerk, but I love the loud, aggressive cold start sound. The leaf blower/lawn mower sound it used to have with closed valves is the absolute WORST thing about this car. Glad it's gone forever!!
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04-17-2015, 04:07 AM	#14
antych Lieutenant 246 Rep 435 Posts Drives: 2017 BMW M4CP SO Join Date: Feb 2015 Location: London iTrader: (0) Garage List 2014 BMW M4 [10.00]	Anyone knows when the valves close and open in Sport+? I'm tempted to do the mod, but there are instances when I wouldn't want it to be any louder. I suspect my neighbours already hate me because of the cold start. If I ever have to get up very early for a flight or something, I will wake up half of the residents. I can't imagine driving for hours on a motorway with loud exhaust is fun either. If the valves only stay close when the engine is warming up and stay open when I drive aggressively in S mode, then this mod seems completely pointless and just makes the car less useful.
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04-17-2015, 07:33 AM	#15
Gstone Lieutenant 142 Rep 555 Posts Drives: '18 GT350, '15 M4 sold Join Date: Sep 2014 Location: NY Burbs iTrader: (0)	I also just did it yesterday. Much better. Not too loud. Normal driving is not too loud. I see little reason to be able to control open vs closed(maybe just for cold start). Still don't fully understand when the valves normally open in sport +, if it's only under load then why are they open when you turn off the car to do the valve unplug?
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04-17-2015, 11:46 AM	#17
bigdog1250 Private First Class 51 Rep 117 Posts Drives: Sakhir M4 Join Date: Nov 2014 Location: San Francisco iTrader: (0)	Sport+ for me always keeps the valves open The only difference is that the car starts with the valves closed but you can quickly open them buy hitting M1 (just need to give a little gas after and they open up).
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04-17-2015, 01:41 PM	#18
Money2536 Colonel 1586 Rep 2,148 Posts Drives: '13 E92 M3 \| 992 GT3 Touring Join Date: Feb 2010 Location: The Villages, FL iTrader: (1)	It takes about 5 minutes to disconnect the valves. Why not just give it a try to see if you like it?
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04-17-2015, 01:46 PM	#19
IMrMark Captain 75 Rep 991 Posts Drives: 2015 BMW M4 Join Date: Apr 2014 Location: Fairfax, VA iTrader: (0) Garage List 2015 BMW M4 [9.66]	love this mod, honestly. __________________ 2015 ///M4 F82 [ Mineral Grey \| SO Ext \| 19" Black \| 6MT \| CFRP Interior \| LED \| Executive \| Side/Top Cameras \| Adaptive M Suspension \| HK Surround ] :: will code locally for rum, beer, or chicken; PM as desired :: Instagram: IMrMark
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04-17-2015, 05:26 PM	#20
BK9731 Enlisted Member 27 Rep 45 Posts Drives: F80 M3 Join Date: Aug 2014 Location: NJ iTrader: (0)	I was told by a BMW tech that the valve does more than just control the sound and is related to the performance as well (?back pressure). I re-plugged mine after awhile as the noise got old and my wife hated it. On cold start ups she would say "what's wrong with your car?"
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04-17-2015, 08:07 PM	#21
michael3435 Private 27 Rep 82 Posts Drives: Black M3 Join Date: Jan 2015 Location: Connecticut iTrader: (0)	interesting read here http://f80.bimmerpost.com/forums/sho...d.php?t=979417 I feel like the power delivery is a little different at very low rpm's but that may be just me...I just want to make sure I'm not messing anything up with the car by always keeping the valves open. also interesting that a poster above said a tech told them the valve control somehow affects the power
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04-17-2015, 11:50 PM	#22
marrk Second Lieutenant 207 Rep 208 Posts Drives: pinto Join Date: Oct 2014 Location: nyc iTrader: (0)	Just did mine. Start up is epic, lol! But then she quiets down. Sounds much better with values open all the time!
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