Quick question concerning stock exhaust

ramorendez · 01-14-2009, 10:16 PM

Hey guys,

Is it normal to have only one side of the exhaust exhaust when starting the car? I'm guessing not... I noticed one morning last week when I was leaving for work that I was blowing smoke out of the passenger-side tailpipe but not the driver's side. This was early in the morning in Los Angeles, and it must've been around 40 deg F out. I've noticed it does the same thing every morning - I start the car, engine hovers around 1.1k rpm before settling to about 7k with one exhaust blowing, then the second exhaust kicks in with a rattle and it finally settles at about 5.5k. It's been doing the same thing every morning since I first noticed last week.

Any ideas? I'm going in for a service appointment tomorrow morning... I have an 08 E93 335i, Nov. 07 build with a little over 10k miles.

Thanks!

themonotron · 01-14-2009, 10:24 PM

Yes its perfectly normal....the exhaust will be coming out of both of the tailpipes when the car is warm.

JBiddy · 01-14-2009, 10:25 PM

bro is normal....lol dont worry about it. happeneds to all 335's

ramorendez · 01-14-2009, 10:35 PM

So I have nothing to worry about? Exhaust from one tailpipe (not both) from a cold start is normal? Sweet deal! Thanks!

Lotus99 · 01-14-2009, 10:37 PM

Hope you're not going in for service for that! LOL!

ramorendez · 01-14-2009, 10:44 PM

Quote:

Originally Posted by Lotus99

Hope you're not going in for service for that! LOL!

Not at all, was just planning on mentioning it

I went on a road trip this weekend and had to make an unexpected stop at a dealership because my ftm kept going off. Long story short, I had a loose valve stem on one of the tires, a nail in each of the rear tires, and a cracked rear rim

I got the tires replaced, but they didn't have any rims in stock, so I'm getting that taken care of tomorrow. That, and the SA mentioned I'd need to service my rear brakes pretty soon. Just thought I'd mention the exhaust, pending the 'post's scrutiny

AlpineG05 · 01-14-2009, 11:48 PM

unplug that wire in your trunk (behind left tail light) and you'll have both exhaust open at all times.

WOPALX · 01-15-2009, 12:06 AM

Quote:

Originally Posted by ramorendez

Hey guys,

before settling to about 7k with one exhaust blowing, then the second exhaust kicks in with a rattle and it finally settles at about 5.5k. It's been doing the same thing every morning since I first noticed last week.

I'd be worried the car is idling too high

ramorendez · 01-15-2009, 12:08 AM

Quote:

Originally Posted by WOPALX

I'd be worried the car is idling too high

Haha, whoops. I meant 700 and 550. I'd be worried if it was idling that high, too!

djflex · 01-15-2009, 02:30 AM

i recognized too and my friend is working for BMW and he showed me how you have always both exhaust. just lay on the floor at the driver side exhaust and remove that cable which is pluged there. after that turn on your car and you'll see both exhausts working

Z22Z · 01-15-2009, 02:32 AM

like alpine said unplug the wire behind the tail light. the growl at start up is way better.

midlife · 01-15-2009, 07:02 AM

Quote:

Originally Posted by Alpine 335i

unplug that wire in your trunk (behind left tail light) and you'll have both exhaust open at all times.

i may try that.
are you sure there is only 1 wire behind the DRIVER´S side tail light?
... i do not want to disconnect something important LOL

thanks

bigaltech · 01-15-2009, 07:11 AM

It's the wire with the metal push attached to it..

scottp999 · 01-15-2009, 07:21 AM

There is a vacuum hose under the car near the end of the exhaust that holds the valve closed until warm up. I would just leave it alone. They engineered the car well, and the ECU knows the engine temp and won't allow much boost until the engine is warmed up. Having half the exhaust closed helps the car warm up faster and allows full boost sooner.

branabolic · 01-15-2009, 11:21 AM

ya this car warms up so fast compared to other cars ive owned. it was -4 F this morning and my car was already blowing heat into the cabin within two minutes. My GMC Sierra with a 6.0 v8 takes like ten mins. too bad i will lose that flap when i put on my exhaust

AlpineG05 · 01-15-2009, 03:05 PM

Quote:

Originally Posted by midlife

i may try that.
are you sure there is only 1 wire behind the DRIVER´S side tail light?
... i do not want to disconnect something important LOL

thanks

no you have the wires that connect to the light itself but other than that it's only that wire that if i remember correctly. it has like a little metal hook or clip on it. i'm sure if you search for the unplug mod you will find a thread that has pictures just in case you don't want to fuck up haha. but it's quick and can be switched back in no time in case something comes up though i don't think it's a problem i had the car serviced and wasn't told anything about it.

enrita · 01-15-2009, 03:42 PM

i run always with the switch out without any issues .

F85_RN · 01-15-2009, 04:04 PM

There's an actuator back driver side, right by the exhaust on 335i. It allows to open both exhaust or one depending on the amount of boost and the temp of the engine. It uses one exhaust at slow speed or low boost to keep the back pressure and opens up at high idle or high boost to release all pressure. Actually this is pretty smart. I've never seen anything like this b4 til i got my brand new 335i.

01-14-2009, 10:16 PM	#1
ramorendez Second Lieutenant 2 Rep 279 Posts Drives: Subie Join Date: Aug 2008 Location: SoCal iTrader: (1)	Quick question concerning stock exhaust Hey guys, Is it normal to have only one side of the exhaust exhaust when starting the car? I'm guessing not... I noticed one morning last week when I was leaving for work that I was blowing smoke out of the passenger-side tailpipe but not the driver's side. This was early in the morning in Los Angeles, and it must've been around 40 deg F out. I've noticed it does the same thing every morning - I start the car, engine hovers around 1.1k rpm before settling to about 7k with one exhaust blowing, then the second exhaust kicks in with a rattle and it finally settles at about 5.5k. It's been doing the same thing every morning since I first noticed last week. Any ideas? I'm going in for a service appointment tomorrow morning... I have an 08 E93 335i, Nov. 07 build with a little over 10k miles. Thanks!
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01-14-2009, 10:24 PM	#2
themonotron Private First Class 2 Rep 163 Posts Drives: 09 E92 M3 AW Join Date: Jan 2007 Location: CA iTrader: (0)	Yes its perfectly normal....the exhaust will be coming out of both of the tailpipes when the car is warm.
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01-14-2009, 10:25 PM	#3
JBiddy Brigadier General 198 Rep 3,840 Posts Drives: F82 ///M Join Date: Apr 2008 Location: Northern/N.J iTrader: (9)	bro is normal....lol dont worry about it. happeneds to all 335's __________________ ///M
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01-14-2009, 10:35 PM	#4
ramorendez Second Lieutenant 2 Rep 279 Posts Drives: Subie Join Date: Aug 2008 Location: SoCal iTrader: (1)	So I have nothing to worry about? Exhaust from one tailpipe (not both) from a cold start is normal? Sweet deal! Thanks!
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01-14-2009, 10:37 PM	#5
Lotus99 Colonel 628 Rep 2,808 Posts Drives: 19 M2C & 18 X3 M40i Join Date: Jul 2007 Location: Canada iTrader: (1)	Hope you're not going in for service for that! LOL!
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01-14-2009, 11:48 PM	#7
AlpineG05 hi 129 Rep 1,140 Posts Drives: Alpine White G05 Join Date: Feb 2008 Location: Bakersfield, Cali iTrader: (1)	unplug that wire in your trunk (behind left tail light) and you'll have both exhaust open at all times. __________________ 2022 M Sport G05 Jb4, CTS catless dp, M performance exhaust, bms intake, IND goodies, Maxton kit
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01-15-2009, 02:30 AM	#10
djflex Private First Class 22 Rep 149 Posts Drives: M4 F82 ordered Join Date: Sep 2008 Location: Zug, Switzerland iTrader: (0)	i recognized too and my friend is working for BMW and he showed me how you have always both exhaust. just lay on the floor at the driver side exhaust and remove that cable which is pluged there. after that turn on your car and you'll see both exhausts working
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01-15-2009, 02:32 AM	#11
Z22Z Lieutenant 33 Rep 536 Posts Drives: WRX Join Date: Dec 2008 Location: Glendale, CA iTrader: (0)	like alpine said unplug the wire behind the tail light. the growl at start up is way better.
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01-15-2009, 07:11 AM	#13
bigaltech Private First Class 9 Rep 142 Posts Drives: 335i Coupe Join Date: Dec 2008 Location: South Florida iTrader: (2)	It's the wire with the metal push attached to it..
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01-15-2009, 07:21 AM	#14
scottp999 Brigadier General 133 Rep 4,764 Posts Drives: 4runner SR5 Join Date: Mar 2007 Location: MD iTrader: (2) Garage List 2007 BMW 335 [9.00]	There is a vacuum hose under the car near the end of the exhaust that holds the valve closed until warm up. I would just leave it alone. They engineered the car well, and the ECU knows the engine temp and won't allow much boost until the engine is warmed up. Having half the exhaust closed helps the car warm up faster and allows full boost sooner.
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01-15-2009, 11:21 AM	#15
branabolic Major 24 Rep 1,037 Posts Drives: e92 335i Join Date: Apr 2008 Location: so. new hampshire iTrader: (5)	ya this car warms up so fast compared to other cars ive owned. it was -4 F this morning and my car was already blowing heat into the cabin within two minutes. My GMC Sierra with a 6.0 v8 takes like ten mins. too bad i will lose that flap when i put on my exhaust __________________ i'm not addicted to boost, but i sure am more fun when i'm on it.
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01-15-2009, 03:42 PM	#17
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	i run always with the switch out without any issues . __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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01-15-2009, 04:04 PM	#18
F85_RN Private First Class 57 Rep 199 Posts Drives: 2015 BMW X5M Join Date: Oct 2008 Location: Seattle, WA iTrader: (0)	There's an actuator back driver side, right by the exhaust on 335i. It allows to open both exhaust or one depending on the amount of boost and the temp of the engine. It uses one exhaust at slow speed or low boost to keep the back pressure and opens up at high idle or high boost to release all pressure. Actually this is pretty smart. I've never seen anything like this b4 til i got my brand new 335i.
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