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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > 335i Exhaust with N55 Stage 1 from JB



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      04-13-2011, 11:31 AM   #1
metsownyou
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335i Exhaust with N55 Stage 1 from JB

Hey everyone,

I have a 2011 e90 that I've owned for about 7 months now. I have noticed that the right exhaust is a lot more black around the inside of it than my left exhaust. Is this normal or do you think it is from the tuning?

I can post pics if needed..
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      04-13-2011, 08:39 PM   #2
asdfjkldsa1
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That's normal. I'm not sure if this is the exact reason but there is a valve on the left exhaust that opens and closes the left exhausts at times. If you pull out the cable that connects the power to that valve, the left will remain open 24/7 and you should have even exhaust buildup on each side. This also makes it nicer sounding. There's a guide in the diy section.
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      04-13-2011, 09:23 PM   #3
bluefly
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Yup just like poster above me says, it is because the actuator valve on the driver side muffler remains closed under 3000rpm if part throttle. You can notice this when you do a cold start on the car - the exhaust condensation will clearly be seen (or felt if you put your hand behind the exhaust tip) coming from only the passenger side.

There are various ways to disconnect/block the vacuum line to the actuator valve so that the exhaust flows through both mufflers ALL the time. See the DIY section for some ideas. I used a pin valve in the vacuum line so that when I close the pin valve, the actuator stays open all the time and I have both mufflers working even under 3000rpm. It is a much nicer sound driving around town... throatier and more rumbly but still smooth as is characteristic of the I6. But on long highway trips where you are on and off the throttle there is drone and so the pin valve works great - for such a long trip you loosen the pin valve and in so doing you are back to stock so that the actuator valve opens/closes as programmed. Best of both worlds.
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      04-13-2011, 09:43 PM   #4
idrift4wd
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you could have just said. GOLF TEE MOD. and op will understand everything.
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      04-14-2011, 08:30 AM   #5
IancoleTX
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Quote:
Originally Posted by idrift4wd View Post
you could have just said. GOLF TEE MOD. and op will understand everything.
Well obviously not or he would have known the answer to his question.
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      04-14-2011, 06:24 PM   #6
metsownyou
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So there's no harm in doing this golf tee mod?

Thanks guys!
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      05-03-2011, 12:52 PM   #7
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How is the JB stage 1 running on your N55? I just swapped my 2008 135 for a 2011 135 N55 and want to chip it. Do you recommended it and did you also get the Can Tool?
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