Took out secondary cats now having a lot of white smoke..

Jake335i · 06-04-2014, 07:54 PM

Long story short I removed my secondary cats to get a little more sound and since then A LOT of white smoke has been coming out. Do I have an exhaust leak? I also have catless downpipes.. White smoke only comes out when I'm at a stop or going very slow, never at high rpms.. Very embarrassing lol. Any input? Thanks!

Blaster400 · 06-04-2014, 08:02 PM

Common side effect of going complete catless.

Jake335i · 06-04-2014, 08:58 PM

Quote:

Originally Posted by Blaster400

Common side effect of going complete catless.

Ohh ok gotcha. Just making sure it wasn't anything too serious, guess I will be putting my secondary cats in again.

kctim · 06-04-2014, 11:22 PM

Your turbo seals may be failing.

Wedge1967 · 06-05-2014, 08:30 AM

hahahaha... clasic... I did the same last year for Shift S3ctor and the car was smoking so bad I about died from embarrassment. Have new turbos sense then and a new cat back. Funny thing is if I let my car idle for 5 min I get a cloud of white smoke... I plan on keeping the car for a few more years so I'm just going single turbo and be done with the smoking turbo issue. Always wanted a 600 whp pump/meth car and single is the only way to go.

Zombie1 · 06-05-2014, 10:18 AM

Quote:

Originally Posted by Wedge1967

hahahaha... clasic... I did the same last year for Shift S3ctor and the car was smoking so bad I about died from embarrassment. Have new turbos sense then and a new cat back. Funny thing is if I let my car idle for 5 min I get a cloud of white smoke... I plan on keeping the car for a few more years so I'm just going single turbo and be done with the smoking turbo issue. Always wanted a 600 whp pump/meth car and single is the only way to go.

How are guys with single turbos passing emission does the bms DP fix work on that set up as well?

Jake335i · 06-05-2014, 03:24 PM

Quote:

Originally Posted by kctim

Your turbo seals may be failing.

Car has 46k miles, are those expensive to replace?

AlpineSwift · 06-05-2014, 03:54 PM

Quote:

Originally Posted by Jake335i

Car has 46k miles, are those expensive to replace?

What year is yours? You might qualify for the turbo replacement under the BMW extended warranty.

PNWN54 · 06-05-2014, 04:05 PM

Hey Jake, how does it sound without secondary cats too? What exhaust setup do you have?

Jake335i · 06-05-2014, 04:22 PM

Quote:

Originally Posted by AlpineSwift

Quote:

Originally Posted by Jake335i

Car has 46k miles, are those expensive to replace?

What year is yours? You might qualify for the turbo replacement under the BMW extended warranty.

It's an 08 335i 47k miles

Jake335i · 06-05-2014, 04:22 PM

Quote:

Originally Posted by Rock&Roll

Hey Jake, how does it sound without secondary cats too? What exhaust setup do you have?

Sounds great without the cats just don't like the smoke. I have catless downpipes now

11SEC · 06-05-2014, 04:24 PM

Your turbo seals are failing. You have to replace the turbos. The smoke will get worse. I had the same issue and new turbos fixed it.

AlpineSwift · 06-05-2014, 04:45 PM

Quote:

Originally Posted by Jake335i

It's an 08 335i 47k miles

You're covered. Check in with your SA at the dealer to get it done.

DLNKWNT · 06-05-2014, 06:06 PM

im smoking too... having all cats removed doesnt void BMW's extended warranty?

Jake335i · 06-05-2014, 08:02 PM

Quote:

Originally Posted by AlpineSwift

Quote:

Originally Posted by Jake335i

It's an 08 335i 47k miles

You're covered. Check in with your SA at the dealer to get it done.

How's it still under warranty?

glachhman · 06-05-2014, 08:07 PM

I get this being completely catless but randomly and in the winter.

Wedge1967 · 06-07-2014, 11:03 AM

Quote:

Originally Posted by Zombie1

How are guys with single turbos passing emission does the bms DP fix work on that set up as well?

You still have the secondary cats and the mod just regulates the voltage so they stay in parameter. But I'm a firm believer in secondary cats. Spend the money and get a high flow race cats if you don't have them.

Blaster400 · 06-07-2014, 12:53 PM

Quote:

Originally Posted by Wedge1967

But I'm a firm believer in secondary cats. Spend the money and get a high flow race cats if you don't have them.

Listen to Wedge. My car smoked immediately after secondary cats were removed. I added 100 Cell race cats and now no more smoke. Keep in your secondary cats to avoid smoke and smell issues.

Wedge1967 · 06-07-2014, 03:40 PM

Quote:

Originally Posted by Blaster400

Listen to Wedge. My car smoked immediately after secondary cats were removed. I added 100 Cell race cats and now no more smoke. Keep in your secondary cats to avoid smoke and smell issues.

Zombie1 · 06-07-2014, 04:36 PM

Quote:

Originally Posted by Wedge1967

You still have the secondary cats and the mod just regulates the voltage so they stay in parameter. But I'm a firm believer in secondary cats. Spend the money and get a high flow race cats if you don't have them.

In New York you have to pass an OBD test no sniffer in newyork, But i do agree the secondary cats are a must to avoid smell/smoke

2blu4u · 06-10-2014, 08:40 PM

mine did the same after I cut the stock mufflers off although the secondary cats are still in it was about 2 or 3 days before my car was smoking bad! long story short I bought the RBs and hopefully that fixes it.

11SEC · 06-11-2014, 09:56 AM

There is quite a bit of misleading information here.

Removing the secondary cats doesn't cause smoke!!! Bad turbo seals cause smoke!

All you're doing by adding high flow cats is masking the problem at hand.

I as well had smoke issues as soon as I went catless and I immediately replaced my turbos which was over 2 years ago. I haven't had any smoke since.

If you're smoking you have a problem with your turbos, /thread

06-04-2014, 07:54 PM	#1
Jake335i Private First Class 12 Rep 115 Posts Drives: Black e93 335i Join Date: Nov 2013 Location: TX iTrader: (1)	Took out secondary cats now having a lot of white smoke.. Long story short I removed my secondary cats to get a little more sound and since then A LOT of white smoke has been coming out. Do I have an exhaust leak? I also have catless downpipes.. White smoke only comes out when I'm at a stop or going very slow, never at high rpms.. Very embarrassing lol. Any input? Thanks!
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06-04-2014, 08:02 PM	#2
Blaster400 Captain 127 Rep 865 Posts Drives: BMW X3 35i, Porsche Macan S Join Date: Jul 2012 Location: Scottsdale AZ iTrader: (3) Garage List 2018 Porsche Macan S [0.00] 2012 BMW X3 35i [0.00]	Common side effect of going complete catless. __________________ MOTIV 750 ST \| MOTIV PI \| 100% E85 \| Fuel-it Stage 4 LPFP \| MOTIV Boost Box + MHD Protune \| Quaife \| Öhlins \| Brembo \| Akrapovic
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06-04-2014, 11:22 PM	#4
kctim Private First Class 36 Rep 191 Posts Drives: 2017 M3 Join Date: Jan 2013 Location: Kansas City iTrader: (1)	Your turbo seals may be failing.
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06-05-2014, 08:30 AM	#5
Wedge1967 Banned 125 Rep 2,172 Posts Drives: '07 e92 AT Sport Montego Blue Join Date: Sep 2011 Location: Portland, OR iTrader: (3)	hahahaha... clasic... I did the same last year for Shift S3ctor and the car was smoking so bad I about died from embarrassment. Have new turbos sense then and a new cat back. Funny thing is if I let my car idle for 5 min I get a cloud of white smoke... I plan on keeping the car for a few more years so I'm just going single turbo and be done with the smoking turbo issue. Always wanted a 600 whp pump/meth car and single is the only way to go.
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06-05-2014, 04:05 PM	#9
PNWN54 MR. Rocket 46 Rep 398 Posts Drives: 2010 E92 335i M-Sport Join Date: May 2013 Location: Portland, OR iTrader: (2) Garage List 2010 E92 BMW 335i [0.00]	Hey Jake, how does it sound without secondary cats too? What exhaust setup do you have?
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06-05-2014, 04:24 PM	#12
11SEC Banned 5 Rep 254 Posts Drives: E92 335i Join Date: May 2014 Location: Canada iTrader: (0)	Your turbo seals are failing. You have to replace the turbos. The smoke will get worse. I had the same issue and new turbos fixed it.
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06-05-2014, 06:06 PM	#14
DLNKWNT Private First Class 8 Rep 102 Posts Drives: M550 Join Date: Dec 2013 Location: NYC iTrader: (1)	im smoking too... having all cats removed doesnt void BMW's extended warranty?
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06-05-2014, 08:07 PM	#16
glachhman Banned 41 Rep 692 Posts Drives: '07 335i e90 Join Date: Mar 2013 Location: Queens, NY iTrader: (0)	I get this being completely catless but randomly and in the winter.
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06-10-2014, 08:40 PM	#21
2blu4u Private 8 Rep 65 Posts Drives: 07 Montego Blue 335i Join Date: Jan 2012 Location: Columbia SC iTrader: (1)	mine did the same after I cut the stock mufflers off although the secondary cats are still in it was about 2 or 3 days before my car was smoking bad! long story short I bought the RBs and hopefully that fixes it.
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06-11-2014, 09:56 AM	#22
11SEC Banned 5 Rep 254 Posts Drives: E92 335i Join Date: May 2014 Location: Canada iTrader: (0)	There is quite a bit of misleading information here. Removing the secondary cats doesn't cause smoke!!! Bad turbo seals cause smoke! All you're doing by adding high flow cats is masking the problem at hand. I as well had smoke issues as soon as I went catless and I immediately replaced my turbos which was over 2 years ago. I haven't had any smoke since. If you're smoking you have a problem with your turbos, /thread
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