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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Catless downpipes but keep orignal secondary cats



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      12-09-2012, 03:11 PM   #1
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Catless downpipes but keep orignal secondary cats

Hey guys just wondering if anyone one is running catless downpipes but still have there secondary cats in place? would I be able to pass an emissions test with a setup like this ? also would the secondaries be sufficient to eliminate any smell? Ive looked this up already online cant find any sufficient information on this topic ...
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      12-09-2012, 04:45 PM   #2
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That's what I'm running. Still needed the DPFix to pass inspection in NJ because they plug into the OBDII but no smells and/or smoke.
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      12-09-2012, 05:11 PM   #3
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Quote:
Originally Posted by N54King View Post
Hey guys just wondering if anyone one is running catless downpipes but still have there secondary cats in place? would I be able to pass an emissions test with a setup like this ? also would the secondaries be sufficient to eliminate any smell? Ive looked this up already online cant find any sufficient information on this topic ...
I will have this setup in 2 weeks time. No need to worry about emissions... you can * pay * to pass if you get my drift.
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      12-09-2012, 09:33 PM   #4
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That's what I'm running too, I keep my car in the garage and there was definitely a noticeable smell after put the down pipes on but nothing I can't handle. I don't mind. And I love the added sound.
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      12-09-2012, 09:44 PM   #5
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Catless DPs + Stock DP-Back Exhasut -- Because you removed the primary cats (Which are the only ones that matter), you will still need a DP Fix to Pass OBD Port Testing. You probably won't pass a sniffer test with just the Secondary Cats in
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      12-10-2012, 03:42 AM   #6
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good information so only get the dp fix for smog testing?!? i dont want any limp modes or anything like that.
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      12-10-2012, 11:12 AM   #7
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good information so only get the dp fix for smog testing?!? i dont want any limp modes or anything like that.
Get a tune (COBB, JB4 or PROcede) so you can maximize your gains & not have to drive around with a CEL. The DP Fix will only let you pass an OBD Test by simulating a "Readyness" status
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      12-10-2012, 11:36 AM   #8
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I have dps and no sec cats minimal smell but I do see a bit more smoke..... I thought it was condensation but after a wot the other day I saw quite a bit of smoke.
Turbos might be going
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      12-10-2012, 12:03 PM   #9
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any other way to tell if the turbos are going besides smoke ? ive always wondered about what condition mine were in ... but i have stock downpipes and secondaries so the smoke probably wouldn't show ?


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Originally Posted by Randomaccess335 View Post
I have dps and no sec cats minimal smell but I do see a bit more smoke..... I thought it was condensation but after a wot the other day I saw quite a bit of smoke.
Turbos might be going
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      12-10-2012, 12:46 PM   #10
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Quote:
Originally Posted by N54King
any other way to tell if the turbos are going besides smoke ? ive always wondered about what condition mine were in ... but i have stock downpipes and secondaries so the smoke probably wouldn't show ?


Quote:
Originally Posted by Randomaccess335 View Post
I have dps and no sec cats minimal smell but I do see a bit more smoke..... I thought it was condensation but after a wot the other day I saw quite a bit of smoke.
Turbos might be going
You would be burning a lot of oil and would hear a siren noise.
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      12-10-2012, 12:50 PM   #11
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guess mine are behaving then, oil consumpition is in check and havent heard any sirens recently other then the cops haha


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You would be burning a lot of oil and would hear a siren noise.
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      12-10-2012, 01:33 PM   #12
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I have never seen the catless dp/catted tail section in the shop. I'm really curious as to the smell level compared to fully catless. Anyone done both? Comments?
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      12-10-2012, 01:45 PM   #13
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I've got catless DPs with stock midpipes and stock catback. On a true cold start in my garage (with the garage door open obviously ) I smell gas easily, because the secondaries haven't warmed up yet. Once they're warm, they reduce the gas smell significantly- you can't smell it from inside the car unless windows are all the way down and you're stopped at a light. Even then I rarely ever notice the smell and it is extremely faint.
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      12-10-2012, 04:05 PM   #14
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any other way to tell if the turbos are going besides smoke ?
Data Log -- If the turbos aren't hitting the boost target, something's wrong/broken.
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      12-10-2012, 04:29 PM   #15
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Quote:
Originally Posted by Beemw335 View Post
You would be burning a lot of oil and would hear a siren noise.
This isn't true. My turbo's are making the siren noise along with many other cars (~65% according to my poll) and turbo's are fine. Boosts good, no smoke.
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      12-10-2012, 05:05 PM   #16
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Quote:
Originally Posted by benzy89 View Post
Data Log -- If the turbos aren't hitting the boost target, something's wrong/broken.
That's not necessarily true. If you're under shooting target it could simply mean the turbos can't give you what you're targeting. More common north of 6000 rpm.
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      12-10-2012, 05:06 PM   #17
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Quote:
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This isn't true. My turbo's are making the siren noise along with many other cars (~65% according to my poll) and turbo's are fine. Boosts good, no smoke.
+1 although the turbos may not last forever, siren does not mean catastrophic failure is coming soon.
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      12-10-2012, 05:56 PM   #18
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The main problem is that secondary cats will clog up. Because primary cats filtering and after they becoming worm/hot burning all kind of sh*t. If you will go just with secondary cats they will not last long...
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      12-11-2012, 12:13 PM   #19
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Quote:
Originally Posted by benzy89 View Post
Data Log -- If the turbos aren't hitting the boost target, something's wrong/broken.
it will tell you SOMETHING'S wrong, but might have absolutely nothing to do with the snails though. I mean if you're maxing fuel trims then you might not reach your boost targets. I guess you can look at WGDC, right?
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      12-11-2012, 01:38 PM   #20
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There is a slight difference in smell from full catless to secondary cats still installed. When I had just catless downpipes and I still had secondary cats the smell was barely noticeable but still apparent compared to fully catted.

Fully catless to me is quite obnoxious. I've had a few cars with full catless modifications and I dont think I will ever go back to it. I dont miss pulling up to lights and catching a wiff of fumes.

As far as turbo's going out, smoke out the back is a common culprit, elevated Wastegate duty cycles are another, but one would need to ensure their are no boost leaks before blaming the turbo's.

Siren noises CAN be a common characteristic on this car. It's a tiny fan blade that spin's 10's of thousands of RPM's, it's going to make some noises. Obnoxious sire noises at light cruising when the car is full warmed up, along with elevated duty cycles to reach boost target and or oil consumption or smoke out the back may be a sign of turbo failure.

If your car is running like a champ, don't worry. If you have some smoke out the back it does not necessarily mean your turbo's are on the way out either.

Every scenario does not have an A + B = C

One must encompass many details before singling out that one symptom = one failure every time.
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      12-11-2012, 04:58 PM   #21
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Quote:
Originally Posted by Jeff@topgearsolutions View Post
As far as turbo's going out, smoke out the back is a common culprit, elevated Wastegate duty cycles are another, but one would need to ensure their are no boost leaks before blaming the turbo's.

Siren noises CAN be a common characteristic on this car. It's a tiny fan blade that spin's 10's of thousands of RPM's, it's going to make some noises. Obnoxious sire noises at light cruising when the car is full warmed up, along with elevated duty cycles to reach boost target and or oil consumption or smoke out the back may be a sign of turbo failure.

If your car is running like a champ, don't worry. If you have some smoke out the back it does not necessarily mean your turbo's are on the way out either.

Every scenario does not have an A + B = C

One must encompass many details before singling out that one symptom = one failure every time.
This.

Your best bet is to start datalogging. If you don't know how to interpret the logs, post em here & we'll be happy to point you in the right direction.
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      12-11-2012, 11:05 PM   #22
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Quote:
Originally Posted by benzy89 View Post
Get a tune (COBB, JB4 or PROcede) so you can maximize your gains & not have to drive around with a CEL. The DP Fix will only let you pass an OBD Test by simulating a "Readyness" status
purchasing my cobb some time this week and got my AR dp's installed today
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