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BMW Diesel Owners / Enthusiasts
Do you own a diesel powered BMW? Maybe a 335d or a BMW x35d? Come and talk about what makes your car great!

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  #26  
Old 03-01-2012, 02:17 PM
Snipe656 Snipe656 is offline
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Originally Posted by cssnms View Post
Eliminating the cat will more than likely cause problems for the urea injection system. There is a n02 sensor just after the car. Removing the cat will likey increase the n02 output which would then trigger the def to inject more urea and or possibly throw codes. i thought about this long and hard and it wasn't a risk i was willing to take at least until someone can demonstrate they can reprogram the ecu/def. the dpf can be deleted and the ecu reflashed to accomodate for this. there is a company in europe offering this service for u.s. cars and i believe there is a u.s. company on the west coast now offering this service. not sure if one can delete/remove the dpf without addressing the def system though.
I know on some other cars to get past such issues people put in "dummy" sensors. Basically they feed back to the ECU what the ECU wants to normally see. Probably something we'd never see for our cars since imagine would entail a bit of R&D
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  #27  
Old 03-01-2012, 04:24 PM
BMWTurboDzl BMWTurboDzl is offline
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Why would u want to do this anyways?

Sent from my MB525 using Bimmer App
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  #28  
Old 03-01-2012, 04:43 PM
Snipe656 Snipe656 is offline
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If you are asking why for removing the cat then my guess is in hopes of unrestricting the exhaust flow and in turn making more power. I'd think the DPF though is the biggest restriction. Another reason might be in hopes of having a more aggressive sounding exhaust.
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  #29  
Old 03-02-2012, 05:06 AM
2000se 2000se is offline
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Mein Auto: 335d sedan


ecotune seems to have removed the dpf.. check this vid out.

The only problem I see is that I feel terrible about "knowingly" polluting the air by removing it...At least the DPF makes the exhaust somewhat cleaner...
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Last edited by 2000se; 03-02-2012 at 05:11 AM.
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  #30  
Old 03-02-2012, 07:04 AM
cssnms cssnms is offline
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Other tuners can tune to remove the dpf, like Evolve. But removing the dpf is only one piece of the puzzle, the other is the def system.
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  #31  
Old 03-02-2012, 07:11 AM
Snipe656 Snipe656 is offline
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Do you think the DEF physically needs to be removed or is just bypassing it via programming more than sufficient? I am just guessing it physically is not an obstruction or much of one to the exhaust flow.
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  #32  
Old 03-02-2012, 07:14 AM
cssnms cssnms is offline
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Originally Posted by Snipe656 View Post
Do you think the DEF physically needs to be removed or is just bypassing it via programming more than sufficient? I am just guessing it physically is not an obstruction or much of one to the exhaust flow.
I suspect just some coding/tuning to delete/disable it. I don't see the harm in leaving the tanks and injectors in place as I don't think it poses a restriction. But one would want to drain the tanks and clean everything since I suspect the urea reminance will crystalize over time.
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  #33  
Old 03-02-2012, 07:56 AM
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Axel61 Axel61 is offline
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that was a sweet video!!!
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  #34  
Old 03-04-2012, 11:11 AM
HIREN HIREN is offline
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That sounds wicked! I want that diesel turbo spool sound now! I'm surprised that there isn't that much smoke compared to diesel trucks. Thew new gen diesel engines seem to be smoking a whole lot less than the older ones.
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  #35  
Old 03-05-2012, 11:12 AM
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Axel61 Axel61 is offline
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I finally heard the video DAMN that was a SWEEET sound of turbo spool, I want one LOL
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  #36  
Old 03-05-2012, 11:17 AM
Snipe656 Snipe656 is offline
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I finally heard the video DAMN that was a SWEEET sound of turbo spool, I want one LOL
Take your car to Renntech and get the DPF/Cat bypassed and I bet you will have the sound of the turbo spooling.
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  #37  
Old 03-05-2012, 11:20 AM
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Axel61 Axel61 is offline
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@Snipe trust me I would but DAMN it I live in Puerto Rico
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  #38  
Old 03-05-2012, 11:22 AM
Snipe656 Snipe656 is offline
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@Snipe trust me I would but DAMN it I live in Puerto Rico
Come on now, man up and get that thing shipped to them so we can see what it takes.
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  #39  
Old 03-05-2012, 11:24 AM
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Axel61 Axel61 is offline
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Ok Ill man up but the tabs on YOU!!!
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  #40  
Old 03-05-2012, 11:44 AM
Snipe656 Snipe656 is offline
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Just let me know what the bill is after they are all done. I got some buddies that still work on shipping vessels, maybe we can sneak the car into a cargo hold for some free shipping ....
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  #41  
Old 03-05-2012, 11:47 AM
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Axel61 Axel61 is offline
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@snipe to difficult for me , **** you live in the states you MAN up amigo. Touche my friend, or better yet let Flyingman go for both of us he lives in MIAMI, WTF. Flyingman your up next to bat, we got your back amigo!!
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  #42  
Old 03-05-2012, 11:50 AM
Snipe656 Snipe656 is offline
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I would but I just spent all of my car fund on a new toy for my garage. So unfortunately Flyingman needs to step up to the plate on this one.
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  #43  
Old 03-05-2012, 11:51 AM
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Axel61 Axel61 is offline
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yes indeed batter up!! Flyingman you are the man!!!!
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  #44  
Old 03-08-2012, 07:42 PM
lddrew lddrew is offline
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car sounds really good!
the way i see it is that if you ditch the emissions systems and get a considerable amount better hp/tq and mpg's. the overall effect is not very bad. at 50mpg's the emissions from a cleanly tuned 335d would be nothing compared to many of the older diesels still on the road. and you don't have to buy a gas guzzling v8 to go fast

Just my thoughts on the matter
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  #45  
Old 03-08-2012, 10:22 PM
ljgmdad ljgmdad is offline
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They do some very nice work. The welds are very neat and clean. Very nice.

I agree on the tips. I'd actually prefer to keep the stock tips and stay stealth. But, as you say, tips are quick and easy to change at any time as your tastes might change.

PS - Yes cats muffle a lot of sound. I did a custom exhaust on a Corvette many years ago. And it wasn't until I found a guy to fabricate some flanged straight pipes that I could bolt in as (temporary ) replacements for the cats that the sound of the whole system really came to life.
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  #46  
Old 03-09-2012, 03:36 AM
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Flyingman Flyingman is offline
hang up and drive!
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Simmer down guys, I'm just a middle aged commuter minding his own business here in South Florida. Driving at 120mph in his turbo "D", Baby!
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  #47  
Old 03-09-2012, 09:38 AM
Talstar Talstar is offline
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Love to hear the turbo spool, reminds me of my grand national.
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  #48  
Old 03-09-2012, 09:41 AM
Snipe656 Snipe656 is offline
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Quote:
Originally Posted by ljgmdad View Post
PS - Yes cats muffle a lot of sound. I did a custom exhaust on a Corvette many years ago. And it wasn't until I found a guy to fabricate some flanged straight pipes that I could bolt in as (temporary ) replacements for the cats that the sound of the whole system really came to life.
They do muffle a lot of sound but any car with a cat and no DPF can have a pretty nice sounding exhaust. All the vehicles with the DPF though it really seems that the DPF absorbs a lot of the sound and makes changes downstream not near as significant.

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Love to hear the turbo spool, reminds me of my grand national.
Reminds me a good bit of my trucks turbo.
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  #49  
Old 03-09-2012, 11:22 AM
lddrew lddrew is offline
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I know in the truck world, a DPF back exhaust is basically considered a waste of money. Not a whole lot of sound gains for your dollar. Gotta get rid of that filter if you want it to scream
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  #50  
Old 03-10-2012, 08:24 AM
UncleJ UncleJ is offline
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So after all this, did the OP actually get any measurable gains or not?
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