DPF Delete Pipe & ECU Reflash Source

[bawareca]

CAT will help with CO only. DPF is what takes care of the soot and SCR is what takes care of the NO and the smell. My X5 with ~400hp/550tq will make a slight haze under hard acceleration, nothing like a rolling coal. After a few days of very hard driving the hatch and the rear bumper will have a slight tint from the soot.

[Ricky Bobby]

Originally Posted by bawareca

CAT will help with CO only. DPF is what takes care of the soot and SCR is what takes care of the NO and the smell. My X5 with ~400hp/550tq will make a slight haze under hard acceleration, nothing like a rolling coal. After a few days of very hard driving the hatch and the rear bumper will have a slight tint from the soot.

I would recommend the cat personally as it will help more with the smell than not having it - Rawtek Performance in Canada actually prides themselves on sourcing a catalyst in their TDI systems that takes care of 95% of the smell - I actually am going to email them to see if they are developing something for the 335D/35D

Would almost be best of both worlds to delete DPF and EGR to open up the engine breathing yet retain SCR/urea injection to take care of the smell/NO
- I wonder why that hasn't been done before, I guess because people don't want to be bothered with piss injection -

[basilray]

Originally Posted by Ricky Bobby

I would recommend the cat personally as it will help more with the smell than not having it - Rawtek Performance in Canada actually prides themselves on sourcing a catalyst in their TDI systems that takes care of 95% of the smell - I actually am going to email them to see if they are developing something for the 335D/35D

Would almost be best of both worlds to delete DPF and EGR to open up the engine breathing yet retain SCR/urea injection to take care of the smell/NO
- I wonder why that hasn't been done before, I guess because people don't want to be bothered with piss injection -

I'll second that.

DEF is cheap. I've got no problems topping that up, assuming SCR functionality can be maintained while deleting the DPF and re-circulation of exhaust gas though my engine. At the end of the day, I'm not trying to be green, but if I could curb some of the output while opening up the performance and longevity...it would feel like a happy compromise.

[Thecastle]

Originally Posted by basilray

I'll second that.

DEF is cheap. I've got no problems topping that up, assuming SCR functionality can be maintained while deleting the DPF and re-circulation of exhaust gas though my engine. At the end of the day, I'm not trying to be green, but if I could curb some of the output while opening up the performance and longevity...it would feel like a happy compromise.

Typically your SCR won't last long with a DPF delete. The SCR isn't designed to handle all the soot that passes through the system when you remove the DPF and clogs up after a few K miles. ABC delete without gutting SCR

In this case delete the DPF and SCR together or neither, its easier on an X5 than it is on a 335d. The only one that can be done independently is the EGR delete.

[bawareca]

Originally Posted by Thecastle

In this case delete the DPF and SCR together or neither, its easier on an X5 than it is on a 335d. The only one that can be done independently is the EGR delete.

Well, deleting the EGR will result in a clogged DPF very soon. As you say it is all or nothing.
The emission stuff is there for a reason, not only user headache. The fact is, once the emission stuff gets deleted the car will stink and smoke and there is no way around it. Could be more, could be less, but it will be nothing like an original car.
I miss my clean car in a way, but everytime i step on the gas the regrets are gone with the smoke in the mirror

[Thecastle]

Originally Posted by bawareca

Well, deleting the EGR will result in a clogged DPF very soon. As you say it is all or nothing.
The emission stuff is there for a reason, not only user headache. The fact is, once the emission stuff gets deleted the car will stink and smoke and there is no way around it. Could be more, could be less, but it will be nothing like an original car.
I miss my clean car in a way, but everytime i step on the gas the regrets are gone with the smoke in the mirror

Some things maybe different between tuners. I'm aware that both BPC and JR Tuning offer EGR delete with the rest of the emissions systems active (DOC/DPF/SCR in place and on). I personally have such a tune, and they offer multiple EGR options including, a full EGR tune out, or a partial so that the EGR is only active during cold starts and or during DPF regens (not required, but improves fuel efficiency). EGR partially or fully disabled opinion?

Also Lots of folks run EGR blocks with no tunes and have done so successfully for > 60K miles. Hooper on the 335d forums blocked his EGR with no software tune for for more than 60K miles and the car functioned normally (other than an SES every 2nd start until it was erased) Those with the blocked EGR

The X5 does have 2 EGR paths unlike the 335d which makes things a bit more complicated to block.

I'm running a JR Stage 2 Tune with EGR delete and have not had an issue with my DPF becoming sooted up, it still does normal regens, been very happy with the tune.

T

[bawareca]

Originally Posted by Thecastle

Also Lots of folks run EGR blocks with no tunes and have done so successfully for > 60K miles. Hooper on the 335d forums blocked his EGR with no software tune for for more than 60K miles and the car functioned normally (other than an SES every 2nd start until it was erased) Those with the blocked EGR

The X5 does have 2 EGR paths unlike the 335d which makes things a bit more complicated to block.

I'm running a JR Stage 2 Tune with EGR delete and have not had an issue with my DPF becoming sooted up, it still does normal regens, been very happy with the tune.

T

Of course it works, but it is not a foolproof solution. DPFs get clogged even on a stock cars due to some factors, if drivers are not aware of the engine condition. The fact that you know your engine regenerates means that you are aware and EGR only delete will work for you. But if you live in colder climate and give the X to your wife the problem will arise sooner than later.

[seattle]

Originally Posted by Ricky Bobby

e 335D/35D

Would almost be best of both worlds to delete DPF and EGR to open up the engine breathing yet retain SCR/urea injection to take care of the smell/NO
- I wonder why that hasn't been done before, I guess because people don't want to be bothered with piss injection -

I would guess NoX sensors would get fouled pretty quick with DPF absent.
Unless, the solution is to ignore NoX sensors and just pump urea at constant rate (or based on RPM).

[Thecastle]

Originally Posted by bawareca

CAT will help with CO only. DPF is what takes care of the soot and SCR is what takes care of the NO and the smell. My X5 with ~400hp/550tq will make a slight haze under hard acceleration, nothing like a rolling coal. After a few days of very hard driving the hatch and the rear bumper will have a slight tint from the soot.

I'll mention.....

There is some benefit of keeping the DOC. The Diesel Oxidation Catalyst (DOC) not only reduces Carbon Monoxide (CO), but also unburned hydrocarbons and organic soot. So without it is much like running a car hatless and will result in more diesel stink. Its the unburned HC that makes diesel stink.

There are downpipes that remove the DPF but include a DOC to reduce the stink. North American 335d Post DPF Removal Exhaust Ideas - Page 9