[AirBull]

I love my 335d, but am uncomfortable about how much it may cost to maintain down the road in regards to the CBU issue, (thanks for your support, BMWNA.)

I'm toying with the idea of an ECU tune - can anybody speak to either side of the equation, how that could affect the CBU issue? Am I just going to just expedite the CBU?

[austinla335d]

Originally Posted by AirBull

I love my 335d, but am uncomfortable about how much it may cost to maintain down the road in regards to the CBU issue, (thanks for your support, BMWNA.)

I'm toying with the idea of an ECU tune - can anybody speak to either side of the equation, how that could affect the CBU issue? Am I just going to just expedite the CBU?

If you mean just for extra power, it will do nothing.

Methanol/Water injection is a proven remedy. It's fairly cheap, safe, etc.

If you're interested in a tune that will allow you to remove DPF, EGR, SCR- you're messing with emissions stuff and need to figure that out (smog; what's your level of comfort with this sort of thing) you'll b in great shape. I would do the latter two options and have already begun to. Meth, and a tune, and eventually add to the tune the dpf/EGR/SCR delete. I get really excited about it but then I get a little intimidated by it. Back and forth. But I've got 2 full years before my warranty expires.

[austinla335d]

Originally Posted by austinla335d

If you mean just for extra power, it will do nothing.

Methanol/Water injection is a proven remedy. It's fairly cheap, safe, etc.

If you're interested in a tune that will allow you to remove DPF, EGR, SCR- you're messing with emissions stuff and need to figure that out (smog; what's your level of comfort with this sort of thing) you'll b in great shape. I would do the latter two options and have already begun to. Meth, and a tune, and eventually add to the tune the dpf/EGR/SCR delete. I get really excited about it but then I get a little intimidated by it. Back and forth. But I've got 2 full years before my warranty expires.

And by the way, I plan to fork out the approximately $1k for carbon cleaning just before my warranty expires, so that when I delete emissions and keep it clean and fast with injection, I've got a clean slate.

[eurojulien]

tl/dr

tunes can reduce EGR duty cycle (like rc), or delete it if you ditch the DPF

[Puerto Rican 335d]

dont spend your money for the CBU clean up, I suggest spend it on meth tank and TUNE. the meth will not be as great as the actual cleaning but will help rid most of the CBU and keep it clean I believe so; after that go dpf/egr/scr delete

[BB_cuda]

@Airbull, you're in TX so no emission check when state inspection is done. If not scared of warranty implications, DPF/EGR/SCR delete is an option. The EGR block off is the most important in the context of halting CBU any further.

Question, why would you have cleaning done at end of warranty on your dime? You might "luck out" and get the problem/SES light/poor mileage/fill in reason here and have it cleaned at BMWNA expense.

I have not heard of anyone having EGR coded out by itself but this is an option with the proper block off kit installed too.

I see you're in DFW. I was just in Arlington last weekend

[DieselRacer]

A tune might add to the buildup of soot faster in your dpf, but for CBU I would think not, just for the reason some cars are clean 70k and some cars have CBU at 20k, so its a crap shoot when It comes...