Swirl flaps m47 320d

[Rocky_cpt]

Howdy Gents,

Considering doing a swirl flap delete but I am getting mixed reviews on line.

I've read countless threads on BIMMERPOST and Fanatics threads that it should be done.., but then I also read it doesnt have to be done.

Does anyone currently have an e90 m47 320d with swirl flaps?

 

[Avir]

Hi. I had a E83 x3 M47 with the swirl flaps in place. Never removed them. Had no issues for a good few years.

 

[Rocky_cpt]

Hi. I had a E83 x3 M47 with the swirl flaps in place. Never removed them. Had no issues for a good few years.

Thanks Avir, did you do any preventative maintenance? I saw some people deep clean the ERG valve to reduce carbon build up

 

[Avir]

Hi I always checked the EGR valve and was always very clean.
Only preventative maintenance I did was always change the oil and oil filter at around 10k kmz. We changed the front and back diff oil, gear box oil, and brake fluid flush , just once. And new diesel filter. Also flush the radiator once. And we took the intercooler out and cleaned it. The intercooler just had very little trace of oil. All this was around 2018

 

[Avir]

This was 2019

 

[Solo Man]

Do it as soon as possible. I do it to all my BMW Diesels as i have on one occasion on a m57 diesel with about 160 k kms the one swirl flap hanging on a thread, already loose and hanging skew in the inlet tract held on with one screw. Rather be safe than sorry. At the same time disconnect the egr valve, take out the cat (you can get about R2k for the innards of the cat) and take out the small roll type oil filter in the oil Seperator that is on top of the engine and replace with the plastic oil separator which BMW sells.

 

[Rocky_cpt]

Do it as soon as possible. I do it to all my BMW Diesels as i have on one occasion on a m57 diesel with about 160 k kms the one swirl flap hanging on a thread, already loose and hanging skew in the inlet tract held on with one screw. Rather be safe than sorry. At the same time disconnect the egr valve, take out the cat (you can get about R2k for the innards of the cat) and take out the small roll type oil filter in the oil Seperator that is on top of the engine and replace with the plastic oil separator which BMW sells.

Thanks Solo. I got a quote for a Flap delete, but they said i need a retune? Is that normal? I have already done stage 1 + DPF. Not entirely sure the retune is needed in this instance. I am considering doing the EGR Delete too but I read that that could cause dashboard lights to come up. Not sure if that can be cleared?

 

[///Herbie]

Thanks Solo. I got a quote for a Flap delete, but they said i need a retune? Is that normal? I have already done stage 1 + DPF. Not entirely sure the retune is needed in this instance. I am considering doing the EGR Delete too but I read that that could cause dashboard lights to come up. Not sure if that can be cleared?

iirc swirl flaps help with swirling the air which affects A/F ratios so could be true, but I'm no expert.
If you do EGR delete they can just code it out seeing as you already have SW done to the car. Don't see why it needs a complete retune?