sd_dracula

just got the swirl flaps removed in my 05 520d and i do remember reading a really long thread on the forums and its supposed to have no adverse effect on the car, in fact its supposed to make it smoother.
different experience here i must say.
the car is really sluggish now and in low gears/low revs it barely accelerates. the car is remapped too so it seems like all the remap bonus is gone, that nice torque "pull" is all but gone. the car drives worse than before i did the remap and remove the flaps
no idea whats going on. someone else experience this? MAF sensor?

KAF

Don't see how removing the swirl flaps would do this as later cars were produced without them.

Almost sounds like a turbo malfunction.

sd_dracula

well the swirl flaps shouldnt affect it at all. the car was a bit like that before removing them anyway. is just that now you can feel it more.
the turbo works fine in higher gears/revs. i had a mechanic check the turbo parameters while driving and the computer showed its fine, but the MAF reading was fluctuating which is why i'm thinking its that. havent got a chance to remove it and clean it to see if it makes a difference.
do the e60s diesel have a limiter on the turbo on the likes of 1st and 2nd gear? according to specs should kick in at 1750 rpms.

jay77

A quick thing to try is unplugging the MAF and see it drives better check the vacuum lines as well... more likely them


Any error codes?

Anzafin

Sorry to hear, but I'm 100% sure it's not because of the removal of swirl flaps. It is something else. Unplug and replug all electric harnesses, check the charged air tubing etc.

I hope you get it solved.

- Antti -

ps. The long thread you're talking about locates on a DIY section.

ali-cap

As Antti says check and recheck all connections, vacum lines and electrical s.
I was distracted by tel/call during final assembly, then started the engine to my horror , engine light was on. After rechecking,I found the quick release clip on EGR was not in place. connecting it cured the problem. I have had the emission measured before and after removal and there is hardly any difference, performance is as strong as before.
Good luck

sd_dracula

ok so that was done by a mechanic who has done lots of these before so i know (hope) he didnt do anything wrong. he was saying he found a bit of oil in the EGR and he cleaned it. we will try the MAF tomorrow and see. no error codes show up but then again the MAF doesnt always show errors so hopefully its just that.
another thing i've noticed literally right after the flaps were taken out is that the car doesnt mind as much if for example you're in 5th gear and doing 80km which it didnt like before. and also now its really hard to even get to 3000 rpm in 4th 5th or 6th gear! before it was going up real fast if you floor it, can still feel the turbo kicking in tho. is that normal?

Anzafin

Could be the clogged DPF. Check all the vacuum pipes in the engine compartment also. They tend to get brittle.

- Antti -

sd_dracula

yeah guess i'm going to get my guy to have a look at all those things at the weekend. thanks.

jas_r_1

Any updates?