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Discussion Starter #1
So I've had my 159 for a couple of months now. I was recommended by an Alfa specialist to clear the dpf about once a month by dropping it down to 4th when on the motorway and keep it at about 3000 revs for about 20mins. I did this but I noticed nothing.

Should I have? Was expecting some sort of bang and a cloud of black smoke coming out he back!
 

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It should happen when required.

There are certain criteria for it to happen etc but you will have had a few by now.

For it to happen you have to be at the right temp, speed, revs and in need of regen.

Problem starts when you need a regen and you never meet the regen criteria....
 

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hello dan! as far as i know it does not work this way. engine keeps monitoring a lot of variables and when acu calculates that dpf is filled and needs cleaning, it will initiate cleaning routine. it might happen anytime and i don't believe you can initiate it at will. except maybe when regen is close due because ecu coding favors to start regen when variables are most favorable. for example, when keeping constant speed like people usually do on highway.

dpf cleaning is actually simple. multijet engine injects additional fuel rising the temperature of output gasses significantly thus burning all the particles in the filter.

you can recognize dpf regeneration by several factors. higer fuel consumption, distinctive smell of burnt ... charcoal? also, when you stop after or during regen exhaust pipe is really hot.

if your driving style just cannot support dpf regen (like when driving only few miles distances) the car will eventually, after few failed attempts, tell you that dpf is regenerating and you should not turn off the car until it finishes.

hope i was helpful!
 

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So I've had my 159 for a couple of months now. I was recommended by an Alfa specialist to clear the dpf about once a month by dropping it down to 4th when on the motorway and keep it at about 3000 revs for about 20mins. I did this but I noticed nothing.

Should I have? Was expecting some sort of bang and a cloud of black smoke coming out he back!
As long as you take it on a fairly long motorway run every now and then and give it the beans, the dpf shouldn't clog. Drive the car as it is supposed to be driven basically :thumbs:
 

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If you do a lot of motorway miles it won't regen at all as it naturally burns off
 

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Another good way to spot if it is doing a regen is when you lift off the throttle the turbo gauge will drop instantly rather than gradually as it does normally, you might also notice that the exhaust sounds different, a deeper sound
 

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Another good way to spot if it is doing a regen is when you lift off the throttle the turbo gauge will drop instantly rather than gradually as it does normally, you might also notice that the exhaust sounds different, a deeper sound
+1
The fuel consumption will drop through the floor too....when mine goes into regen mode, I use it as an excuse to nail it, I consider it my duty to help clean out the tubes :cool:
 

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Discussion Starter #8
Cheers for your responses guys. When you say the fuel consumption drops considerably, by how much? For example, I was getting about 45mpg today on the m4 coming back from brighton (saw 3 or 4 159s which was nice). That was doing 75/80 ish.

What would the current consumption likely drop to in that scenario?

As it happens I've got a new job since getting the car which involves a 15min commute across town. Not ideal considering the dpf issue, but it should get a good 2-3 hour blast on the motorway once or twice a month so I'm hoping that will 'compensate'.
 

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During a regen at motorway speeds your likely to see below 20mpg but it doesnt last for long, as has been said if you do get a regen knock it down a gear to keep the revs up a bit which will help it.
 

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Cheers for your responses guys. When you say the fuel consumption drops considerably, by how much? For example, I was getting about 45mpg today on the m4 coming back from brighton (saw 3 or 4 159s which was nice). That was doing 75/80 ish.

What would the current consumption likely drop to in that scenario?

As it happens I've got a new job since getting the car which involves a 15min commute across town. Not ideal considering the dpf issue, but it should get a good 2-3 hour blast on the motorway once or twice a month so I'm hoping that will 'compensate'.
If you watch the instant MPG readout you will notice it drop 10 or 15mpg down on what you would expect, and the turbo boost guage usualy sits on 0, you can hear the different exhaust note if you have the window open. At this point your better off dropping 2 gears down to get it reving higher than normal, I think it usualy last 10 minutes or so, very anoying. You will know it did not complete if next time you go to start you get loads of smoke out the exhaust.
Rob
 

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I can't wait to get this done.....I was thinking of treating my girlfriend to an AHM re-map, dpf remove, and egr delete for christmas....she doesn't seem too keen and seems to think it's a bit sefish :rolleyes:
Rich, not wanting to poo poo on AHM, but there was a write-up earlier this week about a place in Watford that does the same for £400 all in and has got great reviews from a few people

I've booked mine in for Friday 2nd Dec and can't wait :inlove:
 

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Rich, not wanting to poo poo on AHM, but there was a write-up earlier this week about a place in Watford that does the same for £400 all in and has got great reviews from a few people

I've booked mine in for Friday 2nd Dec and can't wait :inlove:
That was me :) and I can definitely recommend both the procedure and Proalfa in Watford.

@smudge_don: £400 was the cost of the work but without the rolling road before & after analysis - have you opted not to have it?

I would really recommend you do this because, not only will you get a nice graph showing before and after, but it will enable the tuning people to ensure the map they give you is optimised for your particular car. In fact I'd go so far as to say it's essential (like I did in my write-up); I'm quite surprised Proalfa don't just say the whole thing costs £450 and include the rolling road analysis as part of it.

I had a drop in torque / power after the initial surge (see the graph I posted in my write up thread) and the tuning guy kept it a bit longer to ensure he'd smoothed it out before finishing the job.

Edit: Oh crap - just remembered you've got a Q4, and they can't put them on the rolling road! :-(
 

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That was me :) and I can definitely recommend both the procedure and Proalfa in Watford.

@smudge_don: £400 was the cost of the work but without the rolling road before & after analysis - have you opted not to have it?

I would really recommend you do this because, not only will you get a nice graph showing before and after, but it will enable the tuning people to ensure the map they give you is optimised for your particular car. In fact I'd go so far as to say it's essential (like I did in my write-up); I'm quite surprised Proalfa don't just say the whole thing costs £450 and include the rolling road analysis as part of it.

I had a drop in torque / power after the initial surge (see the graph I posted in my write up thread) and the tuning guy kept it a bit longer to ensure he'd smoothed it out before finishing the job.

Edit: Oh crap - just remembered you've got a Q4, and they can't put them on the rolling road! :-(
You got there in the end mate lol

I had her rr'd on Saturday and will do again this Saturday following the work. any dips or areas of the graph that i don't like and i can take it back for some tuning :)
 

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Rich, not wanting to poo poo on AHM, but there was a write-up earlier this week about a place in Watford that does the same for £400 all in and has got great reviews from a few people

I've booked mine in for Friday 2nd Dec and can't wait :inlove:
That sounds great! Look forward to hearing all about it. I'm undecided where I'll actually get it done yet, I don't want to hijack the thread and turn it into a remap fest, but I know that AHM will REPLACE the DPF with a pipe and let me have it back, rather than smash the innards out (which apparently SOME do). I don't really want anyone smashing anything OUT of my car! I also know that the map is highly recommended and will be tailored to my car. If anyone else does the same thing to the same high standard I'm all ears :)
 

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That sounds great! Look forward to hearing all about it. I'm undecided where I'll actually get it done yet, I don't want to hijack the thread and turn it into a remap fest, but I know that AHM will REPLACE the DPF with a pipe and let me have it back, rather than smash the innards out (which apparently SOME do). I don't really want anyone smashing anything OUT of my car! I also know that the map is highly recommended and will be tailored to my car. If anyone else does the same thing to the same high standard I'm all ears :)
Rich, read my thread entitled "Just had the DPF removed / EGR deleted / remap done" - it'll be on page 2/3 by now.

I have my DPF sat in a box in my garage - I also wanted it back just in case I ever had to replace it back into the car - and Proalfa replaced it with a tailored straight-through pipe. They even showed me what they'd done under the car :)

Plus the tuning that was done (by the tuning shop next door to them) was tailored to the car / my requirements. :thumbs:

I feel I'm coming across as being on the Proalfa payroll :) I was very pleased with my whole experience and so just wanted to share. I'm quite sure there are other places who do just as good a job out there, but I (of course) have no experience of them.
 

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Discussion Starter #20
DPF delete :thumbs:
Yep - bin that 7 kg block of hateful EU nastiness.
Well I'm considering this at some point. What slightly concerns me about doing it is the extra bhp putting a strain on different components (the qtronic gearbox for example). It's only done 28k and I intend to have it for a fair few years and probably well into 100k miles.

How many examples have had 100k+ miles put on them after the dpf removal?

Edit: if a mod could change the title to include this question then that would be helpful.
 
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