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Pros and Cons of DPF Delete

HBC08

As per the thread title.

I have a 2011 2.0l Peugeot diesel.Its a brilliant car and wants for nothing.Ive had it for 7 years and over that time the DPF warning light has come on 3 times.Each time I've used the DPF cleaner and drive the car 60km over 3000 RPM on motorway.This has worked every time.It popped up again today,I did what I usually do but this time it hasn't worked.

I'm thinking I might just have the DPF deleted.Are the actually any mechanical/performance downsides to this?

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ELM327

Cons? None other than regulations. Make sure to get EGR done as well (and adblue if it has it), and then get all 3 mapped out properly. Don't just cut out the DPF and not map it out as this may be damaging.

Also make sure to leave a gutted dpf in place not a straight pipe, for NCT checks.

User1998

Apart from the legal and ethical implications there are no real cons. Engine will perform much better. Your car wouldn’t have Adblue so it won’t interfere with that

Edit: Actually, if you decide to get a power remap along side it which many people do, that will wear out parts a bit quicker, turbo, flywheel etc

HBC08

Just to say it doesn't have Ad Blue so no issues there.

It seems its a no brainer going on above info

HBC08

https://www.boards.ie/discussion/comment/123471354#Comment_123471354

Thanks,

I considered getting remapped before but decided against it for the reasons you mention.

User1998

https://www.boards.ie/discussion/comment/123471389#Comment_123471389

You can get an economy remap as well. No extra power just better fuel consumption.

HBC08

https://www.boards.ie/discussion/comment/123471404#Comment_123471404

That's good info,I didn't know about that.

Damien360

Talk of this in our house with new (2016 A6). Son is on about EGR removal and a box in place instead, gutting DPF and putting in a straight pipe, remap but not a power map.

Can someone explain the EGR removal part please, specifically, is it just a map so valve stays open or does not open and what welded box is he possibility on about. The DPF straight pipe inside body of gutted DPF I understand plus mapping out adblue and EGR function. What would be a typical cost of this ?

PukkaStukka

There's talk of the NCT being able to detect a missing DPF using exhaust content and measuring pressures. If that comes in, a car will instantly fail if the DPF has been removed. As an aside, I would've thought fixing the issue that's blocking a DPF in the first place is probably cheaper and less risky than removing the DPF and remapping that vehicle?

BlakeS94

I have that engine in my Mondeo, DPF gutted EGR deleted and a power map, 160k miles on mine and the car shudders going past 2k revs at wide open throttle so if you're due a flywheel it'll bring that on sooner, can even see the spike in power and the rolling road printout at 2k revs. easy drive around it though, if I'm flooring it I'll wait until 2.5k revs and all is well. Been a couple years now and no issues with it since.

Power map yields increased economy due to not needing to press the accelerator as much to get the car going. Youll drive the car harder through excitement at first, then the novelty wears off and youll gain mpg from not flooring it every chance you get.

To the best of my knowledge an Economy map still has some bhp and torque increases, it's just not the main priority.

BlakeS94

https://www.boards.ie/discussion/comment/123471436#Comment_123471436

EGR delete is just through software, the valve will be commanded closed in all scenarios.

DPF filter is just drilled out, box stays in place, depending on setup of car the dpf may be removed, cut open, filter removed and welded back together, usually welded at the top so it'd never be seen when installed.

I paid €450 for dpf egr and a remap from a reputable mechanic that knew what he was doing.

User1998

https://www.boards.ie/discussion/comment/123471455#Comment_123471455

The mechanics and DPF cleaning companies who don’t offer a removal service have been peddling that information for about 10 years now. There is already a visual inspection of the DPF and theres no obvious plans to make any changes to this.

Most cars being sold now don’t even have a DPF. Its all EV, hybrid, or petrol these days so I can’t see any NCT changes being brought in personally.

robertpatterson

A lad in work had it done on his golf, it flies through every nct according to him on emissions anyway

mondeoman72

On a mondeo, they take the exhaust off, cut dpf open in the top side (facing underbody), hollow it out and weld it back together. Then refitted and you cannot see the welds at all. Passed NCT about 4 times since. Depending on where you are, maybe talk to coby autos at red cow…. Also do remaps and the mondeo is still going strong 4 years later.

prawnsambo

Just be careful with the remap. There's been quite a few horror stories on here about what happens when you get a monkey doing the remap.

Also getting the DPF cleaned can often work out cheaper.

HBC08

I spoke to my mechanic.

He said the next step is a forced regeneration (which he'll do tomorrow)

He has a lot of experience with PSA engine and strongly advised against DPF delete in this instance.

prawnsambo

https://www.boards.ie/discussion/comment/123472001#Comment_123472001

Sounds like a genuine guy. He's right, it's a particulate filter and takes some pretty noxious stuff out of the atmosphere.

BlakeS94

https://www.boards.ie/discussion/comment/123472001#Comment_123472001

It's advisable to get an oil change after a forced regen.

Also a forced regen should be absolute last port of call, it's a lot of added stress on an engine.

HBC08

https://www.boards.ie/discussion/comment/123472084#Comment_123472084

What others options are there?

This seems to be the options in order

Drive over 3000rpms for 30 mins on motorway with cleaning addictive

Force regeneration

Clean DPF

Replace DPF

Remove DPF

HBC08

He's very sensible when it comes to my wallet and my car.

You couldn't meet a man that cares less about the environment or noxious fumes though!

HBC08

Delete

(What the fook is wrong with this site..)

Can't delete post anymore

BlakeS94

https://www.boards.ie/discussion/comment/123472134#Comment_123472134

Option number 1 would be find and sort whatever issue is causing the DPF to not regen.

Fuel vaporiser attached to exhaust can give trouble, has your mechanic checked the DPF pressure sensor readings on a scan tool to see if DPF is blocked or if there's an issue with the pressure sensor itself? Glow plugs could need doing, ambient air temp sensor being bad can cause DPF issues.

Getting the DPF cleaned using high air pressure and a proper cleaning agent fed through a high pressure gun is more effective than letting it do a forced regen.

DPFs very rarely actually need to be replaced, but if you do a forced regen and the DPF is in fact blocked, it will get too hot and will probably crack the DPF. certain things need to be checked before just going ahead and running a forced regen.

HBC08

https://www.boards.ie/discussion/comment/123472194#Comment_123472194

That all sounds reasonable.

He's a former Peugeot mechanic so he'll do a diagnostic first I'm sure.

Flinty997

Won't repeat what been said before.

But I've noticed the fumes of some diesels is really bad, like gives you a bad headache bad. I assume it's from a dpf delete.

Kinda crazy the NCT doesn't check for it.

Henry Ford III

Legal and ethical considerations are paramount.

HBC08

https://www.boards.ie/discussion/comment/123472919#Comment_123472919

Not for everyone.

In my case for example it would be purely mechanical and financial.

bcklschaps

https://www.boards.ie/discussion/comment/123472537#Comment_123472537

You will know pretty much straight away if a car has the DPF removed. It will stink to high heaven and be far smokier especially at cold start-up or hard acceleration. The guys in the NCT will know the score but there's no actual 'DPF' test in the NCT... only emissions... soo as long as it passes emissions you're grand.

Summitatem

https://www.boards.ie/discussion/comment/123471455#Comment_123471455

Pressure drop across a functioning DPF is minimal.

Henry Ford III

https://www.boards.ie/discussion/comment/123472947#Comment_123472947

Absolutely for everybody.

Ignoring these considerations is horribly selfish and irresponsible, and an insult to your environment and everyone living in it.

BrianD3

Plenty of people (including myself) driving around in diesel cars that never had a DPF.

The cars sold by Renault during the scrappage scheme mostly had no DPF and these cars have proven to be very reliable, economical and hassle free.

I don't have strong views either way on the ethical/moral implications of removing a DPF from a car that originally had one but because I'm goody two shoes, I probably wouldn't do this.

If a DPF was expected to last 200k kms and could be replaced for say, 1000 euro with a high expectation that the new one would last a further 200k then not so bad. We know that this isn't the case. Other factors can affect the DPF and many mechanics don't know how to diagnose and fix diesels. They also contribute to problems by using the wrong oil because they don't understand the implications and/or don't give a sh*te.

I'm currently looking at used diesels from about 2015-2018 from dealers and haven't yet found one that I'm confident is running correctly. Could well be DPF related. Idle lumpier than it should be, random small hesitations and fuel economy clearly not what it should be. Most buyers wouldn't spot these things.

User1998

https://www.boards.ie/discussion/comment/123473556#Comment_123473556

Don’t you own an old Ford of some sorts? Does that car even have a catalytic converter? Very selfish and irresponsible owning a car like that. Whats the emmisions rating? Euro 1?