So since my car is going for its test next month,I can start getting things in order for making a bit of power out of it. I'm hoping to remove the egr and dpf. Does anyone have any suggestions on a dpf less downpipe? I want to run without a dpf mostly because I dont want the expense of having to buy a replacement to get through emissions. I want to be able to swap it back whenever it goes for its next test which would be august 2022 providing it passes this time.

You won't increase power by removing emissions reduction systems, it isn't a 90's petrol engine. You'll just make more noise and belch toxic fumes as well as permanently putting the dash warning light on.

 

Just get it remapped for instant results.

You'll have to have the DPF mapped out. A remap can make use of a DPF delete due to having a less restricted exhaust.

 

This is, however, illegal to do. Well technically legal but then illegal to drive on the road.

A DPF is only really restrictive when it gets clogged, if your EGR is in good condition and you don't use the car as a shopping trolley then it never gets clogged.

 

If the turbo is giving you peak boost then there's no restriction, you can't make any more power without more boost and more fuel to go with that extra air.

 

Once again, it isn't a 90's petrol turbo so the crude tuning tricks used on those really won't help.

The DPF is pretty restrictive. Removing it allows the turbo to spool quicker.

 

But either way having the DPF removed requires a remap too.

 

Removing it without the ECU tweaks will cause warning lights, black smoke, failed regens and eventually engine failure (due to diesel getting into the oil).

Also consider that the DPF was designed into the engine from the start, so the turbo will have been sized with that in mind and won't have much overhead to improve if the DPF is removed.

1 hour ago, sepulchrave said:

A DPF is only really restrictive when it gets clogged, if your EGR is in good condition and you don't use the car as a shopping trolley then it never gets clogged.

 

If the turbo is giving you peak boost then there's no restriction, you can't make any more power without more boost and more fuel to go with that extra air.

 

Once again, it isn't a 90's petrol turbo so the crude tuning tricks used on those really won't help.

Wrong 

25 minutes ago, chimaera said:

Also consider that the DPF was designed into the engine from the start, so the turbo will have been sized with that in mind and won't have much overhead to improve if the DPF is removed.

Turbo limit is 150 dpf 175-180

20 minutes ago, AMD87 said:

Wrong 

 

Which bit?

34 minutes ago, sepulchrave said:

 

Which bit?

Pretty much your full first paragraph. 

Lot of useful bits of information here.

I haven't gotten a remap on my car (been dragging my feet as I wanted to save that money incase I needed to fix anything for Nct).

 I hope to get 150 hp out of my car for now and keep it at that power for atleast a year or two ,so I likely wouldnt have to delete the dpf out of concern for it being messed up by (presumably) higher egt's.

If I can keep it installed without worrying about it clogging up (which it shouldn't do with my driving) that would be great,But I know quite a few people with newer diesels where the dpf has proven to be the achilles heel to an otherwise completely reliable car, and its not typically due to operator error.

I'm still 50/50 on keeping it in or not, if I can just get the regen mapped out and the egr turned way back that would suit me fine (for now.)

 

 

24 minutes ago, DieselMonte said:

Lot of useful bits of information here.

I haven't gotten a remap on my car (been dragging my feet as I wanted to save that money incase I needed to fix anything for Nct).

 I hope to get 150 hp out of my car for now and keep it at that power for atleast a year or two ,so I likely wouldnt have to delete the dpf out of concern for it being messed up by (presumably) higher egt's.

If I can keep it installed without worrying about it clogging up (which it shouldn't do with my driving) that would be great,But I know quite a few people with newer diesels where the dpf has proven to be the achilles heel to an otherwise completely reliable car, and its not typically due to operator error.

I'm still 50/50 on keeping it in or not, if I can just get the regen mapped out and the egr turned way back that would suit me fine (for now.)

 

 

No point in keeping the dpf but turning off the regen as it won’t clean it. 

8 hours ago, AMD87 said:

Pretty much your full first paragraph. 

 

So you're saying the DPF is restrictive on the one hand but then...

 

9 hours ago, AMD87 said:

Turbo limit is 150 dpf 175-180

 

Which strongly suggests the DPF is in fact not restrictive.

 

So I guess you're just being contrarian?

 

The OP needs to understand that being filthy and smelly like an old tech oil burner does not make a CR diesel faster so he should not remove the emissions control equipment because some moron told him otherwise.

3 minutes ago, sepulchrave said:

 

So you're saying the DPF is restrictive on the one hand but then...

 

 

Which strongly suggests the DPF is in fact not restrictive.

 

So I guess you're just being contrarian?

 

The OP needs to understand that being filthy and smelly like an old tech oil burner does not make a CR diesel faster so he should not remove the emissions control equipment because some moron told him otherwise.

it’s still a restriction and you needed a better mapper if you think they will be filthy. And they are restrictive the fact you’re flat out saying they aren’t is wrong. 
 

Although tailgaters love them 

Edited 17 July, 20205 yr by AMD87

2 hours ago, AMD87 said:

it’s still a restriction and you needed a better mapper if you think they will be filthy. And they are restrictive the fact you’re flat out saying they aren’t is wrong. 
 

Although tailgaters love them 

 

It's only restrictive if it limits the engine, so you're saying with a standard turbo the engine will make 150 with or without the DPF, which is exactly what I'm saying, how are you missing the logic exactly or are you really just looking for an argument?

 

As far as I'm concerned we agree, end of story.

 

The OP doesn't need to mod anything to get the maximum power from his car, just get a good remap.

 

Poverty tuning on modern cars doesn't do anything good, the fines for using non-emissions compliant vehicles in low emission zones are so large it simply isn't worth risking.

8 minutes ago, sepulchrave said:

 

It's only restrictive if it limits the engine, so you're saying with a standard turbo the engine will make 150 with or without the DPF, which is exactly what I'm saying, how are you missing the logic exactly or are you really just looking for an argument?

 

As far as I'm concerned we agree, end of story.

 

The OP doesn't need to mod anything to get the maximum power from his car, just get a good remap.

 

Poverty tuning on modern cars doesn't do anything good, the fines for using non-emissions compliant vehicles in low emission zones are so large it simply isn't worth risking.

How is it poverty tuning 😂 and that’s on the assumption they are allowed in low emissions zones anyway. 
 

loads of us have tested these parts way past their limits and know what we are talking about  

4 minutes ago, AMD87 said:

How is it poverty tuning 😂 and that’s on the assumption they are allowed in low emissions zones anyway. 
 

loads of us have tested these parts way past their limits and know what we are talking about  

 

Some of us have worked in the tuning trade for years and really know what we're talking about 😉

 

Stick to the driving and keep writing those cheques.

1 hour ago, sepulchrave said:

 

Some of us have worked in the tuning trade for years and really know what we're talking about 😉

 

Stick to the driving and keep writing those cheques.

Not very well it seems. 

12 hours ago, AMD87 said:

No point in keeping the dpf but turning off the regen as it won’t clean it. 

Good point I did post that at 1am so I wasnt able to make any sort of decent argument.

 

2 hours ago, sepulchrave said:

 

It's only restrictive if it limits the engine, so you're saying with a standard turbo the engine will make 150 with or without the DPF, which is exactly what I'm saying, how are you missing the logic exactly or are you really just looking for an argument?

 

As far as I'm concerned we agree, end of story.

 

The OP doesn't need to mod anything to get the maximum power from his car, just get a good remap.

 

Poverty tuning on modern cars doesn't do anything good, the fines for using non-emissions compliant vehicles in low emission zones are so large it simply isn't worth risking.

I dont have any low emissions zones near me. I'm not worried about fines or anything as its unlikely I would find myself in the situation where that stuff would be checked.

 

So long as I'm not rolling coal everywhere no one would bother to check if a dpf is installed we dont really have low emissions zones in Ireland so That wouldnt matter anyway.

Its moreso removing it to prevent it clogging and causing trouble rather than gutting it to make way for maximum power. I'm not concerned with a little bit of smoke nor a bit of a sulphur smell at idle.

Both sepulchrave and Amd have valid points, as I believe I have said before,I have time to make a decision either way so I can see whether the dpf starts causing trouble. In which case that thing is getting ripped out. If not, i'll have to consider things as they sit.

I may be wide of the mark but I know SOME dpf's can kind of be emptied out, without opening the canister. You kind of "Knock the middle bit out, after removing it, then re-install the empty-ish unit and have the system deleted, electronically. (All layman terms).

It is almost impossible to know its been done, will pass an MOT as there is no external tampering, as long as the engine is not running on sloppy, cheap  diesel. (Cataclean or similar, prior to MOT will help). I am not suggesting this WILL work or if its legal, but I have known it to work and pass MOT's on someones car.

 

This will cost around the same price as a forced regen. Or so I am led to believe. 

1 hour ago, mrgf said:

I may be wide of the mark but I know SOME dpf's can kind of be emptied out, without opening the canister. You kind of "Knock the middle bit out, after removing it, then re-install the empty-ish unit and have the system deleted, electronically. (All layman terms).

It is almost impossible to know its been done, will pass an MOT as there is no external tampering, as long as the engine is not running on sloppy, cheap  diesel. (Cataclean or similar, prior to MOT will help). I am not suggesting this WILL work or if its legal, but I have known it to work and pass MOT's on someones car.

 

This will cost around the same price as a forced regen. Or so I am led to believe. 

This is one way I have heard of doing it. I didn't know whether it was a word of mouth thing or if it actually worked. I heard of drilling out a certain size hole to bypass it but I can't remember what size off the top of my head.

The guy I know someone had it done from, said they use a tube, like a scaffold pole or something that fits inside, like a trolley back handle. I bet they keep hold of the precious metal, on top of the cost but hey- it won't block up again and only chuffs smoke on cheap fuel, on harder acceleration! Three MOT's later, still doing its job.

My previous car (the Saab 1.9 twin turbo) had a DPF delete. The DPF was basically bashed out and left in place so it still looked intact.

 

Stage 1 remap sees about 220 bhp. With a DPF delete that was pushed to 250 bhp (and 500nm of torque).

 

So on that particular engine the DPF did cause a restriction but then a completely different engine with twin sequential turbos.

1 hour ago, mrgf said:

The guy I know someone had it done from, said they use a tube, like a scaffold pole or something that fits inside, like a trolley back handle. I bet they keep hold of the precious metal, on top of the cost but hey- it won't block up again and only chuffs smoke on cheap fuel, on harder acceleration! Three MOT's later, still doing its job.

This might be the way to go for me then, sort of the "best of two worlds" 

 

5 minutes ago, Phil-E said:

My previous car (the Saab 1.9 twin turbo) had a DPF delete. The DPF was basically bashed out and left in place so it still looked intact.

 

Stage 1 remap sees about 220 bhp. With a DPF delete that was pushed to 250 bhp (and 500nm of torque).

 

So on that particular engine the DPF did cause a restriction but then a completely different engine with twin sequential turbos.

I figure thats how most dpf deletes get done around here,either that or a straight pipe.

I assume you mean "Thats the way to go for someone you know"!

 

The deleter (If thats a word) on doing the work, also upped the BHP a modest 10, from 80 to 90. Ok for a modest 1.4, where the non dpf model was listed at 70BHP to start with.