I've been searching through the forums to try and get some clarity on the potential benefits of DPF removal on the CR170 engine.

I've found plenty of stuff on the PD170, and clearly its removal is a winner with more power/torque, better fuel consumption and no more DPF issues....

...but what about the CR170 engine?

anyone got a definitive answer on this point?

many thanks in advance

If youre going to stage 1 remap id say dont bother; power gains only 10-15hp over having it in place. Id say DPF removal will become an MOT grey area too as it contributes greatly to the cars emission output.

If youre going to stage 1 remap id say dont bother; power gains only 10-15hp over having it in place. Id say DPF removal will become an MOT grey area too as it contributes greatly to the cars emission output.

Was thinking about picking up a used one (ebay etc) and gutting it, rather than removing and replacing with a piece of pipe,

but yes, will be remapping - is there such thing as 'stage 2' remap on the CR ? thought stage 1 (plus DPF gutting) was a far as you could go (without changing turbo's etc)

If youre going to stage 1 remap id say dont bother; power gains only 10-15hp over having it in place. Id say DPF removal will become an MOT grey area too as it contributes greatly to the cars emission output.

With regard to the MOT I think it's only a visual check to make sure the filter is in place. There's nothing to say there has to be anything inside it.

Provided the emissions are within the limits i don't think it will be an issue.

Was thinking about picking up a used one (ebay etc) and gutting it, rather than removing and replacing with a piece of pipe,

but yes, will be remapping - is there such thing as 'stage 2' remap on the CR ? thought stage 1 (plus DPF gutting) was a far as you could go (without changing turbo's etc)

We've done a handful of Stage 2 CR170s. Results on our dyno are around 215bhp and I believe one of them dyno'd at ~240 elsewhere.

If youre going to stage 1 remap id say dont bother; power gains only 10-15hp over having it in place. Id say DPF removal will become an MOT grey area too as it contributes greatly to the cars emission output.

Don't see how it 'greatly reduces emissions' - all its does is hold the soot in until your on a motorway or A road and pumps it out there! Its not reducing it, just saving it all up.

Having a DPF is what put me off buying the Octavia vRS with a diesel engine.. with the cost it takes to remove and remap its the difference in running costs for the TFSI that is a lot more reliable unit....

Don't diesels only get a soot test and not an emission test??

Mine went thru 2 MOTs whilst I had it without issues (one was an initial fail due to my partners slow driving and too much soot flew out when the tester floored it, all sorted after a spirited drive) and they only look for the presence of the DPF not what is inside it.

many thanks for all the input,

regarding soot, the MOT position etc that's all covered in detail in many threads on here - so happy with my understanding of all that.

Also, it's clear that the PD VRS benefits significantly from DPF removal/gutting but I struggled to find anything really conclusive on the CR engine.

Having said all that, I've just spoken to my insurers and told them of all the mod's I intend to make to the car I've just bought and they have noted/charged me for them now (actually no change in premium over the car I've just sold)..... All I need to do is call them when each mod is done (no extra charge - just so their records reflect the current state of modification) ......... I've include DPF delete/gutting and remap in the 'list' of modifications

I'm not looking for the fastest Vrs on the road (been there already with the 330bhp K04 car I had for a while) so I'm really not interested in the petrol vs derv vrs debate - it's obvious a heavily modded petrol will be faster! I want good reliable power, flexibility via good torque output and the ability for the car to be reasonably economical without having to drive everywhere at 60 mph on the motorway.

We've done a handful of Stage 2 CR170s. Results on our dyno are around 215bhp and I believe one of them dyno'd at ~240 elsewhere.

So apart from the obvious extra 10-15bhp over a remap alone, does losing the DPF on the CR engine give better turbo response, improved torque and better Mpg?

many thanks.

Don't see how it 'greatly reduces emissions' - all its does is hold the soot in until your on a motorway or A road and pumps it out there!

No it doesn't! It burns it - converts it to CO2

Gents, there's already loads of threads on here about the merits of DPF's, what they do, how they work ect, etc.

I'd like to try and keep this thread on the topic of whether there's any real benefit of losing the DPF on the CR170 engine specifically.

many thanks

Gents, there's already loads of threads on here about the merits of DPF's, what they do, how they work ect, etc.

I'd like to try and keep this thread on the topic of whether there's any real benefit of losing the DPF on the CR170 engine specifically.

many thanks

regens with a dpf use extra fuel to burn off the soot, so losing the dpf will stop this and save fuel

The CR170 was designed to run with a DPF. The DPF on the DR170 is different to the one on the PD170 in that it includes a catalyst to get it hotter quicker and keep it hotter for longer.

This allows the CR170 to perform passive regens much easier therefore significantly reducing the number of active regens.

In short the CR170 suffers much less DPF issues and as most owners have reported on here is barely if ever noticeable.

I'd leave it as is.

The CR170 was designed to run with a DPF. The DPF on the DR170 is different to the one on the PD170 in that it includes a catalyst to get it hotter quicker and keep it hotter for longer.

This allows the CR170 to perform passive regens much easier therefore significantly reducing the number of active regens.

In short the CR170 suffers much less DPF issues and as most owners have reported on here is barely if ever noticeable.

I'd leave it as is.

Ok,

I understand where you're coming from but, just playing devils advocate for a minute, if the cost of gutting the DPF and the subsequent remap was only marginally different would it be worth it for the extra power, potentially faster turbo spool due to less restrictive exhaust flow and a meatier sounding exhaust (if you like that kind of thing?)

Also, no active regens would surely save some fuel over 3 or 4 years?, which is how long I intend to keep the car. Gutting the DPF makes no difference to my insurance costs compared to just a remap (I've checked).

Thanks for the input

The DPF is bound to restrict the engine in some shape or form as it reduces the flow through the exhaust.

If the car is a keeper then I'd see why you'd want to remove it whilst the car is in for a remap.

One other point, I'm sure the CR170 is better but the PD170 can smoke a bit after DPF removal.

My DPF is playing up a bit and I'm still reluctant to remove it for this reason alone. I reckon my vRS might be a bit of a smoker.

The CR170 was designed to run with a DPF. The DPF on the DR170 is different to the one on the PD170 in that it includes a catalyst to get it hotter quicker and keep it hotter for longer.

This allows the CR170 to perform passive regens much easier therefore significantly reducing the number of active regens.

In short the CR170 suffers much less DPF issues and as most owners have reported on here is barely if ever noticeable.

I'd leave it as is.

Spot on advice

The CR 170 rarely suffers issues that the PD engine does...I'd leave it alone

I have a remapped CR 170 (OK, it's in a Yeti but it's the same engine as the VRS) and it is good with a stage 1 remap to around 200bhp.

Have been considering the next stage, but have not followed it through as to get an extra 15-20bhp I've decided it's better to keep the DPF and have a clean running diesel.

Unless someone with a DPF removed on a CR 170 wants to give me a demonstation of how smoke free they are.

Martin,

It might be worth taking a look on the golf forums as they tend to go crazy with tuning.

After talking to shark their honest opinion was unless you're going after big power or its broken its not really worth doing.

I miss a smokey diesel but do not missed the dirty bum.

Ok, so all the evidence points to 'maybe' 5% to 7.5% more power (200bhp mapped vs 210-215 mapped less DPF) but possibly loads (or certainly more) smoke!

I think if a mapped CR' VRS suffers no DPF issues after the map, then I'll leave the DPF well alone and put up without the 'little' extra power.

This car was, after all, the sensible economy choice

60K and counting on my CR170 VRS, mapped by shark at 4 months old, don't even know its got a DPF it's so trouble free!!

tbh, I would imagine it might be worth doing if you were going for a bigger turbo, but otherwise I would just leave it in, get a better filter and a remap.

Mines gone wrong in my vRS Estate DSG 170 CR (currently approx. 210 - 220 bhp - can't keep it in gear for the rolling road).

Removing it on Friday and remapping it again.

Let you know the bhp output and how dirty it's rear gases are. It's a no brainer once it goes wrong.

£400 for the DPF delete or £1200 for a new DPF fitted - plus I'm toying with the idea of a DSG remap for launch control, fast changing, no auto changing up or down etc - it's only another £200.

Sorry environment.

Edited 13 May, 201313 yr by giblet

Its gone wrong? sure its not just a sensor? ps your DSG should already have launch control if Im not mistaken.....

Yes..launch control is a standard feature

Mine's got launch control, though I'm sure I read on one of the "mappers" website they can make the lauch control a bit more aggressive.

Would be interesting in hearing the results of the work.