Right

Following on from my thread 18 months ago http://www.briskoda.net/forums/superb/superb-2-0-140-bhp-dont-buy-one/63888/ The car is nearing 60,000 miles so coming out of warranty.

Its now time to gather thoughts on how to dispense with the DPF

The purpose of this thread is two fold

Firstly has anyone found the elusive fix

Secondly who else wants theres removed, I am talking to one company about them trying to do the deed but I need to gauge what interest there is to help them decide how much time to spend trying to do it.

Im looking at removing the filter & replacing it with a blank pipe, a few tweaks to convince the car its still there & then a remap to get some oomph back into the car but more importantly get the mpg up to something more in line with the old 1.9diesel Superbs

IF YOUR CARS still in warranty I suggest you PM me as the Milton Keynes Secret Police do trawl around here from time to time

Stuart, I would be interested in the details of the proposed DPF modifications planned. The "old" Superb will shortly become an absolute bargain basement when the new one arrives and it has the advantage of having the 8V head (the VAG diesels with 16V heads are not engines of my choice).

I have had occasion to tow my own trailer with a 140PS 2.0 (VW) diesel. It's nowhere near as good as the 1.9 and in comparison, seriously lacks low speed grunt. I didn't check the fuel consumption but my 1.9 is really good when unhitched.

I take your point about the M-K Gestapo; please send me a PM when you have details.

rotodiesel.

I've been up to my neck in things, but I still think sending a false signal would work just fine.

Does anyone have any idea of the values expected at certain RPM. I remember there being a difference to show a clear filter so what that is I don't know. Also is it sent down a simple voltage line or something more complex?

I'm thinking just install a piggy back into the connector like a resistor mod that would always send the clear signal.

I've been up to my neck in things, but I still think sending a false signal would work just fine.

Does anyone have any idea of the values expected at certain RPM. I remember there being a difference to show a clear filter so what that is I don't know. Also is it sent down a simple voltage line or something more complex?

I'm thinking just install a piggy back into the connector like a resistor mod that would always send the clear signal.

SUK know the values & the ecu can be reprogrammed using the 5051 tool or whatever its called, they just arent allowed to divulge them, if they did so they are aiding someone to break emission laws I guess.

I dont think its related to RPM, The G450 pressure sensor simply measures the difference in pressure befor & after the filter & when its too great it indicates a blocked filter & the cars ecu starts to add fuel or strat regeneration. The fristrating thing is there has to be a difference, with no difference it assumes the 450 has failed & puts the car into limp.

It also takes readings from the G506 temp sensor in front of the DPF & the G70 Air mass metre to determine the state of the DPF

The loading conditionof the filter can be read using the 5051 or v5052 tool in a measured value block giving percentage full, is this a way of reading how full it is whist measuring the signal given off by the G450 sensor & then repricating the signal for an empty filter ??

These are all bits extracted from the Skoda "book of the DPF" so its obviously not that simple & I dont profess to understand it. Probably best you have another read of the book at some point but I am certain that electronically it can be sorted

Stuart, you have PM

hi guys

whats the update on your endevour to remove the dpf ?

i have a passat 170 dpf with some issues also.

im aware that milltek do a dpf removal pipe for the golf.

hi guys

whats the update on your endevour to remove the dpf ?

i have a passat 170 dpf with some issues also.

im aware that milltek do a dpf removal pipe for the golf.

Miltek have no intetion of doing anything for the Superb, to small a market to justify development costs. Worth you talking to them about the Passat though as a first port of call. I would have thought with any change a remap is neccesary to get the best out of the car.

I have had an offer from a good mapper to have a go at remapping the Superb once the DPF is removed. I cant find a s/hand dpf anywhere to knock the centre out of & use to fill the gap where the DPF used to go so it means getting a bespoke pipe made up, then as I believe the car wont run without it in its stock mode I will then be left to trailer it around. The cars already done 65000 & might be sold next year if the car we have ordered is as good as the press are reporting so its a big outlay & a lot of hassle for a few months & wont raise the resale value. If the car ordered isnt what we are lead to believe or the price when announced is to high then we will keep the Superb & work on loosing the DPF.

SUK know the values & the ecu can be reprogrammed using the 5051 tool or whatever its called, they just arent allowed to divulge them, if they did so they are aiding someone to break emission laws I guess.

I dont think its related to RPM, The G450 pressure sensor simply measures the difference in pressure befor & after the filter & when its too great it indicates a blocked filter & the cars ecu starts to add fuel or strat regeneration. The fristrating thing is there has to be a difference, with no difference it assumes the 450 has failed & puts the car into limp.

It also takes readings from the G506 temp sensor in front of the DPF & the G70 Air mass metre to determine the state of the DPF

The loading conditionof the filter can be read using the 5051 or v5052 tool in a measured value block giving percentage full, is this a way of reading how full it is whist measuring the signal given off by the G450 sensor & then repricating the signal for an empty filter ??

These are all bits extracted from the Skoda "book of the DPF" so its obviously not that simple & I dont profess to understand it. Probably best you have another read of the book at some point but I am certain that electronically it can be sorted

Based on this, it looks to me like there could be a reasonably simple fix once the DPF's physically gone.

You state that there must be a difference between the two pressure sensors - i.e. before and after the DPF.

Technically then, if you "piggybacked" the signal from the first sensor, changed it (either voltage or current, depending on the system, using resistors/potential dividers/digital logic) and then fed it to the sensor afterward, this could trick the ECU into thinking it's clear as you state.

I'd be happy to have a bash at the electronics if someone can provide the figures - and what's this DPF book you speak of?

Obviously - I don't have the issue of a DPF (yay AWX ) but it looks like if I buy a newer "old" Superb (or other VAG for that matter) than I might not have a choice.

SUK know the values & the ecu can be reprogrammed using the 5051 tool or whatever its called, they just arent allowed to divulge them, if they did so they are aiding someone to break emission laws I guess.

Another thing...

I think this might be right on the money - the Fabia VRS (BLT engine) has a problem with hesitation as many of you know, and the fix involves changing a washer on the EGR valve.

I understand that Skoda won't do this - as it changes the engine emissions from Euro IV to Euro III.

Perhaps the reprogramming of the ECU re DPF would be the same kettle of fish.

Ok after reading through 12 pages of fragmented information on the DPF I've got an idea what you chaps are on about.

I may possibly know someone who'll have some extra info on this. Hopefully the values the sensors kick back to the ecu .... we'll see.

Out of curiosity, does anyone have a definitive answer as to which engines/years of Superbs this affects?

Edited 23 October, 200817 yr by allclownsareevi

Based on this, it looks to me like there could be a reasonably simple fix once the DPF's physically gone.

You state that there must be a difference between the two pressure sensors - i.e. before and after the DPF.

Technically then, if you "piggybacked" the signal from the first sensor, changed it (either voltage or current, depending on the system, using resistors/potential dividers/digital logic) and then fed it to the sensor afterward, this could trick the ECU into thinking it's clear as you state.

I'd be happy to have a bash at the electronics if someone can provide the figures - and what's this DPF book you speak of?

Obviously - I don't have the issue of a DPF (yay AWX ) but it looks like if I buy a newer "old" Superb (or other VAG for that matter) than I might not have a choice.

Ive been told the following.

The car does a series of checks in the split second when you switch the ignition on before you start. at that point there is no pressure difference. If that reading is not detected it assumes a DPF malfunction & stickes into limp mode. As I said Ive only been told that but it came from a respected VAG tuner. If you haver a box of tricks in place it will be giving a reading.

The hardest thing is also to find what the reading for a perfectly functioning dpf is. If that figure is known it will make things a lot easier & eliminate trial & error.

The connectors into the pressure measuring valve are virtually on tyop of the Engine at the rear so dont go looking under the car.

The book I refer to is the Self Study programme No 60 that Skoda tecnicians are given. 47 pages of A4 to explian the DPF, you can see its not that simple !!

The best way IMO is to take it out & then get an expert to remap it. Another alternative, I believe the superb was sold in some Eastern European markets without the DPF. A copy of the map from that car would be worth investigating .

Stuart, (off topic) reading you post has got me intrigued, what new car have you ordered?

Stuart, (off topic) reading you post has got me intrigued, what new car have you ordered?

The Superb is Wendys. Now shes not doing intergalactic miles she can have something thats a bit more fun. Its not from the VAG group thats all Im prepared to add in case it dosent come off.

The Superb is Wendys. Now shes not doing intergalactic miles she can have something thats a bit more fun. Its not from the VAG group thats all Im prepared to add in case it dosent come off.

Hmm...

You've not been reading Neo's project thread have you...? :P

Hmm...

You've not been reading Neo's project thread have you...? :P

Nope, post a link

Nope, post a link

http://briskoda.net/briskoda-members-cars/neo_vrs-mazda-mps/117609/

http://briskoda.net/briskoda-members-cars/neo_vrs-mazda-mps/117609/

No not one of those.

No not one of those.

Hmm.

Now I'm intrigued...

Hmm.

Now I'm intrigued...

Ok no point running a guessing thread, had enough of Des's.

Its a Fiat 500 Abarth, we have one of the first reserved but rumour control is saying the first 200 will come with no options so I think we might let the option go & wait to see what follows.

Ok no point running a guessing thread, had enough of Des's.

Its a Fiat 500 Abarth, we have one of the first reserved but rumour control is saying the first 200 will come with no options so I think we might let the option go & wait to see what follows.

500 Abarth? An interesting choice, it's certainly unusual.

I hate to admit it but there is something about that little 500...

500 Abarth? An interesting choice, it's certainly unusual.

I hate to admit it but there is something about that little 500...

Tis a bit special, Weve only seen one that was a l/hand drive pre production but it looks a winner

Ive been told the following.

The car does a series of checks in the split second when you switch the ignition on before you start. at that point there is no pressure difference. If that reading is not detected it assumes a DPF malfunction & stickes into limp mode. As I said Ive only been told that but it came from a respected VAG tuner. If you haver a box of tricks in place it will be giving a reading.

The hardest thing is also to find what the reading for a perfectly functioning dpf is. If that figure is known it will make things a lot easier & eliminate trial & error.

The connectors into the pressure measuring valve are virtually on tyop of the Engine at the rear so dont go looking under the car.

The book I refer to is the Self Study programme No 60 that Skoda tecnicians are given. 47 pages of A4 to explian the DPF, you can see its not that simple !!

The best way IMO is to take it out & then get an expert to remap it. Another alternative, I believe the superb was sold in some Eastern European markets without the DPF. A copy of the map from that car would be worth investigating .

By ignition on, do you mean before you fire up the starter?

If so why not just make a straight through pipe with a box on the side that you can connect the appropriate sensor into.

Surely they can take the DPF off and just pressure test the in and out pressure then make a small baffled holder for the sensor and some short pipes to connect it to and tune it to that pressure.

If you did that, the pressure/flow relationship would be wrong over the speed range and the ECU would detect it. The difficulty with this problem is that if you remove the DPF and replace it with any kind of constriction with the same pressure/flow characteristic as the DPF, it will get blocked with soot - unless it's phsically a lot bigger. Then it won't fit the space.

This design is just a big **** up.

rotodiesel.

I was just meaning you could have it there external to the exhaust, then take it out of circuit after the car had done the checks.

Really does look likes it's a box of electronic tricks.

If somebody can log the data with vag come, i'd be fairly certain I could make a box of tricks up to reproduce the data.

I was just meaning you could have it there external to the exhaust, then take it out of circuit after the car had done the checks.

Really does look likes it's a box of electronic tricks.

If somebody can log the data with vag come, i'd be fairly certain I could make a box of tricks up to reproduce the data.

I dont think you can do it with vag com. what you need to do is to piggy back wires onto the output from the pressure sensor to establish the readings being sent to the ecu. then recreate that signal. hard bit is knowing when the dpf is running at its max effficency & giving the lowest reading. making the box of tricks is easy from there on. You just have to fool the car when its started. I think it will take time & a reosnable investment to sort it out. Best route is still I think to get the car to a good mapper & let them loose on it but at present I dont have the time or money to do that.