turbo diesels - particulates and silencers ?

[twoblacklines]

Im thinking of mufflerectormy, this is where you weld straight 2.5 - 3" pipe from the exhaust manifold all the way to the back of the car. This gets rid of alot of turbo lag, and you get to hear the turbo aswell. http://www.youtube.com/watch?v=_sUew...eature=related Now this is good but its loud and ofcourse lots of smoke is produced. So i have a question : do exhaust silencers (like a middle box) and diesel particulate filters (that get rid of smoke) affect performance and turbo lag ? This way i could make a smoke-free quiet exhaust system, but retain the less-lag performance. Im doing all this before i chip the car, i have a BMC CDA kit to go on aswell. This is for my daily, a passat PD130. thankyou.

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[twoblacklines]

BUMP

[mechanic28]

having all the extra boxes does not help power or help the turbo spin up!however if you got a particular filter and you remove it your management system will not like it too much!you might also have to put a different turbo on it etc

[Shorty]

Dont worry there will not be any sensors in the exhaust so you could complete remove the exhaust and the car would not flash up any lights.

Why not just have a straight through pipe with a back box then? Basically just decatting the car. Thats what i am about to do with my car, got a full turbo back Milltek exhaust with no cat in it.

[timrud]

If you have a car with a DPF, like the 170bhp Golf, they are a bit funny about been remapped I think?

[twoblacklines]

What im trying to ask is instead of just straight pipe I WANT the DPF in the system along with a silencer. I dont want a loud smokey diesel car. However if it hinders performance im prepared to lose them.

They are fine with being remapped.

[as355f1]

Originally Posted by Shorty

Dont worry there will not be any sensors in the exhaust so you could complete remove the exhaust and the car would not flash up any lights.

Why not just have a straight through pipe with a back box then? Basically just decatting the car. Thats what i am about to do with my car, got a full turbo back Milltek exhaust with no cat in it.

??? so what about the o2 sensors and the DPF Sensors

[Shorty]

What year is your Passat?

[timrud]

I have heard a few stories about 170's literally going up in flames after a remap. Obviously the lower power cars don't suffer the same way as it is a different setup..

[jammerrs]

silensers will loose performane, they restrict the exhaust flow which is why they quiten it down.

id just have a back box, the filter and cat, 2.5" pipe work.

you could ditch it all i beleive but itd be a loud, and youd get pulled alot for it with the noise

[mechanic28]

its not as easy just too lose a particular filter!

[jammy86]

and its a diesel... who the f**k wants a loud diesel?

What age is the car?

JAmes.

[James90RS]

Originally Posted by Shorty

Dont worry there will not be any sensors in the exhaust so you could complete remove the exhaust and the car would not flash up any lights.

Why not just have a straight through pipe with a back box then? Basically just decatting the car. Thats what i am about to do with my car, got a full turbo back Milltek exhaust with no cat in it.

So how does the car know when the DPF is full and when to regen it then?

[GUZZLER]

Jamsport have a lot of files suitable for removing DPF's now

[JAMSPORT]

Originally Posted by Shorty

Dont worry there will not be any sensors in the exhaust so you could complete remove the exhaust and the car would not flash up any lights.

Why not just have a straight through pipe with a back box then? Basically just decatting the car. Thats what i am about to do with my car, got a full turbo back Milltek exhaust with no cat in it.

if the car has DPF fitted then there are a few sensors fitted into the DPF itself pressure etc.
when we remove the DPF we refit all the sensors into the exhaust like you would with lambda sensors when decatting a car.

There have been one or two stories about remapped dpf cars setting on fire etc, this was the case when people were pushing too much power thru the dpf fitted cars ,they then blocked up and over heated. we have remapped many cars with the dpf still fitted and not had a problem

[James90RS]

Originally Posted by JAMSPORT

if the car has DPF fitted then there are a few sensors fitted into the DPF itself pressure etc.
when we remove the DPF we refit all the sensors into the exhaust like you would with lambda sensors when decatting a car.

There have been one or two stories about remapped dpf cars setting on fire etc, this was the case when people were pushing too much power thru the dpf fitted cars ,they then blocked up and over heated. we have remapped many cars with the dpf still fitted and not had a problem

If it's to be done, that's the way to do it, ensuring all sensors go back into the exhaust. Although the management systems may detect the DPF is not there, by the readings of the sensors!


Over heating the DPF will cause the brick inside to crack, and then hence block but it has to get pretty hot to do this - so much so I'd say that any car that does this with a remap, has not been remapped well...

[mozzy]

Originally Posted by twoblacklines

Im thinking of mufflerectormy, this is where you weld straight 2.5 - 3" pipe from the exhaust manifold all the way to the back of the car. This gets rid of alot of turbo lag, and you get to hear the turbo aswell.

Now this is good but its loud and ofcourse lots of smoke is produced.

So i have a question : do exhaust silencers (like a middle box) and diesel particulate filters (that get rid of smoke) affect performance and turbo lag ? This way i could make a smoke-free quiet exhaust system, but retain the less-lag performance. Im doing all this before i chip the car, i have a BMC CDA kit to go on aswell.

This is for my daily, a passat PD130.

thankyou.

a friend did this to his golf and it was gutless as hell, something to do with turbo diesels needing back pressure (he4 removed every box inc cat and had a straight through pipe), it was a golf gt tdi 150.

my citroen c4 vts 2.0 hdi i used to have had been remapped and within a month the dpf needed replacing, one morning the obc said dpf fluid low (still had 3/4 of a bottle of fluid left), next morning it would not start, the dpf had melted and the dpf ecu was fubbered, not sure if the remap caused it or not though but i know Ł780 later it was ok again but occasionly when driving at one set speed on the motorway for a prolonged time it would start feeling a bit lifeless (had 169 bhp and 262 lb/ft) then when you dropped a gear and floored it ridicolous amounts of soot and smoke would pourfrom the back then it would be ok again, the dpf was clogging so i was told, again not sure if this was due to the remap but before that it was fine, could maybe just be down to the fact it was a citroen lol

[AlexF]

Mozzy - who did your remap?

[JAMSPORT]

Originally Posted by James90RS

If it's to be done, that's the way to do it, ensuring all sensors go back into the exhaust. Although the management systems may detect the DPF is not there, by the readings of the sensors!


Over heating the DPF will cause the brick inside to crack, and then hence block but it has to get pretty hot to do this - so much so I'd say that any car that does this with a remap, has not been remapped well...

the management will detect no DPF, you need to alter the map to effictivly turn the DPF off if you like.

[mozzy]

http://www.southwestincartech.co.uk/...FSGElAod8WkQYQ

just noticed they are doing dpf removal and decoding now

[bouncy]

Originally Posted by JAMSPORT

if the car has DPF fitted then there are a few sensors fitted into the DPF itself pressure etc.
when we remove the DPF we refit all the sensors into the exhaust like you would with lambda sensors when decatting a car.

There have been one or two stories about remapped dpf cars setting on fire etc, this was the case when people were pushing too much power thru the dpf fitted cars ,they then blocked up and over heated. we have remapped many cars with the dpf still fitted and not had a problem

Interesting, do any of the cars you tune run addative ecu's. If so how do you get around the extra ecus when used through say a Muliplex system which uses can and van protocols.

Presumably the German stuff only runs Can !!!

[PeterRST]

Important thing is that a DPF car has to be mapped very carefully. If it runs too rich, the filter will be full in no-time.

So you can't say I want the filter to avoid smoking out of the exhaust as that's not really what it's there for. They only work when the car burns its fuel reasonably clean in the first place.

[xrsi]

Originally Posted by Shorty

Dont worry there will not be any sensors in the exhaust so you could complete remove the exhaust and the car would not flash up any lights.

Why not just have a straight through pipe with a back box then? Basically just decatting the car. Thats what i am about to do with my car, got a full turbo back Milltek exhaust with no cat in it.

WRONG!!!!

TDi's have a few sensors in the exhaust if they have the particulate filter.

normally you have a pair of pressure take off either side of the filter also to go to a pressure differntial sensor to tell the management that the filter is blocked etc.

[Stu @ M Developments]

DPF's are very commonly blocked when remapping is done by people who have all the gear but no idea... take care out there folks.

[AlexF]

I've remapped LOADS of DPF equipped cars and not a problem so far (touch wood!)

[Shorty]

Originally Posted by xrsi

WRONG!!!!

TDi's have a few sensors in the exhaust if they have the particulate filter.

normally you have a pair of pressure take off either side of the filter also to go to a pressure differntial sensor to tell the management that the filter is blocked etc.

WRONG!!

DPF's only came out on later cars, as the guy said in the first post, he has a Passat TDI, so i am guessing upto 2005? Therefore will not have a DPF.

The 1.9 TDI engines that came in MK4 Golfs/Boras etc etc dont have any sensors in the exhaust, well my car hasnt as i looked into this before ordering my Milltek.

http://i901.photobucket.com/albums/ac218/ant130/002.jpg

Standard exhaust on the left, see any sensors? Nope. This is the type of exhaust Mr Passat will have on his car, so doesnt have to worry about DPF's.

[mozzy]

Originally Posted by Shorty

WRONG!!

DPF's only came out on later cars, as the guy said in the first post, he has a Passat TDI, so i am guessing upto 2005? Therefore will not have a DPF.

The 1.9 TDI engines that came in MK4 Golfs/Boras etc etc dont have any sensors in the exhaust, well my car hasnt as i looked into this before ordering my Milltek.

http://i901.photobucket.com/albums/ac218/ant130/002.jpg

Standard exhaust on the left, see any sensors? Nope. This is the type of exhaust Mr Passat will have on his car, so doesnt have to worry about DPF's.

haha you basically just repeated what XRSI wrote, read what he wrote again then recomment cause you said basically the same thing which must mean if he is wrong then so are you.


on a different note i am guessing thye guy that mapped mine did a poor job cause although it went like stink the dpf clogged all the time, a good hammering cleared it out again but never lasted long, this was on a 2.0 16v psa hdi though not a pd.

i know when i had a golf tdi 170 courtesy car from helphire which had 1200 miles so basically brand new it was constantly saying dpf fault on the obc

[Shorty]

Ooooopppssss!

"...in the exhaust if they have the particulate filter..."



I was right in what i first said though....