Any one no what this sounds like on the 150?

Can this cause the turbo to fault? heard it could?

Alsoo any one had it done if soo how much?

Cheers

cant see how the decat can cause the turbo to fail !?

cant see how the decat can cause the turbo to fail !?

Nor can i as its releases the pressure quick than with the de cat, but he got told when he had his done (baring in mind its a skoda) that the loss of pressure build up can cause it to malfunction....
:S

any one...

on a diesel it is better known as a diesel particulate filter and works slightly different to a cat...You can remove a cat from a diesel as diesels do not have an emissions test, they have a smoke test.
Removing the cat can sometimes increase the smoke but not by a great deal, and as per a petrol car with a cat replacement pipe you would expect a slight increase in pickup etc. Dont forget unlike petrol when you floor the throttle you are not increasing the amount of fuel into the combustion chamber. Diesels do work ever so slightly different, again they are not spark ignition as petrol cars are, modern high pressure rail diesel engines start due to the heat and fuel mixture in the combustion chamber and ultra modern diesel engines no longer use glow plugs/heater plugs.

So is it going to cause an turbo failer?
Cheers mate!

Im sure on the new diesel engines they have a cat and the particle fitler fitted but haven't really took any notice before.

will not cause a turbo failure...also apparently the megane exhaust is full stainless steel acording to renault!

there is an optimum size bore for diesel exhausts if you are looking for improved tuning...

I am looking for tuning! But mainly a bit of a raw as its hard to get this on disele power!!
So any body no some where handy or what i can doo would be great!!

im having my car de-cat on tuesday mate. I herd it akes the turbo spool up quicker and does give slight proformance gains. I will let u know how i get on.

let me know im yet to get it done...

on a diesel it is better known as a diesel particulate filter and works slightly different to a cat...You can remove a cat from a diesel as diesels do not have an emissions test, they have a smoke test.
Removing the cat can sometimes increase the smoke but not by a great deal, and as per a petrol car with a cat replacement pipe you would expect a slight increase in pickup etc. Dont forget unlike petrol when you floor the throttle you are not increasing the amount of fuel into the combustion chamber. Diesels do work ever so slightly different, again they are not spark ignition as petrol cars are, modern high pressure rail diesel engines start due to the heat and fuel mixture in the combustion chamber and ultra modern diesel engines no longer use glow plugs/heater plugs.

from Wiki:


A diesel particulate filter, sometimes called a DPF, is a device designed to remove diesel particulate matter or soot from the exhaust gas of a diesel engine. Wall-flow diesel particulate filters usually remove 85% or more of the soot, and can at times (heavily loaded condition) attain soot removal efficiencies of close to 100%. A diesel-powered vehicle equipped with functioning filter will emit no visible smoke from its exhaust pipe.

In addition to collecting the particulate, a method must exist to clean the filter. Some filters are single use (disposable), while others are designed to burn off the accumulated particulate, either through the use of a catalyst (passive), or through an active technology, such as a fuel burner which heats the filter to soot combustion temperatures, through engine modifications (the engine is set to run a certain specific way when the filter load reaches a pre-determined level, either to heat the exhaust gases, or to produce high amounts of NO2, which will oxidize the particulates at relatively low temperatures), or through other methods. This is known as "filter regeneration". Sulfur in the fuel interferes with many "regeneration" strategies, so almost all jurisdictions that are interested in the reduction of particulate emissions, are also passing regulations governing fuel sulfur levels.


Well mine certainly doesn't have a DPF going buy the amount of smoke i get out of my car.

I know in the leon with DPF you get a symbol on the dash that tells you when the filter needs cleaned. which involves something like driving in 3rd gear above 50mph to burn off the soot.
So i'd assume if you have a DPF you'll have a light/thingy on the dash that indicates it. Also in the manual you'd have a section on who to drive a car with DPF as they aren't ideal for purely city driving.

Mind you because of the EU all new desiels must have one. not sure if it came in this year or if its next year. My car is an 08 plate.

i studied engine design (how to design an engine as well as how its made up/working principles) as part of my motorsport engineering degree's hence where my info is gained from, no advice in my manual ref driving with dpf!!! also no warn lamp on meggy dash for dpf issues...
Wikipedia is made up from random people who produce the threads and not all wikipedia info is factually correct!!!

the newer diesels are equipped with a fap filter and they can be a royal pain in the ass

i have been shopping around for someone to my diesel. All but everyone says there is no point u will not get any gains and its alot of money. So im going to take the experts oppinon on this one and stay clear of it. Also renault say its not a cat as such but a particular filter to stop it smoking too much and if u remove it, it will fail a m.o.t.

it wont be a particle filter as the only ones fitted with them are the newer ones(also known as fap filters)

i studied engine design (how to design an engine as well as how its made up/working principles) as part of my motorsport engineering degree's hence where my info is gained from, no advice in my manual ref driving with dpf!!! also no warn lamp on meggy dash for dpf issues...
Wikipedia is made up from random people who produce the threads and not all wikipedia info is factually correct!!!

Fair enough but FAP/DPF is new technology. So in the cars that don't have it, what is it called?

When i was looking to buy my reno i seen the exact same blurb about the 1.9 dci with fap in the brochure that i did about the Leon FR TDI. Both said you had to watch your type of driving as the filter wasn't reccomended for purely city driving.

yeah because they clog up and need 'regenerating' if you potter about town.they are made as a long journey machine that does alot of miles

My 175 defo has a DPF and there is a warning light that comes on when it's blocked. I had some problems with it after i first got it mapped. As someone else said you just give it a blast in 3rd or 4th for about 10miles at 3000revs.
Race engineer how do you no what the optimum size of bore is for a diesel exaust. Would the standard one not be the optimal size?

sorry my 2003 sport tourer had a DPF or so im told huge monster of a thing, i dont know how you differentiate tbh...!
To find optimum size for an exhaust requires a ton of algebra and other maths and depends on the engine spec, so youd have to do the math for the engine first.
As a whole though around 70mm is good for a turbo vehicle inc diesel.
No backpressure can lead to problems with the turbo (as confirmed by turbo dynamics/turbo technics when i posed them a techy question). Also heat is an enemy to diesel (due to diesels working differently), however petrol cars require heat to help produce more power hence why some competition cars have their exhausts wrapped.
I could not explain the maths for working out the exhaust as it would take to much time sorry.
I have 70mm s/stell custom on my meggy from the turbo back currently under construction.

Thanks, though i wasnt asking what the optimum size was. My point was that surly renault would have made the car with the optimum size exaust!!