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In need of some more advice guys

After a good read through the Search about De-cating a car it seems that the Turbo spools up quicker thus reducing lag and maybe a few more horses let loose?

Has anyone had good results with this? Also where would I go about buying a de-cat pipe for my 110 HDI or can I just bash the insides out with a hammer and metal bar (sounds a bit brutal!)

And..... With out a Cat would the exhaust system become louder as I like it the way it is, as in I can't hardly hear it.....long gone are the days of me wanting a roaring exhaust......think it's my age!!

Paul

The main thing that will happen when you do it is (unless your car is made before 1993 on a petrol or 1999 on a diesel, so 1.9TD or 2.1TD but not HDi) is

you will NOT pass you M.O.T

It doesn't make a huge difference and perhaps just reduces turbo lag slightly.

Here's someone who did it on a Rover and kinda raves about it....http://www.google.co.uk/url?sa=t&source ... 0smONTh9MA

tenwierdufos wrote:The main thing that will happen when you do it is (unless your car is made before 1993 on a petrol or 1999 on a diesel, so 1.9TD or 2.1TD but not HDi) is

you will NOT pass you M.O.T

Won't make any difference to the diesel mot test, the diesel test is only a smoke test.

jasper5 wrote:

tenwierdufos wrote:The main thing that will happen when you do it is (unless your car is made before 1993 on a petrol or 1999 on a diesel, so 1.9TD or 2.1TD but not HDi) is

you will NOT pass you M.O.T

Won't make any difference to the diesel mot test, the diesel test is only a smoke test.

If your car is manufactured after the above mentioned dates it does have a CO2 test, hence why your road tax is cheap (older dervs are about £200 a year thesedays) and why if you look on your v5, on the 2nd page with all the vehicle details it will say how much co2 is produced.

Like on petrols.

Now for example, if you had a d8, 1.9td, that would only have a smoke test.

I did it the other week, but we were fitting a powerflow exhaust off a V6 at the same time.

The turbo DOES spool up a LOT quicker, and i'm very impressed with the results.

I still pay the full whack road tax, not on CO2 so despite mine being a HDi I can't see how they can do anything other than a smoke test.
As it's 11 months till the next MOT, I won't be able to tell you for quite a while how I faired without it.

Cool, just a warning thats all

But as other people say, turbo will spool up faster with a decat, diesels you want no back pressure at all, unlike petrol engine.

All back pressure creates is lag.

tenwierdufos wrote:

jasper5 wrote:

tenwierdufos wrote:The main thing that will happen when you do it is (unless your car is made before 1993 on a petrol or 1999 on a diesel, so 1.9TD or 2.1TD but not HDi) is

you will NOT pass you M.O.T

Won't make any difference to the diesel mot test, the diesel test is only a smoke test.

If your car is manufactured after the above mentioned dates it does have a CO2 test, hence why your road tax is cheap (older dervs are about £200 a year thesedays) and why if you look on your v5, on the 2nd page with all the vehicle details it will say how much co2 is produced.

Like on petrols.

Now for example, if you had a d8, 1.9td, that would only have a smoke test.

It's a smoke test, the equipment used for all diesel tests is exactly the same, there are different limits, but it's the same test.

I understand the tax bracket suggestion, but from doing MOt's can tell you that the MOT's for all diesels still only test the smoke limits not co2 value, with an average reading taken form a min of 2, if the limits are far off, up to 6 odd if it is near the limits. This is the joke we always had in the workshop - why tax them for co2 and then never check it??

jasper5 wrote: It's a smoke test, the equipment used for all diesel tests is exactly the same, there are different limits, but it's the same test.

The same test equipment is also used for testing petrol cars, which are not smoke tested for obvious reasons.

They use a 4 gas analyser

Which looks for Hydrocarbons (unburnt fuel) Carbon Monoxide, Carbon Dioxide and Oxygen

This is also what they use to do the smoke test ;) and as i say on later diesels, co2

I'm sorry my friend, but you are wrong, there is one test for Petrol cars and another for diesels.
I take at least 4 cars a week for mot test...I have 2 tomorrow.

Read this....http://www.ukmot.com/6-4.asp#Text_top

My HDI went through the MOT a few months ago and they didnt do any type of emissions test on it which I thought strange because in NI the MOT is pretty strict.

Would I be right in saying you get a little 'Rappooo' type noise when changing gear with a de-cat on the HDI? A couple of my mates have straight-through's on their Bora's and Toledo's and they're pretty loud. People have said to me you wouldn't get this noise with an HDI but I can't see why not, your just removing the restrictions and letting the gases escape, this 'dump' of gases is what makes the noise, right?

The HDi uses the turbo waste gate to regulate and 'dump' excess boost pressure so you may very well get some weird noises going on without a CAT.

I'm sorry my friend, but you are wrong, there is one test for Petrol cars and another for diesels.
I take at least 4 cars a week for mot test...I have 2 tomorrow.

I agree here from testing vehicles mysefl as i said before. It can be confusing because both the smoke tester and the gas analyser are usually connected to the same pc/piece of software but the 2 tests are seperate and as i said b4 what a crazy society we have where our tax brackets are set by the co2 level of a car yet on diesels we dont actually check it after manufacture! So you are free to decat (as long as this doesnt effect smoke output) and therefore polute the atmosphere more then a petrol would as diesels also produce more particulates and NOx then petrols which is pretty nasty stuff