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        General >> Give/Need advice to/from others >> De - Catting
        
(Message started by: cueball57 on Oct 11^th, 2007, 11:05am)

Title: De - Catting
Post by cueball57 on Oct 11^th, 2007, 11:05am

I have read a couple of post's on here about de-catting to improve the power. How would this effect the mot, or do you just put the cat's back on for the test.

Title: Re: De - Catting
Post by Highlander on Oct 11^th, 2007, 2:11pm

My 24v still passes the emission test with the cat internals removed but not by much :)

Title: Re: De - Catting
Post by martin_rowe on Oct 11^th, 2007, 3:51pm

when I enter details of my 24v into DOT computer it says test as non cat.

Title: Re: De - Catting
Post by cossie_al on Oct 12^th, 2007, 12:51pm

my 24v failed its mot on emisions So I replaced the cats and found the old ones were completely empty.
I found no difference in power when I put the new cats on.

Title: Re: De - Catting
Post by Tons_of_fun on Oct 12^th, 2007, 2:25pm

My cat actually fell apart internally,so i emptied it out & re fitted.Had the emissions checked purley out of intrest and was told it will fail.Dont honestly think the car performs any better either

Title: Re: De - Catting
Post by dan_the_man on Oct 12^th, 2007, 5:19pm

I'll let you know how I go performance wise once my new cat's are fitted. running empty at the moment. I have timed a 0-60 a couple of times and intend to do so again on the same roads with them in . my blowing manifould will be repaired so a slight advantage will be given to the cat's on test !
I like the sound with them out though .

Title: Re: De - Catting
Post by cossie_al on Oct 14^th, 2007, 7:26pm

I am of the opinion that if your engine is in good condition and running perfectly you may just get through the emissions test with empty/no cats.
But as I said, I found no difference in performance between new and no cats :-/

Title: Re: De - Catting
Post by Highlander on Oct 16^th, 2007, 1:30am

removing the cats would only give you another 5-10 bhp (unless you are the guy on ebay the other week who gained 100Bhp lol) so you would hardly notice. i dont notice any difference but i know its there ;)

One day i'll get it on a rolling road!! ;D

Title: Re: De - Catting
Post by scorpio_man on Oct 16^th, 2007, 8:14am

hi there
de-catting appears to make most difference to the 16valve engine when done with a proper de-cat pipe.

might be something to do with 4 cylinders going into the cat than 3 from the v6.... less backpressure on the v6? :-/

does on mine, anyway. ;) ;D

Title: Re: De - Catting
Post by Alastair on Oct 16^th, 2007, 10:34pm

Hi Andrew

Was the de-catting prior to your last MOT - emissions OK ??

Alastair

Title: Re: De - Catting
Post by scorpio_man on Oct 16^th, 2007, 10:39pm

on 10/16/07 at 22:34:38, Alastair wrote:

Hi Andrew

Was the de-catting prior to your last MOT - emissions OK ??

Alastair

sorry alastair

i run on lpg, so no issue at MOT time (and have a friendly MOT man ;))

Title: Re: De - Catting
Post by dan_the_man on Nov 18^th, 2007, 4:38pm

as I said earlier in this post, I'd update you on performance with ref to the cat's. exactly the same on 2 0-60 tests. with the manifould fixed. she runs much better at tickover now with the cat's in .