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  • question about removing the catalyst.

    my catalyst smell very bad and its strong.. so some one told me it may be clocked , so the question what is the benifit if i replace it with a pipe? or exhaust? , well the car run faster? or weaker? what about drinking fuel?

    any information will be apreciated..

    Car is V6 none turbo

  • #2
    If you can legally use your car without one, get rid of it. Make sure heat sensors etc. are re-attached. The car will gain a couple of bhp and use slightly less fuel.

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    • #3
      Hehe even if its not ligal ill handle it, but the good new more bhp and fuel saver , i will remove it today but what about if i empty it? and let it stay?

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      • #4
        That works. and a cool sound too!

        do you have emmision regulations in Lebanon?

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        • #5
          no we dont have i think....., just that the car doesnt smoke and its fine , do u have any idea how many bhp the catalyst kill from the engine?

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          • #6
            Better to completely remove them and replace with small silencers than 'empty them'. No data on cat removal on the V6, but you will gain some, but very little.

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            • #7
              i am planing to install a pipe instead of the silencer? what do u think about that?

              is that true if i remove the catalyst it could fool the ecu?

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              • #8
                Don't worry about ECU if the CATs are removed...

                You have perhaps heard about ECUs getting confused if the lambda-probe is removed - that is a different matter.

                I'd guesstimate a couple of percent more power from CAT removal on that engine - just a gut feel. You'll certainly notice a more sporty sound !!!


                Paul
                Paul Nugent
                Webmaster http://S2central.net
                Administrator http://S2forum.com

                1994 S2 Coupe ABY - aka Project Lazarus
                2001 A6 allroad 2.5TDi - family tank
                2003 S4 Avant 4.2 V8 - daily burble

                Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)

                There are only 10 kinds of people that understand binary - those that do, and those that don't

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                • #9
                  Dear Paul , i took it off! and geuss what? the multifunction display was showen average fuel 15l/100km on speed like 120 km , yesturday i was driving 180 km and fuel average was only 10.2 and 11 and the car now push much stronger in high rev , and the engine sounds better i am really glad for this in every way.. but.. i have a question.

                  Any body knows a specialist there who could make me a pipe instead of the catalyst that would look like oem and high quality? that it wont get rusty quickly....?

                  Thanks for every one

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                  • #10
                    have you noticed any smoking
                    its just when i got rid of mine it smoked for a while now its ok
                    94 s2 avant
                    aoc member 1116

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                    • #11
                      i dont know if it smoked , cause when i came home i droved 140km far from my home and all the way i was sliping it as a racing horse so today morning i`ve found my exhaust is pretty clean , while with the cato it was black .


                      do u know what kind of matier is inside the cat? they offerd me 100 euro for it?.........
                      Last edited by kninio; 8 November 2006, 16:08.

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                      • #12
                        Thats a result then - you got the job done, the car goes better and they offered you money for the old CAT.
                        Paul Nugent
                        Webmaster http://S2central.net
                        Administrator http://S2forum.com

                        1994 S2 Coupe ABY - aka Project Lazarus
                        2001 A6 allroad 2.5TDi - family tank
                        2003 S4 Avant 4.2 V8 - daily burble

                        Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)

                        There are only 10 kinds of people that understand binary - those that do, and those that don't

                        Comment


                        • #13
                          just want to share one reply from one well known exhaust systems company when I've asked them about catless exhaust (downpipe in this case) which they making/selling:

                          ''......cat bypass is not recommended at all; it has noxious fumes and the car will fall on it’s face off the line due to back pressure loss.
                          If you like power down low in the RPMS the bypass is not the way to go.
                          Some clients buy the bypass and then take them off, really not worth it. The 200 cells are the only way to go....''

                          comments are welcome

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