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  1. #1
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    Question Blocked exhaust/cat

    Hi, have been having some boost problems,as stated on previous posts, anyway on a run home from Devon to London earlier this week, the car ,96 1.8t chipped, got slower and slower and was maxing out at 5psi.Then struggling up a hill at 70 mph with my foot buried, there was an almighty noise and a sudden lurch forward!, as I re applied the thottle, obviously I had lifted off completely, It was obvious the exhaust had blown. Although incredibly loud,the car was now running free as a bird and hitting 15 psi plus on 1/2 throttle.A quick stop revealed the cat had blown away from the turbo flange mounting.Now my question, I am using a mates ramp at the weekend for an examination/replacement of the faulty exhaust parts, I wondered if there is a common part that blocks/fails, I'm guessing its the cat,but if anyones come accross a similar problem, a heads up is always useful.Thanks in advance.

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  3. #2
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    The cat blocking is not unheard of. Also the cat breaking form the flange is quite common.

    You have several options, remove the cat and clear it out, and reweld. That will be ok till next MOT. Or stick a performance CAT on, i believe there to be one on Ebay as we speak. Or just get a pattern replacement at the cost of around 100 iirc

  4. #3
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    Yeah was looking at a clean out and re weld ,initialy at least, just to make sure it is the cat and not another part.Are those sports cats worth fitting, I've seen conflicting reports, or is it just worth fitting a pattern part. I suppose i'll find out of theres any gain, when I clear out the old cat.

  5. #4
    docurley's Avatar
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    I have a Standard CAT for 60 and I'm in London if that helps.
    Black Audi RS4 2006 Exclusive edition, Black optic option (stock for now)

  6. #5
    "Stick a V8 in it!"

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    I took a gutted cat off my car last MOT, and fitted one of these:

    https://sslrelay.com/buypartsby.co.u...p?recordID=816

    Seems to do the job, dunno how it would be on a tuned engine though.

    I still have the gutted cat laying here, can make me an offer for it if you want it, as its been laying in the porch for months.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  7. #6
    Markey's Avatar
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    I have just had my de-cat fitted and the mech said that my old cat had broken and turned round inside blocking the flow. I was suffering from servere under boost having to use lowere gears to get up hills and the car would not go above 80 on the motorway which was terrible.
    A4 Avant project now started ! see this thread ! http://www.audi-sport.net/vb/a4-s4-forum-b5-chassis/43296-bit-project-going.html
    If you think my post had a usefull purpose please say thanks

  8. #7
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    mine blew apart at the same time, had it re-welded twice but does not take to well with the different metals of that cat and the flange, worth just replacing straight off, saves the grief

    2001 S3 (AMK)
    AEM WMI Kit, Black Silicone Hoses, Badger5 TIP with Cone Filter, AH Fabrications FMIC, Relentless Manifold Downpipe & Sport Cat, Miltek Cat Back Exhaust, VAG Aero Wipers, Forge FMDV008 Re-Circ, Revo Stage 2 Remap with SPS+ Tweaks, 2.0 TFSI Coil Pack Mod, B&M Short Shift, RNS-D Retrofit, Brembo & B5 2 Piece Rotor Conversion

  9. #8
    "Stick a V8 in it!"

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    Markey what do you plan come MOT time? Dodgy tester or swap the real cat back in?

    I didnt actually realise the cat on ours was gutted before i removed it, i just assumed it wasnt working properly. Its probably become blocked and some garage has disemboweled it when it was with the previous owner.

    It was a complete ******* to get off the car though, i ended up putting the grinder thru the downpipe as the cat->downpipe bolts were rotten away and really awkward to get access to, and i was replacing the downpipe anyway. I decided i would just fit the new cat and leave it like that, as the extra 5-10hp that may or maynot be unleashed just wasnt worth the hassle of changing between them.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  10. #9
    docurley's Avatar
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    I have a MillTek down pipe and my Hybrid K04 to install and if I win Marky's Sport CAT I will be all set to go providing Marky stop getting his mates to bump the price up so I will have two spare CAT's
    Last edited by docurley; 27th March 2009 at 16:16.
    Black Audi RS4 2006 Exclusive edition, Black optic option (stock for now)

  11. #10
    "Stick a V8 in it!"

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    is the B6 and B5 cat the same?

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  12. #11
    Markey's Avatar
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    Quote Originally Posted by aragorn View Post
    Markey what do you plan come MOT time? Dodgy tester or swap the real cat back in?

    I didnt actually realise the cat on ours was gutted before i removed it, i just assumed it wasnt working properly. Its probably become blocked and some garage has disemboweled it when it was with the previous owner.

    It was a complete ******* to get off the car though, i ended up putting the grinder thru the downpipe as the cat->downpipe bolts were rotten away and really awkward to get access to, and i was replacing the downpipe anyway. I decided i would just fit the new cat and leave it like that, as the extra 5-10hp that may or maynot be unleashed just wasnt worth the hassle of changing between them.
    Im going to get a custome exhaust made anyway with a cat in it. Also my mechanic mate said if you remove the air filter the emissions change and it should pass anyway, its a known trick on some cars that just fail on emissions.
    A4 Avant project now started ! see this thread ! http://www.audi-sport.net/vb/showthread.php?t=43296
    If you think my post had a usefull purpose please say thanks

  13. #12
    docurley's Avatar
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    Quote Originally Posted by aragorn View Post
    is the B6 and B5 cat the same?
    When you order a decat pipe in the US they are listed the same.

    http://www.audizine.com/forum/showth...ight=test+pipe
    Black Audi RS4 2006 Exclusive edition, Black optic option (stock for now)

 

 

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