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Revo done - but need a new exhaust and hi-flow cat!!

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by OvettC, May 15, 2007.

  1. OvettC
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    OvettC Uhm... what next...

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    [May 15, 2007]
    Thought i'd finally make a new post! I have just had a remap done by Northampton Motorsport http://www.northamptonmotorsport.com/ and i can say with some authority that it is fantastic! Having driven an AMD remapped car and now having had my own 1.8t q 190ps remapped with the Revo software i finally have a quick and highly tractable car. Many thanks to Troy and team for their work and advice and also in diagnosing a knackered MAF.
    :hubbahubba:

    From my experience the remapping process is a personal thing and all down to your own driving style but as a start for me the Revo map is far less aggressive than others that i have tried with the VAG 1.8t engine (regardless of how the ECU was configured) and has resulted in a smooth and progressive power upgrade making roughly 30Bhp on the Oct95 fuel setting (i can't afford to run it on Oct98 just yet!)

    However! it would seem that i am also soon to be the proud owner of a new exhaust with the discovery that the CAT is in need of replacement and a new exhaust manifold - you can see where this is going! - i've immediately considered a Milltek solution with 90mm tips and a hi-flow CAT but with prices averaging £1400 inc.fitting!! i am wondering if there are any cheaper but still quality solutions for this slightly expensive predictament??

    :sadlike:
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  3. Elberoth
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    Elberoth Member

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    [May 16, 2007]
    I would get a Milltek cat-back and a test pipe instead of a cat. Revo should have a cat-delete file (otherwise you will get a CEL with test pipe).

    Test pipes are only 150 USD vs 800 GBP for the cat.
    #2
  4. OvettC
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    OvettC Uhm... what next...

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    [May 16, 2007]
    that sounds an awful lot cheaper which is good, but what about the MOT? surely a CAT has to be present?:think:
    #3
  5. J7USS
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    J7USS Shuddup Foooool!!

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    [May 16, 2007]
    Chris, You may aswell go the whole way and have a Decat. The yanks do it and swear by it. Just aslong as you aint one of the unlucky ones that get the dashboard lighting up like a christmas tree!!!!

    Miltek is what I wanted, couldnt afford it at the time so had a custom one made for £350.
    #4
  6. OvettC
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    OvettC Uhm... what next...

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    [May 16, 2007]
    i suspect you're right, the general concensus from friends is that a half way measure is only going to leave me a few month later wanting and knowing i could have had it if i waited....or there's always those 0% credit card purchases...uhm....:sorry: a rain check and a good think me thinks!!

    Dashboard christmas lights?? thats worrying? is this because the turbo spins up sooner due the Milltek design of the hi-flow cat and the ECU gets grumpy?? oooohh not sure now, its a daily drive don't want to make it too unreliable!

    Does anyone know if its a common problem, or does it appear to be a problem because people only post problems with it and not the successes?

    :confused:
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  7. OvettC
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    OvettC Uhm... what next...

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    [May 16, 2007]
    or... or... am i mis-reading this and you ARE saying take the CAT out of the way altogether with no Milltek anything apart from the exhaust?

    I assume this does mean i'd have to refit it for MOT time or find a friendily garage....
    #6
  8. Defratos
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    Defratos You’re Dethpicable!!

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    [May 16, 2007]
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  9. OvettC
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    OvettC Uhm... what next...

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    [May 28, 2007]
    thanks for the info, i've emailed them and had a couple of replies, they've been very helpful and i will be heading up there in the next couple of weeks or so, i was put in touch with a guy called Maz who's part of Audi-Sport and been very helpful.

    Still trying to decide whether i can afford the Hi-flow CAT option as well.... i think it'll be the case of rolling the dice and not eating for a few months!


    Can't wait! :hubbahubba:
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  10. OvettC
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    OvettC Uhm... what next...

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    [May 28, 2007]
    ...and finally had a chance to go over your website, the original link didn't work! got there in the end though. thats some pretty extensive modifications you made but all really well executed, nothing is over the top and everything is done as an inprovement, well done mate.
    #9
  11. Elberoth
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    Elberoth Member

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    [May 28, 2007]
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  12. OvettC
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    OvettC Uhm... what next...

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    [May 29, 2007]
    Blimey, you ain't wrong, there would seem to be the square root of didly squat difference there. Interesting, wonder whether Milltek will post a response to these findings?:faint:
    #11
  13. Elberoth
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    Elberoth Member

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    [May 29, 2007]
    As I said - get a testpipe together with a cat delete file. At least you will gain something - like 5hp - past 5000RPM.

    Here is a dyno plot I made before and after installing the test pipe.

    http://www.audizine.com/forum/showthread.php?t=112672

    Another bit worth installing is a Turbo Inlet Pipe. I gained 5 more hp peak and close to 10hp more in the 5500-6500rpm range just by replacing the stock rubber part.

    http://www.audizine.com/forum/showthread.php?t=113837


    BTW - Milltec HFC will trigger a CEL eventually. Only it takes longer to do so.
    #12
  14. golf
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    golf ***** rent boy VCDS Map User

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    [May 29, 2007]
    Elberoth, I thought I'd seen you from somewhere else. I've been over on the 'Zine for a while now too and your name kept sounding familiar on these forums.

    Anyway, how much did you get your TIP for and how easy was installation? I've been seriously thinking of changing mine as the OEM one looks like it might collapse any time soon. Does it really make a difference in the upper rev range?
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  15. Elberoth
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    Elberoth Member

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    [May 29, 2007]
    Install is potentially plug&play. I said "potentially" since you have to get the right one for your model year. Audi changed the design of the TIP around 2003 (they relocated the PVC valve) so you have to take that into consideration when ordering.

    I ordered the wrong one and had to source a 90' rubber elbow from a local parts shop to connect everything. Other that that - everything went smoothly.

    As you can see on the dynoplot, the TIP I used (which is made of SS) gained 10hp in the upper range. And yes - it is noticable.

    It is the most cost effective mod you can do to this car, after getting a chip. I recommend it highly.
    #14

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