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n75C vs. n75J comparison...

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  • n75C vs. n75J comparison...

    I finally got around to doing a good comparison with my n75c and n75j valve. I posted this on vortex, but I never check there anymore so I thought I'd post here too.

    Originally, I had some surging going on with the C valve. I tried the J, which made it even worse. Then I got myself a Forge TIP, which cured all surging :mrgreen: and so I thought I'd try the J valve again! I was going to sell it, but now I think I'm going to keep it!

    So, the below graph is a chipped 1.8T (Upsolute) with 2.5" downpipe, TDI midpipe + stock muffler, Powergasket, Forge TIP and a PiperX flat-panel air filter.

    Note that there aren't any oscillations (yay forge TIP!) but there sure is a good boost spike :mrgreen: The big difference is between 3000 and 3500 rpm.



    For reference, here's me with just a chip and 2.5" cat-back:


    Now I want to try an H valve. Anybody have one for sale? Or even to borrow for a week so I can add to my graph?
    1.8T
    Not quite stock anymore...

  • #2
    Re: n75C vs. n75J comparison...

    I believe dale has a H for sale. Your J #'s look exactly like mine. Nice spike and then drop to 14-15 PSI throught the RPM band. The APR tiptronic programming does the same but holds around 16 PSI. Saw this on Trompings car.
    2008 BMW 135i | M Package | JB3 | DCI | BMW Performance Exhaust

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    • #3
      Re: n75C vs. n75J comparison...

      Originally posted by QuA
      I believe dale has a H for sale. Your J #'s look exactly like mine. Nice spike and then drop to 14-15 PSI throught the RPM band. The APR tiptronic programming does the same but holds around 16 PSI. Saw this on Trompings car.
      Getting your curve closer to, not further from, the requested curve should be your goal to maximize hp...
      KR
      Porsche 991 Carrera S

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      • #4
        Re: n75C vs. n75J comparison...

        does anyone know which valve reacts the fastest?

        i found the same thing as you when playing with the j and f. the f seems to react faster than both the j and c
        Last edited by 1.8Trip; 08-23-2004, 07:12 PM.
        Neil
        '03 Silver Jetta 1.8T - gone, but not forgotten


        mods to my car

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        • #5
          Re: n75C vs. n75J comparison...

          True dat,

          Yup. I was testing the MBC again on my car with the FMIC installed. I dont hit limp mode but I still get funny boost patterns when I redline shift.

          QuA

          Originally posted by Kor
          Getting your curve closer to, not further from, the requested curve should be your goal to maximize hp...
          2008 BMW 135i | M Package | JB3 | DCI | BMW Performance Exhaust

          Comment


          • #6
            Re: n75C vs. n75J comparison...

            paging Dale...

            Beuller...Beuller...anyone...anyone?
            1.8T
            Not quite stock anymore...

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