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Thread: RS6 Cold Air Intake Options

  1. #55
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    Quote Originally Posted by lswing View Post
    That's because nothing has happened with your car ...sorry, couldn't resist.
    Sad but true...

  2. #56
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    Had a couple of (relatively) free days on dyno, so did some testing with the buddy's RS6.
    Bottom line is - for anything bigger, than stock turbos, stock intake is very restrictive.
    Attaching a picture of 2 dyno charts & 2 overlaid airflow logs. It's the same car, essentially the same tune, but 2 different runs. One was with a stock airbox & filters. The other one with an open airbox (filter elements & airbox cover removed).

    Don't mind slightly different onset, I picked slightly different runs (as I didn't plan on posting this initially).
    Anyway, you can clearly see, that airflow peaks out at certain voltage & that's pretty much it, turbos can't get more air. (In the log plot, red is "voltage", which is more accurate, than the purple "airflow").
    Without filters/cover - you get an extra ~22 g/s, which can translate to 30-35hp difference at 6000+ RPM!
    Even then, you get a certain "air flatline", and that seems to be a restriction from the intake piping (MAF to turbos). It's already mildly ported in this car, but having something completely custom there might be much more beneficial.

    Bear in mind, this is much less relevant for stock turbos. This car has loba 650s (and they struggle to make even 600 due to intake/exhaust restrictions).

    EDIT:
    I'm in metricland, so "tq" is newton-meters.

    EDIT2:
    KN filters make 0 difference, compared to paper stockers. Or, well, maybe not 0, but within 1hp. Not helping with the airbox issue, pretty much.

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    Last edited by nubcake; January 22nd, 2020 at 02:40.

  3. #57
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    That's some great info! I really want to try swapping the stock intake with something like the Apikol kit, back-to-back at the drag strip and see what happens in the real world. If anyone wants to loan me one of their kits, I'll do the testing!

  4. #58
    Registered User RS8's Avatar
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    With stock RS6 airbox I had 613hp and 864Nm
    And with an open airbox I got 634hp and 883Nm
    With modified RS6 turbos.

    Now I run 2 rounded Simota Carbon fiber airbox and now it is only 2hp difference with or without these.
    RS6 engine, 6spd tdi 01E, upgraded RS6 turbos, custom built exhaust manifolds, A8 intake camshafts, wagners ic's, bigger fuel rails, AN8 fuel line, walbro 450lph fuel pump
    and EV14 1000cc/95lb fuel injectors in my S8/RS8

  5. #59
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    Quote Originally Posted by RS8 View Post
    With stock RS6 airbox I had 613hp and 864Nm
    And with an open airbox I got 634hp and 883Nm
    With modified RS6 turbos.

    Now I run 2 rounded Simota Carbon fiber airbox and now it is only 2hp difference with or without these.
    Exactly matches my observations.
    What's even more important - it's not as much about peak numbers, as about the area under the curve (difference towards redline is even more noticeable).
    Did you retain stock MAF location & housings? MAF to turbo piping?

  6. #60
    Registered User RS8's Avatar
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    Yes the curve was higher all the way.
    Here is the dyno papier from 2016:
    pull 1 with airbox= 609hp
    pull 2 No airbox = 634hp
    pull 3 with airbox = 613hp



    But now with Simota I use MaxxEcu so I don't use MAF's anymore,
    but I think it should have worked with the MAF in stock place.
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    RS6 engine, 6spd tdi 01E, upgraded RS6 turbos, custom built exhaust manifolds, A8 intake camshafts, wagners ic's, bigger fuel rails, AN8 fuel line, walbro 450lph fuel pump
    and EV14 1000cc/95lb fuel injectors in my S8/RS8

  7. #61
    Registered User hahnmgh63's Avatar
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    Which model of Simota airboxes? USP motorsports makes these for the MQB platform, I wonder if two of these would work pretty well?
    Click image for larger version. 

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    2003 White RS6 2013 Midnight Blue S5
    2013 Daytona RS5 2x944 Turbo's 1974 911 w/'91 3.6ltr motor
    Roy, WA

  8. #62
    Registered User RS8's Avatar
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    The biggest Simota I could find, it has 89mm neck size in and out (I think the RS6 airbox inlett is about 100mm)

    Simota SM-BX-007

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    RS6 engine, 6spd tdi 01E, upgraded RS6 turbos, custom built exhaust manifolds, A8 intake camshafts, wagners ic's, bigger fuel rails, AN8 fuel line, walbro 450lph fuel pump
    and EV14 1000cc/95lb fuel injectors in my S8/RS8

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