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  1. #1
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    AIRFLOW Work 08’ Exhaust

    AIRFLOW Work 08’ Exhaust


    Items flowed:

    2008 BRP Water Pipe
    2008 BRP Waterbox


    The focus on this session is to obtain better airflow for the 08 system. Just getting a baseline number is already better than the previous 04-07 Jpipe/Waterbox combo. Having flowed the units, then modifying the units accordingly, the number obtained were VERY IMPRESSIVE.


    For history on previous flow work, and reference as to the numbers, please click on this link…
    http://greenhulk.net/forums/showthread.php?t=40111


    *** The numbers below represent AIRFLOW ONLY...They DO NOT represent any numbers in regards to EXHAUST HEAT, WATER INJECTION, or BOTH.....ALSO, it represents ANY 4TEC motor (N/A, non-IC SC'd, SC'd) that is spinning at roughly 6000 RPM, and does reflect any other modifications such as external IC, air intake, SC upgrades, etc....Nor does it reflect airflow behavior above 6000 RPM, such as modded motors that spin at 8100-8600 RPM...BUT these numbers can predict what effect some mods will do at those air rates...


    08’ MidPipe

    This pipe is what replaces the old Jpipe configuration, which was prone to waterleaks around the weld points. This unit is a simple one piece cast, and is very durable. Upon flowing this unit, as compared to the old Jpipe, the numbers were DOWN big time! 5.0” in/H20, compared to 7.5”. That’s 33% LESS on just the pipe alone.

    Through flow work of the past it has been determined that a FLARE would help decrease BP and increase flow, we played around with different add-on tubes, sized to numerous dimensions and lengths. The best we found was a 2.75” pipe, sized down to fit the water pipe, and trimmed to a length of 4”. This resulted in a MASSIVE drop to 2.2” in/H20, resulting in a 56% drop over the original water pipe’s numbers, and by comparison, 71% / 49% LESS than a Jpipe stock/Jpipe FLARED respectfully.


    08 Waterbox

    This updated design is a much greater improvement compare to the old 04-07 versions. So following normal gutting protocol, which involved trimming the outlet pipe as flush as possible and opening up the baffle wall as much as possible, the following numbers were gathered.

    A gutted box yielded a HUGE drop in BP, down to 3.5” in/H20. Compared to the stock 11.7, that’s a 70.1% DROP in BP. Compared to a normal gutted 04-07 box (8.0” average), that’s a 56% drop.


    Combined, Stock Package/Modded Water Pipe and Gutted Box

    The combination of the 2 showed the best numbers we have ever seen. Before modifying, we flowed both units together as a package. Together they were at 18.3” in/H20, compared to the 04-07 package of 23.4”. This was a 21.7% reduction in BP, stock/stock.

    When the gutted box and water pipe were combined, they presented a package of 9.6” in/H20, or a 47.5% reduction over stock. That number dropped FURTHER when the water pipe modification was added. This modification dropped the package number to 6.3” in/H20, or a 65.5% reduction over stock. When compared to the best 04-07 modded package of 13.6”, that’s a 53.6% gain.



    For more info on previous Airflow work, check here...
    http://greenhulk.net/forums/showthread.php?t=65645
    http://greenhulk.net/forums/showthread.php?t=68684


    Pics and info...
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    Last edited by Danny; 09-04-2008 at 05:03 PM. Reason: Spelling


  2. #2
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    Flare on Water Pipe...

    As you can see in the pics, there is no clearance issues around the flare...
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  3. #3
    Test Pilot and Racer for Hire phoenixcustoms's Avatar
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    wow good info......I thought the stock water box on these X skis was as good as it got and modding them was just useless.....I wonder how it performs hooked up and running as well as any sound change.....I would think You might get a few RPM's but maybe not much....

  4. #4
    Site Admin Green Hulk's Avatar
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    Good info Danny. Thanks for taking the time to do this for us.

  5. #5
    i make, break, and fix things 08255's Avatar
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    what are the last pictures of?..so, cutting open the X box IS a good thing? looks alot more open to me...that cant be bad

  6. #6
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    Quote Originally Posted by Green Hulk View Post
    Good info Danny. Thanks for taking the time to do this for us.
    No problem Jerry, its FUN!

    Quote Originally Posted by 08255 View Post
    what are the last pictures of?..so, cutting open the X box IS a good thing? looks alot more open to me...that cant be bad

    The last 3 pics are of the stock OEM Water Pipe that replaces the Jpipe. In the picture you see the OEM pipe, with the rubber connector still in place, and the 2.75" stainless flare that we simple slid on. It can be attached with a set screw, or welded on.....

    The other 2 pics are what you see when looking into the waterbox itself, since the box had the rear cut off. Cutting the rear is not needed in this modification, just the front to gain access to the outlet and baffle.....What you also see is the Water Pipe and how it sits in the exhaust, and how the FLARE would sit when mounted up...

  7. #7
    beachbum0286's Avatar
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    Awesome work Danny!!!1

  8. #8
    BLACK MAGIC HEADERS hydrojunkie's Avatar
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    And I Bet It Still Wont Compare To The Gibson On The Water, All That Hackin And Weldin For What

  9. #9
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    Quote Originally Posted by hydrojunkie View Post
    And I Bet It Still Wont Compare To The Gibson On The Water, All That Hackin And Weldin For What

    Ther just numbers, take them as is....Not everyone has the money for a Gibson setup, nor would they want to pop a hole in their hull either

    An hour of elbow grease, a $20 spot to a local welder, and you got yourself a free flowing setup while retaining the stock appearance (with no through hull). The numbers on this setup are just under 60% that of a Jpipe/Gibson setup....BUT doesn't sound as mean though.

  10. #10
    subparwelder's Avatar
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    Danny, have you tested the r&d air filter? I had already bought this filter b4 I decided to make the kanaflex setup. This filter has a 4'' inlet so I used it instead of buying a new spectre. Just wondering if it flows as good as the spectre.

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