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  1. #1
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    Flow benched a 82 MM T-Body

    Click here to enlargeFlow benched a 82 MM T-body
    Last Saturday I had some time to stick a 82 MM T-body on the flow bench.
    It Flowed 930 CFM. Then I installed the Y from a 80 MM set up. It Drop to 850 CFM. That is a 80 CFM drop? I'm looking to install this type of set up on my klee blower. I need to do more fabrication. If I was shipped a stock 74 mm , I would flow it for comparison against one with a Shaft grind done by (NOT ME)
    Cheers _PTEngineering
    Last edited by _PTE_; 04-28-2011 at 03:22 AM.

  2. #2
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    That is a nice difference between the two. So shouldn't that pretty much mean the 82 MM is the way to go without a doubt?

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    i think only if a y-pipe is correctly utilized or even a different airbox will make it more beneficial over an 80mm.

    That being said, I have an 82mm installed and getting a custom Carbon Box made. We'll see how that does when it's finished!

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    Click here to enlarge Originally Posted by ShangoAshe Click here to enlarge
    and getting a custom Carbon Box made. We'll see how that does when it's finished!
    Any details on the custom carbon box? Maybe put up a build thread?

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    have some pre-lim pictures but might not work for everyone sice I have the Top Mounts on my car it's designed to sit in between the two intercoolers and ontop of the supercharger!

    When I get some time I will start a buid thread for sure!

  6. #6
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    Click here to enlarge Originally Posted by ShangoAshe Click here to enlarge
    have some pre-lim pictures but might not work for everyone sice I have the Top Mounts on my car it's designed to sit in between the two intercoolers and ontop of the supercharger!

    When I get some time I will start a buid thread for sure!
    Excellent, sounds very interesting.

  7. #7
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    Click here to enlarge Originally Posted by _PTE_ Click here to enlarge
    Click here to enlargeFlow benched a 82 MM T-body
    Last Saturday I had some time to stick a 82 MM T-body on the flow bench.
    It Flowed 930 CFM. Then I installed the Y from a 80 MM set up. It Drop to 850 CFM. That is a 80 CFM drop? I'm looking to install this type of set up on my klee blower. I need to do more fabrication. If I was shipped a stock 74 mm , I would flow it for comparison against one with a Shaft grind done by (NOT ME)
    Cheers _PTEngineering
    As always great objective info from Pat. Thank you for posting! Looking forward to seeing the gains on your CLK!

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    1 out of 1 members liked this post. Reputation: Yes | No
    PTE: Did anyone ever send in a Stock TB? Curious if a new Y pipe (on 82mm) would give back the CFM if still using the stock intake tubes to the Airbox. I am looking to have a unit built from airbox to TB, but not sure it is work the $400-$500 to have built. Airbox would remain stock

  9. #9
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    I would like to see the comparison between the 82 and the stock w/ shaft grind mod...I have a stock TB sitting at home...I just need a grinder...
    Current: 2005 Mercedes E55 AMG
    Mods: Jerry Tune, 180mm Pulley, Heat Exchanger and H/E pump
    1/8 mile PB: 7.7@93mph 1.8 60ft
    1/4 mile PB: 12.0@115mph 1.8 60ft

    Previous: 2007 BMW 335i
    My Mods: Jb4, DCI, AR DPs, Muffler Delete, CP-E FMIC, NST Lightweight Pulley
    1/8 mile PB: 7.9@91mph 1.8 60ft Pump Gas Bald Tires
    1/4 mile PB: 12.5@112mph 1.9 60ft

  10. #10
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    Click here to enlarge Originally Posted by Bramage Click here to enlarge
    PTE: Did anyone ever send in a Stock TB? Curious if a new Y pipe (on 82mm) would give back the CFM if still using the stock intake tubes to the Airbox. I am looking to have a unit built from airbox to TB, but not sure it is work the $400-$500 to have built. Airbox would remain stock
    Who is going to build this for you?

  11. #11
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    Click here to enlarge Originally Posted by JoshM813 Click here to enlarge
    I would like to see the comparison between the 82 and the stock w/ shaft grind mod...I have a stock TB sitting at home...I just need a grinder...
    Sorry, what is the shaft grind mod? Essentially just grinding material off the stock throttle body? That basically just makes it an 82mm?

  12. #12
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    Well the shaft on the TB flap is pretty thick so people grind it down and smooth it out to allow more flow. You then have to use loctite on the shaft screws to make sure they dont become loose.

    I've heard that the flow close to an 80mm depending how much you shave off...here is a link to a thread:

    http://mbworld.org/forums/w211-amg/3...rind-talk.html
    Current: 2005 Mercedes E55 AMG
    Mods: Jerry Tune, 180mm Pulley, Heat Exchanger and H/E pump
    1/8 mile PB: 7.7@93mph 1.8 60ft
    1/4 mile PB: 12.0@115mph 1.8 60ft

    Previous: 2007 BMW 335i
    My Mods: Jb4, DCI, AR DPs, Muffler Delete, CP-E FMIC, NST Lightweight Pulley
    1/8 mile PB: 7.9@91mph 1.8 60ft Pump Gas Bald Tires
    1/4 mile PB: 12.5@112mph 1.9 60ft

  13. #13
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    How much they(shaft grinded) flow is speculative and no flow testing has been done. Rather they have calculated that reducing the shaft from (I'm making up
    #'s here) from say 10mm to 8mm is increasing the flow by 20%, which is incorrect. They are basing airflow on a two dimensional cross sectional area rather than a three dimensional model. I'm not saying it works, or doesn't work, just that their math is incorrect.

  14. #14
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    1 out of 1 members liked this post. Reputation: Yes | No
    I would love to see the flow test of the grind. Hi B!!

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    ^ Hey bud!

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    I have a machinist that can / will build be a new Y-Pipe similar to what has been done by other members (Loco for one). It would be coated aluminum, but I am not sure the value would be there. Obviously we are losing CFM through the Y-Pipe (If running an 82MM which I am) but the question would be: If a new Y-Pipe gets the 80CFM back, where is the next limitation. If a new y-pipe to airbox had the capacity to handle the new airflow, the shaft grind might become valuable on the 82. Today, it really doesn’t since we are at max flow already.

    Where is PTE when you need 'em??? Click here to enlargeClick here to enlarge

  17. #17
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    Click here to enlarge Originally Posted by Bramage Click here to enlarge
    Obviously we are losing CFM through the Y-Pipe (If running an 82MM which I am)
    Then why go to the 82 in the first place?

    Is the the OEM y-pipe diameter that is the restriction?

  18. #18
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    Click here to enlarge Originally Posted by Bramage Click here to enlarge
    Where is PTE when you need 'em???
    Try this:

    @_PTE_

  19. #19
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Then why go to the 82 in the first place?

    Is the the OEM y-pipe diameter that is the restriction?
    There are aftermarket Y-pipes available which may, or may not, flow better than the stock 80mm Y. Also, as you guessed, there is some meat which can be removed from the 80 mm Y pipe to better match the 82mm throttlebody.
    Next time out I plan on testing my other y-pipe(Carbonio). I'll report back any info here.

  20. #20
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    Click here to enlarge Originally Posted by lowprofile Click here to enlarge
    Next time out I plan on testing my other y-pipe(Carbonio). I'll report back any info here.
    Thanks.

  21. #21
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    Click here to enlarge Originally Posted by Bramage Click here to enlarge
    Where is PTE when you need 'em???
    He doesn't post here anymore - you can find him on MBW, however.

  22. #22
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    1 out of 1 members liked this post. Reputation: Yes | No
    nice

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