Might be easier than doing the crank pulley....

Discussion in 'SRT Hellcat Performance' started by StellasHC, Jun 24, 2015.

  1. StellasHC

    StellasHC Platinum Member

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    Anybody see this yet? Dont know if its been posted. Found it on FB on Craven Performance's page. Im thinking this is made by Metco? image.jpg
     
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  2. B5 Blue

    B5 Blue Platinum Member

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    But does it have a pseudo clutch like OE?
     
  3. LaserDoc

    LaserDoc Gold Member

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    I've been following Craven and saw their FB pic, as well. I'm excited to see their dyno results.
     
  4. DrBuick

    DrBuick Gold Member

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    I would say no
     
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  5. B5 Blue

    B5 Blue Platinum Member

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    Me too so more wear on SC
     
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  6. KLR CAT

    KLR CAT Active Hellcat Member

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    Certainly clutchless, and certainly not required. Clutched SC pulleys are one of those engineering solutions to where there is no real problem. Might it prevent some bearing wear in snout drive, maybe?...Would most people every be affected by it, probably not. In theory it may improve efficiency in non loaded situations allowing the SC to freewheel, but we are talking about 700+ hp muscle cars here, who cares about that? You also give up a touch of boost response on clutched SC's. The Benz 55K cars were certainly more boost responsive when switching from a clutched to non clutched pulley.

    All that to say, SIGN ME UP FOR SOME STACKED UPPER AND LOWER PULLEYS!
     
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  7. hellcat1

    hellcat1 Gold Member

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    If they can tune the boost controller to not open,,I will be one of the first in line to get this
     
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  8. dHL0L

    dHL0L Gold Member

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    What a - pause - , just what are we looking at here?
     
  9. 4510

    4510 SRT Hellcat Supporter Gold Supporting Member

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    The pulley on the S/C snout. It is aftermarket, probably smaller in diameter than OEM and not a clutch type as you find on your HC from the factory.

    Smaller diameter = higher RPM = increased boost.
    Smaller diameter adds to the propensity for belt slippage
    I don't have an opinion on the clutch vs no clutch setup as I don't know all the proposed advantages.
    But the smaller pulley on the blower is very common in S/C applications.
     
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  10. DrBuick

    DrBuick Gold Member

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    I will say Metco has some nice products
     
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  11. B5 Blue

    B5 Blue Platinum Member

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    Not really people have them already:D
     
  12. hellcat1

    hellcat1 Gold Member

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    I don't know off anyone that has a boost controller on a hellcat
     
  13. KLR CAT

    KLR CAT Active Hellcat Member

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    Anybody who has HP tuners can set the MAP value for the TB bypass table to something it could never hit. IE set the total pressure to 300kpa or whatever the max value allowed for the cell is. There is no such thing as an independent boost controller for these cars.
     
  14. hellcat1

    hellcat1 Gold Member

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    Klr cat, so if they can do this,, can they change when it opened so we can make more boost?
     
  15. KLR CAT

    KLR CAT Active Hellcat Member

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    That's not the way it works. The Bypass TB is a normally open setup, and is commanded to close in order to stop recirculating the discharge air into the intake stream. This allows the manifold to pressurize. The blower can only move so much CFM of air based on its displacement and RPM. For clarity the only we need to care about is CFM, not boost when it comes to power. The OEM IHI superchager has been stated to move 30000 lpm of air, at an assumed 6200rpm motor speed and a blower ratio of 2.36 for a blower drive speed of 14600rpm. That converts to 1060CFM of capacity The only way to increase boost is more base RPM ( IE 6500-6700 RPM), or OD pulley. CFM roughly equates to .66whp per CFM in an SC/Turbo motor where VE is assumed to be 100% or greater since its forced induction. so So math works out like so:

    1. 10% bump in RPM should net 1166CFM @ 16095rpm and 769whp
    2. 18% OD pulley should net 1250CFM @ 17265rpm and 825whp

    Most positive displacement blowers can be pushed to about 20000rpm so almost 30% OD total which would be about 1378 CFM and 909whp, which is about what I would expect the limits of the stock blower to be before its just a giant heat pump.
     
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