Upper or lower pulley?

Discussion in 'Off-Topic' started by Hammer Down, Feb 24, 2016.

  1. Hammer Down

    Hammer Down Gold Member

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    I thought I saw it somewhere, but can't remember and can't find it. So I need to pull from our knowledge bowl.
    Pcm swap and tune along with pulley swap. Is there a difference in boost gain whether swapping the upper or lower pulley? Im leaning toward the upper pulley because there is no grinding to do. But if im leaving too much meat on the bone ill do the lower instead. I'm only doing one as I'm content to stick with pump gas. Thanks for any insight.
     
  2. rags

    rags Hellcat Member

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    I've read 4 lb increase with a 2.85 upper. Lower was 2-3 lbs. That came from the HHP HemiTuner tuning thread.
     
  3. Toolman_42

    Toolman_42 Gold Member

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  4. TNCHARGER

    TNCHARGER SRT Hellcat Supporter Gold Supporting Member

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    AJ (Hemituner) advised me to go with the crank pulley because the upper OEM has a clutch built in to it that lets the SC free wheel when you let off the gas suddenly. My pulley is being installed as I type this....
     
  5. TNCHARGER

    TNCHARGER SRT Hellcat Supporter Gold Supporting Member

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    You are one funny troll Bo....LOL...I have had that pulley sitting on my work bench long before you began trolling here...
     
  6. TNCHARGER

    TNCHARGER SRT Hellcat Supporter Gold Supporting Member

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    Because no one believes you....and I wouldn't race you if you really had something...people with your attitude are not fun win or lose the race...I guess I better stop feeding you as we have been hijacking too many threads..been fun BoTroll...now where is that ignore button..
     
  7. graycat

    graycat Automobile Aficionado Extraordinaire Staff Member

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    I decided to do the lower pulley because I will be working there anyway pinning the pulley to the crank plus in my past experience the lower pulley has always worked out better for me. On my 14 GT500 the torque was improved at a lower RPM range than another car with the same mods but using an upper pulley instead of the lower one. Plus "belt wrap" is not an issue with the lower pulley.

    Both work well and I'm not saying that one is better than the other but for myself, it's the lower pulley. (First) I use only pump gas so the lower will be changed but I'll leave the upper as is.
     
    Last edited: Feb 24, 2016
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  8. Hammer Down

    Hammer Down Gold Member

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    The issue I have at this point is I see it put that the upper will give less boost than the lower and then I have seen it the other way too. I am really looking for a definitive answer on that. If the lower will give me more boost as far as just doing one or the other then that is the way I want to go.
     
  9. DrBuick

    DrBuick Gold Member

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    I did lower and a 2.65 upper have not driven yet due to roads
     
  10. rags

    rags Hellcat Member

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    The percentage difference between the 8.1" stock lower pulley and the 8.9" ATI pulley is less than the percentage difference between the 3.35" stock upper pulley vs the Metco 2.85" pulley so the upper change will always have more of an impact on SC speed than the lower pulley change. That is as long as you are changing to the sizes I have listed.
     
  11. Hammer Down

    Hammer Down Gold Member

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    Thanks all. I had originally ordered it for lower pulley. Then called down to HHP and switched it to the upper after thinking about it. If the same then I would rather not grind down the block if not necessary. So I'm sticking with the upper. Do you still run into issues with accessories at idle, if you swap the lower? Or is it a double with no Change to diameter of that part?
     
  12. Ray Hunsaker

    Ray Hunsaker Silver Member Hellcat Car Club Gold Supporting Member HCC Charter Member

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    doing the upper you have the advantage of changing sizes if you ever need or want to. maybe you do a road trip one day and want to drag the next. who knows.
     
  13. rags

    rags Hellcat Member

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    Swapping the lower reduces the speed of any accessories sharing the same belt causing some to have issues. Obviously not on a Hellcat as the SC belt is only for the SC Swapping the upper does not have this problem because the SC is a driven pulley and not a drive pulley.
     
    Last edited: Feb 24, 2016
  14. Ray Hunsaker

    Ray Hunsaker Silver Member Hellcat Car Club Gold Supporting Member HCC Charter Member

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    double it only turns the blower.
     
  15. Booky

    Booky Gold Member

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    That '15 GT500 is one rare car that will be worth a lot of money!;)
     
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