Stage RPM

Discussion in 'PSI Superchargers Tech Questions' started by max, Aug 12, 2022.

  1. max

    max Member

    Joined:
    Apr 23, 2012
    Messages:
    47
    Likes Received:
    1
    Can someone explain why alcohol funny cars are staging at 8,000rpm (approx.) and then pulling 10 to 15 degrees of timing at the swap feet. Why not control the launch with fuel, low gear etc. It seems pointless to rev them right up only to pull all that power.
     
    #1
  2. Bob Meyer

    Bob Meyer Comp Eliminator

    Joined:
    May 13, 2003
    Messages:
    763
    Likes Received:
    36
    the term is "Instant Boost", the easy way was RPM, then blowers got coated & hand rubbed, the Monkey see factor, and several other things came into play, can't go backwards and "I think he's doing this", all factors are involved, without dead serious thinking ! Just look at guys like the Hool Bros. that do their own deal and you can get the picture without huge $ signs !
    Std. Disclaimer: I'm just a welder,,,, retired,,
     
    #2
    bigcat and max like this.
  3. rb0804

    rb0804 Active Member

    Joined:
    Aug 7, 2010
    Messages:
    671
    Likes Received:
    38
    Everything is better with rpm, except your valve train. Some funny car guys run a lot of GPM and don’t pull timing. It’s all about what your setup for and what your comfortable with. The higher you leave, the shorter the pull is to the shift point, the more boost you have, the better the clutch works, etc.
     
    #3
    max likes this.
  4. KJC

    KJC Authorized Merchant

    Joined:
    Dec 4, 2003
    Messages:
    330
    Likes Received:
    4
    more to it then you think
    there is a hand full of thing y
     
    #4
    max likes this.
  5. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
    Staff Member

    Joined:
    May 6, 2003
    Messages:
    6,706
    Likes Received:
    132
    A number of things come into play.

    Inertia helps snap the tire at the hit.

    If you are running a tall gear, a high launch helps get the car moving.

    In theory it should react quicker.
     
    #5
    max likes this.
  6. max

    max Member

    Joined:
    Apr 23, 2012
    Messages:
    47
    Likes Received:
    1
    What do you class as a tall gear?
     
    #6

Share This Page