Low Gear Leanout

Discussion in 'PSI Superchargers Tech Questions' started by Crew, Feb 17, 2006.

  1. Crew

    Crew Volunteer

    Joined:
    Jul 31, 2005
    Messages:
    126
    Likes Received:
    0
    We are installing a low gear leanout on a PSI Dragster setup. Will plumbing the return back into one of the ports in the bottom of the pump hurt anything?
     
    #1
    Last edited: Feb 19, 2006
    Crew, Feb 17, 2006
  2. Crew

    Crew Volunteer

    Joined:
    Jul 31, 2005
    Messages:
    126
    Likes Received:
    0
    Found my answers...........
     
    #2
    Last edited: Feb 20, 2006
    Crew, Feb 20, 2006
  3. Eric David Bru

    Eric David Bru Member

    Joined:
    Sep 4, 2005
    Messages:
    417
    Likes Received:
    1
    What did you find out?

    I have always heard to run the returns back to the tank.

    EDB
     
    #3
    Eric David Bru, Feb 21, 2006
  4. Crew

    Crew Volunteer

    Joined:
    Jul 31, 2005
    Messages:
    126
    Likes Received:
    0
    I have asked a few teams and fuel guru's. I got both "if you return it to the bottom of the pump, it won't work" and "I run 30s & 40s with it returned to the bottom of the pump".

    So I guess it really doesn't matter......... Teams are running hard with it both ways.
     
    #4
    Crew, Feb 21, 2006
  5. Mike Canter

    Mike Canter Top Dragster
    Staff Member

    Joined:
    Mar 10, 2004
    Messages:
    4,630
    Likes Received:
    189
    If you return fuel to the bottom of the pump it is posssible to put that returned amount of fuel into a heating loop. In other words the fuel is heated initially when it goes through the pump the first time then it is now returned to the bottom of the pump as heated fuel that is again heated more when it goes back through the pump. This can go on for a never ending cycle. The heating of the fuel changes its density and its cooling properties when it gets into the motor. If heating the fuel didn't make a difference then why does everyone shield their plastic fuel cans and car tanks from the direct sunlight? Kinda make you wonder.

    The downside of returning fuel directly to the tank is if you return it close to the fuel outlet line of the tank it is possible to aerate the fuel so you want to ensure the returned fuel is directed far away from the outlet area.
     
    #5
    Mike Canter, Feb 21, 2006
  6. IGO1320

    IGO1320 T/D 2268

    Joined:
    Oct 14, 2005
    Messages:
    87
    Likes Received:
    0
    Fuel Return

    Mike,
    Does it make a differance how much fuel you return back? I run the returns back to a fuel log I made about six inches long and two inches diameter, that seems to cure both of the woes....or so I have been telling myself.
     
    #6
    IGO1320, Feb 21, 2006
  7. M Tigges

    M Tigges TAFC

    Joined:
    Jun 11, 2003
    Messages:
    644
    Likes Received:
    1
    We have done both still ran good! but its going to the tank now
     
    #7
    M Tigges, Feb 21, 2006
  8. Bob Kraemer

    Bob Kraemer New Member

    Joined:
    Feb 24, 2004
    Messages:
    422
    Likes Received:
    1
    Since you are running a dragster you can weld some -6 fittings into the main fuel line about 3ft away from the pump and route your return lines into them.
    I would route the lines to a seperate fuel log (not attached to the pump or engine, helps stop heat transfer) then to the added fittings in the main fuel line.
    That way the returned fuel would have more time to cool off before re-entering the main fuel line.
    Also with using the new cloth braided line mentioned in another post will keep the weight down and the fuel cooler since the cloth braided line will not hold the heat in like the stainless steel braided line will.

    Just my .02 cents worth
    Bob
     
    #8
    Bob Kraemer, Feb 22, 2006

Share This Page





XenPorta 2 PRO © Jason Axelrod from 8WAYRUN.COM