Injector hat spray bar power gain ?

Discussion in 'PSI Superchargers Tech Questions' started by SMOKIN JOE, Aug 23, 2021.

  1. SMOKIN JOE

    SMOKIN JOE Member

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    I see alot of cars running some sort of spray bar in there hats , What's it worth on a screw ?
     
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  2. kosky racing

    kosky racing Comp Eliminator

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    the choice is yours?
     
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  3. jay70cuda

    jay70cuda Well-Known Member

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    I know on a roots their worth around 80-100 hp. That dual spray bar for a screw from Jeff Bohr racing is amazing to watch how much fuel is atomized in the hat. That's gotta be worth a bunch since a screw requires so much fuel
     
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  4. Mike Canter

    Mike Canter Top Dragster
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    It all depends on the humidity. If you run in Las Vegas where the humidity is super low it will act like a swamp cooler and will really lower the incoming air temperature thereby lowering the DA so you can burn more fuel. If you run in Houston or Gainesville where the humidity is high then not so much gain because it will not cool the incoming air. Overall you will probably get some gain if you adjust the fuel to match the change of DA caused by the spray bar and humidity.
     
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  5. TOL

    TOL Active Member

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    Please explain a dual spraybar for a screw. Trying to picture how that works...........
     
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  6. jay70cuda

    jay70cuda Well-Known Member

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    I'm sure he has a video on Facebook but I don't have Facebook. I seen it on Instagram and in awe of it. He is located in Michigan and is excellent to deal with. Very straight forward and honest. Jeff Bohr racing.
     
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  7. Mike Canter

    Mike Canter Top Dragster
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    They use dual spray bars with Roots also. You either have to have a horizontal bar or divide it up into two vertical bars between the butterflies
     
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  8. Ryan Van Dyk

    Ryan Van Dyk New Member

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    Do you need to add more fuel to the hat when changing from hat nozzles to spray bars due to atomisation or can you use the same nozzle area that you were using on the hat nozzles for the spray bar?
     
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  9. lucky devil

    lucky devil Member

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    We use the Hammer / Bohr hat with the spiral spray bar . It works really well and has really helped our performance . I can’t put an ET / HP number on it for sure but it certainly helps with intake temp and crispness if the throttle .
     
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