Foot brake technique with twins

Discussion in 'Forced Induction - 5.0L V8 Engine' started by awdtsi, Aug 20, 2018.

  1. awdtsi

    awdtsi Well-Known Member

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    So I was wondering what some of you guys that pull low 60 foot times do to launch your twin turbo cars? I have a Boostworks kit with Comp 6062 turbos and a Circle D 3B 258mm converter. I came from an AWD 5 speed drag racing background and my first time at the track with my Mustang left me feeling like my 60 foot times were pretty bad.

    My problem was that I was pulling through the brakes while trying to build boost. I was only able to cut 1.65 60' times and ran a 10.2 @ 140. My question is how do you guys foot brake effictively? Do you hold to a certain rpm and flash it or can your brakes hold back the car with your foot to the ground? I'm new to auto drag racing and any tips would be appreciated.

    Thanks
     
  2. Black Dog

    Black Dog Looking For Trouble

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    Time is respectable.
     
  3. drive_55_not

    drive_55_not Well-Known Member

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    You'll barely build boost trying to foot brake before you start blowing thru the brakes ... You need a transbrake to really lock it up ...

    You could add a 2-step, that'll let you get a little more rpm on the converter foot braking ...



    .
     
  4. 3beeps

    3beeps Well-Known Member

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    I have the same issue you do. Twins and a 2B converter. On the 2-step, I push through the brakes at 3000 RPM once the boost goes positive.

    I've added a 2-relay transbrake so that should solve the problem. I'm surprised you push the brakes with the looser 3B converter.
     
  5. VRP

    VRP Boost Loading...

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    I can only get about 3200rpm out of my 3B before it starts to push thru... Transbrake is the answer!
     
  6. Dennisn

    Dennisn Well-Known Member

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    I’ve been footbraking for almost two years. 3b with two step. Usually 60 low 1.5 and 1.4’s. I’m gonna try the tb and see if I can’t get consistent 1.3x’s
     
  7. OP
    OP
    awdtsi

    awdtsi Well-Known Member

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    What rpm do you hold it at?
     
  8. Dennisn

    Dennisn Well-Known Member

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    With two step push hard on brake and floor it. Wait second or two. Let off brake and she goes. If I’m on it long enough it’ll build 4 lbs of boost.
     
  9. VRP

    VRP Boost Loading...

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    You need MSD 2 step @ OP!
     
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  10. olaosunt

    olaosunt Well-Known Member

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    Consider the aerospace double calipers for the rears.
    I have a 2B converter and I can now build 7 psi on the foot brake with the 2 step set to 3700 rpm .
     
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  11. gimmie11s

    gimmie11s Well-Known Member

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    Guys what wire are you tapping for your MSD 2 step off the brake pedal on the auto cars?
     
  12. Hyper771987

    Hyper771987 Well-Known Member

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    Did you ever figure out which wire to tap into?
     
  13. VRP

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    I use the brake light switch positive wire that sees 12V when you press the pedal, that way when foot braking 2 step is active!
     
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  14. hawk232

    hawk232 Well-Known Member

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    I have footbraked a 1.45 60' before i put the 2 step on. stand on the brakes and slowly bring rpm up. Highest "boost" I saw was 0.0 or 0.1.

    Put the 2 step on and have now seen up to 5psi without a transbrake. Only been to the track once but had other issues so no times to report.
     
  15. 3beeps

    3beeps Well-Known Member

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    I had trouble pushing through the brakes on the 2step and footbrake. I wonder if its because I have a 2B and you have a 3B.
     
  16. hawk232

    hawk232 Well-Known Member

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    What do you have it set at? Im at 3k and my brakes hold just fine.
     
  17. DavidHuff

    DavidHuff Well-Known Member

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    You guys running 1.45 sixty feet times should be more than happy.Just Saying
     
  18. hawk232

    hawk232 Well-Known Member

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    If I am happy I will quit trying to get better and that just wont work for me! I will say that I was excited to go 1.45 my first time out on this setup.
     
  19. 3beeps

    3beeps Well-Known Member

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    Same 3k. Is there any technique to help apply more brake pressure once staged? Maybe pumping the brakes or something? Or just floor the brake, floor the gas, let off the brake and hold on lol.
     
  20. kcc0521

    kcc0521 Well-Known Member

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    I had no luck using the 2step and foot brake on my car with a 245 3C. The car would just push before it made any boost. I threw a 2B in the car and still couldn't make any boost. Best 60ft was in the 1.5 range. Threw a 2 relay transbrake and on a good track it has been 1.28 60ft leaving at 3700 and 5psi.
     
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