Clutch Lockup 1/8 Mile

Discussion in 'PSI Superchargers Tech Questions' started by nitrorelapse, Jun 12, 2009.

  1. nitrorelapse

    nitrorelapse Member

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    What point would the ideal time or distance to lock up the clutch on an 1/8 mile track?
    Blown alcohol, 526 CID, BAE 5, PSI roots, 3 speed, Crower 10" pedal clutch, 4:30 gear, on marginal race tracks
     
    #1
    nitrorelapse, Jun 12, 2009
  2. Rodney O. Trower

    Rodney O. Trower New Member

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    just after you are going fast enough not to smoke the tires..LOL
     
    #2
    Rodney O. Trower, Jun 13, 2009
  3. JP

    JP Member

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    Funny...but thrue:D


    You need to let it spin to make torque them lock it to make the car go.
     
    #3
    JP, Jun 13, 2009
  4. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    lockup

    The answer is as soon as you can without shaking, smoking the tires or bogging the motor down.
     
    #4
    Will Hanna, Jun 13, 2009
  5. RUGSTER

    RUGSTER New Member

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    Clutch Lock-up!


    Will,sounds easy:rolleyes:............NOT!!!!! LOL.
     
    #5
    RUGSTER, Jun 13, 2009
  6. Lethal Threat Racing

    Lethal Threat Racing New Member

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    We look for 1.4 seconds and never later than 1.6. Hope this helps. The next question will be how right? Well this is the trick. It is a moving target. It just take laps and tons of data.
     
    #6
    Lethal Threat Racing, Jun 14, 2009
  7. JRB

    JRB Guest

    Classic Will, Classic! :eek::D

    How far into the run is the top of low gear?
     
    #7
    Last edited by a moderator: Jun 14, 2009
    JRB, Jun 14, 2009
  8. Dale Finch

    Dale Finch Member

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    Hey guys,
    Lets be serious. First how many grams do you have on the clutch. Second, how hard are you turning the engine. Do you have a computer? How much is the engine pulling down after the shifts? And we should ask if you have a 10.7 clutch? We need to know what the reference points are.
    Just my thoughts if we are going to help.
    Dale
     
    #8
    Dale Finch, Jun 16, 2009
    Greco400 likes this.
  9. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    lock up

    as simple as it sounds, that's the answer.

    there's a hell of a lot more things that affect how all of that works, but as far as a 'magic' point, well that's going to be specific to your combination and how you run your combination. if you run a lower gear, it's going to be later than if you ran a taller gear.

    so back to the original equation:

    If you can't lock the clutch up by the top of low gear, you probably have too low a gear. The other side of this is it could have way too tall a gear and just blows through the clutch. If it's too low a gear, it will have great 60' times but get into shake somewhere afterwards. If it's too tall, probably slow 60', either followed by weak shake or just not going anywhere.

    Once you get in the ballpark with a low gear ratio for your power range, keep on adding weight until it shakes or pulls the motor over. If the motor goes up, then pulls down, then goes back up, probably too much counter or in some cases, not enough static.

    You can absolutely throw all of this out of the window is your clutch floaters, donut and flywheel aren't DEAD flat. Whoever cuts your clutch floaters needs to cut them within .0005 or less. Close enough won't cut it. You'll be hard pressed to get it to act right if it isn't flat.
     
    #9
    Will Hanna, Jun 16, 2009
  10. JustinatAce

    JustinatAce Member

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    Will hit it right on the head. And then, throw in the fact that you've got "marginal" tracks to contend with as stated in the initial thread. I hear the words "marginal track" and I think of tall 1st, some pulled timing and a smoldering clutch. The answers sounded smart-assed, but that's all the information you can really reliably give without knowing the car's tendencies.

    There is no magic number with a clutch because there are too many variables you just can't account for and every car acts a little different.
     
    #10
    JustinatAce, Jun 16, 2009

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