Get Your Thinking Caps On

Discussion in 'PSI Superchargers Tech Questions' started by blwnaway, May 12, 2008.

  1. blwnaway

    blwnaway Member

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    OK, I run exibition only and for my own personal thrill, however my car would be somewhat competitive in an NHRA field. That being said I have a question. I run 1/8th mile only and have had problems at the gear change with shake/spin. I am curious if I put for example a 5.00 rear gear with a 34.5 tire and add alot of counterweight is it possible that I can leave in high gear and do away with the 2 speed I curretly run? Possibly even add a lock up type clutch to bring in more counterweight as I go down track.
     
    #1
    blwnaway, May 12, 2008
  2. blwnaway

    blwnaway Member

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    133 views and no one has an opinion?
     
    #2
    blwnaway, May 12, 2008
  3. altered boy

    altered boy Outlaw Altered

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    ok... i'll nibble here. there are a bunch of different kinds of NHRA fields out there and a million ways to skin a cat.

    probably gonna need some details... chassis type, motor (w/some details), fuel %, trans/clutch, current rear gear, lenco details, you know... the detailed basics

    my gut answer is... hell give it a try whats the worst you're gonna do have to grind a few discs and floaters :D
     
    #3
    Last edited: May 13, 2008
    altered boy, May 12, 2008
  4. mark6052

    mark6052 Member

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    prop spinning on your cap?

    before thinking outside the box, what do you think is causing the shake/tire spin. fuel setting wrong for the conditions? (fat) clutch set wrong for the track/ fuel tune? but instead you want to try a "different" approach. :rolleyes: goodluck. learn the basics, improve on them. then try being an innovator.
     
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    mark6052, May 12, 2008
  5. blwnaway

    blwnaway Member

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    No NHRA field to worry about. THis is exibition and fun. BAE 5, PSIC, Currently run a 5.00 rear gear and a 1.31 low with a 34.5 Goodyear. Car weighs 2130.
     
    #5
    blwnaway, May 13, 2008
  6. blwnaway

    blwnaway Member

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    Why cant I just put more C/W and leave in high gear? Does anyone know why this will or will not work. Remember this is 1/8th mile only, I am shifting out of low now about 450 to 500' down track now with a 1.31 low.
     
    #6
    blwnaway, May 13, 2008
  7. mbaker3

    mbaker3 New Member

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    I like Altered Boy's answer:

    Go to the track, put it in high gear, dump the clutch, see what happens! ;)
     
    #7
    mbaker3, May 13, 2008
  8. Jordan Pawlick

    Jordan Pawlick TAFC

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    expect driving through the clutch over reving the motor and a rod or 3 on the track as well but try it and let me know how it turned out thou
     
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    Last edited: May 13, 2008
    Jordan Pawlick, May 13, 2008
  9. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    smaller step

    why don't you split the difference and try that first? put a 1.19 or so low in it, and yes, it will take a lot more clutch.....

    next question is does the shake happen before or after the shift? if after the shift have you tried putting a jet in the shift pod to slow the air release? also, maybe it just needs wicker.

    i've heard tell jason scruggs runs direct drive set up...
     
    #9
    Will Hanna, May 13, 2008
  10. blwnaway

    blwnaway Member

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    Wel I didnt know that they made a 1.19 gear set. I thought 1.25 was the highest ratio. I heard the same thing about that door car and if it works for him then it would work in my application but you know how rumors are, no one really knows or they would all be as fast as him :rolleyes:
     
    #10
    blwnaway, May 13, 2008
  11. blwnaway

    blwnaway Member

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    :confused:
     
    #11
    Last edited: May 19, 2008
    blwnaway, May 19, 2008
  12. mark6052

    mark6052 Member

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    try this. walt and pat austin tested a 2sp trans, they went back to a 3sp. the best out there runs a 3sp (manzo) and GOD only knows what else. and yeah I know thats 1/4 mile. but he's darn quick in the 1/8 too:eek: to be blunt, you and I are no bodys, learn to get your car down the track correctly, repeatedly. then try re-invent the wheel.;) innovation at this level is when you have money and the back ground to back it up.
     
    #12
    mark6052, May 19, 2008
  13. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    gear ratios

    you can get taller than 25% by going to a compound gear set. you have to get a case with a 3/4" extension. They make all the way down to 10% gear sets for when the Top Fuel and A/F cars ran 2 speeds.

    even if he is running a direct drive setup, I doubt he has a standard rear end ratio.

    about 10 years ago when my dad was running a blown alky mud truck on a 250 ft track, we took one of the old 3 stage top fuel clutches with an electric controller, which is pretty close to the lock up clutches they use now in the outlaw pm ranks. the car had a three speed lenco, but we launched in high gear with a real low rear end gear. my dad had two toggle switches on the steering wheel. depending on the conditions of the 'ruts' off the line would determine how quick he threw the second stage, then once he got to the smooth mud, he threw the third stage in and locked the clutch all the way up. he also drove away from everyone once he hit that third stage.
     
    #13
    Will Hanna, May 20, 2008

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