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Thread: Tire shake with P/G

  1. #1
    Junior Member JOURNEYMAN
    Join Date
    Oct 2007
    Location
    Las Cruces, NM
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    29

    Tire shake with P/G

    We have an FED with a blown 542. Our convertor is a JW 10 " and is supposed to stall at about 5,000. We tried to leave at idle and just hit the throttle and it just went into tire shake instantly. We tried to stall it a little and come off the trans brake and it did the same. We don't use a tach so I can't give any stall info there, but the previous 8" convertor we balloned. Any way what my question is, shouldn't there be some slide of the convertor, because it acts like it just locks up period. I am an old lenco guy and am new to this convertor stuff so all you convertor wiz's help me out please. The convertor was just checked by JW before this race.
    Thanks,
    Rick

  2. #2
    Senior Member RACING JUNKIE
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    Mar 2003
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    Fountain,MICHIGAN
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    856

    ?

    Rick,
    I ALWAYS had My BLOWN/Alcohol converter set-up as TIGHT as they could make them!Thats what the Blower is For,........!Sounds to me Like your Tire Pressure is OFF?Or maybe take some B/V away and get After it a little HARDER!!
    Hope that Helps,its NOT Much,but sometimes thats alls YOU Need?
    Later
    G 8)

  3. #3
    Junior Member JOURNEYMAN
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    Oct 2007
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    Las Cruces, NM
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    Yeah, we had it real fat since it was all new, didn't want to cook anything. Did you leave from an idle on your set up or did you nail the convertor and use the trans brake?

    Rick

  4. #4
    Senior Member RACING JUNKIE
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    ?

    Flat FOOT from a Dead IDLE 12-1500 RPMs,that Fat B/V could have ALOT to do w/it.............?
    Later
    G 8)

  5. #5
    Junior Member JOURNEYMAN
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    Oct 2007
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    Las Cruces, NM
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    Re: ?

    Quote Originally Posted by bbchevy
    Flat FOOT from a Dead IDLE 12-1500 RPMs,that Fat B/V could have ALOT to do w/it.............?
    Later
    G 8)
    Thanks for the info, we will lean the puppy out and put a little more timing in it.

    Rick

  6. #6
    Senior Member MASTER BUILDER
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    Dec 2005
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    Napier, New Zealand
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    230
    Tyre shakes caused by not enough power to the ground. If that convertor has a 5000 stall you shouldn't be leaving at 1500. I'd say put a transbrake in there and use that convertor the way its meant to be used.
    It Ain't Over Til Its NOVA - 634ci of S*#t Your Pants!

  7. #7
    Senior Member RACING JUNKIE
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    May 2003
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    Coldwater, MI
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    2,998
    Quote Originally Posted by chevyfireball
    Tyre shakes caused by not enough power to the ground. If that convertor has a 5000 stall you shouldn't be leaving at 1500. I'd say put a transbrake in there and use that convertor the way its meant to be used.
    that is great advice, mine will shake your teeth coming off a idle also.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  8. #8
    Junior Member JOURNEYMAN
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    Oct 2007
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    Las Cruces, NM
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    Well we have tried just about everything, except transbraking it to 5,000. We usually use about 3-4000 rpm. We have tried changing the low end tune up, different tires and tire pressures. The tracks in this area are not the best, but they do prep them pretty good. I guess what I was getting at is that if there is a possibility the convertor is just locking up from the launch, in other words should I send it back and have it set up for a "softer launch" (if there is such a thing). We used to run lencos and could adjust the clutch a little for the shake but I am lost with this convertor/tire shake.

    Rick

  9. #9
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    Location
    central Illinois
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    459

    Tire shack

    It was said above, but how about the combo where they use a tight 1800 - 3000 RPM stall large diameter converter for certain blower applications? I would think using a transbrake with a blower could make tire shake worse.

  10. #10
    Senior Member RACING JUNKIE
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    Re: ?

    Quote Originally Posted by bbchevy
    Rick,
    I ALWAYS had My BLOWN/Alcohol converter set-up as TIGHT as they could make them!Thats what the Blower is For,........!Sounds to me Like your Tire Pressure is OFF?Or maybe take some B/V away and get After it a little HARDER!!
    Hope that Helps,its NOT Much,but sometimes thats alls YOU Need?
    Later
    G 8)
    TIGHT CONVERTER!!!!
    Later
    G 8)

  11. Racing Junk


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