MSD points box rev lim or not?

Discussion in 'PSI Superchargers Tech Questions' started by M Tigges, Nov 8, 2004.

  1. M Tigges

    M Tigges TAFC

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    I noticed some prefer not to run the limiter box any reason why?
     
    #1
    M Tigges, Nov 8, 2004
  2. aj481x

    aj481x Member

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    It seems like a good idea to me. We have used them for years and "bumped" it many times.
     
    #2
    aj481x, Nov 8, 2004
  3. john348

    john348 Top Alcohol

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    with non-limiter only $100 cheaper i can see no reason why you would not run the limiter box
     
    #3
    john348, Nov 8, 2004
  4. Mike Canter

    Mike Canter Top Dragster
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    My understanding is that the MSD Points Box without the rev limiter is normally for Top Fuel guys because they never use a rev limiter. I cannot even comprehend a blown alcohol with a Lenco not having a rev limiter to protect the motor if a sprag goes bad or you break and Lenco input shaft or you lose a driveshaft or rear end or or or or.
     
    #4
    Mike Canter, Nov 8, 2004
  5. flash

    flash top alcohol

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    rolled a sprag at last div race,had a 10400 high side chip in msd box,computer told us the motor went to 10359,then stopped!! I will never run a alcohol blown motor without a rev limiter,it's cheap insurance to keep damage under control!!
     
    #5
    flash, Nov 8, 2004
  6. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    some believe that the rev control creates a potential problem. those of you that read here regularly have heard of stories from me and other racers of control boxes going bad. some associate that with rev control boxes. also the teams that choose to rev one higher, the rev chip starts hitting about 4-600 rpm away from the chip. so if you're really trying to rev one up, you may not want it to hit the chip.

    as for me, yall are preaching to the choir. i'm a big advocate of a rev limiter.
     
    #6
    Will Hanna, Nov 9, 2004
  7. M Tigges

    M Tigges TAFC

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    I was just thinking some thought the limiter side would foul up sometimes. maybe screw up a run here or there. pitch the belt etc.
     
    #7
    M Tigges, Nov 9, 2004
  8. Mike Canter

    Mike Canter Top Dragster
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    The only thing that I have ever seen go wrong is sometimes (not often) a plugin chip changes value due to age or heat and changes the rpm set point. They are easy to read with multimeter and to compare the resistence with a new one.
     
    #8
    Mike Canter, Nov 9, 2004
  9. Dragster503

    Dragster503 Dragster

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    How is MSD's limiter compared to PSI's? Just curious, we have have the MSD points box with the limiter and havn't heard much about PSI's.
     
    #9
    Dragster503, Nov 11, 2004
  10. ROF

    ROF Top Dragster

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    Lencos roll a sprag. That hardly never happens ;) .

    The rev limiter is a must for a TAFC with a Lenco.

    Question for the B&J users. Do B&J transmissions roll sprags as easy as the Lencos?
     
    #10
    ROF, Nov 11, 2004
  11. Jeff Wilson

    Jeff Wilson New Member

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    Rolled 1 in 9 years. And that one was the drivers fault
     
    #11
    Jeff Wilson, Nov 11, 2004
  12. M Tigges

    M Tigges TAFC

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    We never have ethier! good maint.
     
    #12
    M Tigges, Nov 11, 2004
  13. Mike Canter

    Mike Canter Top Dragster
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    If you measure the width of the flat spot on the teeth where it makes contact with the inner race and never let is get wider than .075 without changing it will help the reliability. The other thing to check carefully for scoring is the inner hub that the teeth rotate around. Tire shake really takes its toll on the first section sprag.
     
    #13
    Mike Canter, Nov 11, 2004

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