MSD 2 step

Discussion in 'PSI Superchargers Tech Questions' started by planbmotorsports, Mar 3, 2007.

  1. planbmotorsports

    planbmotorsports Member

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    I have seen some of the alcohol cars are running the 2 step rev limiter with the mag 44 at the tree for staging with a clutch. Does anyone have any experience with the cons of using this method and the effects on motor parts with a big boost screw blower setup. Thanks
     
    #1
    planbmotorsports, Mar 3, 2007
  2. dak

    dak Member

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    I'd check with the Promod guys.. I was in Mission this year and the hard running cars all had 2 steps...I videoed a couple of cars and it was weird. Injectors wide open (sounds like a Super cat. car) + dropping cylinders. They were definatley leaving harder than the cars that were swapping pedals.
     
    #2
    dak, Mar 4, 2007
  3. mikeg1055

    mikeg1055 New Member

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    Check the nhra rule book under alcohol dragster transmission section [ includes funny cars ]. It states no automated rpm control device during the staging /launching process allowed . I dont have a current ihra rulebook - dont know what there rules are .
     
    #3
    mikeg1055, Mar 4, 2007
  4. streethot

    streethot New Member

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    have anyone tried with crowerglide?
     
    #4
    streethot, Mar 4, 2007
  5. Mike Canter

    Mike Canter Top Dragster
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    We use a Two Step with a Rootes blower on a ProMod car with no problems. It is very common in the Outlaw ProMod world.


    I can't see why you would use a Two Step on a Crowerglide. I thought you launched those equipped cars from idle????
     
    #5
    Mike Canter, Mar 5, 2007
  6. OwnBlock

    OwnBlock Member

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    Convertor car too ???

    With a convertor car, is this a matter of just plugging it into the rev limiter & setting up a transbrake button, or are more components required I.E MSD 7 or 8 unit ?
     
    #6
    OwnBlock, Mar 5, 2007
  7. Mike Canter

    Mike Canter Top Dragster
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    You can use just the small MSD Two Step box. The difference with using a MSD Digital Box which there are many is that the Digital Box has a soft touch rev limiter which will never stop firing one cylinder twice in a row. It has a program that always picks diferent cylinders. This stop you from loading up cylinders. A regular Two Step Box sounds different than a Digital Box like a Digital 7 unit when on the step.
     
    #7
    Mike Canter, Mar 5, 2007
  8. HEMIdude

    HEMIdude New Member

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    2 steps are prohibitted in IHRA ProMod but allowed in NHRA ProMod. I first noticed this at Indy last year. I couldn't believe my ears at first. Then I asked a few guys in the ProMod pits and they confirmed that I was indeed hearing what I thought I was hearing. I asked a few T/A guys and they say a screw blower would "never leave the line" on a two step.
     
    #8
    HEMIdude, Mar 5, 2007
  9. planbmotorsports

    planbmotorsports Member

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    2 step

    Did they give you a reason why it would not get off the line with a screw blower. I saw Jay Payne using it on his alcohol car at the end of last year and it seemed to help his car but I wanted to make sure that it would not cause me other issues.
     
    #9
    planbmotorsports, Mar 5, 2007
  10. shawn davis

    shawn davis Member

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    2 Step

    The Screw Blown Pro Mods Get Off The Line Ok With Them.
    .975 60' And 2.58 330' And A 3.86 Last Weekend From Hernandez
     
    #10
    shawn davis, Mar 6, 2007
  11. smbs

    smbs New Member

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    2 step

    anyone ever tried with a whipple/lencodrive?
     
    #11
    smbs, Mar 7, 2007
  12. shawn davis

    shawn davis Member

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    2 Step

    Friend Of Mine Runs One On A Whipple W A Clutch, Works Good
    Hugh Scott Runs A Whipple-lencodrive,not Sure If He Runs A 2 Step
     
    #12
    shawn davis, Mar 7, 2007
  13. smbs

    smbs New Member

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    2 step

    shawn, how could I get in touch with these guys?
     
    #13
    smbs, Mar 7, 2007

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