Since were talking timing ?

Discussion in 'PSI Superchargers Tech Questions' started by PROMOD63, Apr 29, 2009.

  1. PROMOD63

    PROMOD63 Member

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    What do you guys recomend for a 540 inch hemi 11:1 with a 1471 hh littlefield we have it at 27 now it is a pro mod running eighth mile
     
    #1
    PROMOD63, Apr 29, 2009
  2. secondwindracing

    secondwindracing top alcohol

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    what heads?
     
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    secondwindracing, Apr 29, 2009
  3. PROMOD63

    PROMOD63 Member

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    It has brad fours
     
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    PROMOD63, Apr 29, 2009
  4. Ken Sitko

    Ken Sitko Super Comp

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    27 or 28 is about the max for Brad heads with a roots blower. Any more and it will start eating up parts.

    The screw blowers can take even less timing, the amount depends on the overdrive.
     
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    Ken Sitko, Apr 29, 2009
  5. J Jackson

    J Jackson New Member

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    24 Degrees with 40psi
     
    #5
    J Jackson, Apr 29, 2009
  6. Mike Canter

    Mike Canter Top Dragster
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    I agree with Ken at 27 degrees being max and maybe 26 being min. Here is the problem with timing on a blown motor you can go less down to 24* and run it leaner or you can go you can go up to 29 and run it richer. I believe the vast majority of us has found that with those heads and about a 11.5:1 compression ration 27* is max for not hurting parts with not much power gained over 27*. There is power loss on taking timing out and going below 26* and that is why we do it on launch for reducing power for traction. The are exceptions to these rules but they should not apply to your setup.
     
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    Mike Canter, Apr 29, 2009
  7. mudmankipp

    mudmankipp New Member

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    ok...im not much different. mine is a 526 with brad fuel heads, 11.3 comp. i was running a screw with this combo at 30 deg. do i still need to be at 26-27 degrees with a msd 44 ?
     
    #7
    mudmankipp, Apr 29, 2009
  8. bruce mullins

    bruce mullins Top Dragster

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    a fuel head has alot bigger chamber than the fat heads, but you should try 28 with that combo. i ran a big chamber head with a screw and ran easier and faster mph at 28 degrees.
     
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    bruce mullins, Apr 29, 2009
  9. mudmankipp

    mudmankipp New Member

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    thanks...gonna give it a try
     
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    mudmankipp, Apr 29, 2009

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