blown 540 bbc need help with tune up any guru's out there??

Discussion in 'PSI Superchargers Tech Questions' started by ratchett13, May 20, 2012.

  1. ratchett13

    ratchett13 New Member

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    im new to the blown alky and this thing is kicking my but here is what im running
    540 bbc with brodix bb2 heads 11.7 comp. enderle 990 pump buzzard catcher
    running 6-56nozzles in the hat 4-40 in the rear of the blower,
    port nozzles are 1-42,2-46,3-8 are all 40 running 30' timing
    i got a 145 pill on the main return and a 90 on the high speed does this sound like a good tune up compared to what you guys are running or ? also blower is a 14-71 kuhl
    at 21% over the plugs dont seem to be getting any heat at all. im tired of going to the track and looking like a dummy thanks in advance guys for the help.
     
    #1
    ratchett13, May 20, 2012
  2. snrub47

    snrub47 New Member

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    More info...

    What type car? Transmission? Ignition? Boost?
     
    #2
    snrub47, May 20, 2012
  3. ratchett13

    ratchett13 New Member

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    info

    2600lb door slammer,supermag 4,20lbs,glide
     
    #3
    ratchett13, May 20, 2012
  4. Mike Canter

    Mike Canter Top Dragster
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    Where do the EGTs peak at the end of the run? Is this a HH blower or a standard helix blower. How much boost are you seeing at 8000 in high gear, what is the peak boost seen? If you use new plugs and don't see any cadium burn off the base circle at the end of the run then I would lean it out by ten sizes on the main jet until I could see the cadium start turning grayish white. then lean them out 5 sizes at a time until I had about 3/4 burn. If that makes your main jet too big then you need a pump sizer loop with about a 35-38 lb poppet in it.
     
    #4
    Mike Canter, May 20, 2012
  5. ratchett13

    ratchett13 New Member

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    don't have any egt sensor,it's a regular helix blower
    making around 20lbs boost@7500( but I really havnt got
    any good runs out if it)
     
    #5
    ratchett13, May 20, 2012
  6. Mike Canter

    Mike Canter Top Dragster
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    #6
    Mike Canter, May 20, 2012
  7. ratchett13

    ratchett13 New Member

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    yes sir I have read that article and it's great!! thanks
     
    #7
    ratchett13, May 20, 2012
  8. B.DOUCET

    B.DOUCET New Member

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    Thats a big pump and lots of nozzle area for 20# of boost. You will need a pump loop and a reduction in some of the nozzle jets to use a 990.
     
    #8
    B.DOUCET, May 20, 2012
  9. Relentless

    Relentless www.bretitanium.com

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    The way I read it, too much fuel in the hat. Reduce those .056"'s to say .050" try a pass then if needed reduce again to .048" then .046"

    Reducing these hat sizes from 0.01980 sq in (using the .056") will also up your total system pressure.
     
    #9
    Relentless, May 21, 2012
  10. SoDak

    SoDak Active Member

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    IMO its too much fuel. I agree with the above and when does your high speed open?
     
    #10
    SoDak, May 21, 2012
  11. bandit496

    bandit496 Member

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    We run pretty much the same setup--two 540 BBC with BB2-X, Mallory IV and 35 to 40 degrees of timing (depending on track conditions). We run 46.5% overdrive. We run a 175-2 pump and the hat nozzles go from 46 in rear to 52 in front with two in the back of the Littlefield HH and the same hat setup on the SSI straight blower. The port nozzles run from 38-40 in #7 & #8, to high 60's in #2 (our problem cylinder). The middle ports are in the high 40's to low 50's. #1 cylinder is like a 62 or so. The main jets are around 100-120 depending on weather. This gets a good 3/4 burn (which is safe). I don't run a high speed or loop. But then, we tractor pull so we are at WOT a while longer, but it is still blown alcohol. JW
     
    #11
    bandit496, May 21, 2012

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