Forced Induction Turbo Installed, Black Plugs And Fuel Smell...

Discussion in 'Fox 5.0 Mustang Tech' started by madspeed, Aug 11, 2013.


  1. 84Ttop

    84Ttop They make new pistons every day, so why worry?
    SN Certified Technician Mod Dude

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    Yes, with ngk the higher number equals colder plug. The more cylinder pressure the colder the plug needs to be.

    Your Bov is more than likely your running rich problem. This needs to be recirculated to a point down stream of the maf on a car still equipped with a maf. All of the air that is taken into the engine is accounted for by your maf. When you vent some of the air it has already been accounted for by the computer which fuels your engine accordingly. So now you have less air going to the motor and more fuel. In essence you make a wot pass down the strip, top of the track your throttle blade closes and bov opens venting the excess pressure. The air that you were ingesting into the motor was counted and you're still fueling the motor as if it's ingesting all of that air. This leads to fouled plugs and a rich condition every time. The a/f will look good on accell but will go pig fat on decell. I hope my explanation makes sense, if not let me know.

    Sharp looking setup you have there, btw.
     
    #21
  2. madspeed

    madspeed Colonel Mustard
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    Ok, great. Guess i'd better start reading up on how others piped the bov in! So just to clarify, it should be plumbed in after the maf and before the throttle body, correct?
     
    #22
  3. f8tlfiveo

    f8tlfiveo My wife likes my spool and blow-off valve.

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    Why can't the bov be before the maf? Then it would be venting unmetered air.
     
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  4. madspeed

    madspeed Colonel Mustard
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    actually not, as it was already entered into the system pre maf
     
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  5. madspeed

    madspeed Colonel Mustard
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    Damn, I guess you need them with that much boost?

    This is copied from the Turbo Forums...


    Aftermarket aluminum heads (TFS, Edelbrock, AFR, Canfield, Brodix) NGK Forced Induction
    R5671-A8 Stock Number 4554, 1 heat range Colder (up to about 600rwhp)
    R5671–A9 Stock Number 5238, for 18+psi, 2 heat ranges colder 650+ rwhp
    R5671–A10 Stock Number 5820, for race cars.

    Read more at: http://www.theturboforums.com/threads/281795-Spark-Plug-FAQ
     
    #25
  6. 84Ttop

    84Ttop They make new pistons every day, so why worry?
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    Exactly!

    I modify that general rule of thumb personally.
    -8 All motor
    -9 Boost up to 12lbs or Nitrous up to 150
    -10 Everything else

    I know a lot of guys that run the -8's and -9's in other stuff and have no trouble. We just switched my buddy from autolights to -10's is a stock block 302 tfs top and 175 shot and he just made his best passes ever. 1.47 60' and 10.79 We pull #1 on his every pass to check a plug and these burn so much nicer than the autolights he was running before.

    How was the new tune you got from willie?
     
    #26
  7. madspeed

    madspeed Colonel Mustard
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    Got the tune loaded, but not ran yet, fricken rain here...
     
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  8. HotFox

    HotFox Active Member

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    NGK has a great tech line. Call them I always call them any time I have a question on the more nontraditional stuff. They will ask for compression ratio and boost and recommend a plug and gap.

    Scott
     
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  9. David Pepiton

    David Pepiton Active Member

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    yeah running rich for sure I would go with the -10's and get some time on the dyno with an extra set or two of plugs.
     
    #29
  10. madspeed

    madspeed Colonel Mustard
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    @84Ttop,

    " Your Bov is more than likely your running rich problem. This needs to be recirculated to a point down stream of the maf on a car still equipped with a maf. All of the air that is taken into the engine is accounted for by your maf. When you vent some of the air it has already been accounted for by the computer which fuels your engine accordingly. So now you have less air going to the motor and more fuel. In essence you make a wot pass down the strip, top of the track your throttle blade closes and bov opens venting the excess pressure. The air that you were ingesting into the motor was counted and you're still fueling the motor as if it's ingesting all of that air. This leads to fouled plugs and a rich condition every time. The a/f will look good on accell but will go pig fat on decell. I hope my explanation makes sense, if not let me know. "

    my a/f looks good on accel, and goes lean as expected on decell. Im installing new plugs this evening and will do some datalogs
     
    #30
  11. 84Ttop

    84Ttop They make new pistons every day, so why worry?
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    I would be interested to see one of your data logs if you don't mind sending me one.
     
    #31
  12. madspeed

    madspeed Colonel Mustard
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    I'll be installing new plugs today and will take a few datalogs with the updated tune.
     
    #32

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