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Forced Induction Turbochargers and Superchargers..Got Boost?

Light knock when rich at 14psi, maybe spark blow out,

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Old Sep 28, 2009 | 03:15 PM
  #21  
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streetzlegend
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Man i really think its high egt's causing it, specially since its mostly with dump closed, or also another possibility is what I was told on my thread with my misfiring issue which was, reversion from the high exhaust pressure.
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Old Sep 28, 2009 | 06:26 PM
  #22  
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You may be right.

The 10 psi coloum is the only one I dont get the false knock with the dump closed. So I am going to start to ramp up the timing on that coloum. Im at 17-18 deg adv and will add more as I go. It feels very strong!

I am going to tune the 14.7psi coloum for use with the dump open only. Right now the timing is 13-15 deg adv, which isnt too bad, I can add more. The AFR with the dump open needs to be richend up since I was tuning it for running with the dump closed. If I still get the knock once thats all straight I may try some race gas just to be sure. If it shows the false knock with the race gas then its boost-a-spark time!
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Old Sep 28, 2009 | 07:22 PM
  #23  
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streetzlegend
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Originally Posted by MardiGrasMax
You may be right.

The 10 psi coloum is the only one I dont get the false knock with the dump closed. So I am going to start to ramp up the timing on that coloum. Im at 17-18 deg adv and will add more as I go. It feels very strong!

I am going to tune the 14.7psi coloum for use with the dump open only. Right now the timing is 13-15 deg adv, which isnt too bad, I can add more. The AFR with the dump open needs to be richend up since I was tuning it for running with the dump closed. If I still get the knock once thats all straight I may try some race gas just to be sure. If it shows the false knock with the race gas then its boost-a-spark time!
Looks like a good plan, with an increase in voltage to the coils my car feels alot more responsive and decreased the misfiring I was having by alot, now that its finally clear from misfires the car feels great, so even if the higher timing clears up the missing for you, I would recommend getting the boost-a-spark anyway, a few more ponies wouldnt hurt no body, except your wallet a lil bit.
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Old Sep 29, 2009 | 12:57 PM
  #24  
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I had the BAS on my Maxima, it works for sure!
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Old Sep 29, 2009 | 01:34 PM
  #25  
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Also, I was going back through my notes and I have my NGK LFR7AIX 2-step colder plugs gapped at .032 , I guess I can try to close them down to .025ish and see if that helps.
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