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bogging at 4500 rpm

Discussion in 'Forced Induction' started by sil180drifter, Aug 26, 2003.

  1. sil180drifter

    sil180drifter Junior Member

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    i just encounter another problem. until i get it dynoed does anyone have any clue on this subject. currently the fpr is at 45 psi and the fmu plat is the 12:1. today was the first day i actually drove the car to past 3000 rpm (was trying to go to redline) but right when i hit 4500 the car suddenly kinda surges not real big surges but small kinda bogging. im thinking its the fmu raising my fp even higher then 45psi and thats why its bogging but the thing that confuses me is that i get full boost at 3000-3500 wouldnt it bogg then. oh another thing is that i set the plug gap at .035 just a tad bit wider then stock should i set it wider. if anyone know shed some light.
     
  2. pissedoffsol

    pissedoffsol RETIRED

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    put your fpr back to 38-40. you are prob flooding it once the transition from vacuum to boost happens. also, where you are getiing you vacuum source for the boost gauge might be reading differently than what your fuel is getting, so it gets screwy,

    as for plugs, http://ngkaz.home.att.net/wsb/html/view.cg...home.html-.html
     
  3. sil180drifter

    sil180drifter Junior Member

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    yea ill try lowering the fp and the boost is tap into my intake manifold
     
  4. sil180drifter

    sil180drifter Junior Member

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    thanks that helped out alot it doesnt bogg anymore but i know that im still running way to rich got to get it tuned soon.
     
  5. pissedoffsol

    pissedoffsol RETIRED

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    werd. if you have a vafc, and you KNOW you are running rich, drop it down 1-2% across the range in the meantime. just don't go too much and lean out
     
  6. sil180drifter

    sil180drifter Junior Member

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    the thing about the vafc is that when you lower it too much it advances the timing on the car so im at like only at -10% and on the fmu i swithced the plates to the 8:1 and also turned down the fuel pressure to like 29. it still running rich cause my afr gauge is at the rich zone( not the fucked up autometer one) and i can smell gas , on top of that im only doing like 15 - 20 mph. i dont really want to go way to lean so im thinking about keeping it this way until i have a real prfessional look at it on the dyno with a lamda meter.
     
  7. pissedoffsol

    pissedoffsol RETIRED

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    how so? a VAFC has zero control over timing.
     
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