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  • So what exactly causes a nitrous backfire?

    http://www.need2speed.com/Movies/ls1...o%20blows.mpeg

    Cool video of one, I know they happen. But what causes it? Whent he motor is fireing do the intake and exhasut valves work close enough to each other that flame remains in the cylinder enough to seap back out when the intake valve re opens?

    Then I assume the spark just follows the juice back through the TB and LID.

  • #2
    <--- dial up at home so I won't even bother with the vid.

    If you are not WOT then BOOM
    If fuel puddles then BOOM
    If you spray as you are down shifting then BOOM

    You have an intake manifold completely full with atomized fuel and raw nitrous oxide, it is begging to just light up and boom!
    Race car - gone but not forgotten - 1997 firebird V6
    nitrous et & mph: 12.168 & 110.95 mph, n/a 13.746 & 96.38 mph
    2013 Dodge Challenger SRT8: 12.125, 116.45
    2010 Ford Taurus SHO: no times yet

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    • #3
      would it be safer to go WOT still for a bit after a n2o run just to play it safer?
      Mods: <br />MAF! removed, KN filter, 2.5 Flowmaster American Thunder Catback, and this week a NX system thanks to 12secdream. Carsoud cat in the mail. Cutout with qtec cover in the mail.<p>soon to come:<br />3.42\'s or 3.73\'s depends on price of reprogram, LSD, LCAs, 1 inch drop, turbo/SC not decided yet, Cam, rockers. I HATE MY V6, IM A SELF HATING V6 OWNER! MAYBE ILL JUST SELL THE V6 FOR A V8. I THINK NOT!!!!! BACK OFF!!!!! THIS V6 IS GONNA TEAR YOU A NEW ***

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      • #4
        Hi... I'm a newby to nitrous but I had a backfire because it was very very hot one day and I had been on somewhat of a road trip (4 hours)... It was a small backfire that undone some rubber couplings and partially opened my filter box but DAMN it was loud... Scared the shift out of me!

        Other than that 12secv6 covered everything...
        Fire Red 98 Firebird 3.8 Series II Auto (Project)<br /> NOS 5175 85 Shot, K&N, Flowmaster<br /> Always 92+ Premium and NOS Octain Boost<p>Silver 00 Jaguar Type-S 3.0 (Daily Driver)<p>Silver 92 Mazda Navajo (Toy Hauler)

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        • #5
          <blockquote>quote:</font><hr>Originally posted by IThinkImFast:
          would it be safer to go WOT still for a bit after a n2o run just to play it safer?<hr></blockquote>


          Yup, let off the nitrous, then throttle.

          Not both at once
          Race car - gone but not forgotten - 1997 firebird V6
          nitrous et & mph: 12.168 & 110.95 mph, n/a 13.746 & 96.38 mph
          2013 Dodge Challenger SRT8: 12.125, 116.45
          2010 Ford Taurus SHO: no times yet

          Comment


          • #6
            So say on a M5, you only have a WOT switch and you are cruising at 4 in 4th, then someone wanted to race so you arm everything and you only have a WOT switch, can you down shift into second without going "boom"

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            • #7
              I would think you would shift down to 2nd then hit the juice, but I woudl not do it in the upper rpms...

              btw another nitrous backfire video

              http://www.reevesracing.ca/video/backFire.WMV


              This one is cooler and involves a stang [img]smile.gif[/img]

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              • #8
                its because wet kits sometimes cause the fuel to puddle in the intake manifold, and for the split second there is valve overlap it can ignite the mixture in teh intake and BOOM.

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