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  • Nitrous tuning questions

    Need some help.

    I have a 351w, 13.86:1 compression, stock vic jr heads, 660 solid roller on a 106.

    Just put some nitorus on the car. Updates the ignition to a msd 7al3.

    Car has 36 degrees total timing.

    Once igniton was installed, timing bumped it self from 36 to 50 degress.

    I reset timing to 36 total at about 2800 rpm.


    Nitrous is a applied tech cross flow plate kit. 200 shot.

    Flowed the the fuel pressure at 10psi

    once spray comes on, msd pulls 8 degrees of timing down to 28 degrees.

    Raced the car the other night, not alot/enough of test time on the spray.

    All motor through 1st and second and then hit the spray once i hit high gear. My tach ligh does not work and it was very dark outside. Once i got toward the end of the race the car felt like it was totally out of power, i was ahead in the race so i cut the nitrous off, and just went in and out of the gas till it was over.

    What i though when power fell off, because i couldnt see the tach was that i just strung it out to far out of the power band.


    Shit running through my head all night, i got up the next day, and made another little second gear poke, and the car literally stops pulling at 5k rpm, runs awesome untill then!

    Then i mad a first gear 1500 to 4000 rpm nos blast, and it felt like i was in a funny car.

    I waont have time to really look at the car / work on it till wednesday. It seems to me like it is totally running out of timing and killing itself around 5k. Car still seems to run fine on motor, but i havn't really been beating up on it since i figured out what it's doing on the spray.

    Anyone had these kind of issues, and think they may know what it sounds like.

    Im gonna reflow the nos fuel pressure on weddesday, and check the plugs and timing again, but im kinda stuck on what it may be.

    Any help would be appreciated.

    Thanks

  • #2
    Also, being that it was really the first all the way through high gear blast, i made sure to keep my eye on the fuel pressure the whole time. No issues there

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    • #3
      what jet are you flowing your fuel pressure thru ? How was your bottle pressure? Check your plugs, you might need to pull a couple degrees of timing out. I had similar issues and blew a head gasket cause I had to much timing and fuel pressure. JMO
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      • #4
        Originally posted by geronimo View Post
        what jet are you flowing your fuel pressure thru ? How was your bottle pressure? Check your plugs, you might need to pull a couple degrees of timing out. I had similar issues and blew a head gasket cause I had to much timing and fuel pressure. JMO
        X2

        10psi of fuel sounds way too high IMO. Also what plug? heat range? Gap? what is the jet spread from nitrous to fuel?
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        • #5
          Originally posted by TrueStreetMotorSports.com View Post
          X2

          10psi of fuel sounds way too high IMO. Also what plug? heat range? Gap? what is the jet spread from nitrous to fuel?
          6 to 1 nitrous fuel ratio.


          10psi is the flowed amount according to my tune sheet, needed for a 200 shot.

          ngk r5671a-9 30 thousanths gap

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          • #6
            950 psi bottle pressure

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            • #7
              What jets are in the system?

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              • #8
                Throw it on a dyno with a wideband. Take the guess work out before you blow it up.

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                • #9
                  no need for a dyno, wide band, or guess work. just a good understanding of what is going on.

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                  • #10
                    Originally posted by JETFAST View Post
                    no need for a dyno, wide band, or guess work. just a good understanding of what is going on.
                    Spoken like someone who knows a thing or two about NAWZ!!!

                    Teach him the way Jet!
                    86 SVO

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                    • #11
                      Originally posted by JETFAST View Post
                      no need for a dyno, wide band, or guess work. just a good understanding of what is going on.
                      Which most people don't. I don't. I would be scared to blow my car up

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                      • #12
                        Originally posted by JETFAST View Post
                        What jets are in the system?

                        it's a cross flow plate

                        59 nos 43 fuel, not looking at them though!

                        it's rite at a 5.8 n to f ratio

                        10 psi flowed fuel.

                        yesterday, i manually pulled the timing doen to 24 degrees, leaving it a few degress to advance, ran awesome, but still ate 4 electrodes off. driver side back 3 looked great. passenger side back 1 looked o.k. Rest were roached after a 1-2 hit on the street.


                        then after this pass i started thinking. Local race car guru hookd up my 7al3, while i was working. Checked the polarity, and the dizzy wires were hooked up backwards. Swithced wire, and reset timing. went and made a motor blast and all felt good. Need to get some andother set of cold plugs before next nos blast.

                        as i was setting the timing, i couldn't tell a differance in motor sound, or ballancer placement when i manually hit the w.o.t switch. which leads me to think the msd isnt doing its job. Thats why i pulled it to 24 manually. But that ws before i switched the dizzy wires.

                        It's coming around, just hope i get it rite before i burn it down!!

                        lol

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                        • #13
                          Originally posted by JETFAST View Post
                          no need for a dyno, wide band, or guess work. just a good understanding of what is going on.


                          also, after talking to my nitrous guy, i have been running 110 octane. he told me to run nothing but vp c16


                          so im gonna get some c16, new plugs, and now the dizzy is rite, but im still gonna manually pull 10 degress of timing out, and try it again!

                          Comment


                          • #14
                            I remeber talking to you a while ago. You called me asking about your set up. I Told you what to do, and also told you it wasn't going to be as easy to tune. You said you would call when you got the retard box on and were ready to spray it @ north star.

                            sounds like you figured it out the hard way. Who's your nitrous guy up there in OK?

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                            • #15
                              Originally posted by 1fast4 View Post
                              Spoken like someone who knows a thing or two about NAWZ!!!

                              Teach him the way Jet!
                              ehh...you can put the shit right in front of them, but you can't allways make'em eat it HAHA!

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