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some nitrous dyno testing

This is a discussion on some nitrous dyno testing within the Nitrous forums, part of the LSx Technical Help Section category; last friday, i did some testing comparing ny-trex to nx. got to wondering why nx says .063/.033 jets was 150 ...

  1. #1
    Senior Member mrr23's Avatar
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    some nitrous dyno testing

    last friday, i did some testing comparing ny-trex to nx. got to wondering why nx says .063/.033 jets was 150 rwhp and ny-trex says 150 motor. got some feedback on ls1tech. then nx sent me a nozzle to try out. then spiraled from there a little.

    http://www.stealthram.com/nxnytrex.htm

    test #1 nx vs ny-trex nozzle
    only change was the nozzle. nx made 8 rwhp more. noticed the nx nozzle also leaned the mixture out by a half of a point. which leads to test #2

    test #2 nx (.063/.033) vs ny-trex (.062/.031)
    this brought the two setups to the exact same a/f ratio. nx still made 3.5 rwhp more. minor in the big scheme of things. still was nowhere near the 150 rwhp. nx = 115 rwhp ny-trex = 111 rwhp

    test #3 small solenoid (.081 orifice) vs large solenoid (.125 orifice)
    the main difference between nx and ny-trex was the n2o no id. nx supplies a larger one with their kit. this netted some interesting results. by only swapping to the larger solenoid and using the same .062 n2o jet, i gained 18.5 rwhp. i know doesn't make sense why you would make more when the small solenoid orifice is bigger than the jet you are using. two things come to mind. one, the orifice is freezing up and making the hole smaller. two, is an equation that you can only flow about 80% jet to orifice size.

    test #4
    seeing the larger solenoid also leaned the mixture out more, i put the .033 fuel jet back in. made about 5 rwhp less.

    test #5
    i went back and did the same test as in #1. went to the nx nozzle to see what would happen. again, nx nozzle made 6.81 rwhp more. but, at the expensive of leaning the mixture out. I could have run another test making the A/F ratio the same for both nozzles, but using what was found out in test #2, it would have made it about even.

    NA vs test #5 shows just that. NA vs n2o runs. nx = 131.48 gain ny-trex = 124.67. again, at the expensive of leaning the mixture out.

    overall, nozzles are within 3 rwhp when a/f ratio is the same. looks like you'll never get 100% flow out of a solenoid.

    still missing about 22 rwhp off the .062/.033 jetting nx says is 150 rwhp. which leads us to the next round of testing. nx is sending me one of their n2o solenoids and bottle valves. Ricky says the side in/bottom out design is better flowing than the traditional side in/side out that many use. we'll see.
    Last edited by mrr23; 01-16-2006 at 07:02 PM.

  2. #2
    Senior Member ss~zoso~ss's Avatar
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    dam your car must be beat with all these tests

  3. #3
    Senior Member mrr23's Avatar
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    still kicking. and i've got another 20 rwhp to get me closer to the tens.

  4. #4
    Off topic, but is there anywhere on your site where all your mods are listed?

    Thanks,
    somebody

  5. #5
    Senior Member mrr23's Avatar
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    i don't have a cliff notes version. i need to make one for both. give me a few minutes.

  6. #6
    Senior Member mrr23's Avatar
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    ok. click the links in my sig and you'll see the total mods i've done to both cars on the front page.

  7. #7
    Registered Player brad8266's Avatar
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    My NX 150 shot actually only gained me about 125RWHP, me having the bottle PSI at 900 probably wasnt helping either.

  8. #8
    Senior Member mrr23's Avatar
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    yeah another 150 psi can make a difference.

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