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  1. Fuel Injector Duty Cycle Explained on Youtube

    I just posted a new Youtube video regarding Pulse Width and Maximum Duty Cycle.

    I hope this will help people get their head around how all of this is stuff tied together.



    ...
  2. I posted a tuning video on my Youtube Channel

    You guys may be able to apply some of the info I posted in this video.

    https://www.youtube.com/watch?v=CG_kY3K_2AE

    Have fun tuning

    Andy
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    I posted a few new videos. Lots of this stuff...

    I posted a few new videos. Lots of this stuff applies to systems you guys use.

    https://www.youtube.com/c/AndyWhittle_HowEFIworks

    Andy
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    Thanks Greg Please subscribe. I need to get...

    Thanks Greg

    Please subscribe. I need to get to 100 subscribers.

    I can do some reading VTech and Motec logs if you guys want.

    Andy
  5. You need 43 to about 48 PSI more pressure in the...

    You need 43 to about 48 PSI more pressure in the rail that you have in the intake and you need consistent pressures at any point in the power band. My stock FPR holds about 59 PSI at idle and fades...
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    GPS has about a 1 sec delay. I found the stock...

    GPS has about a 1 sec delay. I found the stock Seadoo GPS was very consistent as logged by either VTec or Motec.

    http://www.nbs-stl.com/motec/0%20to%2060%20in%204%20Motec.png

    Andy
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    Would you go with the automatic electric...

    Would you go with the automatic electric controlled valve?
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    Don't worry about Nils, his balls always itch. ...

    Don't worry about Nils, his balls always itch. He needs to see a doctor.

    Yes, the Motecs just work. Easy to tune. Nils, Evan or I can dial them right in. And most of the time, we don't even...
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    The trick is fairly simple. The first thing you...

    The trick is fairly simple. The first thing you have to do is create the field

    Time

    In Vtech, You have to define it as

    [Timestamp]

    Most systems I mess with has vehicle speed included in...
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    If the motor is still running, disconnect the the...

    If the motor is still running, disconnect the the wires as they enter the fuel pump and fuel level sensor and then start the motor. It may run for a few sec till the pressure is almost gone.

    Andy
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    Exhaust leak below water level. The exhaust in...

    Exhaust leak below water level. The exhaust in the hull kills the motor due to a lack of O2. Boat sinks due to the failure being below water level.
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    Your question is a little early. The tunes are...

    Your question is a little early. The tunes are coming but testing is still ongoing.

    Andy
  13. http://www.c-f-m.com/performanceparts/pc/5-16-Fuel...

    http://www.c-f-m.com/performanceparts/pc/5-16-Fuel-Pressure-Gauge-Nitrous-Adapter-Fitting-with-1-8-NPT-Port-86p118.htm

    I have a remote digital gauge I screw into that thing located right before...
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    The cool stuff is seldom cheep, but it is cool. ...

    The cool stuff is seldom cheep, but it is cool. I have had something like $20000 in electronics alone on my ski in the last three years. All worth it. Right now, it is has about 1/4 of that value...
  15. See...

    See http://www.greenhulk.net/forums/showthread.php?t=240421 for lots more info.
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    I use this ...

    I use this

    http://www.nbs-stl.com/RxpxTuning/DSC02067%20%28Medium%29.JPG

    http://www.nbs-stl.com/RxpxTuning/DSC02058%20%28Medium%29.JPG

    Built from an ebay turbo air horn and a Walmart...
  17. As long as you have the correct injectors and...

    As long as you have the correct injectors and keep the boost under 18 psi, the stock pump is good to go. Just keep an eye on the HP goes up with mods. At some HP point the pressure will start to...
  18. If you dont have Excel at home, here is a screen...

    If you dont have Excel at home, here is a screen shot of the Sheet

    Maximum acceptable duty cycle to allow reliable fueling

    Injector Reset Time (ms)
    ________3__________

    ________RPM____Max...
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    Here...

    <<<<<<<< Warning Geek Alert >>>>>>>

    Here is a interesting formula for Max Allowable Injector Duty Cycle

    100*((120000/[RPM])-3)/(120000/[RPM])

    6000 RPM returns 85% Max DC Note 85% is...
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    Tell them you need the name of their insurance...

    Tell them you need the name of their insurance carrier. That is the guy you want there as you present the issue to them.

    They elected to save time, not water test it in the interst of profits. ...
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    Assuming the calculators are correct at that...

    Assuming the calculators are correct at that level, that works out to 438 HP.

    That works out to 4.8 HP per CI. WOW
  22. 8040 is the stock top speed RPM. It is a Coast...

    8040 is the stock top speed RPM. It is a Coast Guard thing.
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    Just for the record, If I was to build another...

    Just for the record, If I was to build another 2012-15 ski tomorrow it would have a Fizzle or the new 2016 intercooler on order real quick. I would also get the oil out of the intake. I have seen...
  24. Borrow the logger and get a log posted up on the...

    Borrow the logger and get a log posted up on the Vtech server and lets see how it is running now.

    Tell Jonatan you want a copy of my 117 tune that is opened up. Tuning is the fun part.....

    Andy
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    Keep in mind that max Boost is very RPM...

    Keep in mind that max Boost is very RPM sensitive. And max RPM is very Boost sensitive. Both are very prop sensitive. Everything is also air temp sensitive.

    You will chase yourself in circles a...
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