robino said:
Dale, so are you saying nitrous should activate somewhere in the 3500-4000 rpm range and die off somewhere in the 5500-6000 rpm range? RPM window switch?
also be a bit more clear on the "lifting your foot off the gas slowly" letting the system close.
i'm getting this same exact system (NX 75 shot wet) with the rpm window switch, bottle blanket, etc...just curious to learn more about driving it and how it will react so i know what to expect.
It's very rare that any real nitrous user will offer advice on specific jetting sizes or rpm points because it's very easy for newbies to ruin cars with other peoples settings.
I am saying that if you look at a 'known safe' dyno plot, and overlay your current dyno plot (assuming both are numbers at the wheels or at the crank), you can get a really good idea of how far you can go safely. If you want to engage the solenoids at 3500 rpm, look at the difference between the two plots at that RPM and that is the amount of nitrous you *should* be able to safely run without running dangerous cylinder pressures at that lower rpm.
The upper RPM is really a measure of your fortitude. As long as you aren't juicing when you hit the rev limiter, ever, and you never hit a fuel cut, ever, you should be fine.
With regard to 'lifting', when the solenoids turn off, there is still high pressure nitrous in the line between the solenoid and the engine. There is also fuel being sent with it. If you snap off the throttle, the throttle blade slams shut, and you have nitrous and fuel flowing into the cold charge pipe with nowhere to go but the intercooler.... The WOT switch that you will use to arm the system and keep it from acidentally coming on at idle when one of your bonehead friends pushes the button while you're in the drive-thru lane at Burger King suddenly is the cause of possible problems when combined with a bonehead driver... When you finish your pass under nitrous, lift a little, even if you've disabled the system at the 'master arm' or momentary thumb switch, so that you will still be flowing a lot of intake air through the system to hopefully pick up the excess nitrous and fuel that shows up after the solenoids shut. You'll feel the system wind down, it's pretty cool...
Beginning nitrous users should budget for a new engine before installing their kit. Not because nitrous is dangerous, but because beginners are dangerous...