You cannot add enough fuel for a NOS application with the accelerator pump. All it does is add a little bit extra fuel for just a split second. It will not add any fuel over a sustained period of time. Adding fuel with AP is useless with NOS.
You have three possible easy solutions:
1. The best solution is to use the MPS box. You will have all the extra fuel you need only when you need it. Once it is properly tuned on NA and with NOS you can forget about it and never touch anything.
2. Add enough extra fuel at 100% throttle on your power commander in the rpm range you will be using NOS. The only drawback to this solution is that you will have extra fuel when not using NOS and you will be down about 5 HP when running NA. You could make two maps, an NA map and a NOS map. Then load the appropriate map when needed.
3. Add fuel with PC3 by using the bars. Adjust high setting only. Depending on how much NOS you use, you will end up going about 2-3 bars richer. You effectively have two easily changed tune-ups. When on the juice bump it up and when running NA bump it back down.
Whatever solution you use, you must put it on the dyno and get an AF reading. You have no idea if your stock fuel system or if your method of adding fuel are actually working correctly. I've seen to many faulty stock fuel systems and too many faulty fuel adders. You must verify everything.
If ya don't get it on the dyno, you'll either get lucky or you'll be sorry...
Here's a few dyno runs of my '03 Busa. Engine mods are: Muzzy pipe, PC3R, and a dry shot.
Air temp was cool, so bottle pressure was only 650-700 PSI. Should make a hair more power with warmer bottle and increased pressure - and could require a little more fuel when running the larger NOS jets.
I made a custom map for NA and then added fuel for NOS by richening the high button 3 bars on the PC3R, and remained at that setting for all NOS runs. When the motor was running NA with 3 bars it ran OK (didn't hesitate, or missfire - felt about the same). But, with the over rich condition it lost 3-5 HP. Four bars really killed the NA power.
The AF was good and safe by simply richening it with the bars. I did it this way for the convenience of switching tune-ups between NA and NOS runs by using the buttons instead of dragging a computer along to change maps while at the dragstrip. Since I had it on the dyno and monitored the AF, I knew what the results would be when I changed it at the track. On the juice at 64" wheelbase it ran 9.03 @ 153.
If you install a NOS system on your bike you might not get the same results by tuning it with the bars - every bike performs a little differently. You still need to get it on a dyno and check the AF while on the juice. You don't know if everything is working as it should be unless you check it.
In the following dyno runs, Nos was activated at 7,750 rpm and shut off at 10,000 rpm. Here's the details:
203 HP - 36 jet...A/F 12.5 3 bars rich, high button
196 HP - 32 jet...A/F 12:1 3 bars rich, high button
192 HP - 28 jet...A/F 11.8 3 bars rich, high button
187 HP - 24 jet...A/F 11.5 3 bars rich, high button
166 HP - NA.......A/F 13.0 0 bars
163 HP - NA.......A/F 11.0 3 bars rich, high button
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