calculating nitrous
10-30-16, 05:47 PM
#1
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calculating nitrous
I run a 50-150hp plate system on my BP 12a.
Was curious on who's nitrous chart to believe on what kind to power to expect from various pill combinations.
for instance one says
N: .047, F: .053 = 100 hp
N: .063, F: .071 = 150 hp
but that is based on a piston engine.
I would like to hear your thoughts.
Was curious on who's nitrous chart to believe on what kind to power to expect from various pill combinations.
for instance one says
N: .047, F: .053 = 100 hp
N: .063, F: .071 = 150 hp
but that is based on a piston engine.
I would like to hear your thoughts.
02-08-17, 01:21 PM
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Those are some fudged up nitrous pill combos compared to what I am looking at, if fuel pressure is much less than 43psi that makes sense. Not sure on rotary but for a 75 shot single fogger plate style for piston EFI import engines, it's 42N to 22F.
02-08-17, 01:27 PM
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http://www.nitrousexpress.com/oldweb...ortjetting.pdf
Shows a good list of different cars including FD rx-7. shows that they run a little bit more fuel than piston engines but this looks to be caused by a lower fuel pressure.
Really shouldn't be much of a debate as your goal AFR (Air Fuel Ratio) regardless of engine type. I would check your fuel pressure at WOT Mid/high rpm do calculation form your pressure to one on the chart and use that jetting.
If your worried about it just put a .001 bigger fuel jet in at that point.
Shows a good list of different cars including FD rx-7. shows that they run a little bit more fuel than piston engines but this looks to be caused by a lower fuel pressure.
Really shouldn't be much of a debate as your goal AFR (Air Fuel Ratio) regardless of engine type. I would check your fuel pressure at WOT Mid/high rpm do calculation form your pressure to one on the chart and use that jetting.
If your worried about it just put a .001 bigger fuel jet in at that point.
02-09-17, 11:37 AM
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Sorry rotary should be a little richer in Afr's, sure there is a calculation you could do for target AFR with Nitrous jets.
Nitrous Oxide fuel Jet size and HP Calculator nos n2o
How ever doesn't give you an AFR target
Nitrous Oxide fuel Jet size and HP Calculator nos n2o
How ever doesn't give you an AFR target
06-06-17, 08:16 AM
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MY sand rail (632# dry weight) has a full bridgported 12a in it by Wankelworks.
Ported racingbeat intake, 700 cfm Holley HP 4-bbl carb.
Snowmobile clutch drive, idles at 3800 rpm's, clutch engages at 5500-5800 rpm's. Runs the track at 10,000-10,400 rpm's on the rev limiter.
Current tune up:
Running C10 race fuel with Amsoil Dominator 2 stroke oil mixed at 10 oz per 5 gallons
Have 4 coils mounted firing all at once. Timing is locked at 18 degrees. I turn the power on, retard 4 degrees to start, then retard an additional 4 degrees before running.
Fuel pressure is at 6.5 psi.
It pulls 12-14" of vaccum at idle (measured at 2400-2600 rpm's), it has a 10.5 power valve in it.
Primary side has .068 jets and a .028 squirter, black cam with a 25cc accelerator pump, the secondary side has .076 jets and a .025 squirter, red cam with a 50cc accelerator pump.
Nitrous has .052 N / .048 G jets in it. Hitting the nitrous manually after the tach hits 6-7000 rpm's.
Idle is still not high enough to launch hard. Working on clutch tuning to raise idle and pull the motor down more.
Ported racingbeat intake, 700 cfm Holley HP 4-bbl carb.
Snowmobile clutch drive, idles at 3800 rpm's, clutch engages at 5500-5800 rpm's. Runs the track at 10,000-10,400 rpm's on the rev limiter.
Current tune up:
Running C10 race fuel with Amsoil Dominator 2 stroke oil mixed at 10 oz per 5 gallons
Have 4 coils mounted firing all at once. Timing is locked at 18 degrees. I turn the power on, retard 4 degrees to start, then retard an additional 4 degrees before running.
Fuel pressure is at 6.5 psi.
It pulls 12-14" of vaccum at idle (measured at 2400-2600 rpm's), it has a 10.5 power valve in it.
Primary side has .068 jets and a .028 squirter, black cam with a 25cc accelerator pump, the secondary side has .076 jets and a .025 squirter, red cam with a 50cc accelerator pump.
Nitrous has .052 N / .048 G jets in it. Hitting the nitrous manually after the tach hits 6-7000 rpm's.
Idle is still not high enough to launch hard. Working on clutch tuning to raise idle and pull the motor down more.
Last edited by chainreaction; 06-06-17 at 08:25 AM. Reason: added tune up detail