RENE'S RAGE

iTrader: (96)

My car pulls to 7500 now, N/A. Will a 200 shot increase my rpm's?

k_garretson23

iTrader: (8)

depends on the cam. nitrous hits instantly with torque a nitrous ground cam will carry that torque across the power band instead of it dropping off after the initial hit.

HCI2000SS

iTrader: (2)

In my case the hp peaked a tad sooner on the nitrous

speedtigger

iTrader: (16)

I have never seen nitrous have RPM increasing effect like forced induction can. I can tell you that it will make your car RPM so fast that you are late on the shift though. LOL

I usually treat my shift points and terminal RPM just like I do N/A. Some folks proclaim they get better results short shifting their engines on nitrous.

RENE'S RAGE

iTrader: (96)

May have to get an air shifter!

1970camaroRS

iTrader: (8)

For me, my cam is not the best for nitrous and I lowered my peak HP rpm by about 400rpm on a 150 shot. Power also took a hard dive after that compared to how it carried 600-700rpm without it.

NOS LS1

iTrader: (3)

YES ! You can Run Numerically Lower rear gears when using Nitrous. Nitrous will make your Motor Spin Faster.You could possible run out of gear at the Far end of the track while on the juice. 60 Foot times usually increase with lets say 3.73 gears vs 4.10 gears while on the juice. A 150 shot will make close to 200 additional Ft. Lbs. of Torque

Hardcoresoldier

iTrader: (2)

I am looking forward to the challenge of manual shifting on a 300 shot on a 550rwhp engine come spring LOL

LIL SS

iTrader: (9)

I have thought about and discussed N20's effect on peak RPM many times with some smart friends. In my testing with no combo changes, peak power RPM on dyno's has normally reverted to a lower rpm, not higher. But I believe this is due to the type of N20 kit I have run.

Another buddy’s BBC with plate has also shown this on an engine dyno.

I have run:
Standard LS style intake with a single nozzle (200 hit)
Single Plain with a plate (400 hit)

My belief is the N20 expands when going from a liquid form to a gas and that added volume of fuel/n20 in the intake and head port decreases available volume in the intake/head port. I believe is this changes the flow characteristics and causes the peak RPM to be sooner even though you are shoving air/fuel in to the intake. The motor still needs to pull it in via vacuum or atmospheric pressure. Seemingly the more I put to it, the lower peak HP rpm is. Now I am not talking 1,000rpm, but NA on my current set up makes peak power at 6,950rpm and on the 300 hit it peaks at 6,700ish. This is a 13-1cr 418: with ported SuperVictor, NX 2 stage 4150 plate with PRC237 heads. I have not dynoed the 400 hit to see what that does to peak power RPM.

Now, could this reduction in peak power RPM be altered with a cam that has different timing or even by going direct port? I think so but don't have the data to back it up. I also think if I went to a bigger head port, it might also move the peak power RPM up, but the larger port would likely kill velocity making it a bit more soggy on motor.

I believe a direct port would aid in keeping the peak power RPM similar to NA because the nozzles are so close to the intake valve not allowing the N20 to expand near as much in its transition to a gas state. But again, I have no testing to prove/disprove that theory.

It is a very interesting topic none the less.

speedtigger

iTrader: (16)

That is an interesting idea lil SS. I think the increased pumping losses pushing out all the extra spent gasses might factors in as well.