So how much more hp would you have to make NA to equal a NOS engine?

I would guess what ever the NOS engine is making ?

Very interesting subject I have often thought about. I figure it would simply come down to how much nitrous was intended but when I see strong running n/a combos spray 150 and drop et like a 12sec car it makes me think, sorry for the lack of experience/input but this could get good

You talking just the HP number here Brad or ET also? I think it would be hard to match the ET due to the torque gained with a kit.

It depends of course on how much your making with the NOS set up I ran a bunch of different size and HP pump gas motors in my old Duster, 500 HP 440 would run low 12s,a 550 HP 464 C.I. 440 would run low 11s and high tens, the 518 C.I. 400 block stroker motor made 727 HP and ran 9.993 ET at 134.7 MPH through the full exhaust sytem and air cleaner on weighing 3450 lbs with me in it Real world numbers on the weight and HP

I don't remotely understand your question, or what you are trying to ask. But our motor makes 1400 on nuts and over 2200 on the hose........so related to OUR combo, the answer is, you CAN'T

Monte

Yes...that's an odd question.

As already pointed out by Monte, a N/A motor will be limited on the power it can make, a power adder, NOS, supercharged or turboa charged, will make more power per C.I. with the same parts do to the power adder. Todays Pro Stock N/A motors are making north of 1300 HP, Pro Mod motors of similar C.I. are making north of 3500 HP with thier power adders

People always look at hp numbers but tend to forget, especially with nitrous motors, is they make gobs and gobs or torque, and that is what accelerates the car.

It takes HP to achieve a certain ET period. A diesel with 300 hp 850 TQ will not ET much different than a 300 HP 300 TQ gas engine if both are geared for maximum ET.

Monte is almost correct about not making 2200 NA, you could always sell your nice comfy house on the lake and give it all to Sonnys and he could build you a 1000+ CID NA motor and do it but it would be VERY expensive.

If you are talking a stock 440 with a 100hp shot, you could do a cam-carb-intake-headers and get 100 HP that will be there whenever you hit the gas instead of whenever the bottle happens to be full.

Very vauge question.

This was wrong decades ago and is still wrong today. That is why Pro Stock went faster with a 5 speed than a 4 speed. And it took a certain Dodge Pro Stock team a while to figure that out. They fought the 5 speed because they thought the TORQUE of the Dodge would make up for the loss of gear.

That didn't end up very well.

If you have a 700 hp nos motor, how much hp NA would you have to make to go the same time in the quarter.

700 is 700. If all else is equal such as gearing weight etc. That's why the math does not take into account power adders and such.

But we know the nos motor will make more torque.

HP is a measure of how fast the work gets done.

TQ is NOTHING without RPM. You can have 1000lbs TQ and zero work gets done, if you have 1000 HP work is being done.

HP can come from 1000 ft lbs at 1000 RPM (about 190 HP) or you can have 100 ft lbs at 10000 RPM and you still get 190 HP. You can get the TQ the same by gear ratios to arive at the same TQ at the wheels, you can not multiply HP to get more HP.

Dayum HRD, that is a good post. every one forgets about TIME and work done over time.

They also forget with out gears they have nothing, unless of course you can burn Nitro...wait...they still have a rear gear......but you can use less gear with Nitro.

Good post.

Using the 700hp nitrous motor, I'll guess 900NA so it'll maybe make the same pass.


Who cares, the boosted car in the staging lanes behind them will rape both of them

A 700 hp NA motor will go the same exact time as a 700 hp NOS motor if the power curve is equal.

If the power curve is different between the motors then you have a more difficult question to answer. In that case it will depend on gearing, aero, traction, chassis setup, etc.

Never having run nitrous, I don't know the true facts, but this is what would make sense to me. If you throw a 200 hp shot at a motor, and it was stalling at 5250, where torque and hp are equal, then the extra torque would be 200 ft lb? or roughly that. Cut the rpm by 25 percent, and each cylinder now has to eat a lot more nitrous, because the 200 shot is a constant flow rate, not changed by rpm. and if it doesn't go boom, the torque would go up by what ever it takes to make 200 hp at that rpm. If this is wrong Monte, please chime in.

The nos motor will make more torque below the peak HP then the na motor. But they will both make the Same exact torque at their peak HP if both are say 700HP at the same RPM

So if the NA motor doesn't have the proper converter, the same HP nos motor would have a advantage in that case.

I can also see the same HP nos motor having a advantage over the same HP na motor by lowering the stall to take both advantage of the extra torque down lower and still using the hp up higher as it revs through a wider power band.

Hence your question, How much hp NA would one need to make up for that.

Answer is, Exactly .675 x Pie divided by RPM x stall mixed with the gear ratio formula.








Or, it just Depends.