Can someone check my math???
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Can someone check my math???
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: Can someone check my math??? (mn_vette)
Jake
Safety Car
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
Re: Can someone check my math??? (mn_vette)
I checked your math and it is fine but I do not believe you added your N2O HP correctly to the engine HP at 3000 RPM. A 250 HP N2O kit is not going to produce 250 extra HP at 3000 RPM, it will produce the 250 HP at the engines N/A HP peak RPM point. If the the N/A hp peak occurs at 6000 RPM the N2O HP peak will also occur around 6000 RPM. The HP addition at 3000 RPM will be approximately 1/2 of the peak HP gain of 250 or approximately 125 HP.
If I use your estimate of 200 HP at 3000 RPM and then add 125 for a total of 325 HP at 3000 RPM I would end up with a torque number or 569 FT/LBS.
If I use your estimate of 200 HP at 3000 RPM and then add 125 for a total of 325 HP at 3000 RPM I would end up with a torque number or 569 FT/LBS.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: Can someone check my math??? (bjankuski)
Correct me if I'm wrong, but the formula is
HP= (TQxRPM)/5252
Remember, HP is a calculated value (not measured) determined by torque and rpm.
Jake
HP= (TQxRPM)/5252
Remember, HP is a calculated value (not measured) determined by torque and rpm.
Jake
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Re: Can someone check my math??? (bjankuski)
If I use your estimate of 200 HP at 3000 RPM and then add 125 for a total of 325 HP at 3000 RPM I would end up with a torque number or 569 FT/LBS.
Correct me if I'm wrong, but the formula is
HP= (TQxRPM)/5252
HP= (TQxRPM)/5252
TQ = (HP * 5252)/RPM
Try out the numbers and you'll see that they work both ways.
http://vettenet.org/torquehp.html
Instructor
Joined: Sep 2002
Posts: 116
Likes: 0
From: Boise ID
Re: Can someone check my math??? (mn_vette)
mn vette:
Your formula looks basically correct but I think you need to double check your unit manipulation. The formula if I can remember correctly, (my engineering reference book is at work); Power(Watts) = Torque(Radius) X [cross] Force (newtons) multiplied by Angular velocity (radians/sec). Again if I can remember correctly this formula is only valid for measurements taken using the metric system, this is where that correction factor of 5252 probably comes from but my only concern is since you don't have a unit label associated with it you don't know if it can be simply divided out as you have done. I will try to do a little more research later tonight and double check your figures.
Ethan
Your formula looks basically correct but I think you need to double check your unit manipulation. The formula if I can remember correctly, (my engineering reference book is at work); Power(Watts) = Torque(Radius) X [cross] Force (newtons) multiplied by Angular velocity (radians/sec). Again if I can remember correctly this formula is only valid for measurements taken using the metric system, this is where that correction factor of 5252 probably comes from but my only concern is since you don't have a unit label associated with it you don't know if it can be simply divided out as you have done. I will try to do a little more research later tonight and double check your figures.
Ethan
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Can someone check my math??? (mn_vette)
Your math looks good to me; I think your estimate may indeed be a little low on HP as my 350 L98 builds 180 CHP at 3,000rpm.
The only issue I see is how that 250-shot varries across the RPM band. We can expect pumping losses to vary with RPM due to exhaust restriction, among other factors (is a 250-shot constant across the RPM band...then torque must fall off...).
[Modified by 65Z01, 1:14 PM 12/7/2003]
The only issue I see is how that 250-shot varries across the RPM band. We can expect pumping losses to vary with RPM due to exhaust restriction, among other factors (is a 250-shot constant across the RPM band...then torque must fall off...).
[Modified by 65Z01, 1:14 PM 12/7/2003]
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote