hp calculator ?
03-20-2007, 02:58 AM
#1
Banned
Thread Starter
Join Date: Aug 2004
Location: seattle, washington - usa
Posts: 1,822
Likes: 0
Received 0 Likes
on
0 Posts
hp calculator ?
i've found a lot of hp calculators based on quarter mile times, trap speeds, and even a very good one based on known torque values;
http://vlsicad.ucsd.edu/~sharma/Potp...est_intro.html
i'm wondering if there's a way to calculate hp and/or torque based on the following info;
time from 2krpm to 6krpm in fourth gear
anybody know?
http://vlsicad.ucsd.edu/~sharma/Potp...est_intro.html
i'm wondering if there's a way to calculate hp and/or torque based on the following info;
time from 2krpm to 6krpm in fourth gear
anybody know?
03-20-2007, 06:25 PM
#7
Addict
Rennlist Member
Rennlist Member
Join Date: Feb 2002
Posts: 5,384
Likes: 0
Received 0 Likes
on
0 Posts
You need to measure you mass and your acceleration to calculate the Force (HP). Also, drag resistance comes into play at higher speeds. There are indirect ways of obtaining these values, like the RPM vs gearing vs weight, distance vs time vs weight etc. Thinking about it, I should be able to get this from my GPS.
Trending Topics
03-20-2007, 06:32 PM
#9
Addict
Rennlist Member
Rennlist Member
Join Date: Feb 2002
Posts: 5,384
Likes: 0
Received 0 Likes
on
0 Posts
SImple F=MA, its getting proper values to A that is the issue. The mass is just the weight of the car. I am sure I get velocity and acceleration vs time from my GPS.
A=dV/dt or the acceleration = rate of change in Velocity with time.
A=dV/dt or the acceleration = rate of change in Velocity with time.
Last edited by Bri Bro; 03-21-2007 at 10:47 AM.
03-21-2007, 01:51 AM
#10
Race Car
Join Date: Oct 2003
Location: Pueblo,CO
Posts: 3,591
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by nize
got any links ?
http://www.fantasycars.com/derek/quartmile.html
03-21-2007, 04:42 PM
#14
Drive-by provocation guy
Rennlist Member
Rennlist Member
Join Date: Apr 2002
Location: NAS PAX River, by way of Orlando
Posts: 10,439
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by nize
i've found a lot of hp calculators based on quarter mile times, trap speeds, and even a very good one based on known torque values;
http://vlsicad.ucsd.edu/~sharma/Potp...est_intro.html
i'm wondering if there's a way to calculate hp and/or torque based on the following info;
time from 2krpm to 6krpm in fourth gear
anybody know?
http://vlsicad.ucsd.edu/~sharma/Potp...est_intro.html
i'm wondering if there's a way to calculate hp and/or torque based on the following info;
time from 2krpm to 6krpm in fourth gear
anybody know?
I might have 350hp and stock flywheel, thus my time for 2k-6k would be slower than someone with 300hp and lightweight flywheel....no?
03-21-2007, 04:47 PM
#15
Drive-by provocation guy
Rennlist Member
Rennlist Member
Join Date: Apr 2002
Location: NAS PAX River, by way of Orlando
Posts: 10,439
Likes: 0
Received 0 Likes
on
0 Posts
Also makes me think how inaccurate 0-60, 1/4 ET/trap speeds are as well assuming one car is running slicks and another on DOT.
The best approach is the one that eliminates ALL variables, or as many as possible.
I think your line of thinking is there, but maybe change from timed of X rpm to X rpm and use X speed at 2K vs speed at X speed at 6K; then factor in mass/weight and the time it took to get X speed to X speed.
But again, spool up would skew those numbers as well because you are not trying to measure performance but hp/tq.
The best approach is the one that eliminates ALL variables, or as many as possible.
I think your line of thinking is there, but maybe change from timed of X rpm to X rpm and use X speed at 2K vs speed at X speed at 6K; then factor in mass/weight and the time it took to get X speed to X speed.
But again, spool up would skew those numbers as well because you are not trying to measure performance but hp/tq.