Graphing HP/TQ

cad614 · 10-23-2002, 08:02 PM

I have some data that I was able to pull from a Audi S4 and I am looking to incorporate it into the traditional hp vs rpm graph we are used to seeing. Currently the only equation I have been able to find is how to calculate horsepower. The actual data recorded was the engine RPM and torque, max 424@5240, which gave me a horsepower figure of 422 at the flywheel.

Can anyone tell me how to graph this, or do I need more information?

302 LX Eric · 10-24-2002, 12:28 PM

I'm a little confused by the details in your post.

First, do you have a set of data points? If so, then drop them into Excel and then use the graphing function to create a nice graph. Easy to do, should take like 5 mins.

If you only have max HP and RPM numbers, then you are not going to be able to graph anything other than one point. You need more data points as each car will create different HP and TQ numbers at different RPMs. The points will not be linear, but somewhat parabolic in shape. There is no formula for determining HP/RPM points down the range from peak - the possibilities are inifinite.

E

10-23-2002, 08:02 PM	#1
cad614 Senior Member Join Date: Apr 1999 Location: San Angelo, TX Posts: 377	Graphing HP/TQ I have some data that I was able to pull from a Audi S4 and I am looking to incorporate it into the traditional hp vs rpm graph we are used to seeing. Currently the only equation I have been able to find is how to calculate horsepower. The actual data recorded was the engine RPM and torque, max 424@5240, which gave me a horsepower figure of 422 at the flywheel. Can anyone tell me how to graph this, or do I need more information? __________________ Mike '95 GT Convertible

10-24-2002, 12:28 PM	#2
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	I'm a little confused by the details in your post. First, do you have a set of data points? If so, then drop them into Excel and then use the graphing function to create a nice graph. Easy to do, should take like 5 mins. If you only have max HP and RPM numbers, then you are not going to be able to graph anything other than one point. You need more data points as each car will create different HP and TQ numbers at different RPMs. The points will not be linear, but somewhat parabolic in shape. There is no formula for determining HP/RPM points down the range from peak - the possibilities are inifinite. E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'