View Full Version : How accurate are horsepower calculators ?

08-24-2002, 02:35 PM
So here is the deal.
I took the performance numbers from my latest issue of M&FF for the Marauder and plugged them into an ET based HP calculator with an estimated car weight of 4350 pounds and 20% loss through the drivetrain. What I came up with are 279.3 rear wheel horespower and 335.2 flywheel horespower.
This from an engine rated at 302 HP and 318 FTLBS of torque.

What do you all think about this? Are the engines under rated or are the HP calculators wrong.

08-24-2002, 02:39 PM
Check my post on Marauders on the old forums, or do a google search for maurader. Someone posted dyno numbers already. I thing flywheel hp was 239.

08-24-2002, 03:01 PM
If flywheel horsepower was 239 the engine is under rated. Are you sure that isn't rear wheel horepower?

08-24-2002, 11:20 PM
I believe that's what he meant to say. :LAUGH:

08-25-2002, 07:53 AM
oops, typing too fast.

08-25-2002, 09:11 AM
I used a couple of those calculators for the Mach based on the Atlanta runs. I used a weight of 3685 lbs. with 1/4 times of 13.41 @104. Avg. results from the calculators are from 300-310 rwhp.

Obviously this doesn't jive with the 305 hp Ford has officially stated. Is this underrated? Is Ford perhaps using the rwhp as the official hp?

I did notice that there wasn't any discussion on these calculators of torque specifications. You'd think if they ask 1/4 mile times or speed trap mph, they'd would also want to know the torque ratings.

It will be interesting to get the first dyno results from the production cars.

08-25-2002, 11:05 AM
we see what happens this weekend at speedway.;)

08-25-2002, 11:33 AM
02: Give us the details about what you're talking about.

What is the event at what speedway?