HP in Dyno Tests vs. HP marketed
06-21-2004, 05:48 PM
#1
Happy with my STi!
Thread Starter
Join Date: Jan 2003
Location: Los Angeles, California
Age: 40
Posts: 1,347
Likes: 0
Received 0 Likes
on
0 Posts
HP in Dyno Tests vs. HP marketed
This might be a stupid question but I never understood why HP in Dyno tests are always significantly lower than the HP claimed by manufacturers? I assume that the HP in Dyno tests are more accurate, then why do manufacturers claim such high but unrealistic HP figures?
06-21-2004, 06:38 PM
#2
Senior Moderator
they are 2 different dynos. one is a engine dyno, its dynoed at the engine and not the wheels.
which would you rather claim. 225 hp or 190?
which would you rather claim. 225 hp or 190?
06-21-2004, 06:53 PM
#3
Happy with my STi!
Thread Starter
Join Date: Jan 2003
Location: Los Angeles, California
Age: 40
Posts: 1,347
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by fsttyms1
they are 2 different dynos. one is a engine dyno, its dynoed at the engine and not the wheels.
which would you rather claim. 225 hp or 190?
which would you rather claim. 225 hp or 190?
06-21-2004, 10:13 PM
#4
Liquid Ice
Yeah, like fsttyms1 said, manufacturers measure crank horsepower not wheel horsepower. Thats why many people will say their car dyno'ed at 230whp, meaning wheel horsepower, the actual power being put down to the wheels ...
This is the main reason why a manual transmission is better than an automatic transmission ... A manual transmission is more efficient than an automatic transmission which uses a torque converter. The torque converter uses some power on its own and steals some of your crank horsepower. The TL-S 5AT has a huge loss from the powertrain to the wheels, somewhere around 20-25%! That means even though you're putting out 260hp at the crank, you're only putting down about 190-200hp to the wheels. Compare that with the CL-S 6MT, which puts down about 220-230hp to the wheels from the same exact 260hp. Which is only about a 15% loss of power to the wheels and you can see why a manual transmission is preferred.
This is the main reason why a manual transmission is better than an automatic transmission ... A manual transmission is more efficient than an automatic transmission which uses a torque converter. The torque converter uses some power on its own and steals some of your crank horsepower. The TL-S 5AT has a huge loss from the powertrain to the wheels, somewhere around 20-25%! That means even though you're putting out 260hp at the crank, you're only putting down about 190-200hp to the wheels. Compare that with the CL-S 6MT, which puts down about 220-230hp to the wheels from the same exact 260hp. Which is only about a 15% loss of power to the wheels and you can see why a manual transmission is preferred.
06-21-2004, 10:24 PM
#5
Happy with my STi!
Thread Starter
Join Date: Jan 2003
Location: Los Angeles, California
Age: 40
Posts: 1,347
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by LiQiCE
Yeah, like fsttyms1 said, manufacturers measure crank horsepower not wheel horsepower. Thats why many people will say their car dyno'ed at 230whp, meaning wheel horsepower, the actual power being put down to the wheels ...
This is the main reason why a manual transmission is better than an automatic transmission ... A manual transmission is more efficient than an automatic transmission which uses a torque converter. The torque converter uses some power on its own and steals some of your crank horsepower. The TL-S 5AT has a huge loss from the powertrain to the wheels, somewhere around 20-25%! That means even though you're putting out 260hp at the crank, you're only putting down about 190-200hp to the wheels. Compare that with the CL-S 6MT, which puts down about 220-230hp to the wheels from the same exact 260hp. Which is only about a 15% loss of power to the wheels and you can see why a manual transmission is preferred.
This is the main reason why a manual transmission is better than an automatic transmission ... A manual transmission is more efficient than an automatic transmission which uses a torque converter. The torque converter uses some power on its own and steals some of your crank horsepower. The TL-S 5AT has a huge loss from the powertrain to the wheels, somewhere around 20-25%! That means even though you're putting out 260hp at the crank, you're only putting down about 190-200hp to the wheels. Compare that with the CL-S 6MT, which puts down about 220-230hp to the wheels from the same exact 260hp. Which is only about a 15% loss of power to the wheels and you can see why a manual transmission is preferred.
Thread
Thread Starter
Forum
Replies
Last Post
MrHeeltoe
1G TSX Tires, Wheels, & Suspension
20
02-23-2023 01:54 PM
emailnatec
5G TLX Tires, Wheels & Suspension
29
09-28-2018 04:27 PM
MrHeeltoe
2G TSX Tires, Wheels & Suspension
3
09-29-2015 10:43 PM
MrHeeltoe
3G TL Tires, Wheels & Suspension
0
09-28-2015 05:43 PM
