Curious about HP loss through the drivetrain.

[Jake Raby]

I have two engine dynes and a chassis dyno all within 50' of each other. We can pull an developmental engine off the engine dyno and install it into the car the someday, then test it on the chassis dyno. I see 18-22% losses generally from a manual car.

Pay zero attention to the factory power rating, often times they are posted in DIN and not SAE anyway.

[KRAM36]

Originally Posted by Jake Raby

I have two engine dynes and a chassis dyno all within 50' of each other. We can pull an developmental engine off the engine dyno and install it into the car the someday, then test it on the chassis dyno. I see 18-22% losses generally from a manual car.

Pay zero attention to the factory power rating, often times they are posted in DIN and not SAE anyway.

Never expected that much of a loss with the trans axle mated directly to the transmission. Unlike a Camaro or Mustang having a drive shaft between the trans and trans axle.

Do you have any numbers to share on the loss with a Tip trans?

[Topless]

Originally Posted by Jake Raby

Pay zero attention to the factory power rating, often times they are posted in DIN and not SAE anyway.

Yep, HP numbers on shiny brochures from Porsche should be read as "at least xxx HP".
HP varies quite a bit depending on elevation, air temp and atmospherics. Also ignore all the dyno numbers from aftermarket parts mfg companies who freely rig the results because they are also quite variable.

Chasing dyno numbers from others is like herding cats. An exercise in futility. The only ones that really count are on your car.

[KRAM36]

Originally Posted by Topless

Yep, HP numbers on shiny brochures from Porsche should be read as "at least xxx HP".
HP varies quite a bit depending on elevation, air temp and atmospherics. Also ignore all the dyno numbers from aftermarket parts mfg companies who freely rig the results because they are also quite variable.

Chasing dyno numbers from others is like herding cats. An exercise in futility. The only ones that really count are on your car.

Exactly why I picked that Fabspeed video. Figured they would post as low as possible on the stock HP number, which they showed 229 whp. That's about a 11% loss from Porsche's 258 bhp number.

I thought that was actually pretty good, then Jake rained on my parade lol. Maybe that's what j.fro was referring to as I'm sure Jake's engines were producing more then 258 bhp.

[Topless]

Originally Posted by KRAM36

Exactly why I picked that Fabspeed video. Figured they would post as low as possible on the stock HP number, which they showed 229 whp. That's about a 11% loss from Porsche's 258 bhp number. Because that motor is probably producing 280 at the crank bone stock.

I thought that was actually pretty good, then Jake rained on my parade lol. Maybe that's what j.fro was referring to as I'm sure Jake's engines were producing more then 258 bhp.

Chasing others dyno numbers is a fools errand.

[KRAM36]

Originally Posted by Topless

Chasing others dyno numbers is a fools errand.

I'm not chasing anyone's dyno numbers. I'm trying to find out the percent of HP lost in the drivetrain.

So a 2003 Boxster S has 280 bhp?

[BYprodriver]

Originally Posted by Topless

Yep, HP numbers on shiny brochures from Porsche should be read as "at least xxx HP".
HP varies quite a bit depending on elevation, air temp and atmospherics. Also ignore all the dyno numbers from aftermarket parts mfg companies who freely rig the results because they are also quite variable.

Chasing dyno numbers from others is like herding cats. An exercise in futility. The only ones that really count are on your car.

Don't forget the fuel used too.