Dyno results..

[patrickt]

Originally Posted by 767Jockey

Hmmmmmm.......what did the folks at SA have to say about that?

"Should of bought a Roush."

[Power Surge]

Originally Posted by patrickt

"Should of bought a Roush."

Trust me, Roush isn't much better. I've dynoed plenty of Roush motored Cobras that were WAY down on power from what they were "advertised" at.

[patrickt]

Originally Posted by Power Surge

Trust me, Roush isn't much better. I've dynoed plenty of Roush motored Cobras that were WAY down on power from what they were "advertised" at.

All of the advertised HP numbers on engines are fake -- it's just like advertised prices on cars. Most of the better known engine builders will tell you the truth though if you ask them "With everything hooked up on the engine, and with the mufflers attached, what will it make at the crank?" and then follow it up with "... and what does that usually translate to in HP at the rear wheels with my trans. and the POS rear I'm using?" You know they know the answers.

[Power Surge]

Originally Posted by patrickt

All of the advertised HP numbers on engines are fake -- it's just like advertised prices on cars. Most of the better known engine builders will tell you the truth though if you ask them "With everything hooked up on the engine, and with the mufflers attached, what will it make at the crank?" and then follow it up with "... and what does that usually translate to in HP at the rear wheels with my trans. and the POS rear I'm using?" You know they know the answers.

I think the problem is companies like Roush build one motor, setup perfect on their dyno, with proper exhaust, etc, etc and then use those dyno numbers to advertise the motors. In theory, they SHOULD all make the same power, but of course they don't. And then we put them into Cobras with their horrible power robbing side pipes and hp eating IRS setups and wonder why the car makes 200 hp less, LOL.

[Got the Bug]

Originally Posted by patrickt

All of the advertised HP numbers on engines are fake -- it's just like advertised prices on cars. Most of the better known engine builders will tell you the truth though if you ask them "With everything hooked up on the engine, and with the mufflers attached, what will it make at the crank?" and then follow it up with "... and what does that usually translate to in HP at the rear wheels with my trans. and the POS rear I'm using?" You know they know the answers.

So the Dyno results that Roush provided me with my engine are not actual results at the crank? Same thing with a KC engine or a Ford Crate Motor?

Never been on a Dyno to see what the readings are at the rear wheels. Don't really care.

[patrickt]

Originally Posted by Got the Bug

So the Dyno results that Roush provided me with my engine are not actual results? Same thing with a KC engine or a Ford Crate Motor?

Never been on a Dyno to see what the readings are at the rear wheels. Don't really care.

To a certain extent, yes. Especially if they dyno'd you with open pipes, even more so if the water pump was not running, extra even more so if they dialed in a "compensation factor," etc. The only true numbers that you can believe are the ones you see with your own eyes on a chassis dyno.

[Got the Bug]

Originally Posted by patrickt

To a certain extent, yes. Especially if they dyno'd you with open pipes, even more so if the water pump was not running, extra even more so if they dialed in a "compensation factor," etc. The only true numbers that you can believe are the ones you see with your own eyes on a chassis dyno.

Makes sense. Thanks for the clarification.

[patrickt]

Originally Posted by Got the Bug

Makes sense. Thanks for the clarification.

... and that's "industry-acceptable" fudging. For some of the other stuff, check this out: http://www.turbomagazine.com/tech/04...ems/index.html