im sure everyone in the world knows this but me, but how much horsepower difference is the measurement of horsepower to the wheels and horsepower in the engine....Because I know my 01 L comes with 380 stock, but whats that at the rear wheels? and is there a formula for swapping the info back and forth from regular horsepower to rear wheel hp? thanks......

 

The answer to your question is there is a lot of depends, however, the following link may help:
http://www.geocities.com/realstreetpower/

 

The conventionla wisdom is that the drivetrain losses 20% in an automatic, but that's a very outdated figure, it's gotten much better in the last ten years. As a reference the drivetrain loss on a Lightning is 11.2% @ max Torque.

G

 

What in the hell? Did I just read that right?

I was told by very reputable Mustang builders that my 5 speed coupe had anywhere from 15-17% drivetrain loss. How in the hell is it possible for an automatic to have less of a loss than a manual? Not saying it isn't possible or that I mind but I find 11% very hard to believe.

 

380hp - (380hp * .112) = 337.44 hp which is in the ballpark from what I have seen of the dyno numbers on the '01's.

 

Hey Ivanhoe,

According to there calculator, I have 375 HP at the wheels and 488 HP at the crank (yeah right). Not bad huh? Check Sig. for mods.

 

Stupid asses MM&FF would make you believe that it has over 20% loss in their latest mag. Their also the idiots (Evan Smith included) who believes that shifting your Cobra at 6200 is the optimal shifting point...NOT! Try approx. 6800 or 6600 depending on the gear you're in. Hey MM&FF...DO THE MATH YOU IDIOTS! Quite screwing w/ people's heads who still believe your the only source for truth. You're FAR from it!

BfB

 

LOL That made me feel better and I wasn't the one getting it out of my system. Preach on Bubba

 

The 11.2% is right. And until someone cnvnces me that htey have a better way of checking it than me (a $7Mill drivetrain test stand), I'm sticking to it.

G

 

Well.... here's more input.

Losses occur at each point from the engine back to the wheels.

Manual transmissions are more efficient than automatic transmissions. A rough estimate would be about 7 -12%. Automatic transmissions can really vary.. and 20% or more is not unheard of. The converter also has a loss. The last loss in the system is the axle which falls in at about 2-4%.

What's the total? It really depends on the components used. 11% for a Lightning??? With a heavy truck transmission? Not really. I'd look at an underestimated engine power number before I believed that.

Want another error factor? Temperature plays a huge roll.... maybe 5% Try running your Lightning at the dyno after letting it sit for a few hours.... no warm up.

In general, today's manual vehicles most likely fall in around 8-15% total losses. Automatic vehicles are more likely in the 15-30% range.

Just my comments....

 

One can get an idea of what the loss is by doing a coast down on Dynojet. I'll check more into this but my local guy here can do it I believe. It's pretty accurate too.

BfB

 

MM&FF likes the 20% #, that way they can show 11% gain from Bassani Junk
or whatever else they are trying to push to sell ads.

 

I might be wrong; but, I lean toward under reported flywheel hp. Come on guys, a pick-up weighing in at half a ton more than an SS Camaro running dead even stock times with only about 40 extra horses. (LS1 f-bodies turn about 345 hp stock according to most tuners, no matter what GM reports.)

 

$7 mil test stand? So if this is true, what would be the loss of a manual transmission? You do agree that a manual is less of a loss than an auto yes?

 

Read my rant way up above (my first post on this thread). Hehe

BfB