converting rear wheel numbers to fly wheel numbers

[stevesoasis]

What would be the most accurate way to convert the rear wheel hp and tq numbers to the numbers at the flywheel??

[DWSTANG67]

Run it on a dyno,

the old rule of thumb used to be around 20% but some cars will be higher and some lower depending on the setup and mods the more efficient a transmission and rear the less power it will waste.

for an example Take the old rear wheel drive luxury cars to get a smooth shift the transmission builds lots of heat and waste horsepower going from gear to gear smoothly Now a worked transmission where the car snaps the next gear is wasting less.

[stevesoasis]

I have the dyno numbers already, i was just wondering what is an accurate way to get the numbers at the motor. I have heard the 20 percent rule but some people say that is not the way to do it. Just wanted some opinions for my own curiosity, thx for the response :beer:

[RacerX]

Add 60hp to the rwhp number for crank. Loss is static through the driveline and isn't a percentage that goes up with hp.

[sailsmen]

Add 60hp to the rwhp number for crank. Loss is static through the driveline and isn't a percentage that goes up with hp.

What he said!;)

[Marauderjack]

And soft shifts have nothing to do with it!!:rolleyes:

[RacerX]

And soft shifts have nothing to do with it!!:rolleyes:
:dunno: What soft shifts??? http://www.svtperformance.com/forums/images/smilies/dancenana.gif

[Marauderjack]

Take the old rear wheel drive luxury cars to get a smooth shift the transmission builds lots of heat and waste horsepower going from gear to gear smoothly Now a worked transmission where the car snaps the next gear is wasting less.

These "smooth shifts" is what I'm referring to.....

[RacerX]

http://www.svtperformance.com/forums/images/smilies/dancenana.gifNo soft shifts here. Wife won't even drive it!http://www.svtperformance.com/forums/images/smilies/dancenana.gif

[Marauderjack]

http://www.svtperformance.com/forums/images/smilies/dancenana.gifNo soft shifts here. Wife won't even drive it!http://www.svtperformance.com/forums/images/smilies/dancenana.gif

Ha Ha!!

When I first did the J-Mod my 1-2 shift was RIDICULOUS so I know what you are speakin' of!!:eek: