if you have 454 hp at the rwhp..what is the cal for flywheel?

[Qualitywires.com]

what is the formula? On Doug Levin's website for online dyno..I have an estimated 454 rwhp.

 

[treynor]

Using the 15% driveline loss correction factor: multiply RWHP by 1/(1-.15), or 1.176. By this calculation, you have 534 BHP

Using the 12% driveline loss correction factor discussed in a different thread: multiply by 1.136. By this calculation, you have 516 BHP.

 

[Qualitywires.com]

cool thanks treynor!

 

[C O D Y]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by treynor:

Using the 12% driveline loss correction factor discussed in a different thread: multiply by 1.136. By this calculation, you have 516 BHP.
<HR></BLOCKQUOTE>

I thought it was 1.115? Anyway I came up with 506.21

 

[Venom Lover]

If you go to the FAQ on this site and go to the section on power, you will see numbers that imply 13%-15% driveline loss. Hence the formulas that treynor posted (though I don't know where he got 12%).

Anyway, all that really matters is how much power you put to the ground. Power at the flywheel is for bragging rights only, and it sounds like you didn't even do a real chassis dyno.... Go do a chassis dyno and find out the real numbers!

 

[VEETENN]

Also 454 divided by .85 (15%) or .88 (12%) works too.


<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by treynor:
Using the 15% driveline loss correction factor: multiply RWHP by 1/(1-.15), or 1.176. By this calculation, you have 534 BHP

Using the 12% driveline loss correction factor discussed in a different thread: multiply by 1.136. By this calculation, you have 516 BHP.

<HR></BLOCKQUOTE>

 

[Chuck 98 RT/10]

This is funny. I was talking to some Fbodys and they were using 18%. Talk about an affordable power adder.

 

[RedGTS]

All the conversion factors mentioned above are frequently used and provide decent rough estimates. However, the truth is driveline loss is closer to a fixed amount than it is to a particular percentage. IOW, if after dynoing an engine at 400 bhp on an engine dyno, you place it in a particular car which then produces 340 rwhp on a chassis dyno, or a driveline loss of 15%, and then up the engine's power to 600 bhp, the driveline loss will be closer to the original 60 hp loss than to 90 hp (15%). So driveline loss for higher hp motors is less, on a percentage basis. At least that's the way a couple of my engineer buddies explained it to me.

Ronnie