Dyno #

[aircop]

Well finally got the truck on the dyno, Dynojet 248. Optical pick up was broke, and they didn't know how to pick up a tach signal without it. So no torque #'s, 448hp. Smarty set on SW5, TST #9.http://www.competitiondiesel.com/forums/attachment.php?attachmentid=9720&stc=1&d=1215106839

 

[JasonCzerak]

Well finally got the truck on the dyno, Dynojet 248. Optical pick up was broke, and they didn't know how to pick up a tach signal without it. So no torque #'s, 448hp.http://www.competitiondiesel.com/forums/attachment.php?attachmentid=9720&stc=1&d=1215106839

you can calc torque. what is your tire size? gearing? you can figure out what RPM your were turning at 70mph and do the math from there.

 

[aircop]

Tires are 265/75 16's, gears are 3.54. Help me out. I don't have a clue on the math.

 

[aircop]

Found formula for torque,
T=(5250)X(HP)/ RPM. 5250 x 448=2352000/ 2750rpm=855fttq.

I think that sounds about right.

 

[haloman]

Good numbers

 

[aircop]

You know that peak TQ is not right, after I thought about it, I used the HP peak rpm to figure TQ. Don't think thats right.

 

[White Knight]

What I did when I had this problem was set up an excel graph with the equations and input your torque at an mph then use the calculations, or input numbers to find rpm (http://www.florida4x4.com/tech/gearcalc.php is helpful), and calculate the torque depending on that rpm and horsepower. Make sense?

 

[White Knight]

By modifying mine, here's what I got

I used 31" tires for the calculation or rpm, yours might be a little different