just looking over my old dyno's

on one Y-axis is the HP rating, and the X-axis the KM/Hr but on the other Y-axis is a Lb reading ??

is this the reading to find out yur torque or wats goin on there ?

just looking over my old dyno's

on one Y-axis is the HP rating, and the X-axis the KM/Hr but on the other Y-axis is a Lb reading ??

is this the reading to find out yur torque or wats goin on there ?
Yeah. Foot-Pound is the imperial torque unit.

edit: 1 (ft lb) = 1.35581795 newton meter

ok say i have around 600 how do i work it out ?

Oh.. the number may just be tractive effort (if it's just lb and not ft-lb).. in which case it's more likely..

1 pound force = 4.44822462 newton

so 600 would only be bout 134 NM or torque ?

so 600 would only be bout 134 NM or torque ?
Yeah, gutless :bowrofl:

Nah, 600 lb force gives you 2668 Newton.. meaning your tyres were exerting that much force against the rollers. I don't know how you'd convert that into measure of torque.

hmm well if its 1=1.3558
then 600 = 442 Nm

does that sound about right ?

only if the units on the left hand Y-axis are ft lb (foot pound).. if it's just lb (pound) then they only gave you tractive effort, not torque.

hmmm
so wat do magnas normally come out with ??

If you reeeeally want to know about torque, estimate your power figures at the flywheel.. so 160hp ATW should give you around 160kW at the fly. Work out at what RPM that happened.. say 5200rpm..

then: T = P * 9550 / R

so at 5200rpm with 160kW..

T = 160 * 9550 / 5200 = 293Nm

of course peak torque occurs at a lower RPM than peak power.. and should coincide with the peak in your tractive effort curve..

read off the power at the peak of your tractive effort curve, work out the RPM from the engine speed, convert power to approx flywheel power, then plug into the formula. Easy! lol

geez yur asking alot there, i aint got no tacho to find out the rpm

If you know what gear it was, and what speed you were travelling, it shouldn't be too hard to work out :P

4th gear 140km/hr

If it was a dyno dynamics dyno then it will be in Pounds or newtons of tractive effort, which unless you know the length of the lever in the dyno(roller diameter) then it can't be converted to torque. The 3.0l were rated at 255nm of torque, when mine was dynoed stock it got 244 and after a couple of mods it got 271 about 400rpm later from memory. If you want to get an idea of how your car is doing tractive effort wise, compare your LB reading to someone else with a magna who got a DD graph, then you wont know actual torque but comparitive differences :P

That calculation that Cthulu gave you is bang on and if you take a look very simple, all you need to know is 2 of the 3 figures, torque,power,rpm. So you having a dyno graph should have RPM and Power and if you don't have an rpm reading slap your dyno guys. Basically look where your peak tractive effort is, then get your rpm and power at that point and whack them into the calculation and whalla, Torque.

Matthius