30-07-2013, 01:57 PM
(30-07-2013, 01:51 PM)jammapic Wrote: Why is the torque wrong? Clutch slip? That's the only real thing the dyno can measure....
If that torque was right we could easily excel up a correct one to work out the values...........
Torque is wrong because they weren't applying enough dyno load. IIRC its something to do with "ramp angles" which is the rate at which the dyno increases the resistance on the rollers and thus the load on the car. Because there isn't enough load the car cant spool the turbo properly, the LDA dosen't drop as quickly and so there's less fuel to spin the turbo and we go round in one big circle.
The dyno operator said it wasn't slipping the clutch and you can see that from the power curve.
(30-07-2013, 01:57 PM)cwspellowe Wrote: Just wondering where this 280lbft figure comes from? Bum dynos can be deceiving.It slips a standard DT valeo, they slip at about 280lb/ft thus the car because it slips the clutch on the road can be assumed to be making 280lb/ft.