Slide86, I have done a jzx100 manual and from memory didn't have any problems with wheel spin, I will adjust the ramp rate to suit the power level tho.

If a vehicle has a very powerful engine or an engine which accelerates very fast, you should adjust the ramp rate to suit, for example,

What is ramp rate, this is how fast the dyno allows the car to accelerate on the rollers, a slow ramp rate would be 5km/h/sec, which means that every second the vehicle would increase it's speed by 5km/h, a fast ramp rate is say 18km/h/sec. Get a picture of the difference.

Lets just say we have a powerful engine that comes on boost very quickly making lots of power/torque, we would need a faster ramp rate, if I tried to use a slow ramp rate with a fast accelerating engine, the wheels would out run the speed at which the dyno is unloading the rollers and we would end up with wheel spin and end up with a lower reading.

At the other end of the spectrum, imagine an engine with very little power/torque, if I had a very fast ramp rate, the wheels would never load the rollers until maybe near the end of the run, so we would end up with a power/torque curve less than it actually had.

Sometimes tho it is necessary to change the ramp rate to one which maybe slower, if we were to really load the engine and test if ignition timing etc was correct, a slow ramp rate would replicate going up a long steep hill, of course longer ramp rates mean the run takes longer, which may put extra stresses on gearboxes/diffs/cooling systems.

Our Dyno(Mainline) also has an inbuilt weather station which is constantly updating baro pressure/temp/humidity, this automatic/constant updating also removes an area to be able to 'cheat'.

When dynoing a sportsbike, say a GSXR1000, a fast ramp rate is necessary due to how hard the engines come on power, if the ramp rate is too slow, the reading will be down and usually you end up with one shredded tyre aswell.

With regards to the 4age power/torque curves, it wasn't until I was driving home that I thought I should of printed out a GZE one so the comparison of torque could be made.

Sam, I will try and put as much info as I possibly can with regards to engine specs.