darrenjlobb's Rolling Road Chassis Dyno Project

[silverzx]

Well done chap! Is that one of the 2 now built up? So does the read out currently work by somehow measuring the rate of water flow? Struggling to get my head around it!!

The way any "braked" dyno works (so water brake, eddy current brake, disk brake) is basically there is a brake / brakes on the shaft on the drive rollers which "hold back" the engine, so if you imagine your steady state tuning, you WOT the car, and keep loading whatever brake you have until the car stops accelerating / sits at steady rpm, you are then "braking" the full force of the engine, so if you imagine, the full torque of the car is then acting against the brake / brakes. You then have a load cell / strain gauge mounted between the brake and the chassis to measure your "torque"...this is how torque figure is generated, obviously this is torque at the wheels once you have calculated wheel to roller ratios and then torque at the flywheel via gear / FD ratios and trans losses...

The adding / dropping of water just effects how full the stator housing is off water, therefore effecting how much load you have...

Inertia dynos just use the "speed of acceleration" to calculate hp based on the mass of the flywheel etc...but these imo arnt the best for tuning, where you want to spend time at certain rpms working on the tune etc..

Looking great. Amazing the size of that heat exchanger!!!

Heh, well if you think about it, if your steady state tuning say 200hp, thats 149kw of energy going somwhere, 95% of it is going into the water in the stator housing as heat, so it needs to get rid of it!

You could of just said that in the first place!