darrenjlobb's Rolling Road Chassis Dyno Project

[toseland]

Not updated this in a while,

We are largely up and running now, all computer controlled, able to run in both intertia, and fully brake modes, or a combination (for faster power runs), and can do steady state tuning / data logging. We are seeing very repeatable results which is a good sign, however having problems with calibration at the moment of torque, so under reading torque by about 1/3, obviously therefor effecting the hp considerably. Below was a photo after doing 3 power runs on a stock hdi, so can see how repeatable it is, just on the low side, but am sitting here doing some maths at the moment trying to figure out where ive gone wrong / what ive added up the wrong way around!

Note - The pulls were obviously just "testing" so didnt rev them out / load down low for a "full" graph, just the area where it makes power to see where we were at!



Either way its already up and running as a tuning tool with good repeat ability, just need to iron out the calibration and should be good for accurate power runs then as well!

Also took the time today (Finally!!) to plate in around the rest of the dyno, and re fit most of the covers, so cut up some plate I had kicking about:



And painted it up to match:







Really pleased with what I've ended up with, already prooving itself as a very useful tool! Cant wait to get my car project back underway now! Should be able to do a tonne of initial setup / tuning without even MOT/Insure/Tax'ing it / hitting the public roads this time, which should save me a penny and be very useful development tool!

If we have any budding mathematicians on here who know about torque / effects when applied at an angle etc let me know as trying to figure something out at the moment and could use someone who knows these complicated matters!

Thanks for reading

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Whats the maths problems you need sorting mate, i could take a look at it.
if you are concerned about the dyno running at an angle it shouldnt make any difference though as you are not moving the car and therefor are not having to worry about gravity as a force.