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Originally Posted by bobcat
Hi Ren,
with the 202whp you got on the swautos maha lps 3000 (same as the powerstation one), you cannot correct for the transmission loss alone as this does not take into account the drag from the rollers and loading. The dyno will workout the drag and calculate crank figures from it.
you made more whp on the swautos maha than the powerstation one but they may have been loading the dyno or you had more drag in the rollers.
however if you look at your graph, the whp plotted is pretty much spot on with what you got on the sw's ones analog dials.
yesterday figures were given as whp with no loading and all that was controlled was the lowering and raising of cars which was visible to all. However the figures should be used as a comparison only, becuase as mentioned they do not take into account drag which will vary between cars and thus why for 100% accurate figures from dyno you need to measure drag.
Yesterday was setup as an opportunity to allow us to run as many cars in the few hours we had, thus why the dials where left on whp and the cars where dropped on and ran.
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Bobcat,
From the pictures, this dyno appears not to the same as RICA's or Powerstation' s MAHA LPS 3000 and looks to me to be the much older SUN Road-a-Matic 12 model that is based on a Maha dyno which is now obsolete.
The Maha LPS 3000 CAN calculate engine power from measured (not calculated) transmission losses, and can account for the rollers and the loading.
The MAHA LPS 3000 does not use analogue dials. It uses a fully digital electronic control system, matched to a MAHA supplied data aquisition system, which is all controlled by PC.
The dials on a RAM 12 dyno can ONLY display wheel power and will automatically display negative power during coast down. It is not possible to switch the dials on a RAM 12 dyno to give engine power. It's also physically impossible to measure transmission loss in real time during the full throttle dyno run itself because this can only be done during the coast down phase.
Having owned and operated several SUN/MAHA/Dynojet dynos over the last 20 years, I can use my vast experience to dispel any inaccuracies in this field.
Regards,
Hamish.