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D DEV
Joined: 20 Feb 2012
Posts: 25
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 Posted: Sun Apr 29, 2012 1:50 pm Post subject: SUN RAM 12 with Sport Devices upgrade |
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| Hi all, i have a SUN RAM 12 Dyno with Sport Devices control system. I need to input the roller inertia figures ( in kg/m2 ). Does anyone know the figure for this dyno ? |
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StantonWarrior
Joined: 10 Dec 2010
Posts: 188
Location: UK
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| Posted: Mon Apr 30, 2012 12:14 am Post subject: |
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| If you post up the dimensions I can calculate it for you. |
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D DEV
Joined: 20 Feb 2012
Posts: 25
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| Posted: Mon Apr 30, 2012 9:03 am Post subject: |
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| Hi, do you need the retarder dimensions too ? |
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StantonWarrior
Joined: 10 Dec 2010
Posts: 188
Location: UK
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| Posted: Mon Apr 30, 2012 1:33 pm Post subject: |
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| The retarder is harder, it might have the MMI stamped on it somewhere, or check out any part numbers with the manufacturer.... |
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D DEV
Joined: 20 Feb 2012
Posts: 25
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| Posted: Mon Apr 30, 2012 1:46 pm Post subject: |
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| The roller diameter is 320mm & length 750mm ( 4 rollers in total ). |
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D DEV
Joined: 20 Feb 2012
Posts: 25
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| Posted: Mon Apr 30, 2012 3:31 pm Post subject: |
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| found the tech info on the retarder it has a mass of 67kg exactly |
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Adam
Joined: 02 Dec 2011
Posts: 26
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| Posted: Mon Apr 30, 2012 3:33 pm Post subject: |
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Another option is to download the demo version of L&S dynomax pro. It has a inertia calculator that is quite good and from memory has typical values for the common retarders etc.
You will also need the wall thickness of your rollers, shaft diameters & lengths, any couplings, etc... |
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gsportcars
Joined: 19 Oct 2009
Posts: 58
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| Posted: Tue May 01, 2012 1:48 am Post subject: |
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I will also neee the same information for my Maha LPS2000 as I am installing the Sportdevices system in the near future.
I was hoping to obtain the info from Maha themselves but not sure they would ne able to supply it. Other than that, I will prob try Sportdevices or the Land and Sea calculator as mentioned above. |
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StantonWarrior
Joined: 10 Dec 2010
Posts: 188
Location: UK
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| Posted: Tue May 01, 2012 4:47 am Post subject: |
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Specific mass isn't important, its the MMI you need.
Dynomax demo is a very good shout. You'll be able to build the rotating system using their pre configured figures.
Then when you do your coast down runs to determine DYNO losses you'll be able to tweak the figures to give a realistic output. |
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