General Category > General Discussion
Poor mans dyno, SB Hotrod roll on remote compare
jacksonracingcomau:
To not derail the 3 SB hotrod threads and maybe useful to all
Looking at the free GPS software I've put on my tablet
It has acceleration recorder, exactly all a rolling road dyno like a dynojet really is.
Mine only tells you current and max but must be easy to record acceleration and time and then graph them.
Then 60mph roll on in top could be shared between the Aero, the 4 valve neuvo and the hot Lario
Here's mine today, quick blat from 60mph in top
Only 90 cos it's wet, bumpy roads, cops etc
Have no idea why it's in metres per second per second when it's supposed to be in imperial but think Chuck probably works in G's anyway so that should be unit to use
For reference between 60-90 I hit 2.0496 G's today in top gear (conversion from net, NFI if true)
Wasn't trying for number but normal braking in wet at -13.16 m/s 2 is still -1.3419 G's !!!
For nothing we can test acceleration & braking & compare, wind or gradient use considered cheating.
For tuning, why pay for a dynorun ?
Think I hold the record for now, king for a minute ?
Chuck in Indiana:
So, what's the name of this free GPS software? What operating system? It's highly unlikely that the four of us will ever be in the same place for a proper roll on.. ;D Yep, you're king for a day, and probably the contest.
charlie b:
Put in exact weight of bike and rider, record rpm at each point. Get torque and HP.
Rough Edge racing:
Looks like a useful tool that's for sure... I use chassis dynamometers frequently for my race bike and the often mentioned Dynojet is a inertia dyno...The rear wheel spins a weighted roller and the dyno measures power from the time it takes to accelerate the roller. They work for tuning but give exaggerated power readings.. and that's why they are popular..and the fact although expensive are the less expensive dyno... Eddy current or brake dynos apply a load to the engine and actually stall the engine ...
Watch and hear this 830 Hp V8 struggle to overcome the dyno brake...
https://www.youtube.com/watch?v=TsNKGQozXvQ
Triple Jim:
--- Quote from: jacksonracingcomau on March 28, 2015, 01:02:48 AM ---For reference between 60-90 I hit 2.0496 G's today in top gear (conversion from net, NFI if true)
--- End quote ---
Very nice. I've heard about apps like that. I have a Veypor vehicle computer that does this sort of thing, automatic 1/4 mile timing, etc., but an app is a lot cheaper.
Recording more than a 2g acceleration in any gear probably means you need to throw that run away and record another one. The Veypor actually has an accelerometer in it, probably to avoid glitches in position that cause odd accelerations like that. And why does it say your average speed was zero?
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