02GF74
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 posted on 4/4/08 at 08:31 AM |
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speedo: digital readout question
quetion for those with a speedo with digital readout
1. what is resoultion of rpm? (minimum rpm step it can display)
2. how many times per second is the rpm updated?
If you are not happy with either of those parameters, what would you have for resolution and for updating?
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coozer
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| posted on 4/4/08 at 08:45 AM |
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Depends which one you've got, if by chance it's an Acewell, the same as mine i have the input setting at 0.5 which matches the rpm output
on my Megajolt map on the PC.
Steve
1972 V8 Jago
1980 Z750
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02GF74
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| posted on 4/4/08 at 08:48 AM |
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I don't have one - much prefer a dial.
What does 0.5 mean in relation to the above questions?
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Guinness
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| posted on 4/4/08 at 09:01 AM |
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I have the VR2 from Veypor.
It is completely user adjustable. It can show in units of 1, 5, 10, 50 etc etc, and the refresh rate is completely adjustable too!
HTH
Mike
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02GF74
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| posted on 4/4/08 at 09:07 AM |
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^^^^ right, we are getting warmer.....
so what setting do you find usable and have it set to?
Let me try another angle.
If I gave you a digital rpm diplay that had resolution of 200 rpm and refresd=hed at say 3 times a second, would you be happy with that?
I mean, if you were caning along and display showed 4,000 rpm, would it matter to you if you engine was doing somewhere in between 3,801 and 4199
rpm?
and if so, how and why?
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iank
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| posted on 4/4/08 at 09:47 AM |
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Never seen much point in rev counters personally beyond looking good.
Rev/shift lights yes. But the only time rev counters (especially those with numerical displays rather than bars) seem be useful is when
'learning' to get the best from a new model of engine or debugging faults.
Any other time you should be looking at the road or for the apex rather than studying instrumentation.
All MHO, I'm sure others will disagree.
Someone here made their own digi-dash based on an fpga, that had instant readout on a long LED bar even on a BEC, it's not hard if you use fast
hardware and measure pulse width rather than count pulses.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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