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blueminivan
 Post subject: Spi 1275 RPM/KPH
PostPosted: Fri Jul 04, 2008 7:20 pm 
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Joined: Fri Mar 16, 2007 7:56 pm
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Location: Warracknabeal Vic.
Does anyone know the rpm in the appropriate gear for each of the speed limits?
I've got an SPi 1275 with an unconnected speedo cable.(hopefully).

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Clubby74
 Post subject:
PostPosted: Fri Jul 04, 2008 10:59 pm 
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Location: Burnie, Tassie
Not directly but

Engine speed = Vehicle speed x Wheel rotations per km x diff ratio x gear ratio / 60

So I guess with a bit of google or maybe a search on here you will find your ratio's and a tape around your tyres will get you the last missing piece.
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blueminivan
 Post subject:
PostPosted: Fri Jul 04, 2008 11:35 pm 
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Location: Warracknabeal Vic.
Yeah OK thanks for the tip.....
But surely there's a few people out there that drive via the tacho that could give me a rough idea.

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wyan
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PostPosted: Sat Jul 05, 2008 9:56 am 
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Mine was an Mpi but converted to carb now.. 70kms in forth is about 2500RPM and 100kms is about 3500-3600kms I think from memory.
My 1st gear is pretty short also.
Does this help?
cheers
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Number86
 Post subject:
PostPosted: Sat Jul 05, 2008 10:47 am 
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Diff ratio in my SPi is 3.44:1 (standard I believe), although I haven't driven it yet, this is the same ratio as my S. This makes 80km/h 3000rpm in fourth, 100km/h just under 4000. Hope this helps.
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blueminivan
 Post subject:
PostPosted: Sat Jul 05, 2008 5:31 pm 
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Location: Warracknabeal Vic.
Thanks for that.
I only needed a rough idea until I fix the problem.

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