Re: RPM at a true 60 MPH
Posted: Sat May 15, 2021 2:14 am
1owner69Elan wrote:2620 rpm @ 60 mph
3060 rpm @ 70 mph
3495 rpm @ 80 mph
3935 rpm @ 90 mph
3.94 diff ratio (effective) - uncompromised acceleration
That sounds perfect
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1owner69Elan wrote:2620 rpm @ 60 mph
3060 rpm @ 70 mph
3495 rpm @ 80 mph
3935 rpm @ 90 mph
3.94 diff ratio (effective) - uncompromised acceleration
TBG wrote:1owner69
I don't understand your figures! Those quoted are almost a dead match for my 3-1 diff. and you are running
nearly a 4-1. Can you explain where your high ratio comes from please?
My figures 4 speed box an 3-1 diff
2620 rpm @ 60 mph 2700@60 mph
3060 rpm @ 70 mph 3100@70 mph
3495 rpm @ 80 mph 3500@80 mph
3935 rpm @ 90 mph 4000@90 mph and 110 mph @ 5000
3.94 diff ratio (effective)
tdskip wrote:Jiggled it and handbrake released so here is the GPS data
Tach | Actual RPM | Speed
4500 | 3400 | 60
5000 | 3800 | 66
1owner69Elan wrote:tdskip wrote:Jiggled it and handbrake released so here is the GPS data
Tach | Actual RPM | Speed
4500 | 3400 | 60
5000 | 3800 | 66
From my calculations, pretty close to your actual observed:
3400 rpm = 61.0 mph
3800 rpm = 68.1 mph