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Old 08-07-2006, 11:54 AM
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Relation between RPM and speed and power

Hi,
I would like to know how rpm of an engine is related to the speed of the vehicle and its power. Nowadays since I am carpooling to work, I am observing the cars of my carpool mates. Everyone is having different cars, Lexus, Audi, Toyota, Benz, Nissan. Among those I noticed some differences in Audi, Lexus and Benz. Particularly Audi, even when she is doing freeway speeds its rpms stay between 2k and 2.2k while for benz it stays around 2.5k and 3k while for Lexus its same as Benz. Also while I am watching some previous episodes of TopGear, they tested the Vauxhall -Monaro and at 65mph it stays at 1.5k rpm. I know they all have different engine capacities, powers etc. But how can we realte between those parameters??

-Pavan
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Old 08-07-2006, 02:49 PM
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rpm vs. cruising speed is related to transmission gearing and final drive ratio.
the svx at 60 mph with stock gearing is at 2k rpm. If you put in a 4.11 or 4.44 transmission the rpm will be higher at 60mph.
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Old 08-07-2006, 03:48 PM
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I think, more specifically, the question is why did the manufacturers choose the final drive they did.

To me it seems to be related to torque range, efficiency and top speed.
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