Toymods Car Club Inc: Tech & Conversions => More Torque or more Horses ?

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mrshin
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Location:
Montrose, VIC
Registered:
May 2002

Re: More Torque or more Horses ?	Sat, 14 September 2002 12:09

Well, to get back to the basic part of it - Horsepower equals torque (in Ft-Lbs) x RPM /5252. Sooo... a big arse Kenworth Cat Diesel still only might make a 'paltry' 600Hp, but this is done at, say, 1800rpm. A japanese GTR drag car might make 1400hp@11,500rpm, but I'd sure as hell like to see IT pulling 50 tonnes of road train! To increase the HP of an engine, you must either increase torque, increase the RPM at which the same torque is produced, or increase both. When messing with an NA engine, the usual mods such as cams, porting, etc. generally don't give a massive increase in torque, but shift the torque band up the RPM scale, allowing more HP. Fitting a turbo increases cylinder fill, which makes a bigger bang and increases torque, as well as (often) allowing the engine to breath to higher RPM, thereby giving a massive increase in HP. The Type R produces its best power from 6000-9000RPM, whereas the nissan does so from 4000-7000RPM. If you nail the throttle on the Honda at 3000rpm, you only get so much, whereas in the Nissan you'll get a lot more excitement. Conversely, the Honda will be much happier at 8000rpm than the Nissan. This is because the Nissan produces its power at lower RPM with more torque, but is incapable of breathing well enough to rev productively to 9000rpm, whereas the Honda has a lower torque output, but can breath freely to 9000rpm thereby still producing similiar power to the Nissan. [Report message to a moderator]

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