Quote:
Originally Posted by SilentBob420BMFJ
first off, id like to thank everybody for explaining..
but isnt hp a measurement of torque and rpms? meaning you have to either have lots of torque or high rpms to make a car fast.. i dont understand where these curves on dynos come from tho, are they from the engine or from switching gears? like what makes a torque or hp curve..
im going to go read several articles on tq/hp/rpm and get more educated, then i will be back
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The torque curve comes because the engine makes varying amounts of power at different RPMs. There is a certain RPM where the engine will make the peak amount of torque. This curve and the point of peak torque depends on the design of the intake, exhaust, cylinders, pistons, valves, cams, etc., etc. By changing any of these things you change the torque curve.
This is why v-tec works so well. If the car simply made more power with the higher profile cams they would simply put high profile cams in and call it a day. However, at low RPMs a lower profile cam makes more torque. Once the engine gets to the point that torque starts to drop off because the RPM is above the peak for that cam profile the v-tec engages the higher profile cam and esentially changes the torque curve to keep the engine making torque.