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Power = Force X Distance / Time HP is roughly calculated with: Torque x Rpm / 5252 5252 is some conversion factor I don't have the heart to research right now. Speed of the engine torque is applied at gives you the amount of power the engine is producing at RPM. Something like 10m (~33ft) cable with a 10kg (~22lbs) weight attached, and you have a spool/drum to do a vertical lift. I'm in metric sorry for those who use the imperial. The force is 10kg x 9.81m/s2 (gravity), distance 10m. Two electric motors lift the weight up vertically. One motor takes 20 seconds the other 30 seconds. They didn't do the same work despite delivering the same force: (98.1N X 10m / 20s) = 49.1W : In 1 minute this motor can lift 10kg 3 times. (98.1N X 10m / 30s) = 32.7W: In 1 minute this motor can lift 10kg twice. Also the RPM of the spool will be different: I'm sure you can figure out which is faster. It's hard to explain, I hoped going liner (strait line) helped. ____________ People try to keep RPM low. Fuel economy, engine wear, noise etc... The way to counter lack of power at daily driving speeds is an increase in torque. This is achieved through drive-train design. Hence when SUB says his RSX is gutless because it has little torque, what he means is it develops insufficient power for his liking at low rpm (or the whole range););). |
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In torque-centric terms, the high rpms at which F1 motors operate allow a relatively large gear reduction and fairly significant torque at the wheels. Please ignore the fact that I'm saying Torque x RPM is what matters. :D |
Anyone want to overlay some rpm drop by gear over this graph? Throw in some wheel torque figures by gear too?
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Did we get gear ratio info while I wasn't looking?
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Edit: http://www.ft86club.com/forums/attac...9&d=1326573273 |
Yea, I almost have them memorized already rofl. 4.1f/d (or 3.727 non-lsd), 3.626, 2.188, 1.541, 1.213 (had to look these two up), 1.000, 0.767. Wheel is 24.6 inches I think. Okay 24.61 or 625mm.
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Auto = Red Purple = Manual 5th and Auto 4th Attachment 4646 Attachment 4647 It looks like the car would benefit from a few more rpm up top, even without any mods. |
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Here it is with 15% drivetrain loss.
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Thanks for sharing the graphs guys, that helps a bunch.
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I love it when you guys get technical
I get to learn something new all the time |
Based on Subau's history of horrible tunes on the STI, I wouldn't be surprised if the torque dip is due to emissions/economy, but time will tell. If it's anything like their turbo tunes, the dip would be where the AFRs drop from too lean to too rich... :thumbdown:
That would certainly be a good thing- it would be straightforward to tune out. Found a quick example here with AFR: http://www.iwsti.com/forums/2731193-post16.html http://i48.tinypic.com/2rz5qnk.jpg |
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Here's a rough estimate for comparing acceleration of the BRZ and WRX. As expected, once the WRX hits boost the BRZ never matches it. Still, I was a little surprised to see that:
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^^^ the virtues of a 6 speed gearbox. Actually, having a lot of pull in 6th gear isn't really a good thing IMO since an overdrive gear should be optimized for 50-80mph range efficiency, but the closer ratios in between are definitely helping.
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... and it doesn't account for the WRX's, um, brick-like aero =) |
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How did you add drag in? CdA 1/2 \rho v^2?
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