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+--- Thread: Madison MOtorshow and Dryft DynoDay!!! (/showthread.php?tid=5612)
- HAULN-SS - 03-29-2007
1HP = "a strong horse could lift 150 pounds a height of 220 feet in 1 minute."
feet per minute
thats where your RPMs come in
- .RJ - 03-29-2007
HAULN-SS Wrote:which is where "quick as possible" comes in
The little computer measures the rate of acceleration of the dyno roller.
So, in theory, yes there is "time" since its the the 2nd derivitive of speed, but you would be really reaching for that one.
- white_2kgt - 03-29-2007
HAULN-SS Wrote:1HP = "a strong horse could lift 150 pounds a height of 220 feet in 1 minute."
feet per minute
thats where your RPMs come in
bahahahahhhah, lookup the actual definition of Horsepower as it relates to cars please and tell me how it is measured.
- .RJ - 03-29-2007
HAULN-SS Wrote:1HP = "a strong horse could lift 150 pounds a height of 220 feet in 1 minute."
The dyno doesnt even measure HP anyways - its calculated based on Tq.
- HAULN-SS - 03-29-2007
clearly, you wrap that distance around your spinning drum...i'm quite sure the more feet you go in a minute, the more power you have - so why would I spin the drum up slowly to my max RPMS? that wouldnt make sense...time is clearly a factor
- .RJ - 03-29-2007
HAULN-SS Wrote:clearly, you wrap that distance around your spinning drum...
No, the weight of the drum is whats calibrated. Not the size. Its spinning the same speed (RPM) no matter how large it is.
HAULN-SS Wrote:that wouldnt make sense...time is clearly a factor
Maybe in your fucked up reality.
- CaptainHenreh - 03-29-2007
HAULN-SS Wrote:clearly, you wrap that distance around your spinning drum...i'm quite sure the more feet you go in a minute, the more power you have - so why would I spin the drum up slowly to my max RPMS? that wouldnt make sense...time is clearly a factor
The drum is a known weight, which you are accelerating. The roller diameter only plays in measuring that weight and how far it accelerates.
You really, really need to learn how this stuff works.
- white_2kgt - 03-29-2007
HAULN-SS Wrote:clearly, you wrap that distance around your spinning drum...i'm quite sure the more feet you go in a minute, the more power you have - so why would I spin the drum up slowly to my max RPMS? that wouldnt make sense...time is clearly a factor
You don't have to do a clutch dump in order to measure power.
- HAULN-SS - 03-29-2007
oooo..weight huh? so they have 150lbs..or some other calibrated amount for weight in the drum -and they can use that amoutn of weight over the length of the circumference of the drum?
- .RJ - 03-29-2007
HAULN-SS Wrote:and they can use that amoutn of weight over the length of the circumference of the drum?
:?:
If the drum is 12" in diameter or 12' the rotational speed (RPM) is the same. Of course, the larger the drum the more it weighs. Thats calibrated.
- HAULN-SS - 03-29-2007
well, anyway, it doesnt matter - the point is, you dont think it'll be rough on a car that can drive under its own power huh? Cause it's slipping like mad, I didnt want to do such a rough "launch" that it blew shit up
- .RJ - 03-29-2007
If the trans blows up on the dyno, it wasnt going to make it home anyways.
If its already slipping why are you going to drive it *anywhere* ?
- HAULN-SS - 03-29-2007
im saying - according the definition of HP, you have to move some weight some distance - so the bigger diamteryour roller drum is, the less full rotations need to happen to cover that distance
- CaptainHenreh - 03-29-2007
HAULN-SS Wrote:well, anyway, it doesnt matter - the point is, you dont think it'll be rough on a car that can drive under its own power huh? Cause it's slipping like mad, I didnt want to do such a rough "launch" that it blew shit up
It's no different from doing a pull from a rolling start on the highway.
On the highway, you're accelerating your car.
On the Dyno, you're accelerating the rollers. (A known weight, that's how they know how much torque you make and, by calculation, how much horsepower.)
- HAULN-SS - 03-29-2007
I wanted to dyno it to do a before/after comparo how much power you lose through a slipping transmission - when I put a new one in later this summer
- .RJ - 03-29-2007
HAULN-SS Wrote:im saying - according the definition of HP, you have to move some weight some distance - so the bigger diamteryour roller drum is, the less full rotations need to happen to cover that distance
No retard.
HP is a mythical figure. It doesnt really exist, its a calculated value.
HP = (RPM * Torque)/5252
- CaptainHenreh - 03-29-2007
Horsepower is an function of torque over time. It's got nothing to do with weight or distance.
- HAULN-SS - 03-29-2007
you clearly don't know where that 5252 comes from them.
It's rotations it would take to go around a 1' diameter circle to get to 220 feet, times 150 lbs
- .RJ - 03-29-2007
HAULN-SS Wrote:you clearly don't know where that 5252 comes from them.
It's rotations it would take to go around a 1' diameter circle to get to 220 feet, times 150 lbs
:?: ^w-t-f? :?:
I'm done. Educate yourself, even if you only use wikipedia so that you can remove your head from your arse.
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- HAULN-SS - 03-29-2007
actually..it just came to my attention, the RPMS cancel out