NEW STOCK RS4 1/4 MILE RECORD - 12.75 @ 108.36

[BenSti]

Saki, you didn't happen to work in San Jose previously did you? I know another Scottish guy named Ian who is really tall.

[sakimano]

Originally Posted by swesna

@Saki -- you should become an internet detective or teach classes on this. WTF do you do for a living? you seem to have a lot of time doing these searches and compiling this type of information.

took a grand total of...

Originally Posted by google

About 2,490 results (0.33 seconds)

[swesna]

Originally Posted by sakimano

took a grand total of...

very efficient.

[B6JoeS4]

Originally Posted by ELEVENS

Mr. Aigenstein does a fine job of explaining things. Ignore the facts and attack the source if you like - that's been your M.O. here and everywhere. But it doesn't change those facts, they're all true. Including my lost friend and his wife, and our Corvettes, and the racing we enjoyed, and the outcome of those races.

Wait now you're saying Aigenstein is your friend. Aigenstein is actually my best friend, and he said he doesn't know you. He also said to give you a swift kick in the *** for plagiarizing his work

[swesna]

Originally Posted by B6JoeS4

Wait now you're saying Aigenstein is your friend. Aigenstein is actually my best friend, and he said he doesn't know you. He also said to give you a swift kick in the *** for plagiarizing his work

BJob -- maybe you should learn to read. elevens never said he was friends with Aigenstein.

[SpeedETC]

@ELEVENS, sorry to hear about your friends. I had a few friends move on from this world in similar incidents as well as others that have permanent injuries. I know how you feel.

Back to the topic - In regards to the comment below:

Originally Posted by ELEVENS

In a nutshell, torque is king if it’s measured at the crankshaft. But it’s not. We have transmissions. And transmissions multiply torque. So what’s important is torque at the real wheels, which makes the actual complete answer horsepower because horsepower encompasses not only the engines torque but the total torque that gets put to the ground to accelerate the vehicle.

Horsepower isn't a measurement of torque at the wheels. Technically that is wheel torque. Horsepower at the wheels is still a calculated value based off of torque and rpms. The transmission being a torque multiplier simply means that is it multiplying the torque output produced by the engine so it can twist the drive shaft with a certain amount of force. e.g. if a vehicle puts out a peak torque of 300 lb-ft of torque and the gearing is 3.3:1 for 1st, the peak torque output is 990 lb-ft at the drive shaft in that gear.

Getting back to the original discussion about shift points, I think the waters have been muddied. The horsepower vs torque discussion is a very old debate which isn't going to be settled in this thread in regards to what figure make a car faster on the track. But, when it comes to calculating the optimum shift point for a vehicle the torque curve is what is used. Again, you can get close by using horsepower - the main reason for this is peak horsepower is the point where your torque curve is falling off quickly. You want to shift at the point to maximize your acceleration and you are always going to accelerate the fastest where your torque is the highest.

To sum it up:

Originally Posted by ArthurPE

first power = work/time
and work = force x distance
and force = mass x acceleration
power is a derived or secondary vairable P = torque x rpm, so we deal in torque (and can determine HP if need be) since torque is an instantaneous primary varible
torque = force (or thrust) x radius (lever arm), torque is sometimes called the moment

thrust is what motivates the car, and if we know rear axle torque
= (crank torque x tranny ratio x diff ratio) x loss factor
and if we divide axle torque by wheel radius we get thrut in pounds, and THAT is what propels the car

accel = Force/mass, so if thrust is increased or mass decreased, car accelerates faster

back to shift point
you want to shift when the higher gears axle torque becomes LESS than the next gears...
assume torque
4k rpm 200
5k rpm 200
6k rpm 175
7k rpm 150
8k rpm 125

let's say
3rd overall ratio is 10 and 8 in 4th (so shifting at 8k in 3rd to 4th rpm's go to 8/10 x 8 ~6400)
axle torque
rpm...3rd...4th
4k....2000....1600
5k...2000....1600
6k...1750....1400
7k...1500...1200
8k...1250....1000

so at 7k 3rd makes 1500 and shifting to 4th (8/10 x 7k ~ 5600) ~ 1500
at 8k 3rd ~1250 and 4th (8/10 x 8 ~ 6400 rpm) 1300
we want to shift a bit over 7k in this case to optimize acceleration

these points are easily calulated by puting the axle torque for each gear on a graph vs rpm, where the next higher gear overlaps the lower one is the shift point

[sakimano]

Originally Posted by swesna

BJob -- maybe you should learn to read. elevens never said he was friends with Aigenstein.

True. He didn't.

Elevens said he IS Bruce Augenstein.