Hey wassup. Hmm, I wanted to get it straight because I have many different ways to racing a s2000, told from different people. Ok, ok .. Launching is understood. But Some S2000 Race a 1/4 mile and shifts out of first as soon as possible? and some shift at redline & some shift at 9000rpm? I DON'T KNOWW!!!! What's the best, fastest and safest way?? thanks.

 

Go dyno your car.
Fastest MPH at the 1/4 will result when your shifts land you at at the highest possible HP each shift...taking it to 9k is probably your best bet, since that drops you to just above 6k, keeping you in VTEC. On a STOCK 03, your peak HP is about 195 to the rear at 8500, dropping to around 180-185 at redline. If you shift at 9k, you'll land just above 6k, where you're still making about 150 rwhp. You'll be losing 10-15 hp up top, but gaining 20-30 on the shift compared to if you shifted up at 8500, where you peak, landing you around 5600, where you're only putting down 110-120 hp.
As far as times go, the same applies, but look at your torque curve. You want to shift at the point where you will drop into the next gear at the highest possible torque. Depending on your powerband, it may be a quicker ET for you to shift earlier if your torque band drops off too much up in the revs.

Remember, fastest mph and quickest ET rarely come from the same shift points. HP makes speed. Torque acounts for time.

 

wow. thanks wildcardman lol.

 

What?

HP = Torque x Engine Speed.

I'm not sure how you can have the optimal ET without optimizing your trap speed, too.

 

The right way to race an S2000 is NOT 1/4 mile at a time. . .

Unless its on a short autocross course.

 

 

HP and torque can be mathmatically derived from eachother, you are right (but your equation is wrong, it should read Hp = rpm x torque/5,252
Conversely, to calculate torque the equation is:
Torque = 5,252 x hp/Rpm). It would be a very long differential equation to explain why the 2 variables result in seperate yet dependant results in the 1/4 mile, but this simple diagram should help:


As you can see here, the redline shifts result in less torque per RPM area under the curve over the course of each gear than you would get if you shifted at 8300 RPM (in my car...results may vary...batteries not included...), and torque over time is where your ET comes from.

Your top speed is a function of horsepower vs time, and follows the same principles, but on the horsepower curve instead of the torque curve.
As you can see by looking at my dyno, my top speed would be much faster at the end of each gear if I took it to readline each time, as the area under the horsepower curve is much larger than that of the 8300 shift curve, but I'm not making as much torque. So you see...in my car...my fastest mph and my quickest ET do not come from the same shift points.

This is why you only get a HP graph when you dyno without the coil pickup...the dyno can convert mph to watts to horsepower, but cant tell you your torque without knowing what RPM your engine is turning. Speed is not a function of engine rpm. Torque is.

Google it if you don't believe me. I need to get back to my homework now

 

Looooooooooooooooooooooooooooooooooooooooooooooooo ooooooool!

 

racing...? what type

street racing? (no no no)

1/4 mile...

I don't think that a real question was asked.. so it's hard to get a real answer.


You have many different ways to "racing a s2000"... wtf?

I'm just confused


I'm guessing that you're not going to track days, I'd suggest search, but i don't think that's even warranted here


/endthread

 

Oh my dear lord.