Acceleration improvements with 4.77 gears.
07-02-2008, 09:06 AM
#31
prolly cuz they dont wanna look like a fool if they do have those problems.
Personally, i want to get 4.77's because from what i hear from a few folks who've witnessed this, they said the ap2 with 4.77's can keep up with a superchargered ap1 until about 3rd gear until they pull away.
for me, going from turbo back to NA, instead of going turbo again, i rather not at this moment and feel that the gears will give me that kick that i want for now.
And i've driven a good buddies ap1 with 4.77's and man the car feels light and just goes!
Personally, i want to get 4.77's because from what i hear from a few folks who've witnessed this, they said the ap2 with 4.77's can keep up with a superchargered ap1 until about 3rd gear until they pull away.
for me, going from turbo back to NA, instead of going turbo again, i rather not at this moment and feel that the gears will give me that kick that i want for now.
And i've driven a good buddies ap1 with 4.77's and man the car feels light and just goes!
07-02-2008, 09:08 AM
#32
Former Sponsor
Thread Starter
Yeah eventually I would like to get an AP2 tranny to get the longer 5th and 6thy for the highway and also pick up a little more down low.
07-02-2008, 09:33 AM
#34
Registered User
Originally Posted by 2003s2k2003,Jul 2 2008, 06:37 AM
My mistake in what I said. I will record it and check the time to which speed it gets to, not the gear.
07-02-2008, 09:40 AM
#35
Registered User
Originally Posted by 2003s2k2003,Jul 2 2008, 06:58 AM
^^ Agreed. Many people use 4.77 if they are tracking there car.
The gearing was so short we couldn't even get through a reasonable-sized sweeper without running out of gear. The driver had to choose between shifting in mid-corner (very tricky) or feathering the throttle until car was straightened out (very slow). He was topping out in the top of sixth gear halfway down the straightaways, while my car would have only been in fourth gear and still been accelerating.
Now this was an AP2 car, so it was even shorter-geared than an AP1 would have been. But it represents the extreme case.
You may think I don't know what I'm talking about here, so for background I'll tell you I have about 65 track days in my S2000. How many track days do you have with your S2000?
07-02-2008, 10:36 AM
#36
well the 5th and 6th gear is longer in the ap2 than in the ap1, and the ap2 5th n 6th gears make up some differences. AND have 1 thousand rpms LESS than an ap1.
too bad the ap2 cant rev like the ap1!!!
too bad the ap2 cant rev like the ap1!!!
07-02-2008, 01:08 PM
#37
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Originally Posted by mikegarrison,Jul 1 2008, 11:43 PM
You are wrong. Power to weight is everything, leaving aside limiting factors like the absolute grip level of the tires and aerodynamic drag.
The only reason the car even has a gearing system is that the engine can only provide top power in a certain band of RPMs. Gearing gets you into that band and keeps you in that band. That's all it does.
But I've been down this path enough times to know that most people don't understand as much physics as they think they do, so I'm not expecting to overcome your intuition.
Really quickly, though:
P=A*V
So A=P/V. Gears only come into play in that P is a function of engine speed, which is in turn a function of V and the gear ratio. But while shorter final drives have a power advantage some of the time (when they have a higher RPM at the same speed), they also have a power disadvantage some of the time (when they have a lower RPM at the same speed).
They essentially don't have any significant difference -- except in the launch (because you can't downshift below first gear).
If you look at the graphs that were in that thread referenced earlier, you can clearly see that all the differentiation is right at the start, in the launch.
The only reason the car even has a gearing system is that the engine can only provide top power in a certain band of RPMs. Gearing gets you into that band and keeps you in that band. That's all it does.
But I've been down this path enough times to know that most people don't understand as much physics as they think they do, so I'm not expecting to overcome your intuition.
Really quickly, though:
P=A*V
So A=P/V. Gears only come into play in that P is a function of engine speed, which is in turn a function of V and the gear ratio. But while shorter final drives have a power advantage some of the time (when they have a higher RPM at the same speed), they also have a power disadvantage some of the time (when they have a lower RPM at the same speed).
They essentially don't have any significant difference -- except in the launch (because you can't downshift below first gear).
If you look at the graphs that were in that thread referenced earlier, you can clearly see that all the differentiation is right at the start, in the launch.
07-02-2008, 01:23 PM
#38
Registered User
Originally Posted by DanTheManUK,Jul 2 2008, 02:08 PM
Like I said in the first reply of this thread:
You won't find many numbers on this, because the numbers turn out to be very unimpressive. I suggest you measure them yourself and report back to us.
Acceleration is controlled by power-to-weight ratio, and that's basically unchanged no matter what gearing you have in the car.
But feel free to check out the hundreds of other post threads here about "gears". Lots of people will tell you all about how wonderful they are.
Acceleration is controlled by power-to-weight ratio, and that's basically unchanged no matter what gearing you have in the car.
But feel free to check out the hundreds of other post threads here about "gears". Lots of people will tell you all about how wonderful they are.
07-02-2008, 03:08 PM
#39
Former Sponsor
Thread Starter
Well I will try the camcorder method of recording time to speeds and see if there is a noticeable difference between stock gearing and the 4.77 gears. I have a speedo calibrator coming with the gears so that won't effect the mph.
07-02-2008, 03:17 PM
#40
Registered User
Originally Posted by 2003s2k2003,Jul 2 2008, 04:08 PM
Well I will try the camcorder method of recording time to speeds and see if there is a noticeable difference between stock gearing and the 4.77 gears. I have a speedo calibrator coming with the gears so that won't effect the mph.