I'm going to be updating this thread with links to other threads that are very helpful in the gear topic. Maybe we can make this a sticky so we don't have people asking about it constantly.

Alright, I think we're getting close to 19.6582 threads a day about what gears do, and what effect they have on our car. I brought out my trusty Windows XP calculator and came up with this information:

Stock: 4.1
4.44
4.56
4.77

4.44-4.1 = .34 difference
4.56-4.1 = .46 difference
4.77-4.1 = .67 difference

(following is rounded off and edited as per xviper specs )
.34/4.1 = .08
8% change

.46/4.1 = .11
11% change

.67/4.1 = .16
16% change

Now, assuming we have 200 rwhp:

200*.08 = 16hp
200*.11 = 22hp
200*.16 = 32hp

So, in essence, the %increase in gearing will make your car feel like it's gained 16hp with the 4.44, 22hp with the 4.56, and 32hp with the 4.77.

Remember, GEARS DO NOT MAKE HORSEPOWER! They simply make it easier to acellerate. Imagine instead of having your 6 speed transmission, that you now have gears .5 - 5.5 instead of 1-6.

This is purely hypothetical, in that it assumes you make 200 rwhp. Take it for what it is

 

gears!!!!!!!!!!!!!!!!!!!!!!!!!!! mine are getting shipped tomm with new o4-05 diff form hard top guy!!!!!!!!!!!!!!

 

Well then enjoy the extra 22 horsepower they give to you!!!!!!!111one1

 

You can't express delta in both terms (ie, 2 decimal places AND %). That is to say, if you put down ".08", this already means 8%. ".08%" would translate to ".0008"
For example:
4.44 gives you ........... 8.3%
4.56 gives you ........... 11.2%
4.77 gives you ........... 16.34%
(Change)

(Just a little nit pick.)

 

4.56 on order also.

The 4.77 are like going down a gear (at least in higher gears). So if you have 4.1 gears and want to see how buzzy they are on the highway, just drive around in 5th gear. That's near the engine speed you'll be at with 4.77 in 6th gear.

So in essence the effect of gears are mostly apparent in lower gears and at take-off or at low speeds when the stock gears will have you lower in the power band. And also when doing redline acceleration.

For example; 4.77s will make 4th gear feel stronger, but you just as well could have stayed in 3rd and gotten similar effect (ie higher engine speed and quicker acceleration).

Note: my example (above) is for normal driving. Obviously if you shift at or near redline with stock or 4.56 or 4.77s, the 'gears' will be quicker. I'm just talking about day-to day driving. If you want more pep on the highway or around town with stock ratio, you can stay in a lower gear (higher in the power band).

 

noted!

lol you know what I meant

 

So,if I want to re-calibrate the odo/speedo,with 4.56 gears,using the yellow box,there an 11% difference;right???
Any experience,on these yellow box install?
-Emil.

 

I think this post should help you out Emil:

https://www.s2ki.com/forums/index.php?showtopic=205311

Basically you correct the difference, and subtract how much your car is off already I think? At least that's what I gathered from glancing over this post for 30 seconds. I'm sure reading the entire thread will help answer your question. Keep in mind though, that they used the 4.57 gears as an example.

 

Thank's,I just ordered 4.56 from Rick;and a yellow box!!!

 

I know you know. It's just that my old math degree just couldn't leave it alone.

Yes, this is more or less correct. If you dial in the exact % compensation of the gears, you will have the exact same speedo error that you had when the car is stock. A stock S2000 can exhibit anywhere from 0 to 2% error naturally. To know for sure, you must use some sort of electronic measuring device or be paced by a police car. I confirmed mine by those radar signs that they set up on the highway to put the fear of God into you.