K24A1 & K20A3 Trans?

[RHCP0801]

use the ep3 tranny

[thakid]

This is what he said.

Final drive determines what mph each gear ends at (and other things but lets keep it simple). For instance, 02-04 Type-S and 05-06 Type-S 6-speed have the same 1st-6th gear ratios BUT the 02-04 has a 4.389 FD and the 05-06 has a 4.764 FD. The higher the number, the shorter the final drive. The shorter the final drive, the lower the mph achieved in each gear. Remember this last part.

Gear ratios determine RPM drop between each gear (and other things but again, lets keep it simple). The greater the difference between the gears, the further the RPM's drop. For instance, 94-01 Integra LS and GSR share the same 1-2 ratio (3.23 and 1.9). However, they have different 3rd gear ratios (1.269 vs 1.36) thereby giving the GSR a better/closer 2-3 shift. The reason it is better is because the RPM's did not drop further than needed to accelerate in the next gear. ANY performance vehicle wants short/close gearing. That way, every time you shift, you do not fall below your powerband more than needed.

The number of gear selections determine how many times you shift to achieve maximum MPH, obviously. If you have a 5-speed, you're going to shift one less time than someone with a 6-speed. However, if both are trying to achieve the same maximum MPH, the 5-speed will have to sacrifice somewhere.
Here are the gear ratio's of both:

EP3 3.062
1st 1.769
2nd 1.212
3rd 0.921
4th 0.738
5th 4.764
FD

Type-S 3.266
1st 2.130
2nd 1.517
3rd 1.147
4th 0.921
5th 0.738
6th 4.389
FD or 4.764 FD

http://www.k20a.org/forum/showthread.php?t=6395

*notice how the EP3 4th and 5th gears are the same as the Type-S 5th and 6th gears*

So taking what I just explained, the EP3 trans and the 05-06 Type-S trans can achieve the same maximum MPH. However, the EP3 has to shift one less time than the Type-S. Therefore, because it has to shift one less time, it has to make up for the lack of that extra gear by having longer gears. The longer gears drop the vehicle out of its powerband with each shift. The Type-S has to spend fractions of a second shifting one more time. HOWEVER, it gains the advantage of not having RPM's dropping further than needed. Therefore, each shift is more useful than with the EP3 trans.

Now, take what I explained and apply that to the 02-04 Type-S trans. Yes, it has the same gearing as the 05-06 Type-S. HOWEVER, with the longer 4.389 FD, it can achieve a higher MPH IN EACH GEAR. Therefore, you gain the benefit of not having to shift as quickly (or run out of MPH as quickly) as you would with the 4.764 FD BUT YOU ALSO do not have the shitty gear ratios of the EP3 trans. Best of both worlds.

Cliff notes: shitty gearing sucks, good gearing rules, if you're boosted you should have good gearing and adjust your MPH with a longer final drive. Please tell me you understand this.