With Krazik's larger diameter tires stock gearing is a bit too high. 4.56 might be ideal in that case, or maybe even 4.44.

There is a discernable acceleration difference between 3rd gear stock and 4th gear 4.77, and these speeds do overlap quite a bit.

 

I haven't autocrossed or tracked my car yet with the 4.77s, but I can't see what scenario they would not be favorable over 4.10s, unless you actually top the car out.

When autocrossing, I hate having to shift between 1st and 2nd constantly. I would much rather be able to use 2nd everywhere with an occasional change to 3rd.

On a track, the 4.77s will just make 6th gear a useable gear, which means that you have another gear choice for any particular part of the course. The chance of having the "perfect gear" for each component should be greater.

 

[QUOTE]Originally posted by gernby
I haven't autocrossed or tracked my car yet with the 4.77s, but I can't see what scenario they would not be favorable over 4.10s, unless you actually top the car out.

 

Every course is different, but the autocrosses that I have been attending require the top of 1st, all of 2nd, and the bottom of 3rd. With 4.77s, I expect to use all of 2nd, and all of 3rd (no 1st). I think this will result in less shifting.

 

You need to remember that just like the graph below shows...

http://gallery.s2ki.com/imagecatalog/custo...mageview/92603/

A lowered geared car generates more wheel torque only for certain segments of its MPH band. At some points its generating quite a bit less torque than a normaly geared car.

Dont get me wrong though, i do agree that there is a benifit to lower gearing, its just not 16.3%.

 

[QUOTE]Originally posted by gernby On a track, the 4.77s will just make 6th gear a useable gear, which means that you have another gear choice for any particular part of the course.

 

[QUOTE]Originally posted by davepk

 

My argument is with the notion that you have a choice of which gear you are in.

Its pretty much assumed by all who track the S2K that dropping out of VTEC is something you dont want to do. So, the goal here is to remain in VTEC at nearly all costs.

In a 4.1 geared car at 75mph there is only one gear to be in and thats 3rd. 2nd is above RL and 4th is below VTEC. For gears 1 thru 5 upshifting at RL will get you to just above VTEC in the next gear, visa versa for down shifting. 5th and 6th are spaced closer so there is more overlap available, in that case you do have a choice of which gear you could be in and still be in VTEC.

 

1st thru 4th are not a whole gear lower so its not like every where you used 3rd you would automatically use 4th w/ the 4.77s.

If all the 4.77s did was move every get down 1 then there would be no use for them. You would have just removed the need for 1st.

Using the 75mph corner dave talks of you would be just below 7krpm in 4th vs 7500 in 3rd in a stock car. But you would be able to run in 4th to 100mph where as you would need to shift to 4th in a stock car to get to 100.

So you would get out of the said corner faster and would actually go farther before you had to shift.

 

Actually, it looks to me like you'd be around 6700 RPM in 4th and not making nearly the same power as you'd be making at 7400 RPM in 3rd powering out of the corner. Add in the shift to 4th to get to 100 MPH and you'd probably get there at about the same time as the 4.77 car IMHO.