I am curious if my old 4.400 final gear would bolt into a 4.28-equipped tranny with no problems. Since I have no use for my old final drive set, i'm going to try to sell it to someone with the 4.28 final such as the common 1st gen B-series trannies, or the Integra LS/RS etc.

Thanks, oh and whoever reads this, another question: (Katman probably knows)

Is the final gear in the new 99-00 Civic Si a 4.400, or 4.28?

I say 4.400, but Katman's FF chart says 4.28. I did a second gear cruise in my at 30mphcar and spun 4000rpm with my 4.400, and then drove my fiancee's B16A2-hatch and hers spun 4000 at 30mph too. this would lead me to believe that they are the SAME exact gearing, final drive and all. This is what I've always believed, but Katman is very knowledgable and perhaps he knows something I don't here.

It also seems as though the revs drop the same in both cars too.

 

Si has 4.4:1 Final Drive. Same as all other Y21 trannies . . .

 

well, what is your 4.40 from? if it is out of a 99-00 si, it will not work in a integra tranny without selling him your diff also.

 

err..I put 4.266 on the Si coupe FD specs not 4.28 ....blah..but anywho...
I found out that the Si coupe has a longer FD ratio according to the Helms manual for the 99+ Si coupe....but that's actually debatable...
I guess I should say that on my tranny spec page somewhere
(which i just updated)
...Although a friend of mine (Eddy Lin) had a spare Si coupe gearset, he counted the FD ring+parts and it wound out to be a 4.40 FD....so yah.. plus some people on hybrid posted up saying they have an LS final drive in their Si coupe trannies...which is a 4.266 also...too many conicidences...so I stuck with the 4.266 FD on my site with a disclaimer though

Looks like you did the rpm-to-mph test....keep in mind this in mind when doing this test: wheel and tire sizes

try your test over again using 1 set of the same wheels and see what your outcome is.


[Modified by Katman, 5:37 PM 11/9/2001]

 

Kat: It's a 4.400. I wont tell you to change your site but....

 

yeah..I have a disclaimer on that page now

 

[QUOTE]plus some people on hybrid posted up saying they have an LS final drive in their Si coupe trannies...which is a 4.266 also...too many conicidences...[QUOTE]

hey katman, no disrespect, but the ls final will not work in the si tranny. unless of course, you use a b18 diff. that's what you meant, right?

 

Kat-

I did the test with my car and my finacee's cars. One with R swap, the other B16A2 swap.

Both have identical Rota Circuit 8's with 195/50/15 Pirelli P700Z tires.

I figured the test to be accurate.

Oh, and the final drive that's 4.400 came out of my S80 LSD R tranny - I figured it'd be a cheap upgrade for any mechanically-minded LS tranny owner.

 

I just talked to Larry Jr. at Import Auto Salvage, and he told me that of the three Si trannies he's torn down, all THREE had the 4.266 final drive. I know my test was accurate though, and the revs dropping the same as my ITR tranny can't be another coincidence. So, here's my theory:

Perhaps they have EITHER the 4.400 or 4.266 final in them. If that's true, then how could we determine which tranny comes with which final drive? I know this might not be the most appropriate forum for this discussion, but the Type R forum has a lot of experienced people lurking around.

Could this final drive difference explain the mysterious difference in performance from one Si to another? I've seen equally-equipped Si coupes run almost a FULL second different at the strip with multiple drivers.

 

A few things to consider here:

TIRE/WHEEL SIZE WILL NOT AFFECT RPM/MPH TESTING BETWEEN TWO VEHICLES!

You're trying to match the RPMs and MPH, right? Tires will only alter the ACTUAL speed of the vehicle - it will NOT change the outcome of RPms vs. MPH on the speedo. Get it? If I've got 15'' wheels and I'm trying to see if my USDM ITR has the same gearing as someone with an Si with 17'' whhels/tires, we can still conduct the test and still be accurate.

How?

Let's say my speedo says 30mph, and I'm really doing 30mph, and my tach says 4000rpms in second gear.

Now let's say the other car's speedo says 30mph and he's really doing 35mph, if his tach reads 4000rpms, then the final drives are the same because the 2nd gears are the same too. Just because the vehicle could really be doing 35mph won't change the correlation between the speedo head and the tach needle.

Does this not make sense? We really need to look at the correlation between the TACH and SPEEDO, not the wheels/tires and speedo. And for your information guys, both test cars have the same stock 1992 Si tach.

 

hmm..
well **** an 99+ Si poupe tranny

...I think the 99+ Si tranny has a weird outcome possibly because of the 1-5th gears being short ratio B16 gears and the 4.266 fd.

Maybe the first year of Si coupes have the 4.266 & the 2000 have the normal 4.40 FD.... it is possible - honda does weird **** like that.

bah who knows, I give up on this Si coupe tranny ****..

 

I know the 2nd gears in the ITR and Si are the same, so that's why I did the test at 30mph in 2nd gear. The B16A2 and tranny in my girl's car are from a 99 Si. This is the one that pulled the same numbers as my ITR tranny.

Weird ****. How many different tranny codes are there in the 99-00 Si coupes?

 

all 96+ DOHC B16 trannies are S4C....even the CTR.