chi_gsr

Forgive me for a noob questions. I am trying to do some research on my transmission and understand the gear ratio I have, if I can get some help as to what I need to look for to truly know which transmission I have for a better understanding. I believe I have a b16 transmission from a 99 si I check there no lsd stamp nor lsd as I couldn’t see clear thro the trans and it pulls to one side if I gas it so I know it does not have it. I am thinking about upgrading sometime soon to a ITR transmission and I have been looking into specs of each I was provided this link

http://www.zealautowerks.com/transcalc.php

and entered in specs. Is this accurate? Or am I misinformed I don’t want to buy a ITR if my S4C trans gear ratio from my b16 are the same. And all I would really need to do is add in a lsd and I would be good to go. Any info would be great or more information from me to get this correct. I have provided a picture of my trans, it mounted to a gsr motor

Transmission One
Tire Size

Tire Diameter (inches)
Maximum RPM
B-Series D-Series H/F-Series K-Series

Y21/S21/S4C(del sol VTEC & 99-00 SI)



Ratio (:1) Max MPH
1st Gear 3.23 41.4
2nd Gear 2.105 63.53
3rd Gear 1.458 91.72
4th Gear 1.107 120.81
5th Gear 0.848 157.7
6th Gear 0 0
Final Drive 4.4


Transmission Two
Tire Size

Tire Diameter (inches)
Maximum RPM
B-Series D-Series H/F-Series K-Series

Y21/Y80/S80/S4C ( USDM ITR, 95-97 JDM ITR )


Ratio (:1) Max MPH
1st Gear 3.23 41.4
2nd Gear 2.105 63.53
3rd Gear 1.458 91.72
4th Gear 1.107 120.81
5th Gear 0.848 157.7
6th Gear 0 0
Final Drive 4.4

Gearspeed-Performance

iTrader: (1)

No need to upgrade to ITR Trans...Add an LSD to your S4C and you are good to go Essentially the same gear ratio on early ITR. Late 98+ Spec will have a 4.78 Final Drive Ratio...your trans will have a 4.40 Final Drive. If you want you can add a Final Drive set while you are there if you are looking for a more aggressive setup.

BTW:
CTR Trans are also tagged S4C but will have a factory LSD and LSD stamped on the housing in black. If you see this when you look in the differential hole then it is more than likely a 99-00 Civic Si.

chi_gsr

Great, this has been throwing me for a little bit, From the picture you provided i remember (swap is in) i did not see that pin there, does this mean correct me if im wrong that i have a lsd ? is there a way to properly check it without opening up the trans ? and can you tell me as far as the final drive goes 4.4o vs the 4.78 when you mean more aggresive in what since do you mean by this ? im planning to boost my motor as a daily driver so trying to do as much research as i can and understand the differences between the others.

Gearspeed-Performance

iTrader: (1)

Just pull the axle and if you see a pin going across like the pic its a NON-LSD.

The higher the FD number means an increase in acceleration speed with a compromise of top speed. If you plan to boost on a daily...the 4.4 may be the highest you may want to go. 4.7 and 4.9 are more suitable for all motor and road racing. Just keep in mind that every set up will differ and final drives should be tailored to your setup.