does anyone have experience with this trans. is the gearing shorter then the si.

 

I believe it is a little bit longer gearing than the si. I think it is said the best combo is a si trans with zc final drive...or maybe it is the other way around. but either way, the si trans is legit...nice tranny!

 

I have the zc transmission and the gears are shorter. I have the Si final drive and still pretty much hit 5k RPMs at 85 MPH!!!! That is with the stock 14 tires. Great for acceleration, horrible for high speed cruising.

Chris

 

I have an Si tranny........OK for acceleration, and better then the ZC at highway speeds. I think at 80 mph, it's 3.5K RPMS....on stockies.

 

I always thought that the si trans had shorter gearing...noted here: http://www.rglobal.net/user/jgray/Engines.htm

and on another 4th gen site, it shows the gear ratios.

 

Nope, here are the gear ratios.

GEARING:
JDM L3
Gear Ratios
1st 3.250
2nd 1.944
3rd 1.346
4th 1.033
5th 0.878
Final 3.888

USDM L3
Gear Ratios
1st 3.250
2nd 1.894
3rd 1.259
4th 0.937
5th 0.771
Final 4.250


As you can see the gears on the ZC L3 are shorter than those of the US L3. Second gear on the ZC will turn 1.944 times for every one rotation of the engine versus only 1.894 turns for the US L3.

For the final drive, the axles on the ZC will turn once for every 3.888 turns of the input shaft to the final drive versus once for every 4.250 turns on the USDM L3. This means that at the same engine RPM, the tires on the USDM L3 will be spinning more slowly than the tires off of a ZC L3....


Chris

 

I see them for sale for 150 plus shipping I was gonna get one but I spend most of my time on the highway and its noisy now at 80. How much quicker does the zc tranny feel.

 

when you install the SI final drive , there great for the track or autocross......