Well I have heard alot about this and have been told it makes a big difference and the car pick's up faster.

So what does it altemetly do?
Is it worth it?

 

Higher final drive will increase your acceleration but will hurt top speed in return. At least, that's what I was informed.

 

{raises hand}

 

True.

 

ME!

 

whats the stock usdm final drive?

 

4.4

 

Ok so for those who run the JDM final drive how mutch of a difference does it make? And how mutch of a difference in the top end does it hurt?

 

so with that logic, the ATS 4.929 final drive has even more pickup than the jdm final drive but has even less top speed?

 

you got it.

IM RagingAngel and he will tell you how much he likes his JDM FD.

 

I have the ATS FD and lost only 1mph due to dropping in a GS-R 5th gear too

If you type in ATS in the search engine, you should find a LOT of info on it including my topic and BlackR's topic about our impressions of the ATS 4.929 FD.

It's the best money I ever spent on my car

 

yeah im not to worried about top speed anyway, after i get my jdm front installed my next upgrade is gonna be a set of 16's and new tires, then an ATS 4.929 and a lightweight flywheel

 

How much did you guys get your JDM ITR FD's?

 

Talk to Mike at IPS Racing on this board (TypeRMsm). He is a great guy. I think he has 2 of them if i am not mistaken ready to go at the moment if they are not already sold. Best money i ever spent.

mike

 

We get 4.78 final drive in Australia as well as red recaros

 

JDM = max. speed possible: 241 km/h (149,70mph)
USDM = max speed possible: 257-265km/h (160-165 mph)

Well,
but the R isn`t made with topspeed in mind....
The JDM will have the better bite from 4th to 5th.

I`m happy with JDM

 

Maijk190 - did you take the USDM 5th gear into account. USDM 4th and 5th gear is shorter.

 

JDM FD + GSR 5th = GHEY!

D

 

Okay, our EURO specs:

ratio 4,785

1st 3,230
2nd 2,105
3rd 1,458
4th 1,034
5th 0,787

That`s JDM isn`t it ?

What`s USDM ?

 

USDM ITR specs.

1 = 3.230:1
2 = 2.105:1
3 = 1.458:1
4 = 1.107:1
5 = 0.848:1
FD = 4.400:1

Will

 

So, USDM 5th gear reduction = 4.4 * .848 = 3.731
JDM 5th gear reduction = 4.785 * .787 = 3.7658
Just a small difference.... regarding top speed.

 

Yep and that makes the USDM run better topspeed and hurts it`s acceleration or am I thinking wrong ?

 

Small difference in top speed.

With the 4.785 F.D. on a USDM tranny = JOY

Will
-who is saving money now

 

Yeah but making enough torque to fight the air drag.....

A stock JDM R I think would not take advantage of an USDM tranny

 

I'll just give you and some others a nice tool to play with,

It's set on the USDM ITR but, you can change every gear and the FD and even the tire/wheel diameter to figure out what it all will come out to in the end: http://www.autocrossing.com/cgi-bin/gearcalc.cgi

My summary, I chose the ATS 4.929 and Toda FW. That matched with my stock rims and 205/50/15 tires and I'll have a top speed of 139 MPH at a redline of 8400 RPM. Install is next month, I'll be sure to post results.

There are a couple of different camps here on HT that are pro FD. While they are in agreement over the FD, there is a little discrepency about either choosing the JDM or the ATS. Ultimately the choice is yours...

A.