JDM Gears

[Rob_Fenn]

I've read various thing regarding gearing, so was hoping for some confirmation if UK cars do or don't already have JDM gears?

Are the JDM gears SoS and Dali sell always Type R ones, and thus even shorter?

Cheers

Rob

[AR]

I think that 1996 3.0s had them but not much benefit as they had the extra weight.

For your 6 speed box, you will need the R final ratio and a twin plate conversion IIRC.

Cheers,

AR

[markc]

We confirmed, through empirical testing, that '96 3.0Ltr 5spd cars had JDM gears and that the final drive (differential) ratio was the standard 4.206:1 one
Don't assume based on the year of registration though it has to be year of manufacture!

The close ratio gear set of these cars may not make them faster but they will feel much more usable on the road with fewer occassions where you are left "between gears" and out of the VTEC zone.

3.2Ltr 6spd cars were all the same worldwide.
Only Type R's, both NA1 & NA2 had the lower final drive.

You can go for an even shorter than NSX-R final drive (4.235:1) with Gillken (4.44:1)or Comptech (4.55:1)

Mark

[goldnsx]

The short or JDM gears are available in Europe from 95 on.
The standard final drive was 4.06, not 4.206 (typo?).

IMO the 4.23 is a good combination if you go for short gears with a 91-94 car. It's not worth the labor/money if you do it as a single mod. The 4.44 is pricey and the 4.55 is not available anymore.

Simple testing if your car already has short gears. Rev-limit 1st and watch how low the rev in 2nd fall. In the case of long gears: 4.4k rpm, in the case of short gears: 5.1k rpm.

I have both on a 91 as our hills and mountain 'need' them.;)

[Rob_Fenn]

Thanks for the info guys :)

[Martin]

Hi Rob

I just had a look at your Project NSX website - your car looks awesome. You are doing a great job. I own a 1996 UK 3.0 with short gearing, 2nd maxes at 71mph which is quite a bit shorter than normal gearing, and 3rd at 102mph, so acceleration to 100ish is improved but I guess that means slower acceleration beyond 100?

Cheers
Martin

[Rob_Fenn]

Do you think it's worth it?

Thanks for the comments, must get that site finished!

[Martin]

I don't know how much the short gears cost (as mine was built new with short gearing), so I don't know if its worth it, because in my eyes every modification has a limit in its worth.

However, I would say that it must rate very higly as a modification. You are always in VTEC.

Also, some/all 1995 UK NSX 3.0s had short gearing, if that helps?

Cheers
Martin

[ctrlaltdelboy]

I got a new box with JDM gears and OSG LSD with 4.4 final drive when my Comptech 4.55 disintegrated and killed my original box.

it cost around $6k IIRC back in 2003 and is about the best performance mod I've done.

I think Kev has the same setup

[Rob_Fenn]

Do you know how it caused the box to be killed... and is there anything to say your new final drive is better (i.e won't destroy it!)?

Cheers,

Rob

[goldnsx]

The CT 4.55 were prone to fail. The 4.23 is the savest as it's JDM. Don't know about the 4.44. Guess it's save too as it's Japanese quality.

[ctrlaltdelboy]

most likely cause was the fact that I had one of those magnetic sump plugs designed to catch any swarf/shavings of metal which float by in the oil - it incorporated a short protruding 'pole' on the inside to do the catching, and this was found to have sheared off on inspection.

the ring gear was ok, but the pinion had big chunks missing from several splines.