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I've seen it mentioned on an OZ track car - but just one extra plate.

Given the normal GT-R's propensity for busting front diffs and axles on the drag strip it's not a very common mod.

A few people on here talk of Jun uprated high torque centre diffs but I haven't seen any more details on the actual mod.

The Group A cars used an uprated unit with different internals - have a pic in a book somewhere - will try and dig it out.
 

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Discussion Starter · #3 ·
I've seen it mentioned on an OZ track car - but just one extra plate.

Given the normal GT-R's propensity for busting front diffs and axles on the drag strip it's not a very common mod.

A few people on here talk of Jun uprated high torque centre diffs but I haven't seen any more details on the actual mod.

The Group A cars used an uprated unit with different internals - have a pic in a book somewhere - will try and dig it out.
please dig out the picture:) I should not have front diff issues, the gearbox is fitted in an escort cosworth with a big f diff
 

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Yes - it's just clutch packs - but in effect it is the centre differential.
Slippage in the clutch packs gives the differential drive front to rear.

I found the book - weirdly the Group A car had only 5 plates instead of 7.
Only other mod is some part of the shaft is 32mm instead of 30mm.

I will scan it soon and post the pic up - we'll need someone who can translate japanese to understand the full details. (Anyone got any Kanji OCR software that will run on a Canoscan?)
 

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tyndago - GT-R ATTESA information

Some pictures in there of an R32/R33 transfercase vs an R34. It should be noted the R32/R33 transfer case looks much beefier than the R34.

7 drive plates, but 12 driven plates in the transfercase.

Put more pressure on it, it will lock up harder. Run gear oil in the transfercase instead of ATF, it will lock up harder. Not either thing I would recommend for GT-R's under most situations.
 

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Here is the scan from the book.

Any japanese language scholars translate the section starting [2] 3/4 down the left hand page?

If you look at the sectional drawing it labels the plates 7 -> 5 and shows the shaft increased to 32mm from 30mm.

Maybe they ran higher lock pressures?


 

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It's a small paperback all about the Group A R32's. Tonnes of technical details but sadly all in Japanese. You can still work a lot out from all the pictures and graphs. The engineers did a lot of work analysing how to improve on the R31 and the Sierra Cosworth - very interesting little book.

The cover has an overhead view of the Reebok Hasemi car in the pits.
 
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