Differential Ratios

[sambo]

Either way, 4.1 and 4.3 are both less than ideal. You can import a new KAZ centre in your ratio of choice from Japan at great cost (around $1000) or fit the S15 helical centre and matching half shafts. I used to own an S15 and they hook up very nicely once fitted with a camber kit.

I spoke to Warwick last week and regarding diff ratios he told me to speak to the guys who fitted the 3.5 (or whatever) into Stiffy's Daytona... turns out he lucked upon that second hand.

Might be worth calling japanautos.com.au (with that eBay listing) to see if they have anything else. They're in Brisbane which is handy for you Merv.

Edit: the final drive ratio of the S15 diff is 3.692. http://nissans15.com/spec.htm

[07cob]

Originally Posted by sambo

Either way, 4.1 and 4.3 are both less than ideal.

Paul

I also have considered the change of centre and I am interested in the pros and cons. Why do you think the 4.1 and 4.3 are not ideal?

I am running a stock Mustang 302 and T5 with 0.68 top ratio. The R32 rear has a 4.3 ratio - I did an approximate check some while ago. The engine runs out of puff around 5500 rpm (either that or I do).

What would be the benefit in running the 4.1 or even 3.7 rear gears? I can see that economy might be better but that really is not the purpose!! I suppose dropping the rpm at 110km/h down from 2800(ish) might be good for long term reliability. I can imagine that I wouldn't be changing gears as often but would there be any overall performance benefit?

If I add some grunt to the power plant, I can almost see that the change in the diff might be useful, but with the stock 302, I am not so sure.

Cheers

Geof