Yes its for the S2K lump. The original diff ratio is 4.1:1 but I want better acceleration and lower top end. Car's mainly going to be used for
track and hill climbs so I was going to go with 4.44:1 but then I read this...
In the quest for improved performance and drivability, most S2000 enthusiasts would agree that new rear gear set with a higher ratio over stock
provides one of the greatest performance values available for the S2000.
Through an exclusive arrangement with Richmond Gear, the leading US manufacturer of professional quality, high performance ring and pinion gear sets,
we are pleased to announce that we now have in production a never-before available rear gear set for the S2000: a 4.57 ratio. Rick's new
Richmond 4.57 gear sets are a far superior product to the 4.3, 4.44, and 4.77 gear sets previously available. They are stronger, better made, and are
delivered with special treatments for hardness and improved lubrication (the latter uses a process developed by NASA for the treatment of critical
engine parts in the Space Shuttle). But the price will remain the same: $590.
Richmond Gear is the leading US manufacturer of professional quality, high performance ring and pinion sets, and its gears are the highest quality in
the racing industry The superior quality of Richmond gears is the result of continual research and development, outstanding design, and
state-of-the-art manufacturing. For example, the teeth of Rick's 4.57 gear sets are 20 percent stronger than those in the stock Honda gear set
or the 4.3 and 4.77 gear sets, which are made by Mazda.
On the advice of Richmond engineers, who have unmatched experience in ring and pinion gear design, we concluded that the 4.57 gear ratio would be
ideal for the S2000, falling in the “sweet spot” between the 4.44 and 4.77 ratios made by Mazda (which makes the stock 4.1 rear gears and diff), and
ideal for both improved acceleration and highway cruising. Since the 4.44 and 4.77 ratios are relatively old designs made originally by Mazda for use
in other cars, both involve trade-offs on the S2000. While it provides brisk acceleration and performance, the 4.77 compromises highway cruising,
forcing drivers to run much higher RPM at cruising speeds in 5 th and 6 th gear. The 4.44, although better for highway operation, lacked the
performance kick of the 4.77. The 4.57 provides the best of both worlds.
All the gear sets previously available, since they were made my Mazda for cars with far less power than the S2000, were subject to breakage and damage
when used in S2000s with forced induction, or by drivers who routinely use clutch drops for quick starts or drive very aggressively.
Until about six months ago, the 4.44, and 4.77 rear gear sets for the S2000 were routinely priced close to $1,000 and occasionally fell just under
$900 in group buys. Through special arrangements with suppliers around the world, Rick's was able to reduce the price to only $590 + shipping.
The new Richmond 4.57 rear gear set, which offer much improved quality and strength, represents an exceptional value at the same $590 price.
With the debut of the Rick's 4.57 Richmond gear set, we will no longer carry the 4.44 ratio, a moot point perhaps, since the world supply is
nearly exhausted. However, the 4.77 ratio is still being manufactured and will remain in our inventory for performance enthusiasts who want its extra
kick and are willing to give up some comfort on the highway.
http://www.ricks2k.com/products/reargears.php
I am going to try getting in touch with Richmond to see if they can supply as CWP to fir the Cossie diff.
[Edited on 2/11/04 by atomic]
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