For those that prefer rebuildable, mechanical differentials,
we offer the extremely high quality and durable KAAZ Racing
Limited Slip Differentials. KAAZ is the leading manufacture
of differentials in Japan building them for Japanese manufacture
work teams such as Mazdaspeed, TRD, Nismo, STi, etc. This
is the same differential we’ve been using on our
own race cars and we’re happy to report NO failures
in countless runs. If you’re looking for something
to handle the abuse you give it on the drag strip, road
course or the street, this is the one we choose.
KAAZ Racing LSD Oil
Price: $44.25
Adjusting
the final drive gear ratio on your RX-7 will alter the
acceleration and top speed. You can think of it almost
like a 10 speed bicycle where the lower gears let you
accelerate quickly but limit top speed whereas the higher
gears are hard to get started (poor acceleration) but
net a high top speed. For manual transmission cars, the
stock final drive gear ratio is 4.10 (3.90 for automatic).
Going to a different gear such as the 4.30 will result
in faster acceleration and a lower E.T. For the non-turbos,
the 4.30 final drive gear comes from the rare GTUs models.
For the Turbo II, the 4.30 final drive gears are sourced
from the Japanese-only Infini version.
The table below is meant to be a reference between the different gear sets. It
is fairly accurate considering stock rear tire circumference but it is not a
guarantee that your results will be EXACTLY the same.
Turbo
II
(Note: 1987-1990 Style
gearing used in table) |
| Final
Drive |
RPM
5th gear @
60mph |
Speed
(mph)
7500rpm
1st gear |
Speed(mph)
7500rpm
2nd gear |
Speed(mph)
7500rpm
3rd gear |
Speed(mph)
7500rpm
4th gear |
Speed(mph)
7500rpm
5th gear |
| 4.10 |
2600 |
35 |
61 |
88 |
122 |
160 |
| 4.30 |
2800 |
33 |
58 |
83 |
117 |
152 |
Non-Turbo
(Note: Standard transmission
gearing used, not GTUs) |
| Final
Drive |
RPM
5th gear @
60mph |
Speed
(mph)
7500rpm
1st gear |
Speed(mph)
7500rpm
2nd gear |
Speed(mph)
7500rpm
3rd gear |
Speed(mph)
7500rpm
4th gear |
Speed(mph)
7500rpm
5th gear |
| 3.90 |
2350 |
38 |
66 |
97 |
133 |
191 |
| 4.10 |
2500 |
36 |
63 |
93 |
126 |
181 |
| 4.30 |
2675 |
35 |
60 |
88 |
121 |
173 |
4.30 Final Drive Ring and Pinion - FC T2
Price: $744.00
Engine
mounts are a common failure on 2nd gen RX-7s. Replace
yours with a pair of Mazda factory performance mounts.
These mounts were designed for the limited production
MazdaSpeed cars of Japan and are available now in the
US. These mounts are about twice the rigidity of the
originals, but are still noise-free. Installation is
a direct bolt in with no modifications. Sold individually.
Mazda
Hardened Motor Mount
Price: $91.52 each
