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KAAZ Racing Differential 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

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KAAZ Racing LSD Oil

Price: $44.25
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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

 

 

Final Drive Ring and Pinion - FC Non-Turbo

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4.30 Final Drive Ring and Pinion - FC T2

Price: $744.00
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RP Alternator Dual Belt PulleyEngine 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
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