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MAY-06
An issue that had needed attention for some time was the gearing. I noticed
the loss of acceleration straight after the 19" wheels where fitted & had
always wanted to regain it back. When an (RX-7) FD 4.1 ratio came along, I
removed my diff centre & took it to have the crown wheel
& pinion changed over. "No go" was the reply as the FD gears are quite
different to the JC version. So a 2nd JC diff centre was sourced,
from a 13B version that comes standard with a 4.3 ratio. Then, what has
become so typical of Mazda, even the 13B gears where different...Grrr.
Several hundred dollars worth of engineering later & the 4.3 ratio was
installed. Had this been a Supra-to-Soarer or Silvia-to-Skyline change,
everything would have bolted directly into place. When will they learn.?
With the 4.3 installed, the car was instantly revived regaining what was
previously lost to the 19" wheels & then some more on-top. Accelleration is
so much better, throttle response is better but long distance cruising is
thirstier as 4th gear revs are now 300rpm higher for the same speed as before.
In short, this is an excellent performance gain that was worth the cost.
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