Coppia Conica: quale e come

[Mr.Wolf]

http://www.solomiata.com/Drivetrain.html

"The 1990-93 1.6 liter Miata used a rear that was derived from the rear of the 88 323GTX AWD and dates back to the 1978 RWD GLC. It had a 6" ring gear and is not very strong. In 1994 Mazda used a larger and beefier rear unit for the 1.8 Miata that has a 7" ring gear and is derived from the 1986-1991 NA RX-7 rear with the exception of the shorter pinion and front pinion housing..."

http://www.miata.net/garage/vlsd.html

"The only replacement unit for the early diff that has been used extensively is the competition clutch style LSD available from Mazda Competition or MazdaSpeed. (Cusco and Kaaz also make a replacement clutch style unit but I have heard little about them). UPDATE 8/6/98: I was recently informed that OPM in Cummings GA will convert an open diff to a clutch type LSD for about $600. I have no information on these except that this is the unit some ITA racers are using.

A Torsen type LSD is an upgrade for the early unit but requires replacing the entire diff housings assembly from the later 1994-> generation cars as they are completely different units. See Dennis Nutting's Torsen upgrade page for more on their installation reports. See also the Miata.Net Garage for other swap info..."