General recently introduced a new 8 speed automatic transmission - Hydra-Matic8L90, and the gearbox is equipped with Stingray. It is reported that this gearbox despite an increase of 2 block, but the volume and the 6AT to maintain the same function has been enhanced.
GM's new 8AT will be the first equipped in Stingray
The new 8AT is made up of 4 planetary gear sets, 2 brake clutches and 3 rotating clutches, but the scale is still in line with 6AT, and the weight is lighter than the 6AT. At the same time, 8AT received a higher torque than 6AT 11%.
General 6AT/8AT/ZF8AT gear ratio comparison
Transmission 2 3 4 5 1 block 6 block block 7 block 8 block block
6AT 2.36 1.15 0.85 0.67 1.53 3.06
8AT 2.97 2.08 1.69 0.85 0.65 3.82
ZF8AT 3.13 2.10 1.67 0.84 0.67 3.3
It can be seen from the gear ratio of each gear, the universal 8AT1 gear ratio is expanded from 4.03 to 4.56, starting to get more torque. Transmission overall tooth size is also more extensive, with the ZF8AT transmission is not much difference.
It is reported to have been equipped with Stingray0~96.5km/h 8AT (0-60mph) to accelerate the speed of 0.1 seconds. Fuel efficiency increased by 3.5% in high speed mode. |
