Texx
Super Moderator
Original Article Credit: Monkfish
CT9a = EP82 GT Turbo
CT9b = EP91 Glanza V
They are both standard Toyota turbo's. The CT9a was fitted to all models of the GT Turbo. The CT9b has 9 blades on the exhaust impellor rather than 8 of the 'a'. It produces a little more low down torque at the sacrifice of a little top end bhp. It was fitted to the Glanza to compensate for its fatter arse (GT = 860kg's, Glanza = 920kgs).
And they produce a slight different exhaust note too.
Photo of the exhaust side of a CT9b (left) and CT9a (right)...
Can either turbo be fitted to either car? Yes, although drivers of standard Glanza's might notice a loss in low down responsiveness due to the slight drop in torque.
The stock CT9 turbo on the GT Turbo and Glanza can be ran at 1.0 bar (14.5psi) all day long and, with the correct supporting mods (covered elsewhere in this thread), will see 170-180bhp at the flywheel. Much more than 1 bar and the little CT9 starts to struggle and runs out of puff. An increase from 0.8 bar to 1.0 bar might see you gain 20 or so bhp, but an increase from 1.0 bar to 1.2 will not see a similar gain. This is because the CT9 is being run well beyond it's efficiency envelope and starts to just blow hotter and hotter air, which is not good. If you want more power, it's time to start looking at a larger turbo. TD04L from an Impreza seems to be the most popular upgrade alongside a hybrid CT9.
CT9a = EP82 GT Turbo
CT9b = EP91 Glanza V
They are both standard Toyota turbo's. The CT9a was fitted to all models of the GT Turbo. The CT9b has 9 blades on the exhaust impellor rather than 8 of the 'a'. It produces a little more low down torque at the sacrifice of a little top end bhp. It was fitted to the Glanza to compensate for its fatter arse (GT = 860kg's, Glanza = 920kgs).
And they produce a slight different exhaust note too.
Photo of the exhaust side of a CT9b (left) and CT9a (right)...
Can either turbo be fitted to either car? Yes, although drivers of standard Glanza's might notice a loss in low down responsiveness due to the slight drop in torque.
The stock CT9 turbo on the GT Turbo and Glanza can be ran at 1.0 bar (14.5psi) all day long and, with the correct supporting mods (covered elsewhere in this thread), will see 170-180bhp at the flywheel. Much more than 1 bar and the little CT9 starts to struggle and runs out of puff. An increase from 0.8 bar to 1.0 bar might see you gain 20 or so bhp, but an increase from 1.0 bar to 1.2 will not see a similar gain. This is because the CT9 is being run well beyond it's efficiency envelope and starts to just blow hotter and hotter air, which is not good. If you want more power, it's time to start looking at a larger turbo. TD04L from an Impreza seems to be the most popular upgrade alongside a hybrid CT9.