There are four different types of turbocharger fitted to the Cosworth range of cars as standard equipment.

The most common model is the Garret T3, as this is used on both two-wheel drive, and four wheel drive cars.

The largest turbo used is the Garret T04 that was used on the homologation speial RS 500. The first generation Escort Cosworth used a turbo that was sized in-between the RS 500 and standart Cosworth units, and this is a Garret T035. Finally, the latest generation Escort Cosworth uses the smallest unit, a Garret T025.

The mounting of the turbo on to the engine is also done in different ways. On all two wheel drive cars, (including the RS 500), the exhaust manifold is a sweeping, two piece design, that places the turbocharger high up, and next to the top of the engine. This manifold design is very unrestrictive to exaust gases, but this does create a couple of drawbacks. Firstly, due to its length and semi-circular shape, resonation is created at certain engine speeds. To eliminate this, a turbo damper is fitted to te turbo and cylinderhead. Secondly, the internal lengh of the manifold creates a certain amont of turbo-lag.

The manifold used on the four-wheel drive cars is a more compact design. This eliminates the need for a turbo damper, and aids response. This manifold will not flow the same high quantity of exhaust gasses as the original type, but this will not cause a problem until power outputs above about 430 BHP are required.

To suit the different exhaust manifolds used, the mountings of the turbo’s are also changed. The two wheel drive units have studs threaded into them, and nuts on the manifold. On four wheel drive cars, the studs are threaded into the manifold and the turbo has clearance holes in it.