The T35 (Escort Cos) and T3 (Saff 4x4) turbos are very similar to each other, both use the same centre section, and turbine wheel/shaft. The differences are the Sierra uses a smaller compressor wheel and housing, and a .48 exhaust housing where the Escort has the bigger compressor and uses a .63 turbine housing. The Sierra turbo starts making good boost at about 2700rpm, the Escort (T35) needs about 3500 to really start puffing. I personally wouldn't use the bigger turbo unless you are ALREADY making 350hp, the bigger unit will make the car feel slower on anything other than a reasonably tuned engine. I would say my old 4x4 Saff on 15 pounds boost was at least as quick in acceleration as my Escort on 20pounds, if not faster. As an option, if you have a good Sierra Turbo that has already had a 360 thrust fitted, you can retro-fit a t35 compressor wheel and housing, and a .63 exhaust housing. I have a new .63 exhaust housing which I am happy to sell, and I might have a compressor as well, will have to check though.cheers conrad

Just reading what you have done to your car, as the engine is still basically standard, and runnng 18 pounds you are probably making about 280hp. All other things being equal,going to a T34 at this stage will make the car FEEL slower, it will feel nowhere as responsive as the T3. You will make a bit more power at the top end, but lose it everywhere else. I would hold off the bigger turbo until you have done some mods to the engine, get the one you have rebuilt with a 360 thrust bearing and it will do the job nicely.