Originally Posted by
TIM TIM TIM
sequential is like supras and stuff where one is bigger then the other. one for low rpm and one for high.. "left bank and right bank" would be for a V engine where one side off one turbo and the other side off the other turbo. I dont think I have seen any twin turbo kits on a 4 banger, im sure someone has done its for sure not common.
Actually, although the MkIV has a sequential setup, both turbos are the same CT-12b. Someone forgot to tell Toyota they were supposed to be different sizes!
Originally Posted by
TIM TIM TIM
I dont think I have seen any twin turbo kits on a 4 banger, im sure someone has done its for sure not common.
Actually next year BMW is coming out with a 123d (not in America though)..its a 1 series with a 2.0L diesel engine and a compound turbo setup...and 200 HP! In a 2.0 diesel!
However diesels run far more boost than gasoline counterparts, therefore making the compound setup for the 123d completely functional. BMW has also had excellent experience with the new 3.0 TTD in the 335d and 535d, which is also a compound setup.
Personally, despite how much I insisted when I was younger, I will always prefer a single to twins in an aftermarket setup. A nice twin scroll setup is far easier to package and manage than twins that are of equal size, half of what the one would be.
Bigger turbos tend to have more efficient compressors, plus you dont have two giant heat sinks next to each other, affecting intake temps as well as oil and coolant temps and routing.