yeah, all of them (almost all diesel engines bigger than 1.6 liter I guess) are using filters of various kinds, but all of those filters are just friction losses, so a fall in the pressure level. since the turbine works with the pressure available at the exhaust, the filter is going to be just a problem from this point of view. the best situation for the filter is when it is almost glogged with particulate, so the action of filtering the gas is maximum, but also the flow of the gas is highly hampered, and so the friction loss is even worst. and that's going to affect the turbine's efficiency.Originally Posted by henk4
a lot of engines received smaller bumps in power/torque since they were equipped with filters than what they received when not using the filters. my first thought is the old 2.5 liter V6 TDi from Audi, which received a bump of 30 hp shortly after its debut. while now the first way to gain so much power is a second turbine or a larger displacement. but that's also due to the fact that a lot more new technologies were applied some years ago than now, and that's another of my point "against" () the diesel engine, its evolution is really slowing down (unlike that of petrol ones), and it's becoming even more expensive than what it already was.
don't get me wrong, I enjoy riding diesel cars, the torque available is addictive, the low mileage is great. but the sound sucks, and so the vibrations transmitted to the car itself too
besides, I drove a BMW X3 with the 2.0 liter petrol engine and equipped with a methane system, and the car was vibrating transversally every time I was pushing the throttle while standing.
up to some years ago, and perhaps even now, diesel engines are quite a good option, they offer a lot and perhaps the pros are more than the cons.
my argument is that this is not to last, and it's already changing.
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