BMWs new quad-turbocharged diesel

I think they're building on the theme of one turbo to feed a second turbo to cut down on turbo lag time? And then due to today's small engine compartments they probably have gone to two turbos on one side of the engine and two on the other side to cut down on the large turbo piping.

Bill

More components means more likelyhood of a failure. I wonder if the turbos are different in sizes and what ranges where they work. I could see a scenario where they are somewhat cascaded. I have seen combos of supercharger and turbocharger. The power of a supercharger starts immediately but the turbo takes over at higher RPM.

Bigger question: Where are they hiding?

Could easily get away with 2 turbos. One smaller for response and a larger on for power.

Trackrig wrote:
Yes, and imagine the cost to replace four turbos - the turbos and all of the labor........

Bill

I think this is where the old saying kicks in: If you have to ask the price, you can't afford it. :E

Yes, and imagine the cost to replace four turbos - the turbos and all of the labor........

Bill