BMW will launch in 2011 at the Frankfurt Motor Show, the new tri-turbo diesel engine, capable to develop 354 horsepower and 700 Nm, engine which is expected to equip X5 and X6 models. BMW is currently developing a new diesel engine, which is preparing to break existing patterns in terms of power and consumption. Bavarians want for some time, a tri-turbo unit capable to compete with V8 engines of the other German manufacturers.It seems that the development process goes well and the premium manufacturer plans to launch the tri-turbo diesel in the autumn of next year at the Motor Show in Frankfurt. Currently we know about the new engine that would be a unit with 3.0 liter and six-cylinder.Such a version three turbochargers would develop a total of 354 horsepower and an impressive torque: over 700 Nm. With this baggage of power, BMW will be able to withstand some V8 engines from Audi and Mercedes. Tri-turbo engine will be mated to an automatic gearbox with eight reports, developed by BMW together with specialists from ZF, currently found in Bavarians range on the new 5-Series GT.There will be also the Efficient Dynamics technology, regenerative force brake and start-stop. First models to get under the hood the new six-cylinder unit will be BMW X5 and X6, following versions will be named “xDrive 45d”.
Reliability ... especially when warranty ends. More turbos means more potential for either one or two of the turbo's to fail.
Only time will tell about the reliability of the tri-turbo engine.
Fyi Audi 4.2Tdi manages 326hp/650NM using twin turbo's.
Is it 3 small turbos each feeding 2 cylinders or triplet scroll turbo, i.e. small, medium and big size turbo cater for low, medium and high engine speed?... interesting.