wilber1 wrote:
Perrysburg Dodgeboy wrote:
Not sure why the single battery and no option to add duel batteries. Maybe the 3.0 cranks over easier then the Cummins .
My guess is you won't find dual batteries in any of the German 3.0 diesels either.
Due to Common Rail diesel motors in Europe running at 1600 to 2000 bar fuel pressure from the Bosch or Delphi HPFP, the fuel is atomized much better by 7 hole nozzles on the injectors, thereby allowing the engine to be built around a 16:1 to 16.5:1 compression ratio, and still start easily in cold weather. The lower compression ratio allows a single battery to start the motor. It also allows the turbo to run higher boost pressures without pulling the studs out of the head due to too much strain. This motor probably runs about 1.5 -1.6 bars Boost pressure, possibly full boost at anywhere from 1500 to 1750 rpms, unless they went with a larger turbo where a VNT turbo's boost is all in by 2000 rpm's for peak torque. But my guess is on around 1750 rpm. The torque curve and the lowest rpms where it peaks is probably where the turbo boost is all full in at 1.5 bars, allowing maximum fueling ratio without clogging the DPF filter prematurely. Bosch modifies their fueling maps all over the place on Common Rail diesels, depending upon the requests of the engine manufacturer, particulate and NOx requirements, and car manufactureres acceleration requirements. Making the torque is not so much a problem as is mapping a tune that will not destroy the exhaust cleansing system by overloading with soot and Nox readings while under warranty.
Respectfully submitted,
The Armchair Clown.
