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With the proper size tire and gear combo (35" & 3.73:1) I am hoping to be at 30 MPG. Stock engine torque numbers are 212 @ 2000. I will be higher than that with my exhaust mods and the intercooler I have planned. ( probably closer to 260). The current generation 1KD-ftv will do more like 300 ft/lbs. and get closer to 35 MPG. I wouldn't pay any attention to anything Jeremy Clarkson says about diesel. He hates diesel cars.
According to the article, they have gone away from traditional thermodynamic theory by optimizing other aspects of the engine. It is true that a lower pressure change will result in reduced thermal efficiency of a diesel cycle, but it looks to me that they are instead manipulating other factors to better accommodate our non-ideal environment.For instance, they have reduced the temperature of the exhaust which helps maintain lower cylinder temperature which combats detonation so that a more aggressive timing curve may be used to get better efficiency without damaging the engine.Keep in mind to not be fooled here too. Lower CR does away with beefed-up & heavy pistons/rods/crankshaft/cylinder walls. So they are also indirectly increasing efficiency by eliminating parasitic loses associated with high CRs.I suppose one could run a very low CR and simply add in a ton of boost, so long as the engine would fire when cold and have a smooth idle (of course these are limiting factors so we don't see this) ....But perhaps a 10:1 CR with 40 psi boost could be designed to have the same cylinder pressure and temperature change as a 20:1 CR at 10 psi boost.... My point being that we shouldn't simply take reading "lower CR" at face value. Sure there are many factors at play but its so cool to me to see engineers toying with other alternatives!Now they just need to properly market it for all the soccer moms picking up cat food from the grocers at 3pm every afternoon and we'd be set!BigMike
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