Quote:
Originally Posted by Daox
Is there really measurable gain there?
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Yes, the gain is measureable (from both sources). I don't know as I've ever done it myself in a vehicle, but I've seen in many times on engines on dyno test stands.
Quote:
Originally Posted by Daox
Deisel engines optimize both of those thing better than most other engines already.
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Diesels typically aren't as optimized for reduced pumping losses (high VE) as you might think. In typical spark-ignited naturally aspirated gassers, high VE is pretty much the only way to get more torque at any given speed. So if you want to get more torque you pretty much have to increase the VE. On a diesel however, you can just add a little more fuel and/or a little more boost and you'll get the torque. Sure the FE will be sub-optimal, but it's just so much easier than redesigning heads and intakes.