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Message: [QUOTE="backwoodsboy, post: 527625, member: 5415"] You're right that diesels are efficient off idle compared to a gas engine. However there is still enough wasted energy in the form of heat to bring oil and coolant up to near operating temps in a short period of time. I can take a 10 min video of my EOT and ECT gauges if you don't believe the temps will increase. Using your own logic (diesels being efficient at idle), why wouldn't you let your truck warm up? Run out and start it 10min before you need, head back inside, take a sh!t, head to work. Running a diesel cold is extremely inefficient. Not only do you have insufficient cylinder temps for proper combustion, but our trucks you have thick oil firing injectors. I'd be willing to bet if you compared fuel consumption from a 10min idle period + a certain distance with that same distance starting cold they would be fairly close. To answer your question, I'd say a combination of closed EBPV, advanced timing, and HPOP struggling to build adequate pressure with thick oil all contributed to it bogging down at 1800rpm. My general rule of thumb is to keep rpm below 1500 and boost below 5 psi until EOT and ECT are within operating range. This will ensure warm oil has reached the turbo for proper lubrication. [/QUOTE]

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