Compression Ignition Addict
Join Date: Oct 2010
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Idling doesn't do much to really warm up the engine. Your oil and coolant will really warm up quicker if you just start driving. The added boost from the turbo pushed the combustion temps up and result in the engine block, oil and coolant coming to temps faster.
I've watched my gauges and done several test.
I can start the truck, let it idle for 1 minute to get the oil circulating and then drive through my residential area at 25 mpg and be MUCH warmer than if I left the truck to idle for 15 minutes.
These engine produce EGTs of around 300° at idle. Just an easy drive to exit the neighborhood produces 450-500° of EGT. By time I reach the freeway on ramp, my coolant temps is already up to 150-160° vs 10 minutes of idling and my temps are only 80°.
The Rapid Heat option produces supplemental heat to the cab when the coolant temps are below 100°. Once your coolant reaches 100° the supplemental heat turns off and the heater core just uses the coolant to supply the heat. The Rapid Heat is a 1500 watt heater coil in the heater assembly. It doesn't produce a lot of heat, but will get the windshield defrosted.
I've even done the Fast idle. Setting the idle up to 1100 rpm for 10 minutes still does not get the engine oil or coolant as warm as 5 minutes of normal driving.
Start your engine, give it a minute to get the oil circulating and then just drive in a normal manner. This will warm your engine up faster and is better for the engine than extended idling.
2015 F350 CC SRW LWB Lariat, Leveled, BAKflip, Ultra Predator wheels with Toyo A/T 295/65R20, Firestone Airbags and onboard compressor
2011 F350 CC SRW LWB Lariat - Gone
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