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Old Today, 11:09 AM   #26
WRXnick16
Scooby Newbie
 
Member#: 447898
Join Date: May 2016
Chapter/Region: BAIC
Location: W Sac, CA
Vehicle:
2016 WRX (traded)
2019 STI CWP

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Letting an engine warm up != idle.

Obviously you should get your oil and coolant up to normal operating temperatures before abusing the engine.. your engine will thank you.

Idle vs light throttle cruising/decel probably makes little difference in the grand scheme of things. You would need to monitor the AFRs for your tune during each to see which may be better for your engine. There are a lot of variables to consider. For example, are we talking about an EJ or FA?

The FA has things like stratified warm-up to help heat the catalytic converter up faster for emissions purposes. This results in a higher idle speed, retarded timing and excessive fueling (higher AFR & total fuel mass) during the intake and compression strokes. Stratified fuel mode uses 50-100% more fuel at idle than homogeneous fuel mode. The engine itself can even take longer to warm up as a result of more heat being lost to the exhaust as the exhaust valves are opening sooner to aid in heating the catalytic converter. The engine is less efficient during stratified mode because of the retarded spark which results in a larger volume of airflow being drawn into the engine to compensate for the reduced engine torque and maintain idle speed. This results in more fuel being delivered. Yes, tunes are compromised for emissions

If you live in a cold enough climate and are truly concerned then I recommend investing in an engine block heater.

.. letting your engine warm up also doesn't mean that you can go and immediately abuse your car either. You still need to let heat cycle through your transmission & diff oil, tires, brakes, etc. It's just one piece of the equation.
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Last edited by WRXnick16; Today at 11:23 AM.
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Old Today, 01:23 PM   #27
pizza_pablo
Scooby Specialist
 
Member#: 367980
Join Date: Sep 2013
Location: Pacific Northwest
Vehicle:
2017 WRX / HUQ-22
Lapis Blue Pearl

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Of course. My old ass don't wanna get in no cold car.
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Old Today, 02:10 PM   #28
WRXnick16
Scooby Newbie
 
Member#: 447898
Join Date: May 2016
Chapter/Region: BAIC
Location: W Sac, CA
Vehicle:
2016 WRX (traded)
2019 STI CWP

Default

We could all just buy electric cars. (sarcasm)

Problem solved
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