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At this point I'm inclined to believe Subaru that they reduced the internal friction on this new motor. When I had my Legacy with the EJ it warmed up fairly quickly. When I switched to synthetic it took longer to warm up. Well at 32 degrees out this morning my heated seat was warm long before the car was really blowing warm air. So to counteract I need to let the car sit there and warm up longer (more fuel) in the winter. Its the first time I've actually considered getting the remote start so I can fire it up from inside the house.
 

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At this point I'm inclined to believe Subaru that they reduced the internal friction on this new motor. When I had my Legacy with the EJ it warmed up fairly quickly. When I switched to synthetic it took longer to warm up. Well at 32 degrees out this morning my heated seat was warm long before the car was really blowing warm air. So to counteract I need to let the car sit there and warm up longer (more fuel) in the winter. Its the first time I've actually considered getting the remote start so I can fire it up from inside the house.
I recall something like 15% reduction in friction total with the change of many different aspects etc. Also synthetic vs standard oil plays a big role. Even my old 93 when switched to Synthetic took nearly twice as long to get up to temp and also put out good heat on cold days. Very easy to notice when prior to switching to synthetic I had full hot air by the end of the housing development in the morning switch to synthetic and **** if the thing didn't start putting out half way warm air by the 2nd stop light out on the main drag.

The new FB engine is probably way different in that regard design + synthetic oil.
 

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It does take quite a while for the blue light to go off. I was told that you dont have to wait foor the light to go off though in order to go, just proceed down the road without gunning it too much. It does take a really long time. We noticed that in our 2013 OB
 

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I’d be more inclined to attribute it to the function/algorithm of the emissions and cooling systems, as it is the coolant temp that warms the cabin and not the engine per se. It doesn’t take much for an internal combustion/explosion to warm a block.
 

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Discussion Starter #7
I’d be more inclined to attribute it to the function/algorithm of the emissions and cooling systems, as it is the coolant temp that warms the cabin and not the engine per se. It doesn’t take much for an internal combustion/explosion to warm a block.
Yes and no. The thermostat will stay closed until the block (coolant included) is at operating temperature. By turning the heater on it pulls heat from the coolant thats in the block as soon as it can prior to the thermostat opening. In theory if I started the car and turned the air off until I left everthing would heat up faster. It takes quite some time before the radiator and fans gets involved on these cold mornings.

It is also possible that the car is tuned to run really lean which would heat up the exhaust gasses as quickly as possible and thus warming the cat up sooner as well.
 

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Why let it warm up? Put it in gear and drive gently until the temp comes up.
With CA gas at $4.65/gallon I'm not letting it sit there getting 0 mpg.
 

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Indeed, by the function/algorithm of the emissions and cooling systems.
Don't be a smart ***, you we're attributing things to the computer more than friction. If the point of PZEV was to heat up quickly it would be like my 83 camaro with 150hp that got 10mpg and was warm by the bottom of the driveway. Even with computer assistance the FB is slow to warm up.
 

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Yup, it is a very slow warmup - I think I drive maybe 2 miles before the temp gauge hits the half-ish mark.

Its also interesting to note that the engine cools super fast. If I drive all day, stop the car for 90 min, the engine gauge is down to cold.
 

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I said function (too), not just algorithm. But if you believe the car’s cabin heat is attributed to friction, have at it.
And name calling on the internet, pffft!!!<O:p
 

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This morning was my first drive in the 30s and it confirmed the car is a bit cold blooded compared to some others I've had or maybe it's a characteristic of 4 cyl vs larger engines. I noticed it was driving at a few hundred more RPM for about 2 miles. All of this nothing against the car but just different than what I'm used to.

The seat warmed fast or at least faster than our Volvo heated seats.
 

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If the point of PZEV was to heat up quickly
Actually that is part of the function of PZEV.

Explaining the Meaning of PZEV with the 2012 Subaru Impreza Premium PZEV | LAcarGUY News

Engine Control Module (ECM)
Vehicle emissions are worse under cold start conditions. Subaru addresses this problem by altering the programming of the ECM to delay ignition timing, making exhaust gases hotter, which helps the catalytic converter heat up sooner, reducing emissions.
 

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The coolant "circuit" through the heater core with the FB is different from the previous engine configurations, and this will lead to a later appearance of warm air from the heater. Ironically, the reason for this intentional delay is to speed up engine warming, as usual, for fuel and emission purposes.

With the previous engines, the heater core is connected to the engine so that coolant is always flowing through the core -- one connection is at the top of the engine, at the water (crossover) pipe, and the other is at the inlet to the water pump. The flow is from the pump, through the engine (around the cylinders and heads) up to the water pipe, to the heater core, and through it back to the water pump inlet.

When the thermostat opens, coolant will also flow (in parallel) from the water pipe to the top of the radiator, down through (or across) the radiator, out the lower radiator hose to the thermostat and then to the pump inlet.

With the FB, the coolant flow through the heater circuit is reduced when the thermostat is closed, and only opens when the thermostat opens. This is effected by a two-sided thermostat. (See attached picture.) The amount of heat available for heating the cabin is reduced until the engine is fully warmed up. But, because engine heat is not being lost to the cabin, the engine will tend to warm up faster than the earlier models.

The apparent absence of cabin heater output in the early stages after cold start up isn't because the engine is slow to warm up.
 

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Discussion Starter #16
Ok people listen; I started the thread because I believed that Subaru was correct in lowering the internal friction of the motor which was the main contributing factor to the warm up time from my old EJ and new FB. Friction=Heat (Looby back me up here). Both EJ and FB were PZEV. So wipe that out of your mind set. I already gave acknowledgement that computer tuning can help increase motor heat. But that is a wash comparing two PZEV motors back to back.

Its possible I'm being a smart *** now asking for Loobys help. You decide.
 

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I am curious about whether SOA has in fact said that is alright to drive off before the blue light goes off. Does anyone know?
 

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I am curious about whether SOA has in fact said that is alright to drive off before the blue light goes off. Does anyone know?
I've seen several people reference this blue light. I have a '13 Limited PZEV and have never seen it. Is it specific to certain models?
 
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