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YOUR RESEARCHGood explanation why Not to warm engine before driving
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Adjust itself
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"With fuel-injected engines, the ECU can adjust itself to idle perfectly even in sub-zero weather."
Good explanation why Not to warm engine before driving
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idling perfectly and running efficiently are not the same thing.
Good explanation why Not to warm engine before driving
Run when its very cold (even
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Lots of carb cars will barely run when its very cold (even with choke) or be very lumpy and rough.
Good explanation why Not to warm engine before driving
Use 30-45 seconds
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same procedure here, my Carrera is always garaged so I start it and use the 30-45 seconds to buckle up, plug in radar, install sunglasses
Good explanation why Not to warm engine before driving
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I found this explanation very relevant to us 996 owners. Especially the fact that oil will be diluted and provide less protection letting the engine warm up in cold temps.
http://www.roadandtrack.com/car-cult...m-up-your-car/
seem to contradict himself
"With fuel-injected engines, the ECU can adjust itself to idle perfectly even in sub-zero weather."
This implies the injectors are not squirting un needed fuel into the combustion chambers.
not really.
idling perfectly and running efficiently are not the same thing. Lots of carb cars will barely run when its very cold (even with choke) or be very lumpy and rough. FI cars tend to be able to idle mostly smoothly and evenly at cold temps. That doesn't mean they can get around the fact that with a cold combustion chamber, you need a richer a/f ratio.
While I generally agree with the guys point of view, I think he needs to be more precise when doing things like showing us the oil swishing. How much fuel to oil are we seeing there.
You should meet my neighbor. Doesn't matter what the weather is like or how recently he turned the car off the previous time. They use their remote start and regularly let them idle 15 minutes. 30 minutes isn't uncommon and once I timed it at 1.5 hours!!!
The guy is a "mechanic" too
I read this in the manual. It does seem counter intuitive not to warm a engine up before putting it under load. It goes against every high performance motorcycle/car/truck I have every owned. I know the environmentalist probably have put some influence into not wasting fuel regardless if it's good or not for the longevity of your engine. I have read in many p;aces that 1-2 minutes of warming up is all it takes.
I let my 996 warm up untill the idle drops and then go. I do not drive the car hard for a few miles. I also let my car cool down after driving hard before shutting it down.
On all my air cooled 911s, I would raise the deck lid after a hard drive to cool it down easier. Anyone else do this with their cars?
when you're hauling kids in a car at -40 celcius, you're gonna warm it up.
usually theres an inch of ice on the windshield you will have to deal with also. press auto start, go ****, shave and shower, and after all that, your car is now warm and ready with no more ice blocking your view.
I let mine warm up as long as it takes to plug in the radar detector and click into the seat belt. Sometimes, if it is a Really Cold day (we're talking an arctic 62 degrees) I might let it warm up a few seconds more.
all cars of modern manufacture say the same thing.
I think it boils down to this. The pistons are slightly elliptical when cold so they don't stroke the cylinders tightly. Driving lubricates and increase temperatures faster than idling and therefore gets the piston shape rounded more quickly than idling does.
Any Germans out there, please chime in and keep me honest.
I'm not sure if this is still the case nowadays, but back in the late 80's there were laws in Germany that limit warming up cars to 3 minutes. It was a ticketable offense.
I start car, buckle seat belt and start driving. I do try to keep revs under 3-4k until car gets up to temp..
same procedure here, my Carrera is always garaged so I start it and use the 30-45 seconds to buckle up, plug in radar, install sunglasses
I have 3 routes to main roads all are over 1/2 mile so the temp gauge is starting to move by the time I get to 45mph roads
I don't consider the engine fully warmed up till the oil pressure drops to between 3-4 bar
I had a couple of smokey start ups well over a year ago, so I adopted a process of cooling down the last 1/2 mile (25 mph zones) below 3k rpms and shutting down all the systems while at idle, about 30 seconds, since then
not a puff
