[jakes_new_toy]

I think warrorbob or somebody else at the PVO meet and greet 6 months ago talked to PVO peeps about this. They had said that if you let the car drive home easy for 1 min or 2 that was more then enough. as for me start up and go dont hit it hard until 200F drive easy for the last min or so. all is good

 

[knieght rieduz]

Best way to warm up an engine is to drive it. Once it gets decently warmed up then you can start pushing it.

common misconseption. auto makers would love for you to do this because your car warms up faster while you're driving it (= less harmful emmisions once its warmed up) so they want you to drive it to warm it up.

the best thing to do if you have the patience (and its better for the car) is to start the car and let it idle for a minute or two. emissions will be worse off than if you just started driving it, but better for the engine.

-Mitesh

 

[SRT-4aKId]

45 seconds, about. And guys, is she supposed to run at 205 degreesish?

 

[blab10]

I usually leave mine running for about 5 min before I leave to work in morning. The temp gauge is usually about 1/4 of the way up when I leave my house. As far as cool down goes, I have the TT take care of that for me. It is set at 2:30.

 

[Neo]

common misconseption. auto makers would love for you to do this because your car warms up faster while you're driving it (= less harmful emmisions once its warmed up) so they want you to drive it to warm it up.

the best thing to do if you have the patience (and its better for the car) is to start the car and let it idle for a minute or two. emissions will be worse off than if you just started driving it, but better for the engine.

-Mitesh

you're wrong. Sometimes a cold idling engine is worse than a cold moderately running engine. I had an M3 and everyone, including manufacturer suggested to not let the car idle to warm, FOR ANY REASON.

As far as "waiting for normal operating temperature", isn't that the water temp? Cause the head can be hot and the block still fairly cool. I usually wait until 5 min+ AFTER I get to 190+ degrees.

Cool down.. I usually give it like 10-30sec normal driving.. harder driving and then anywhere from 1-3 min

-A

 

[gabeg]

i dont let my car warm up either. i just keep the rpm under 3k and usually not even above 2500. as for cool down i just let the last few minutes of driving be the cool down(how much heat can i generate cruising at 1500-1900 rpm anyway?) although i do think a cool down is helpful, just not critical.

One thing thats always bothered me however is a statement made by author corky bell in his book maximum boost. im paraphrasing but he says the idea of letting the car cool down is foolish and that the oil will not coke up or do anything else and that a real "hot shutdown" is turning off the motor under boost. He is a very knowledgable man on turbos but this just seems to go against common sense. if the turbos hot and the oil isnt moving the oil heats up and breaks down. it just seems logical right? any ideas why he would disagree with pretty much everyone who ever lived about letting the turbo cool?

 

[knieght rieduz]

you're wrong. Sometimes a cold idling engine is worse than a cold moderately running engine. I had an M3 and everyone, including manufacturer suggested to not let the car idle to warm, FOR ANY REASON.

never heard that before, but thanks for the info. what type of block? i'm passing on info that i've learned through ASE prep courses and from other techs.

 

[verb8m]

I let my car warm till the dial goes into the first segment, then I keep it 3000 rpm & under with no boost till it reaches 200. If Ive been driving hard, I let it cool about 3-4 min.

 

[ptc01]

Shop manual states if driven hard allow 3 minutes for turbo cool down. Otherwise you could cause damage.

 

[Racin-Jason]

30secs-1minute before driving..then go easy on it for a couple more minutes or until i see the temp guage above 1/4.

Only cool it when ive been beating on it within the last 5 minutes. 3 minutes there

 

[Neo]

never heard that before, but thanks for the info. what type of block? i'm passing on info that i've learned through ASE prep courses and from other techs.

Iron block, aluminum head. I am fairly sure that the reasoning in the M3s was something about oil coverage. Now.. certainly, you don't want to start the car and immediately put it under full load. I generally start my car and let the oil circulate for at least 15 seconds or so. After that it should be ready for moderate driving.

-A

 

[gabeg]

so no one has a comment on what corky bell says?