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Old 12-09-2004, 05:42 PM   #1
subenerd
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Default How long do you warm up your car?

I usually wait until the temp needle moves above the bottom line until I drive(2 - 5 min), and then wait until the needle is at the normal halfway point before I touch 4K+ rpms.

What do you do?
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Old 12-09-2004, 05:46 PM   #2
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that's a good habit, it depends on the weather too.
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Old 12-09-2004, 05:47 PM   #3
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Get in, start, put in gear, drive slowly until the temp comes up.

-George
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Old 12-09-2004, 05:51 PM   #4
ydant
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Drive < 3k, no quick accel until meter reaches normal position (about 1/6th the way above the bottom line). Then I flog it. Only time I let it sit after starting is if the idle is high - then I let it calm down a little bit.
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Old 12-09-2004, 05:53 PM   #5
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All good answers.. Im right there with you...
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Old 12-09-2004, 05:56 PM   #6
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10-20 seconds unless she's covered with snow. In modern, fuel injected cars, it's better to just drive off gently right away than to let the car idle. The computer adjusts the a/f levels so the engine runs smoothly and by driving gently you more quickly circulate oil and more evenly heat up the engine and transmission.
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Old 12-09-2004, 06:00 PM   #7
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Start up car. Turn on heater and go back inside house. Take a crap. Then come back to my car and leave.
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Old 12-09-2004, 06:07 PM   #8
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Stanley-

Do you thing there is anything wrong with letting it idle for a few minutes before driving?
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Old 12-09-2004, 06:42 PM   #9
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1-2 minutes when it's cold... then drive it off boost for about 5-10 minutes ... then I drive normally...
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Old 12-09-2004, 06:44 PM   #10
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It's actually considered bad for the engine if you let it sit and idle for more than 30-60 seconds.

Just start, let the thing run for 5-10 seconds, then drive. Keep under 3,000 RPM or so until fully warm.

Also, just because the temp needle is at the normal operating temp area, it doesn't mean the oil has fully warmed up (as it takes longer to warm up than anti-freeze)... So if you want to be safe, wait another couple of minutes after "fully" warm before you start getting on it.
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Old 12-09-2004, 06:45 PM   #11
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Quote:
Originally Posted by subenerd


Stanley-

Do you thing there is anything wrong with letting it idle for a few minutes before driving?

You are just wasting gasoline letting it idle.

Drive gently when the car is cold, no need for extended warmup. Your car warms up faster when it is moving.
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Old 12-09-2004, 07:06 PM   #12
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Quote:
Originally Posted by JGard
Also, just because the temp needle is at the normal operating temp area, it doesn't mean the oil has fully warmed up (as it takes longer to warm up than anti-freeze)... So if you want to be safe, wait another couple of minutes after "fully" warm before you start getting on it.
Thats a very good point that a lot of people don't realize. To put it into perspective, when my water temp guage shows that the water is at normal temperature, my oil temp guage hasn't even started to move yet. It is probably about 50 degrees celcius, and isn't at its running temperature (85-90 degrees celcius) for another 4 or 5 minutes.

To answer the original question, I let my car warm up for maybe 30 seconds if its really cold then i just drive off boost until the car is warmed up...
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Old 12-09-2004, 07:22 PM   #13
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you learn something new everyday
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Old 12-09-2004, 07:31 PM   #14
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wow. lots of useful advice.
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Old 12-09-2004, 07:53 PM   #15
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Quote:
It's actually considered bad for the engine if you let it sit and idle for more than 30-60 seconds.
It's also bad to drive a car with to much ice on the windshield. In cold weather states let it warm enough to drive away safely.
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Old 12-09-2004, 08:06 PM   #16
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I find it interesting that you say it takes longer for the oil to get up to operating temperature than the engine coolant. I am in Georgia Tech motorsports and last week I asked our engine guy how long it actually takes before the oil is warm enough to go ahead and drive the car hard. His answer "basically right away. The oil gets warm enough real fast. So as long as you arent turning it on and immediately flooring it, you should be fine."

So either he was wrong or the oil doesnt have to be up to full temperature before it is safe to go ahead and drive the car.

I generally wait until the coolant guage is up to the 2nd of the 4 lines.
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Old 12-09-2004, 08:10 PM   #17
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Quote:
Originally Posted by JGard
It's actually considered bad for the engine if you let it sit and idle for more than 30-60 seconds.

I'm not arguing this but can anyone give me a technical answer to why.
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Old 12-09-2004, 08:23 PM   #18
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Quote:
Originally Posted by kbarb03
I find it interesting that you say it takes longer for the oil to get up to operating temperature than the engine coolant. I am in Georgia Tech motorsports and last week I asked our engine guy how long it actually takes before the oil is warm enough to go ahead and drive the car hard. His answer "basically right away. The oil gets warm enough real fast. So as long as you arent turning it on and immediately flooring it, you should be fine."

So either he was wrong or the oil doesnt have to be up to full temperature before it is safe to go ahead and drive the car.

I generally wait until the coolant guage is up to the 2nd of the 4 lines.
Is that the Formula SAE team? Those are much smaller engines, which may be why he said that. It could also have to do with the oil system on that particular car. I know our university's car has a very different oil system than most mass-produced vehicles.
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Old 12-09-2004, 08:26 PM   #19
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start up, keep revs soft and under 3k until temp needle is right smack in the middle
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Old 12-09-2004, 08:26 PM   #20
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If you have an oil temp gauge you can see firsthand that the oil lags well behind the coolant in coming up to temperature. The temp gauge may come up to the normal operating range after a very short time, but it takes a lot longer for the oil temp to come up.
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Old 12-09-2004, 08:30 PM   #21
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Quote:
Originally Posted by Trunk_Monkey
I'm not arguing this but can anyone give me a technical answer to why.
There could be many reasons one would say that, I know of a couple:

1) When you let the car idle to warm up it's cold longer than if you started driving. The engine wears more when it's cold because it was designed and manufactured with tolerances for when it's at normal operating temperatures. When it's cold, the cylinders are smaller and therefore wearing more (lots of other parts are at different fits as well).

2) When you sit and idle without moving, the engine warms but the transmission doesn't. So people will think there car is safe to drive hard and really still be driving on a brittle transmission.
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Old 12-09-2004, 08:30 PM   #22
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Quote:
Originally Posted by Trunk_Monkey
I'm not arguing this but can anyone give me a technical answer to why.
I wish I could give a technical answer...but letting an engine idle for an extended period of time, cold or warm, is generally worse for it than running at normal operating speeds.
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Old 12-09-2004, 10:09 PM   #23
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Quote:
Originally Posted by Andrman
Is that the Formula SAE team? Those are much smaller engines, which may be why he said that. It could also have to do with the oil system on that particular car. I know our university's car has a very different oil system than most mass-produced vehicles.
Unless the rules have changed since the mid 90's, I believe motorcycle engine is often used. The oil temp probably rises faster than those in larger engines.
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Old 12-09-2004, 10:14 PM   #24
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Quote:
Originally Posted by Andrman
Is that the Formula SAE team? Those are much smaller engines, which may be why he said that. It could also have to do with the oil system on that particular car. I know our university's car has a very different oil system than most mass-produced vehicles.
Yeah...the engine we use is a Honda F4i i think. But I was asking about cars specifically.
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Old 12-09-2004, 10:23 PM   #25
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If I'm not mistaken, in a motorcycle (sport bikes) the same oil is used to lube the engine as well as the tranny so its viscosity is slightly diffrent than that of regular automotive oil. Or am I just smoking something and not sharing?
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