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Old 01-06-2013, 06:21 PM   #226
ManualOverAuto
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Join Date: Dec 2011
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2001 Impreza L coupe
Sedona red Pearl

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Quote:
Originally Posted by tibug View Post

Sounds fishy to me. I've never heard that Subaru piston slap was anything other than an annoyance with very minor effects on longevity. However, there is plenty of evidence that prolonged cold idle periods are quite bad for the vehicle.
You very well may be right.

I weighed out my options a while ago:
1. Drive very slowly until it warms up
2. Let it idle to warm up

Number 1 isn't possible because of the many steep hills around me, every where I can drive. Even going very slowly, like 1st and 2nd gear, a steep hill will put enough load on the engine to make it slap a lot worse.

So I figured the best thing for reliability and longevity was to just let it warm up a few minutes longer, rather than drive those few minutes.

I guess we'll see how it holds up in the next few years, lol.

I'm at 128,000 miles, and my goal is 200,000
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Last edited by ManualOverAuto; 01-06-2013 at 09:30 PM.
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Old 01-06-2013, 07:22 PM   #227
scoobyrex123
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Join Date: Dec 2011
Location: eastern ky
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2004 wrx hybrid
silver

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i have full forged internals so i was told i need to wait for my car to be around 160 degrees before driving it due to the metal expanding and clearances, i will be investing in a remote start soon haha!
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Old 01-06-2013, 07:25 PM   #228
Slurpyy08wrx
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Start it in garage, back out and drive very slowly, i don't even go into boost until temp is at normal temp range 185, can't let it idle do to the loud ass catless nvidia setup I have on my 2013 wrx, wakes the baby up if I let it idle in the driveway. So I drive very slowly/coast alot during first 5-10 min.
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Old 01-06-2013, 09:36 PM   #229
tibug
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2003 Outback
RUST

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Quote:
Originally Posted by ManualOverAuto View Post
You very well may be right.

I weighed out my options a while ago:
1. Drive very slowly until it warms up
2. Let it idle to warm up

Number 1 isn't possible because of the many steep hills around me, every where I can drive. Even going very slowly, like 1st and 2nd gear, a steep hill will put enough load on the engine to induce slapping.

So I figured the best thing for reliability and longevity was to just let it warm up a few minutes longer, rather than drive those few minutes with my pistons screaming at me.

I guess we'll see how it holds up in the next few years, lol.

I'm at 128,000 miles, and my goal is 200,000.
While I'm still skeptical, you do bring up a good point that's not just about piston slap. My work is almost right off the highway. When I go home, I hop on the interstate and right off the entrance ramp begins a huge hill. I can't very well go slow on the highway, so I've got to get up to speed quick. If I just hop in my car and go, I'm in fourth or fifth gear and giving it close to full throttle within a minute or two of starting the engine. It's impossible to take it easy on the engine if I do this. In this situation, especially in the winter months, I do prefer to let the car warm up or to drive around a bit before heading out on the interstate.

That has nothing to do with piston slap, though; that's just general concern for the engine. My car doesn't actually have enough piston slap to worry me, even in cold weather. Or perhaps the sound is masked by all the valvetrain noise.
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Old 01-06-2013, 09:45 PM   #230
HeroCrank
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I will idle the car until the temp needle crosses the first line, then I drive easy with no boost until full operating temp.
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Old 01-06-2013, 10:00 PM   #231
xrossyx
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about enough time to roll a perfect cigarette.

then im off!
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Old 01-06-2013, 10:07 PM   #232
JokerGT
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UGM

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This thread crack me up..

I wait till the idle drops from its original position. (1-2mins)
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Old 01-06-2013, 10:59 PM   #233
bestfromnw
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start up and let it run for a minute and then drive like a gramma untill it warms up
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