Originally Posted By: StevieC
From what I have read here and have experienced I would say the following:
Normal - Summer like conditions: Start, wait a few seconds and go, drive easily (not like grandma) until engine is up to temperature.
Cold - Winter like conditions: Start and wait 30 seconds for oil to circulate and go, drive easily (not like grandma) until the engine is up to temperature.
Now the same advice applies to a Turbo engine, just don't create any boost until the engine has been at operating temperature for at least 10 minutes so the oil has had a chance to properly circulate in the turbo and warm the turbo's bearings.
Follow this and you will have tons of trouble-free driving.
Oil gets to the turbo bearings instantly. I've seen this first hand when I forgot to install the drainback tube and it's a very high quantity going through there when dead cold. By the time I could walk 4 feet to shut the car off I had a couple quarts on the ground.
Not hitting boost until it's warm isn't the best idea. You realize >1psi boost is the equivilent of wide open without the turbo so I would say drive it very easy regardless of vaccum/boost.
Turbo bearings don't require warmup. The only thing that's going to suffer turbo related from going WOT from the second you start it is slower spool from the thick oil.
If we're only waiting for oil to circulate, then starting the engine, putting on the seatbelt, and putting it into drive is twice the amount of time you need. Personally, I like to get a little heat in the pistons, up to 1 minute in the winter and then drive it very easy. Piston to cylinder is the clearance that changes the most from cold to hot. Bearings are barely a concern. In the summer I start and go but I'm fortunate to have a drive through the neighborhood that doesn't require more than 1/8 throttle and 1,500rpm for nearly 5 minutes.
And what's with the signature?