Tompoodie

Just finished breaking in '23 C2 PDK. Was using sport during the break in period to maintain 2-4K RPM as instructed.
Now that I have tried normal mode, and see how low the RPMs are consistently maintained, I wonder if
using normal mode reduces engine longevity, especially main bearings. Opinions?

Also any opinions on how long to idle the engine before turning off to prevent coking of the turbo bearings?
Conventional wisdom is 2 minutes.

dudeoverthere

does the manual say to idle for any length of time to cool the turbos?

all i know is that i run in sport mode at all times, unless i am insterstate cruising flattish roads at 75+. try to hit redline at least once a drive at the onramps. turn the car off as soon as i park. listen to the fans and pops as thing cool.

Jeahbladejeah

Lugging is not the same as low rpm use.
And there is no chance people are idling their cars for 2 minutes before shut off. Maybe maybe after a hard track day to cool everything off, but even that is best done while moving.

Tompoodie

I do drive slowly for a few blocks on the way home which may or may not be sufficient for cooling the oil in the turbo bearings.
Perhaps I used the term lugging too loosely, specifically; I am referring to driving 20-50 MPH at 1000-1200 RPM.

ipse dixit

Don’t overthink it.

You’re not lugging the engine and you don’t need to cool your turbos.

Just drive the car, change oil regularly, warm her up properly before WOT and the car will probably out live you.

eagle1960

IMHO lugging refers to manual trans vehicles when you try to add more throttle than the engine will reasonably accept and thus you get a bucking sort of reaction. Auto trans and especially PDK will not allow you to lug the engine.

jlegelis

- Friends don't let friends drive in Normal mode... after putting on my seat belt my very first move is to change to Sport mode for a zillion reasons. You should too unless you are in city traffic.
- 'Coked bearings'... lol, "this is not your grandfather's Turbo". All modern turbo engines are water and oil cooled to reduce heat soak concerns, while advances in synthetic oil have also helped. Here's a 991 turbo with cooling fittings highlighted. Unless you are at the track I wouldn't spend a moment thinking about it. My BMW N55 turbo were at 90k miles of 'exuberant' driving and totally fine.

Tompoodie

I am in Sport in canyons...wife likes normal.
Thank you all for your help. I will park it and shut her down.

shrimp money

I knew I kept my old GReddy Turbo Timer for a reason!