[335icandy]

So dealer replaced both turbos and pretty much everything else under warranty.

How do I maintain the turbo's and keep them in good shape for the next upcoming years?

Do I need to let the car sit for 2-5 minutes everytime I drive it before shutting it off? Or is there an electric cooler that kicks in after the car is shut off everytime?

What is good measure to practice with our N54's?

[marv85]

is your car stock? if it is, then its hard to toast your turbos

the electric water pump does a good job of cooling the turbos after you turn the engine off. However, after a spirited run , I always let it cool down for a couple of minutes.

[rader1]

There's not a whole lot you can do to guarantee long life for your turbos. Let the car idle for atleast 30 seconds after a run and wait for oil to reach operating temp before pushing it hard. Other than that, just be sure to do the required maintenance at the recommended times.
Except the oil changes, DO NOT do the 15K mile oil change interval. Do it every 5K or less(but thats's just my opinion.)

[skim7x]

Originally Posted by rader1

There's not a whole lot you can do to guarantee long life for your turbos. Let the car idle for atleast 30 seconds after a run and wait for oil to reach operating temp before pushing it hard. Other than that, just be sure to do the required maintenance at the recommended times.
Except the oil changes, DO NOT do the 15K mile oil change interval. Do it every 5K or less(but thats's just my opinion.)

^ This is good advice. I do an oil change every 6 months (which, for me, is about every 5k miles).

Also, what was the reason for replacing your turbos? Failure? Or just wastegate rattle?

[335icandy]

Thanks guys! thats good advice... you know how a lot of the previous Turbo tuning guys in Audi's and Supra's and Subaru's use turbo timers... I wondered if that rule of thumb applied to us too.

I am bone stock for now.

I had a misfire that was occurring, and my dealer being the great guys that they are, replaced every little thing that could have caused a misfire, poor fuel mileage, and weak acceleration. The turbo's actually did fail... also had the walnut cleaning done... and every other part you can think of replaced to rule out other variables. Turns out it was a plugged cat! Now the car is running flawless (so strong and fast), and I'm so happy so far. So time to start some baseline dyno's and see where its at.

[skim7x]

Originally Posted by 335icandy

Thanks guys! thats good advice... you know how a lot of the previous Turbo tuning guys in Audi's and Supra's and Subaru's use turbo timers... I wondered if that rule of thumb applied to us too.

I am bone stock for now.

I had a misfire that was occurring, and my dealer being the great guys that they are, replaced every little thing that could have caused a misfire, poor fuel mileage, and weak acceleration. The turbo's actually did fail... also had the walnut cleaning done... and every other part you can think of replaced to rule out other variables. Turns out it was a plugged cat! Now the car is running flawless (so strong and fast), and I'm so happy so far. So time to start some baseline dyno's and see where its at.

We don't need turbo timers... our 335i's have an extra oil cooler that continues to run on electricity after you turn off the car... if you kneel down by your passenger side front wheel well by the oil cooler, you can hear the pump still going for a bit after the car is shut off... this is cooling the turbos. Despite this, however, I still take it easy on the throttle 5 minutes away from my house so the turbos aren't blazing hot when I park.

[themyst]

7500 miles on the oil changes, 25000 miles on the plugs, valve cleaning at 50000 miles

[335icandy]

Great to hear! thank you!

[Beemw335]

New turbos, give them 500 miles of break in, so no wot.
Whwn you start the car, never get on boost until the oil is warmed up, when tou drive aggresively let the car idle 1-2 minutes before shutting it off.
Do regular oil changes and youre set!

[Beemw335]

Originally Posted by skim7x

We don't need turbo timers... our 335i's have an extra oil cooler that continues to run on electricity after you turn off the car... if you kneel down by your passenger side front wheel well by the oil cooler, you can hear the pump still going for a bit after the car is shut off... this is cooling the turbos. Despite this, however, I still take it easy on the throttle 5 minutes away from my house so the turbos aren't blazing hot when I park.

The electric water pump keeps going but when the engine is off oil doesnt flow through the turbos like they would when the engine is running.
Its much better to leave it on and let idle for a minute or two.

[335icandy]

great advice! Thanks guy!

[Beemw335]

Originally Posted by 335icandy

great advice! Thanks guy!

Enjoy the new turbos!
I wish I could get new turbos for free lol

[skim7x]

Originally Posted by Beemw335

The electric water pump keeps going but when the engine is off oil doesnt flow through the turbos like they would when the engine is running.
Its much better to leave it on and let idle for a minute or two.

Where did you get this information? Why would the oil not flow like it would when the engine is running? Not trying to be aggressive or anything, but I've never heard that before and would like to read more about it. Thanks!

[335icandy]

Originally Posted by Beemw335

Enjoy the new turbos!
I wish I could get new turbos for free lol

Thanks!

Amazing the difference all new parts made!

[Beemw335]

Originally Posted by skim7x

Where did you get this information? Why would the oil not flow like it would when the engine is running? Not trying to be aggressive or anything, but I've never heard that before and would like to read more about it. Thanks!

The oil pump is mechanical and the engine needs to be on for it to run, theres an electric water pump that runs once the engine is shut off.
Im 99% sure that oil doesnt circulate through the turbo once the engine is off, if im wrong someone please correct me.

[MilehighM3]

You are correct. The oil pump is mechanical and driven by the crankshaft. So if the engine is off, obviously there is no oil flow short of gravity draining residual oil into the pan. The N54 as well as all other NG6 BMW engines use an electric water pump only. No belt driven units any more. It will run as needed to cool the engine, not necessarily just the turbos.

[Beemw335]

Originally Posted by Bmw135er

You are correct. The oil pump is mechanical and driven by the crankshaft. So if the engine is off, obviously there is no oil flow short of gravity draining residual oil into the pan. The N54 as well as all other NG6 BMW engines use an electric water pump only. No belt driven units any more. It will run as needed to cool the engine, not necessarily just the turbos.

Yup, I was sure it was like that, thanks for confirming.
Op, as long as you let it idle 1-2 minutes theres no problems.

[335icandy]

Electric waterpumps mean lower failure rates? they don't need to be replaced as good measure when doing higher mileage services?

[MilehighM3]

It's done more for efficiency. It's part of how BMW reduces parasitic power loss, while increasing power delivery to the wheels as well as fuel economy while lowering emissions. Since that's what the world is all about. It's a pretty complex water pump in terms of logic, control and monitoring. If there's a problem, the car won't hesitate to let you know. Warnings in the cluster and auxiliary fan on high speed are usually a dead give away that it's a water pump and/or thermostat.

[335icandy]

Interesting... thanks for the explanation Bmw135er.

[tscdennab]

Originally Posted by 335icandy

How do I maintain the turbo's and keep them in good shape for the next upcoming years?

Well, don't tune your engine to more than 16-17psi and I think you should be ok.
But obviously if you run stock the turbos will last longer.

[marv85]

Originally Posted by Beemw335

The oil pump is mechanical and the engine needs to be on for it to run, theres an electric water pump that runs once the engine is shut off.
Im 99% sure that oil doesnt circulate through the turbo once the engine is off, if im wrong someone please correct me.

Originally Posted by Bmw135er

You are correct. The oil pump is mechanical and driven by the crankshaft. So if the engine is off, obviously there is no oil flow short of gravity draining residual oil into the pan. The N54 as well as all other NG6 BMW engines use an electric water pump only. No belt driven units any more. It will run as needed to cool the engine, not necessarily just the turbos.

Originally Posted by Beemw335

Yup, I was sure it was like that, thanks for confirming.
Op, as long as you let it idle 1-2 minutes theres no problems.

Yes the oil pump is definitely mechanical while the water pump is electrical.
just to make it clearer, the images below are from realoem. one shows the oil pump and the other shows the oil pump drive which is obviously mechanical.