[lito]

My 2009 335i with just a little 100k miles need new turbos. What else should i consider replacing besides new turbos. Im thinking waterpump, tstat. Anyting else?

[Tyc0]

Maybe engine mounts, definitely oil pan gasket, ALL of the coolant and oil line O rings. Unless they are messed up I don't see why just cleaning the lines themselves isn't okay. If you buy the turbo seal kit it will come with new all of those o rings, plus down pipe to turbo gaskets, along with manifold gaskets, and studs and copper nuts which you will need. That's all the stuff I did, can't think of anything else.

[iqraceworks]

Oil pan gasket, and engine mounts would be smart to do since you will have the subframe dropped. Water pump and thermostat would be smart to replace if they have a lot of miles on them.

[ab987]

Absolutely oil feed and drain lines, they can be clogged partially with carbon depending on how it has been let cool down in its lifetime

[iqraceworks]

Originally Posted by ab987

Absolutely oil feed and drain lines, they can be clogged partially with carbon depending on how it has been let cool down in its lifetime

Not that it's the right thing to do.... But I've heard from several reputable people that as long as you can clean them out well with brake cleaner and put new o-rings on them, the oem lines that are on the car work great since they are already molded into the correct shape. Sometimes the new lines will kink when you install them, causing flow restrictions, causing short turbo life.

That being said...if they are in such bad shape that you can't get them completely clean on the inside.....by all means, replace them.

I'm getting ready to install my new RB TWO's here in a few days...if the lines look ok, I'm just going to clean them and resuse them.

[Tyc0]

Originally Posted by iqraceworks

Not that it's the right thing to do.... But I've heard from several reputable people that as long as you can clean them out well with brake cleaner and put new o-rings on them, the oem lines that are on the car work great since they are already molded into the correct shape. Sometimes the new lines will kink when you install them, causing flow restrictions, causing short turbo life.

That being said...if they are in such bad shape that you can't get them completely clean on the inside.....by all means, replace them.

I'm getting ready to install my new RB TWO's here in a few days...if the lines look ok, I'm just going to clean them and resuse them.

Did this with my RB two install, cleaned them out and used new o rings, been about 3k miles running strong no leaks

[mweisdorfer]

Originally Posted by lito

My 2009 335i with just a little 100k miles need new turbos. What else should i consider replacing besides new turbos. Im thinking waterpump, tstat. Anyting else?

O-rings on all the various coolant lines. Engine mounts, trans mounts, oil pan gasket. Water pump, t-stat. Put blue locktite on the 3 power steering pump bolts. New belt & pulleys.

[IllSic_Design]

Originally Posted by mweisdorfer

O-rings on all the various coolant lines. Engine mounts, trans mounts, oil pan gasket. Water pump, t-stat. Put blue locktite on the 3 power steering pump bolts. New belt & pulleys.

This pretty much. Definitely new o-rings(atleast, if not new flex hoses) on ALL coolant lines/the big aluminum pipe going to the head. Let me tell you, it's not fun 50k miles later after turbos to need to change out some coolant pipe/hose o-rings when they start leaking. A lot easier when everything is removed

[ab987]

Originally Posted by iqraceworks

Not that it's the right thing to do.... But I've heard from several reputable people that as long as you can clean them out well with brake cleaner and put new o-rings on them, the oem lines that are on the car work great since they are already molded into the correct shape. Sometimes the new lines will kink when you install them, causing flow restrictions, causing short turbo life.

That being said...if they are in such bad shape that you can't get them completely clean on the inside.....by all means, replace them.

I'm getting ready to install my new RB TWO's here in a few days...if the lines look ok, I'm just going to clean them and resuse them.

Do as you please but I don't think it's worth "saving" $120 over something that could kill your brand new turbos. I thoroughly cleaned out my oil lines and I've had sirening since day one, I don't think they are getting proper oil flow because there is simply carbon that is too thick or inaccessible for me to clean. Possible? Sure. Smart? Not as much.

[haaken675]

I would absolutely do the oil pan gasket, motor mounts if you havnt already, new turbo oil feed lines (They tend to stick), inlets, water inlet line gasket and coupler, and silicone vacuum lines. Personally,if i were todo it again i would yank the motor for ease of everything and do the clutch at the same time...Working on your back like the redlight district sucks....

[_N54]

Might as well get some inlets and outlets

[stewbets]

Originally Posted by ab987

Do as you please but I don't think it's worth "saving" $120 over something that could kill your brand new turbos. I thoroughly cleaned out my oil lines and I've had sirening since day one, I don't think they are getting proper oil flow because there is simply carbon that is too thick or inaccessible for me to clean. Possible? Sure. Smart? Not as much.

Meh, I saved the money and reused them. I wanted to keep my turbo-replacement total under $1k. Why? Because I wanted to. I only bought a few manifold studs and nuts to replace the especially bad ones. I also used the gaskets that came with the turbos, which is another no-no. I did replace all the o-rings because I'm not a total barbarian. It's been about 2.5k miles since. No issues.

[C.Pop]

engine mounts, oil pan gasket, waterpump, thermostat, vacuum lines, suspension, engine, vehicle.

[Saif2018]

Originally Posted by ab987

Do as you please but I don't think it's worth "saving" $120 over something that could kill your brand new turbos. I thoroughly cleaned out my oil lines and I've had sirening since day one, I don't think they are getting proper oil flow because there is simply carbon that is too thick or inaccessible for me to clean. Possible? Sure. Smart? Not as much.

Sirening from brand new turbos since day one?

[lito]

Damn! Thats a lot of things needed to be replaced. I really want to keep the car for another 100k, but is it really worth it😔

[stewbets]

Originally Posted by lito

Damn! Thats a lot of things needed to be replaced. I really want to keep the car for another 100k, but is it really worth it😔

Corn Pop may have been a bad dude, but his list is on point.

Sometimes the "while you're in there" list can go a little overboard. Who's doing the work? If you're paying a shop, it often makes sense to have a little more done to cut down on the labor costs. But if you're doing the work yourself, you can be a little more judicious and only fix what's broken/leaking. I'd prioritize my list in the following order of importance:

1. feed line o-rings, manifold studs/nuts, vacuum lines
2. oil pan gasket (obviously changes to 1 if it's leaking)
3. water pump
4. engine mounts

There are some other things mentioned in this thread that have nothing to do with the labor for a turbo install. You could do them anytime.

[Mustafa.e92]

Waterpump is a big price item if you have a Rwd and budgets tight I'd hold off on it. Not a difficult job if ur doing ur own work

[iqraceworks]

Originally Posted by ab987

Do as you please but I don't think it's worth "saving" $120 over something that could kill your brand new turbos. I thoroughly cleaned out my oil lines and I've had sirening since day one, I don't think they are getting proper oil flow because there is simply carbon that is too thick or inaccessible for me to clean. Possible? Sure. Smart? Not as much.

I'd be willing to bet a large amount of money that your "Sirening" issue has absolutely nothing to do with carbon in your oil lines. What turbos are you running? Please don't say ebay China turbos....

[ab987]

Originally Posted by iqraceworks

I'd be willing to bet a large amount of money that your "Sirening" issue has absolutely nothing to do with carbon in your oil lines. What turbos are you running? Please don't say ebay China turbos....

Nope, brand new OEM turbos. That's the only thing I can think of that would cause it on new turbos. They have boosted fine the whole time and oil analysis came back clean but they sure do siren

[ab987]

Originally Posted by Mustafa.e92

Waterpump is a big price item if you have a Rwd and budgets tight I'd hold off on it. Not a difficult job if ur doing ur own work

Agreed here. I've done them on 2 cars now, one N52 and one N54 with subframe in and turbos in, it's actually a pretty easy job to be honest. I wouldn't spend $400+ on something that is fairly new (in my case). When they fail you usually get enough warning to pull off in my experience, and hope you have AAA

[Saif2018]

Originally Posted by ab987

Nope, brand new OEM turbos. That's the only thing I can think of that would cause it on new turbos. They have boosted fine the whole time and oil analysis came back clean but they sure do siren

I get the feeling OEM turbos just can't handle boost well, and just siren?

Hardly ever hear about any hybrids sirening.

[ab987]

Originally Posted by Saif2018

I get the feeling OEM turbos just can't handle boost well, and just siren?

Hardly ever hear about any hybrids sirening.

Yeah, it's possible. It's hard to tell because on stock tune the wastegates are wide open until you want the full monstrous 6-8psi, so there's not really transient spool where you'd hear it. Mine has definitely gotten worse, though. I did not see any scoring or anything on my original 84k mile turbos that made the exact same noise, I tore one down and only saw a very small (thousandths of an inch) loss of material on the thrust bearing. But then you have to think, there must be a lot of energy going somewhere for the siren to be that loud. Something's not happy.