335D turbo issues
Discussion
The 2006-2012 335D twin turbo coupe seems to need the turbos sorting somewhere between 60-100K miles. Mine have just gone awry at 77,000 miles. (Has anyone got one with original and un-repaired turbos at a high mileage?)
Cost-wise the BMW official dealer quoted 16 hours labour and £690 to a turbo specialist and the bill was crazy, around £2750. An independant is doing it for £970, way better.
It's still a fabulous all round car and Simon at E Maps for £299 gave it a really useful boost in general shove, a mod i recommend fully.
Cost-wise the BMW official dealer quoted 16 hours labour and £690 to a turbo specialist and the bill was crazy, around £2750. An independant is doing it for £970, way better.
It's still a fabulous all round car and Simon at E Maps for £299 gave it a really useful boost in general shove, a mod i recommend fully.
Turbos can go, but then plenty will just go on and on- remapping to boost performance is never going to help longevity of turbos as you will be making them work harder than what the manufacturer decided they should.
Is it the big turbo or small turbo that needs replacement? The small turbo can be done from the top and will only take a couple of hours. Even the big turbo is not a 16 hour job
What is the issue that you are having?
Is it the big turbo or small turbo that needs replacement? The small turbo can be done from the top and will only take a couple of hours. Even the big turbo is not a 16 hour job
What is the issue that you are having?
Mine was standard, I bought at 72k and ran to just shy of 140k in my ownership. Regular servicing, & a thermostat was all it had to 125k from new, then the hydro/dsc unit went. Engine was still fine when I sold it on.
If you remap, you’re invariably going to decrease the lifespan of components - but by how much will be massively variable, by definition it’d have to be user & usage dependent. Probably 90% of my mileage was m-way, which really isn’t that heavy a duty cycle.
One example isn’t proof (either way), but there are a lot of these engines out there, and many have done lots & lots of miles. If it were a regularly problematic engine (like the s85 for bearings), it’d be common knowledge by now considering the age of some of the cars the engine is in will be approaching 14 years. For what it is, it’s a good engine, and it’s only recently that the other manufacturers have caught it up in terms of overall capability/cost balance, IMO.
If you remap, you’re invariably going to decrease the lifespan of components - but by how much will be massively variable, by definition it’d have to be user & usage dependent. Probably 90% of my mileage was m-way, which really isn’t that heavy a duty cycle.
One example isn’t proof (either way), but there are a lot of these engines out there, and many have done lots & lots of miles. If it were a regularly problematic engine (like the s85 for bearings), it’d be common knowledge by now considering the age of some of the cars the engine is in will be approaching 14 years. For what it is, it’s a good engine, and it’s only recently that the other manufacturers have caught it up in terms of overall capability/cost balance, IMO.
The turbos don;t usually go wrong.
Around that mileage you lose low end power/boost. This is because the vacuum hose is split. It runs across the top of the little turbo in a foil wrap.
There are also changeover valves which control the vacuum between the 2 turbos.These also fail but in my experience impact the bigger turbo.
Check the hoses and changeover valves first before you start to pay out for turbos.
Another common diagnosis is that turbos have failed because there are oil leaks. The manifold leaks and also the red intercooler boost hose. These are common on that engine and not necessarily due to turbo failure.
Around that mileage you lose low end power/boost. This is because the vacuum hose is split. It runs across the top of the little turbo in a foil wrap.
There are also changeover valves which control the vacuum between the 2 turbos.These also fail but in my experience impact the bigger turbo.
Check the hoses and changeover valves first before you start to pay out for turbos.
Another common diagnosis is that turbos have failed because there are oil leaks. The manifold leaks and also the red intercooler boost hose. These are common on that engine and not necessarily due to turbo failure.
The issue was big turbo not working, foot down the revs would go to 3,500 rpm and stay there in the same gear. If i feathered the pedal instead it would go through the gears using the small turbo only. I had already had the hoses changed. It turned out to be the actuator for the lower big turbo, not working at all.
Anyway £350 later it has a new actuator and is running great. As far as the mapping goes it's a fairly mild map, raising power by 59 bhp but getting rid of the flat spot the standard car has and the car revs better at the top end. Most of my cars are or were mapped but if you do it sensibly and don't boot the car from a standing start it's usually fine, especially if you also use the best fuel you can get.
Anyway £350 later it has a new actuator and is running great. As far as the mapping goes it's a fairly mild map, raising power by 59 bhp but getting rid of the flat spot the standard car has and the car revs better at the top end. Most of my cars are or were mapped but if you do it sensibly and don't boot the car from a standing start it's usually fine, especially if you also use the best fuel you can get.
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