2003 E46 330d - Risks following remap?

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  1. 2003 E46 330d - Risks following remap? 
    #1
    nsi
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    Hi,

    I bought my E46 with 120k miles in November. The turbo failed at 130k and it is in the process of being refurbed to refit. I'm also cleaning a load of stuff out and fitting new breather etc as well as new filters etc and removing swirl flaps. I'm also taking the oppertunity to make some improvements, like fitting a decat instead of the standard downpipe/cat pipe thing.

    So I'm thinking about getting the car remapped once all this has been done, but I wanted to find out some more about the risks of remapping a high milage car.

    Now, the turbo will have been overhauled, the new breather on and swirls deleted, plus the decat. However the engine is pretty high miles now. So what risks are there? What might go wrong after the remap? How can I mitigate the risks?

    All advice welcome, particularly from tuners providing this service.
    Cheers,
    nsi
     
     

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    There isn't much you can do, you have done the important bits already.

    There has been some cases of the intake manifold exploding, but it seems to have been related to a manufacturing problem as they did turn up more commonly 5-6 years ago, and have been very rare since.
    It looks like they had been prone to developing a crack which first off shows itself as a lack of power and a boost leak, and if left un-noticed, it can lead to the intake manifols tearing itself to bits.
    As I have said though, the majority of these seemed to occur fairly early in the car's history, suggesting that they might have left the factory with a weak manifold, and if it has survived so far, it is a strong one.

    Taking a look at the turbo, you'll see that some cars will carry on to 200k on the original, some will fail earlier. You may need to think of them as a wear item with a similar lifespan to a clutch for example.
    Some may last 100k, some may last 200k.

    Removing swirl flaps and a new breather would be the only preventative maintenance I would consider as an absolute must.
     
     

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    Quote Originally Posted by TheEnd View Post
    Removing swirl flaps and a new breather would be the only preventative maintenance I would consider as an absolute must.
    Ok, good stuff. I reckon I'll run the new turbo in for a couple of months to make sure there's no bedding in problems or anything, and then get a remap after that.

    nsi
     
     

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    Yep, i've seen a few cases of recon seals not seating perfectly and leaking a bit of oil, but once you have some miles on it, and it's still OK, you've got the green light.
     
     

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    Remapping high milage cars can cause pipes and engine parts to wear out as they are already old and seen many miles after a remap they come under more stress which can cause them to wear faster more common with pipes but then again can be seen as wear and tear.
     
     

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    Which pipes in particular?
    nsi
     
     

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