2001 E39 M5 Worth a remap?

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  1. 2001 E39 M5 Worth a remap? 
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    Hi I was wondering, I keep seeing all these stories that the E39 M5 and other BMW engines around this age are not putting out what they should be. Most cases seem to be around 340bhp for the M5! Is this true or are they horror stories? Coming from a vauxhall combo 1.3 it feels fappin quick to me! If true is it worth a remap? Also on the tuning side if all is well and no remap is needed is it worth chipping for any noticable gains in fuel economy whilst cruising around?
    Any help is greatly appreciated.
     
     

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    DSK
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    I had an M5 thats was donw on power and BMW ended up having to replace the engine under warranty.

    On 1 of my relatives E39 M5's that was taken on a rolling road, it put out 344bhp. No obvious issues and no running faults etc.

    I would say that you must ensure things like engine sensors (even if they seem OK) are replaced as they do make a difference. You need to ensure gasket seals, are tight and not perishing, rubber vacuum hoses are in good order, engine compression etc.

    If the engine itself is all in good health, then any ECU remap work will ensure that you get the maximum benefit from the modification. However, you can accept that if you have a duff engine, or an engine with poor performing service components, you will not receive the benefits of a remap.

    My aunt has her E36 M3 3.2 remapped, it feels sharper and about 15-20% better in terms of the flexibility of the engine and its worth doing as its more cost effective rather than bolt on mods like exhausts and filters.
    Last edited by DSK; 16-04-2009 at 21:15.
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    Leezamonkey (17-04-2009)

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    Ok thanks how much for a remap roughly?
     
     

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    Around15-20 bhp for £500 approx I'd say.
     
     

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    Leezamonkey (18-04-2009)

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