2004 E46 320D Re-Map - should I get a de-map? Feedback please

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  1. 2004 E46 320D Re-Map - should I get a de-map? Feedback please 
    #1
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    Ive never felt the re-map I had has been that satisfactory and i'm thinking of having my 320D E46 de-mapped but before I do this i'd like some feedback.

    Three things have made me think a de-map may be the best way to go.

    1)After having the remap the engine sounds different. Maybe this is just diesel knock, however, it doesnt purr as it used to.

    2)Yes, there is improved acceleration etc.,but it not as good as it was when I used a tuning box. The acceleration is patchy or bitty with a big whoosh when the turbo kicks in. With the tuning box it was very smooth through the gears, the improvement in acceleration was down the line, and better.

    3)The final reason I am considering a demap is that my fuel consumption has gone up substantially. I was averaging about 43.8 mpg but its now gone down to about 39.8 mpg (despite driving economically). This is a reduction in fuel economy of about 10%

    I spoke with the people who did the re-map. Theyve got a good reputation. They double-checked the remap to see if it had loaded amiss which it hadnt. Im thinking about going back to the tuning box.
     
     

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    your engine will prolly thank you for it (a demap) in the future. less destructive torque n stress on the drivetrain and engine components..
    330i sport a big chunk of berlin...

     
     

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    Its up to you-If you're unhappy with the remap then it's definately the right thing to do to go back to its normal map..
     
     

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    where did you get it mapped?

    they'll put the standard map back on for you if you're really unhappy. It doesnt sound that good a map to be honest unless having it has highlighted other issues that went undetected prior to having the extra poke.
     
     

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    The people who did the re-map have a good reputation amongst BMW owners who've remapped with them. I dont know why they are all saying its great.

    Iam especially disappointed with the increase in fuel consumption. Its reduced fuel economy by about 10%. Thats equivalent to an increase in fuel cost of over 10p per litre. That's a heck of an increase. Anyone else seen there fuel economy diminish so much after a re-map. Would like some more feedback on this.
     
     

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    increasing the HP and torque and spinning a turbo harder etc etc is hardly ever gonna improve MPG on most ppls drving styles especially on an urban jungle animal..simple engineering logic..
    330i sport a big chunk of berlin...

     
     

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    not always, a lot of cars are set up to run rich as standard at low revs. leaning the maps out low down and adding more fuel up top can improve MPG.
     
     

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    Sounds to me that the map you had wasnt of all that good quality... It should be just as smooth if not smoother on delivery - or so i've heard anyway. I think you should maybe have a work with Motech Mike, he's a genuine bloke he'll tell you what he thinks of it all...

    Good luck mate.

    2006 E65 730d Sport - 2011 E93 325d Sport Convertible
     
     

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    Quote Originally Posted by Deano16v View Post
    not always, a lot of cars are set up to run rich as standard at low revs. leaning the maps out low down and adding more fuel up top can improve MPG.

    ive yet to see a diesel owner with a remap that dosent hoon it everywhere when the oppertunity arises and has a remap for MPG reasons it all depends on how a car is driven if any mapping is going to be of any MPG benefit....

    by definition a turbo diesel developes its power early in the rev range, hence the high torque characteristics (it has to overcome the resistance and inertia in a limited rev range) of the engine and hence its so easy to map in the first place..

    i sound like a nerd the price of 27 years working on the things.
    330i sport a big chunk of berlin...

     
     

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    Sounds to me that something is bad with the remap, mine is 330 petrol and after remapping the engine is much smoother through lower rev range and i average 31 mpg, not bad for a 6 pot, thought i didnt have an aggresive mapping, just one to smooth out the flat spots.
     
     

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