1997 E39 540i - best performance mod to do? - Page 2

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    #11
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    mark beardmore's Car Details
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    do you mean decat or silencer removal? as nether are illegal in the uk as long as the car passes the emissions test at mot time and the vehicle is not deemed exessively loud!
     
     

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    #12
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    I'm a bit disappointed at those remap figures for the 540i .. only 17 more bhp to 300!! hardly worth it .. I have an astra turbo diesel and I go from 150bhp to 210bhp with a remap! ..

    Oh I got the 540 servced .. hopefully that'll help! ..

    does no one know how to get another 50 to 100 bhp from a 4.4 litre? I'm sure its possible .. ANY suggestions welcome .. it'll help me start figuring out my options. of course theres the costly turbo or supercharge ...
     
     

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    #13
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    I'd go for the remap and CAI. And a sport exhaust, maybe decat, or with sport cats. you might get some decent numbers out of these. and if you wanna step it up a bit, you could go for some hot cams, but i'm afraid those wont be cheap.
    There are only two products required to make the universe work properly: Duct tape and WD40. 


    If it moves (and it shouldn't): duct tape. 
If it doesn’t move (and it should): WD40.

    Everything else is just stuff.
     
     

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    #14
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    Nitrous.

    Turn it off 99% of the time......then when needed. Instantanious ooomph.
     
     

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    #15
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    what about the air intake mods ?
     
     

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    #16
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    OK, so if I put a cold air intake, a remap, decat and some manifold mods, how much gain do you think I'd get?
     
     

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    #17
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    If you want big bhp you need to supercharge it.

    And in the real world, you will not achieve 17bhp from a remap, you'd be lucky to see 7bhp (regardless what anyone tells you). You're engine is without VANOS as well, so there's even less you can do with it. Remaps are best on turbocharged cars, even better on diesels as they can usually handle the extra boost without major issues, N/A cars will see no real gain, N/A engines with variable valve timing may see something, but still not worth the money.

    Dont start messing with the intake, as all that might happen is an increase in noise and a loss of 2-3bhp.

    decatting this car will mess with the back pressure, it'll give you a nice noise but with no noticeable gain. removing the rear cans and the 2 secondary cats you can get away with, but anymore then that and you risk being illegal.

    Manifold might be an idea, but then again the standard bmw one is stainless steel as far as i know, and has good breathing characteristics.

    Choice is yours!
     
     

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    #18
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    hey adam, thanks for that .. i notice you have an almost identical car to mine .. have you done any mods .. or can you make any recommendations .. i have a few things to fix but really only want it as an occasional drift car .. the wife drives it. do you think i should change the gearbox oil to prevent failure in the next few years? .. oh, and someone told me that if i change my rims then tyres wont cost so much! .. any ideas?

    porschester
     
     

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    #19
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    If the gearbox isn't acting funny then dont bother. I changed the oil on mine twice and its made no difference whatsoever, but at least its a piece of mind.

    I got some HELLA headlights and tail lights (quite expensive) but apart from those... no mods.

    Yes you can get different rims, i think 15/16" rims will be a comfortable ride and your tyres will be cheaper. I'm on 17's at the moment running 235/45/17 and for a decent tyre its £100 a piece... sucks to be me!
     
     

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    #20
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    thanks for the advice, i've read a small bit about gearbox failure and that at least 1 change at 90,000 would help .. it may then last to 200,000miles! .. does this make any sense?

    at what mileage did you change yours?

    Edit .....

    Heres the article I found .. any comments on this? You think he makes sense?

    "
    It is risky to drain a previously un-maintained automatic transmission with high mileage,
    even though if it were my car I would probably chance it. Still, I have seen it happen too
    many times, where a well-meaning owner or technician performs an ATF and filter
    service on a neglected but well-shifting automatic, and then all of the sudden it starts
    slipping. I can’t explain it, but my feeling is the fresh ATF flushes a bit of sludge from a
    place where it was doing no harm to a place where it does do harm. Overfilling,
    underfilling, and cleanliness are also issues in ATF and filter servicing, but these should
    not be problematic for a professional BMW technician, dealer or independent.

    BMW has backed off their lifetime fill mantra for automatic transmissions, currently
    recommending an ATF and filter change every 100,000 miles.
    "
     
     

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