1993 E36 325i, i want more torque and quicker revs???

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  1. 1993 E36 325i, i want more torque and quicker revs??? 
    #1
    BMW Master
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    danzo's Car Details
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    hi everyone,

    my 325i is feeling pretty slow now i been driving it a while.

    most my power is 3000rpm upwards, so how can i make my 325i rev quicker and get upto the 3000rpm quicker???

    maybe lightened flywheel?? auto rear diff??

    and how can i get more torque so it feels better low down??

    dan.
    out with the M3 evo............ on with next project.......325i coupe
     
     

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    #2
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    izzy_007's Car Details
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    firstly when was it last serviced, if its been a year or 7000miles or so then i would do a full oil and if required spark plug service, change the air filter aswell.
     
     

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    #3
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    It is an old school engine, and part of it is just the way they are. The newer M52s had the manifold done to change the shape of the torque curve, making it bigger lower down, but killing it off higher up the revs.

    A lightened flywheel or a different diff will help, but they can be pretty expensive.
    I have a feeling the auto 325 diff was a 3.15 anyway, leaving your only options swapping to a 320 3.45 diff, but that means driveshafts too as it's a smaller diff, or a complete evo rear axle which will get you 3.23 and an LSD, and also M3 rear brakes, but again, thats not cheap, although good value all in all...
     
     

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    #4
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    i serviced the car only a month ago so all good on that front.

    iv also had my fault codes read and has flagged up nothing wrong!

    can i not put a manifold from a m52 to help my torque??

    im not bothered about top end at all, i would be happy to have a max speed of 100mph, i just want a quicker acceleration and bit more torque below 3000rpm if i can........

    iv read about lowering the compression, what does this achieve?? is it worth it and can it be done to a standard engine??

    only mod i have is a cat back stainless exhaust so far.
    out with the M3 evo............ on with next project.......325i coupe
     
     

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    Lowering the compression will lose you power so that is no good unless you are adding a turbo.

    The M52 manifold on an M50... I don't think anyone has tried that, you should gain a little more torque at low speeds, but lose 25-ish BHP from the top
     
     

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    #6
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    The m52 manifold won't give you any more torque at all, it will just lower the peak torque down the rev band by 250rpm
     
     

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    #7
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    would the m3 evo 6speed box fit???
    6speed would allow me to rev up the rev range alot quicker wouldnt it??

    the 320i auto diff was mentioned, how much of an improvment with quicker acceleration would it realistically make??
    out with the M3 evo............ on with next project.......325i coupe
     
     

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    Surely it'll be easier to sell the 325 and get a 328 then it'll be what you want.You'll have low down torque but virtually identical power to the 325 It'll also stop you from devalueing your 325 by the mods you are talking about too
     
     

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    The 6 speed box just adds an overdrive for 6th gear, so not much to gain there.
     
     

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    Quote Originally Posted by danzo View Post
    would the m3 evo 6speed box fit???
    6speed would allow me to rev up the rev range alot quicker wouldnt it??

    the 320i auto diff was mentioned, how much of an improvment with quicker acceleration would it realistically make??
    325's already have a 3.15 ratio diff and lower (than a 328) ratio gearbox.

    All E36 6 cylinder gearboxes have a 5th gear ratio of 1.00, the Evo's 6th gear is 0.83. The first 5 gears are almost identical ratios between the 325 and M3 Evo - so no real benefit there.

    328's and M3 3.0's have slightly taller gearboxes, but more power than a 325 obviously.

    The 320's diffs are about 3.38 to 3.45 IIRC, but I wouldn't recommend it - the 325 is a very well thought out setup.

    As StK says, maybe buying a 328 would be the better option. A 325 (or M3) diff on one of them is a great mod - and the engines are easily tunable to 225-230bhp.
    "So give me one more platinum plaque and rap, you can have it back." - Dr Dre

    Spinnin' on digital 22's!
     
     

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