1998 E36 328 re-build

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  1. 1998 E36 328 re-build 
    #1
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    beeemerfanatic's Car Details
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    just a quickie, im in the middle of a 328 rebuild, the finishing spec will be as follows.,feb 97 loom & ecu, 540 throttle bodie custom fabricated onto m52 manifold,polished head, us m3 s50 cams, m50 block, new rings, 3.2 evo exaust manifold system, really lightend and balenced flywheel,new crank shells, 320 gearbox, m3 diff. what sorta bhp you reakon we are talking people???
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    cheap 328/m3 parts wanted!!!!
     
     

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    250bhp as a guess.Have you had it mapped too? Will be interesting to see what you do get.
     
     

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    Surely you'd want the larger throttle body on an M50 manifold, not the more restrictive M52?
    "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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    B33M3R20's Car Details
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    Fair play mate sounds good.
    ///E36 328TImanual Quarter mile 14.1secs@99.20mph

    ///E30 325ISE coupe 1990 auto OLD SCHOOL

    ///E30 316i Touring 1994 manual WORK HORSE
     
     

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    Quote Originally Posted by mikaveli View Post
    Surely you'd want the larger throttle body on an M50 manifold, not the more restrictive M52?
    Ditto, sticking the freer flowing M50 manifold on the M52 gets you a reasonable power boost. Thought I heard 20bhp being mentioned before, not sure how realistic that is mind.
     
     

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    Quote Originally Posted by matt328 View Post
    Ditto, sticking the freer flowing M50 manifold on the M52 gets you a reasonable power boost. Thought I heard 20bhp being mentioned before, not sure how realistic that is mind.
    On a standard M52, single vanos the throttle body with an M50 manifold sees between 20 - 25 bhp at the top end, and makes the revs above 5300 rpm much easier.

    However, just like fitting bigger carbs to a bike, this comes at the expense of lower end power. Below 3700ish rpm, I've seen dynos that lose up to 10 bhp, then above 4000rpm, seeing significant gains. Adding 'hot' cams amplifies this effect - US M3 cams add another 8ish to the top, and take away a few lower down.

    A decent CAI adds around 5bhp to the top, without affecting low end too.

    Getting a decent remap/chip to suit the above mods can claw back around 5bhp low down, improve torque and add 12ish up top too.

    All in, you're looking at 235 - 240 bhp at the crank. Ditch the cams and the low rpm loss should be reduced to just 2-3 bhp (with the chip) but your top power would then be more like 230bhp.

    It's just a case of honestly answering how much time you really spend above 4000rpm as to whether the mod is good for you - or if you prefer the stock lazy torque.
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  9. The Following 2 Users Say Thank You to mikaveli For This Useful Post:

    Ian S (01-02-2010),matt328 (31-01-2010)

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    Good post

    The only thing I would add to it, is IIRC rather than losing torque isn't it more a case of moving peak torque higher up?

    My thoughts on the matter is if the M50 manifold is fitted to the smaller 325, it should be ok torque wise on the 328.

    Ian
     
     

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    Quote Originally Posted by Ian S View Post
    Good post

    The only thing I would add to it, is IIRC rather than losing torque isn't it more a case of moving peak torque higher up?

    My thoughts on the matter is if the M50 manifold is fitted to the smaller 325, it should be ok torque wise on the 328.

    Ian
    That's correct. No torque is lost, it just moves up the rev band by 250rpm.
     
     

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    Quote Originally Posted by beeemerfanatic View Post
    just a quickie, im in the middle of a 328 rebuild, the finishing spec will be as follows.,feb 97 loom & ecu, 540 throttle bodie custom fabricated onto m52 manifold,polished head, us m3 s50 cams, m50 block, new rings, 3.2 evo exaust manifold system, really lightend and balenced flywheel,new crank shells, 320 gearbox, m3 diff. what sorta bhp you reakon we are talking people???
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    maksimus by m52 lightend flywheel -2kg, then the weight will be 11 max 10kg, put m20 flywheel, weighs 6.3kg which can lightend to 4kg, but it is not necessary. I would still recommend to order m54b30 crankshaft and S50b30 inflow, if so such a large scale project
     
     

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    #10
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    Quote Originally Posted by matt328 View Post
    Ditto, sticking the freer flowing M50 manifold on the M52 gets you a reasonable power boost. Thought I heard 20bhp being mentioned before, not sure how realistic that is mind.
    ive chopped the throttle side box section of the mannifold off, im going to custom make a bigger inlet box with 6 sleeves to slot on wots left of the rest of the manifold, and on the other side make the 540 tb, fit. different i know but theres just under a inch difference in airflow between the 540tb and the m50tb.
    cheap 328/m3 parts wanted!!!!
     
     

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