E36 328i + M3 exhaust manifolds.What gains?

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  1. E36 328i + M3 exhaust manifolds.What gains? 
    #1
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    Artur Costa's Car Details
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    Hi,

    I was searching the forum but couldnt find anything about it.
    My 28i already has the M50 manifold that I read gains more less 20hp with it.
    In my garage I already have the M3 manifolds and I have seen the difference it makes on a M50 engine but what will it do on the M52?

    Anyone here ever tested that ? On dyno it would be even better

    Regards,
    Artur Costa
     
     

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    The m3 manifold is about the best you can fit to a m50/52 engine.
    Good for 10+ hp.
     
     

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    Something I'm going to be doing on mine as I have the full system with manifolds to go on my 328 from an M3 Evo- you need the 3.2 Evo manifold due to the lamba sensors being situated in the same place. I think what ever gains that can be had will be lost by the added weight of the system over the M52 engine. I think lined it with lead it is so damn heavy.
     
     

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    More weight? The manifolds or all the exhaust system?
    Im going to intall the manifolds and do a costum exhaust system with no cats and a X-pipe. Probably going to use only one rear muffler , so it will weight less then stock system.
    Still 10hp more is a very good number.

    I hope I can document with dynos all this mods I will do.

    In the M50 the manifolds feel like 20hp more... never did a dyno on a friends car but it feels a lot faster and engine sound is a lot better too.
    Artur Costa
     
     

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    I don't think you will see much gain at all with the M3 manifolds. Perhaps 1 or 2 bhp. Certainly not 10bhp. It will be interesting to see it on a dyno though
     
     

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    1 to 2 hp that would be very bad to see.. still on the M50 if felt a lot more then 2hp.

    I have 3 to 4 dynos in a 20km area from my home so I hope I can have dynos of all engine mods

    Is there on this forum any 28i with moded cams etc?
    Artur Costa
     
     

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    RS250nut has done this mod, it is a ball ache to do, I will PM him a link to this thread.
     
     

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    Quote Originally Posted by Artur Costa View Post
    1 to 2 hp that would be very bad to see.. still on the M50 if felt a lot more then 2hp.

    I have 3 to 4 dynos in a 20km area from my home so I hope I can have dynos of all engine mods

    Is there on this forum any 28i with moded cams etc?
    US 3.0 cams give about 8bhp, the 3.2 cams give around 10bhp
     
     

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    The dual vanos on the 3.2 M3 is there for a purpose. You cannot expect to bolt on the M3 manifolds and full exhaust system on the M52 and realise any significant gains at all.

    The M52, being a single vanos engine only controls the intake camshaft. Ideally you would want the outlet camshaft to be controlled in order to maximise the timing and reduce valve overlap.

    I do agree this swap on the M52 will sound awesome though.
     
     

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    [QUOTE=anees;862189]The dual vanos on the 3.2 M3 is there for a purpose. You cannot expect to bolt on the M3 manifolds and full exhaust system on the M52 and realise any significant gains at all.

    Of course you can, have you looked at the original manifolds on the 325/328? Very crude log type manifolds with rubbish joints to the flanges which won't help with reversion. The m3 manifolds are a lot better design with pressed on flanges with no intrusive welds, have a proper 3-1 design with a decent collector. I'm not saying your going to set the world on fire with these but I bet there will be a healthy gain, also it's not always about peak figures, I'm more interested in the space under the graph.

    I do agree this swap on the M52 will sound awesome though.

    It does sound amazing, when you lose the added weigh of the rear box by gutting it and replacing with a straight perforated tube.

    Last edited by rs250nut; 09-11-2011 at 00:42.
     
     

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