M50 Manifold slower ?

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  1. M50 Manifold slower ? 
    #1
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    Hey guys i recently installed a M50 manifold on my 528i and this has made my car slower then it was before. I have lost so much low end power something i wasnt expecting i dont feel any power until i get to about 5000rpm then it pulls like a train it feels like i have a bad case of turbo lag. Dose anyone know what the problem is do i have a vacuum leak or do i just have to tune my car?
     
     

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    you need to have it remapped to get the full benefit
    as your ECU still thinks you have the old one on
     
     

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    That can be normal, as you lose a "supercharging" effect from the tight manifold.

    The thin runners on the original manifold are done to boost intake gas velocities and this helps packing the air in at low speeds. At higher RPMs, it starts holding the car back.

    Now your car is performing more naturally, but you've lost the bonus effects of the M52 manifold.

    Tuning/remapping will give you back most of this power, but it isn't from "fixing" the situation, you'd get a similar increase on an M52 manifold car, but it'll boost it back to stock or above levels again.
     
     

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    Sounds like you have a vacuum leak. There should be absolutely no loss of torque at low revs. It just moves the torque curve up the rev band by 250rpm.
     
     

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    M52 Manifold in red, M50 in black
     
     

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    i think i know whats happening i do feel that rush of power at 5000rpm but the low end does feel like its lacking is it maybe because i have the 528i and its alot heavier then the 328i so it has more trouble taking off ?
     
     

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    It's possible.

    You won't see any check engine lights, so you need to check fault codes manually. INPA is your best bet. If you have an airleak you should see some lambda codes (don't immediately change the sensors!) and keep an out out for anything else like cam sensors which can make a car feel flat.
     
     

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    We have found not all 2.8i after the m50 manifold mod loose loads of torque
    It's down to what level of software is on the Ecu

    Here's a 328i dyno with just the m50 manifold fitted updated software and our remap made on the dyno

    It made 209 bhp with software update and m50 fitted

    239 bhp with our remap after
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