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Thread: e30 m50 Restoration - Turbocharge or Supercharge?

  1. #1
    Join Date
    Feb 2015
    Location
    Vienna, Austria
    Posts
    2
    My Cars
    1990 BMW e30

    Lightbulb e30 m50 Restoration - Turbocharge or Supercharge?

    Hello guys,

    I have never written anything before here, only read and researched and collected info and you have no idea how helpful you were. So first of all a big thanks to all of you that unknowingly helped me with the restoration of my project.

    So here is a thank you pic:


    IMG_20180627_112951_006.jpg




    The car: e30 1990 316i 2 door.
    The engine: 1990 m50b25 NV out of an e34 with around 70 000 km on the clock.
    The transmission: 5 speed manual ZF.
    The Diff: 3.25 LSD 25%
    Suspension: Bilstein lowered 10 mm front and back (no coilovers since no track days, only weekend car). New thicker sway bar, new poly bushings, front and rear strut bars.
    Steering: e46 330i purple tag steering rack with power steering, e46 inner and e36 outer tie rods, 3 turns lock to lock.
    Brakes:
    290 mm front discs, 4 piston calipers from Wilwood (not sure if you can call it a BBK :P). Stock 250 mm rear brake discs (converted from rear drums and was quite a pain to be honest). Changed all brake lines and complete rear trailing arms and bushings. Brake cylinder from an e32.
    Exhaust
    : Schmiedmann exhaust headers/manifold. Custom made straight piped 3'', cat delete (I know I was going to FI it later so I made a 3'' exhaust from the start).
    Intake: Stock m50 manifold, stock throttle body, K&N air filter kit, new 3'' MAF (although I keep having some minor idling problems :/).
    Cooling: New stock radiator, new water pump, new thermostat, new cooling hoses. Stock clutch fan, never had overheating issues after the changes.
    A/C Delete.
    NEW PAINT, NEW INTERIOR.

    Here are some more pics of the car.
    Old vs new exhaust headers:
    20180220_120855.jpg

    20180220_120859.jpg

    A front view:
    20180822_154127.jpg

    A rear view:
    IMG_20180226_011712_114.jpg

    After the paint:


    Next steps:
    1) New "classic" steering wheel.
    2) Supercharge the engine.

    The reason I think supercharging is in my case a better option than turbocharging is because the car is driven on the street only, during weekends. It spins the wheels sometimes when I am shifting into 3rd with 100 km/h. I do not want that turbo kick when I am on the highway and downshift, I would rather have the linear power of a supercharger.

    My goal is to get around 400 bhp mark. Will that be doable with:
    1) New camshafts.
    2) Rotrex C38 / 81 (with intercooler and oil cooler).
    3) Thicker head gasket to lower compression to around 9.xx:1. (I would really love some suggestions here).
    4) Bigger (500 cc) injectors, new fuel pump (255 l/hr), new tune for 100 Octane fuel.
    5) Subframe reinforcements for the added torque (from Garagistic. They really have some nice stuff).
    6) Stock m50 manifold and throttle body.

    I would love to hear some suggestions from everyone who has had experience with that. I would love to make that process as pain free as possible. :P

    More pics following soon.
    Last edited by Capatiom; 10-04-2018 at 01:11 PM.

  2. #2
    Join Date
    Feb 2015
    Location
    Vienna, Austria
    Posts
    2
    My Cars
    1990 BMW e30

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