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Thread: M50B25 Turbo questions

  1. #1
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    M50B25 Turbo questions

    Got some question about boosting my M50B25.
    Found some wiseco pistons, but didn't found some good company rods, will glad to hear some options.
    Also need recommendation about chose for engine bearings and clutch.

    Using the car for drifting and small daily driving.

    https://youtu.be/0kUrzLrjNAQ?t=161

  2. #2
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    How much power are you looking to make? The rods and bearings that are already in it are fine if they are still in good shape. I’ve made at least 800 whp on stock m50 rods and I’ve never seen a rod or main bearing failure. The oem bearings are great.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  3. #3
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    Want top number of 400-550whp, looking for more low rpm toruqe.
    The car will work hard, most of the time out drifting so i need the maximum reliable option, going to rebulit the all engine.

    Didn't found any familiar company to buy rods, about the clutch, thought about getting 240 m'''m flywheel, what clutch should i looking for?
    Important thing, needs to be regular left foot felling on the clutch

  4. #4
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    I'm not an expert, but from what I've found out so far (thread just next to yours) stock rods should do. Eagle rods are haveing a very good opinion, like 1000+?
    As for the clutch, I don't know how about Israel, but where I am th easiest is to get M50B20 SMF + M57 pressure plate and custom kevlar friction plate.

  5. #5
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    Hey guys, started to buy parts for my turbo project.
    Bought RSI mani and tial wastegate, planing to order the BorgWarner S257 turbo.

    Wondering about camshafts, found some S50US camshafts that i can buy for a good price.
    Someone have experience with them?
    Last edited by JEPO; 08-11-2019 at 01:25 PM.

  6. #6
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    Quote Originally Posted by someguy2800 View Post
    How much power are you looking to make? The rods and bearings that are already in it are fine if they are still in good shape. I’ve made at least 800 whp on stock m50 rods and I’ve never seen a rod or main bearing failure. The oem bearings are great.
    NV rods or normal M50 rods?

    - - - Updated - - -

    Quote Originally Posted by JEPO View Post
    Hey guys, started to buy parts for my turbo project.
    Bought RSI mani and tial wastegate, planing to order the BorgWarner S257 turbo.

    Wondering about camshafts, found some S50US camshafts that i can buy for a good price.
    Someone have experience with them?
    Awesome! BW S257 is a great turbo, and for the price you can't beat it.

    S50 cams are great, great upgrade over the stock M50 camshafts.
    "Be who you are and say what you feel because those who mind don't matter and those who matter don't mind."
    -Dr. Seuss
    DIY BMW Tools. Charlie For President

  7. #7
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    Have the same question about the rods, how much the 'normal' vanos rods will hold?

  8. #8
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    Quote Originally Posted by Hova View Post
    NV rods or normal M50 rods?
    Non vanos but the vanos rods are basically identical other than being 140mm


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  9. #9
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    Quote Originally Posted by someguy2800 View Post
    Non vanos but the vanos rods are basically identical other than being 140mm
    Roger. For some reason I thought the NV rods where beefier, but I actually ran across your previous thread that shows them laid out.
    For those interested:
    https://www.bimmerforums.com/forum/s...rod-comparison

    Thanks for sharing that btw. Those things are going to be tough to bend.
    "Be who you are and say what you feel because those who mind don't matter and those who matter don't mind."
    -Dr. Seuss
    DIY BMW Tools. Charlie For President

  10. #10
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    With all that talking about stock internals, thought about this setup:
    My engine have 213,000km on it, runing good and strong for m50 stock.
    CES curting HG with copper spacer and ARP stud kit, stock camshafts, injectors (?), rsi manifold, S257SXE borgwarner, got the vems PNP for m50TU.
    Runing on 98 octane fuel, what's you'r opinion? Most of the time the car will drift, looking for 400-450whp, What's you'r opinion, will be reliable enough?

  11. #11
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    60 lbs Injectors should be more than enough, I would suggest going with an upgraded oil pump shaft as well since you'll be on rev limiter most of the time. I'm currently running this shaft kit and I had them press the rotor on the shaft for me quick and easy install other than that. Your set up sounds pretty capable of reaching the numbers you want no problem given the fuel your running.

    https://www.achillesmotorsports.com/...1-am-uopsk.htm

  12. #12
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    Quote Originally Posted by JEPO View Post
    With all that talking about stock internals, thought about this setup:
    My engine have 213,000km on it, runing good and strong for m50 stock.
    CES curting HG with copper spacer and ARP stud kit, stock camshafts, injectors (?), rsi manifold, S257SXE borgwarner, got the vems PNP for m50TU.
    Runing on 98 octane fuel, what's you'r opinion? Most of the time the car will drift, looking for 400-450whp, What's you'r opinion, will be reliable enough?
    Since you are drifting I would put a water/methanol kit on it just to keep the temps in check, but otherwise should not be an issue.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  13. #13
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    What about boosting with the stock camshafts? Also, need advice about the injectors, what size and what brand.
    Thank you.

  14. #14
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    I would run stock cams unless you can find a good set of m3 cams as a cheap upgrade.

    I linked a set of Siemens Deka 60lb injectors down below. Just as someguy mentioned above water/meth kit would be great too.

    http://www.22rpd.com/item.php?item=45

  15. #15
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    You running similar setup on you'r car? Will glad to hear to details and numbers.
    Gotcha with the meth kit, will check about that.

    The Siemens Deka will fill fit the original rail or should i custom it? (any way going to custom the rail to run AN hoses)
    Thanks guys.

  16. #16
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    The siemens deka will fit in the stock rail. You might want to get the 80 lb ones as they are similar price and will give you some more head room in the future. The stock cams will work, US M3 cams are a big improvement by hard to find outside of the US. A good cheap upgrade is to use an M54B30 intake cam, and a non vanos M50 cam in the exhaust side of the head. This requires a little modification to both cams but they work well and are cheap. I can sell you tools to time the cams properly if you like as well.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  17. #17
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    About the injectors i will think, my tuner recommended the Injectors Dynamics, but the price is not very cheap
    The S50US camshafts will fit m50 no problem? Here some pictures of them, like i understand there is no part number.
    WhatsApp Image 2019-08-13 at 18.50.59(1).jpegWhatsApp Image 2019-08-13 at 18.50.59.jpegWhatsApp Image 2019-08-13 at 19.57.32(1).jpegWhatsApp Image 2019-08-13 at 19.57.32.jpeg
    Attached Images Attached Images
    Last edited by JEPO; 08-16-2019 at 08:52 AM.

  18. #18
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    My S50 cams had weird numbers on them as well. Can you send side profile pictures of the cam lobes?

    Also you can measure the lobes and determine the lift, you can tell if they are S50 or M50 cams by that.

    Yes S50 cams will fit in an M50 without a problem. Be very careful installing them. They are easy to break.

    I hand tighten all of the nuts as evenly as possibly, with the front lobes facing slightly down and towards each other, go in a criss cross pattern up and down the entire tray 1/4 at a time.
    "Be who you are and say what you feel because those who mind don't matter and those who matter don't mind."
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  19. #19
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    I think it is the 96-99 cams that don’t fit the 92-95 cam trays without modification to the early trays (96-99 trays fit 92-99 cams). I have not done the modification myself, but my understanding is that a little clearancing is needed somewhere near the front of the tray. I would assume the M54 3.0L intake cam would be like the 96-99 M52/S52 cams in terms of the fit to 92-95 cam trays.

  20. #20
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    Some changes in the plan, Some updates,
    Bought some new parts.

    S50US camshafts, Athena 84.5 HG, Wiseco 84 mm pistons, FCP 140mm rods, S257 BW turbo, RSI manifold, 1050X ID injectors, Rallyroad Oil cap to connect oil cooler.
    Need recommendation for Fuel pump, Catch can, Oil cooler. About the head, going to make some porting, parts recommended to change before installation?

    Also, want to connect to my ECU (VEMS PNP) oil temperature and pressure sensors, should i install those in the oil cap? Have only one place to put and sensor.
    Last edited by JEPO; 09-23-2019 at 10:16 AM.

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