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Thread: bmw e34 m50b25 tuning

  1. #1
    Join Date
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    BMW E34 525i 1992

    bmw e34 m50b25 tuning

    hey. I have an E34 525i with the m50b25. I want to get a little more power out of the engine so I thought that I may buy a schrick 264/256 camshaft, but i was wondering what more do i have to get if so?
    SCH-CS-6Cyl-M.jpg
    Last edited by sondre687; 01-29-2019 at 05:01 PM.

  2. #2
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    11/88 E32 750iL+98 E36M3
    moved to E34 forum
    Shogun tricks and tips for the E32 series are HERE!

  3. #3
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    09/90 E34 525i (M50)
    Quote Originally Posted by sondre687 View Post
    hey. I have an E34 525i with the m50b25. I want to get a little more power out of the engine so I thought that I may buy a schrick 264/256 camshaft, but i was wondering what more do i have to get if so?
    SCH-CS-6Cyl-M.jpg
    m54b30 crank, rods and pistons

  4. #4
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    11/88 E32 750iL+98 E36M3
    when I read about speed limits in Norway https://en.wikipedia.org/wiki/Speed_limits_in_Norway
    I assume you do not want to get more top speed but better acceleration, easiest and cheapest is probably a different final drive ratio. https://diffsonline.com/bmw-e34-525-...l#.XGYydO-P6Uk
    Last edited by shogun; 02-14-2019 at 10:33 PM.
    Shogun tricks and tips for the E32 series are HERE!

  5. #5
    Join Date
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    1970 Bavaria
    So you have a chip? Vanos or nonvanos?
    Quote Originally Posted by e21Terry View Post
    Don't smoke, eat right, exercise, die anyway.

  6. #6
    Join Date
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    '91 525i (5sp)
    Welcome!

    As Shogun said, it depends if your aim is top end or low end speed... I also have an m50b25 (NV), and I've been trying to make it more pleasant for everyday driving and, so far, this has helped quite a bit:

    - As mentioned in a previous post: Chip. The difference is night and day.
    - Big bore throttle body: this one is a bit controversial, but in my case, it definitely improved acceleration. Makes the car feel more "updated".
    - Stainless steel short headers: improved exhaust flow; and even if they didn't, at least they weigh like half than the cast iron manifolds...
    - Lighter rear muffler

    As I mentioned, my aim was to improve acceleration (I know, the car won't win a drag race ), but overall I'm pretty happy with the results. Just my 2 cents!

  7. #7
    Join Date
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    Grand Haven, MI
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    1990 535i 428k miles
    I would do a chip and a new final drive. Chip is a big difference.
    Moderator and Owner of the Subreddit r/E34

  8. #8
    Join Date
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    09/90 E34 525i (M50)
    I've never hear anything good about rechipping the m50, but IRL I only know e36 people (I've only ever seen 2 e34s on the road ever)
    About the only thing a chip could do is advance the timing a bit, but the m50 was pretty advanced from factory (sorry for the pun) and it already needs 95 RON. I'd imagine a chipped m50 would need 98 RON fuel just to be safe (95-96 AKI 'gas'? Is that even a easy to find fuel there and is it pricey like 98 RON here is?)

    What did you two get - some pricey USA tuner chip or some dodgey eastern euro one?

    I know you can get a lot out of a car if the timing is set for lower quality fuels but BMWs aren't. Years ago I had a ford falcon (last of the dizzys model) and I could really advance the timing manually and run it on 95 fuel to make it take off like a rocket. It was faster than the later models that had electronic ignition with no dizzy as and the timing was set back on them so much and you couldn't adjust without a chip.
    Last edited by fo3; 03-01-2019 at 12:57 AM.

  9. #9
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    '91 525i (5sp)
    Quote Originally Posted by fo3 View Post
    What did you two get - some pricey USA tuner chip or some dodgey eastern euro one?
    Canadian, actually...

    Mark D'Sylva chip here, and I've only heard good things about it, also Turner and Dinan, but those are the only reputable ones that come to mind, I don't know if Racing Dynamics makes one for the M50...

    They do recommend "91 or higher" AKI due to the advanced timing, I always get 95 just to be safe. 95 AKI is available everywhere here, I'm sure it's the same in Norway.

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