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Thread: M50b25 stock intake manifold and throttle

  1. #1
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    M50b25 stock intake manifold and throttle

    Hello do you know how much hp can handle
    Stock intake manifold and throttle valve?
    I get 530 hp changed camshaft exhaust ar etc but seems there is something lock power around 530 hp and i thought was intake or throttle
    Thank you

  2. #2
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    Quote Originally Posted by leomarcus View Post
    Hello do you know how much hp can handle
    Stock intake manifold and throttle valve?
    I get 530 hp changed camshaft exhaust ar etc but seems there is something lock power around 530 hp and i thought was intake or throttle
    Thank you
    I made 1000whp on a m50 intake and stock throttle body.

    Turbo sizing and tune.


    Sent from my iPhone using Tapatalk
    1989 535i - sold
    1999 Tiag/Dove M3 - sold
    1998 Turbo Arctic/black - current
    2004 TiAg/Black - Current

    PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53

  3. #3
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    Gt35 t4 flanged exhaust ar .82
    Compressor Wheel61.3 /82 mmTurbine Wheel62 /67.8 mm

  4. #4
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    Quote Originally Posted by leomarcus View Post
    Gt35 t4 flanged exhaust ar .82
    Compressor Wheel61.3 /82 mmTurbine Wheel62 /67.8 mm
    Ok what do you have for a tune?

    What cams?

    What fuel/compression? Boost?

    Post a dyno graph? If itís a standalone whatís your vanos setup?




    Sent from my iPhone using Tapatalk
    1989 535i - sold
    1999 Tiag/Dove M3 - sold
    1998 Turbo Arctic/black - current
    2004 TiAg/Black - Current

    PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53

  5. #5
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    Log

    Hello

    Cam are catcams for turbo conversion
    270/250
    Fuel is ron 95

    Here log
    https://youtu.be/DtURfXHwmPM

    Stock intake manifold and throttle body

    Now i get about 530 hp and 670 nm

    Ps lifter are hydraulic

  6. #6
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    What happens if you raise the boost? i think 530hp is plenty for just 1,3 bar of boost.

    Whats the compression? i could imagine it would start to knock somewhere around that power level on pump fuel. what does your exhaust system and exh. mani look like?

  7. #7
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    Here Ť uno graph as yu can see something
    Happen at 5500 rpm20181228_100153.jpg20181228_100153.jpg

  8. #8
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    Looks like its breaking up or there is a valve control problem.


    86 325es, 2.8L m50, S472sxe, MS3pro Ultimate, e85, solid rear axle, 4 link, spool, TH400 trans, Protorque converter, 28x10.5w slicks, zip ties
    Best = 9.43 @ 149.15 mph, 1.30 60 foot 28 psi boost

  9. #9
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    Hello
    I am sorry what do you mean breaking up or valve control?

    - - - Updated - - -

    I have cat cams for turbo conversion 270 250 with stock head and stock hydro lifter and stock valve.

  10. #10
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    What's the clutch setup in the car? Do you have a log file of the pull?

  11. #11
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    Hello in link Youtube in previous post you can see log
    I use f1 Cooper clutch.
    Engine has eagle rods and wiseco piston
    Cr is 8:1

  12. #12
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    Quote Originally Posted by leomarcus View Post
    Hello
    I am sorry what do you mean breaking up or valve control?

    - - - Updated - - -

    I have cat cams for turbo conversion 270 250 with stock head and stock hydro lifter and stock valve.
    I mean it looks like its missfiring above 5000 rpms or the valves are floating due to not enough spring pressure. What is the spark plug gap? It could also be slipping the clutch or spinning the tires.
    Last edited by someguy2800; 12-29-2018 at 08:40 AM.


    86 325es, 2.8L m50, S472sxe, MS3pro Ultimate, e85, solid rear axle, 4 link, spool, TH400 trans, Protorque converter, 28x10.5w slicks, zip ties
    Best = 9.43 @ 149.15 mph, 1.30 60 foot 28 psi boost

  13. #13
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    hello
    Is common problem valve float on m50 turboed?

    On rpm gauge i not see strange rpm jump usual when clutch slip.
    same for tires...when it slip i feel big black smoke but i not feel it
    spark gapped at 0.4 mm but on afr log i not see strange behavior of afr.
    what yu can see on video i posted boost has little fluctuation

  14. #14
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    Quote Originally Posted by leomarcus View Post
    hello
    Is common problem valve float on m50 turboed?

    On rpm gauge i not see strange rpm jump usual when clutch slip.
    same for tires...when it slip i feel big black smoke but i not feel it
    spark gapped at 0.4 mm but on afr log i not see strange behavior of afr.
    what yu can see on video i posted boost has little fluctuation
    Is it a vanos or non vanos cylinder head? I can't really tell much from your video but I do see the AFR and pulse width fluctuating slightly. I also noticed that the torque drops off sharply at 5200 rpm on the graph but the log shows the pulse width is still increasing till nearly 6000 rpms. Something is not quite right there. I think I would try a different set of coils, boots, and spark plugs


    86 325es, 2.8L m50, S472sxe, MS3pro Ultimate, e85, solid rear axle, 4 link, spool, TH400 trans, Protorque converter, 28x10.5w slicks, zip ties
    Best = 9.43 @ 149.15 mph, 1.30 60 foot 28 psi boost

  15. #15
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    engine is non vanos
    but i have bought used head on ebay
    i do not know how check if from vanos or not engine

    - - - Updated - - -

    is useful play dwell?

    - - - Updated - - -

    dyno is lps2510 cartec rated for 400 kw

  16. #16
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    Non vanos heads have double valve springs and vanos heads have single springs. If you do have a vanos head the cams you have might be too aggressive for the single valve springs. I think that’s unlikely the problem but it’s a possibility so I wanted to mention it.

    What dwell are you using now. The stock coils work best with about 4.5ms dwell while in boost


    86 325es, 2.8L m50, S472sxe, MS3pro Ultimate, e85, solid rear axle, 4 link, spool, TH400 trans, Protorque converter, 28x10.5w slicks, zip ties
    Best = 9.43 @ 149.15 mph, 1.30 60 foot 28 psi boost

  17. #17
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    i open valve cover and check.
    dwell is 2.5 or 2.7 as i remember i check also

    - - - Updated - - -

    ps dropping down of power was present also with stock cam

  18. #18
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    hello i checked and

    i see 2 spring one inside other
    dwell is fixed at 2.7 mm and spark
    duration 0.9

    i attach screenshot and photos

  19. #19
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  20. #20
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  21. #21
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  22. #22
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    how many mm do you sugfest for gapping plugs?

  23. #23
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    between .4 and .5 mm


    86 325es, 2.8L m50, S472sxe, MS3pro Ultimate, e85, solid rear axle, 4 link, spool, TH400 trans, Protorque converter, 28x10.5w slicks, zip ties
    Best = 9.43 @ 149.15 mph, 1.30 60 foot 28 psi boost

  24. #24
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    what do you think about spring and dwell?

  25. #25
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    Springs are fine. Try using a dwell table with 2.5ms at 100 kpa and under and 4.5 ms at over 100 kpa


    86 325es, 2.8L m50, S472sxe, MS3pro Ultimate, e85, solid rear axle, 4 link, spool, TH400 trans, Protorque converter, 28x10.5w slicks, zip ties
    Best = 9.43 @ 149.15 mph, 1.30 60 foot 28 psi boost

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