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Thread: Non costant power

  1. #1
    Join Date
    Nov 2009
    Location
    italy
    Posts
    102
    My Cars
    325i e36

    Non costant power

    Hello, i have m50b25 (2800 cc) 84mm x 84 mm non vanos

    -cr 8:1 wiseco pistons eagle rods
    -aem intank 300 lph fuel pump
    -gt35 turbo exhaust ar .68 intake ar .70
    -525 cc injector
    -kdata megasquirt
    -stock head and cam
    -mls cmetic head gasket with arp head stud
    -boost is 1.25 1.3 bar

    now the trouble:

    i dynoed 530-540 hp first 3 4 dyno with afr 11.5 and egt ok no more than 900 920 c max

    now after 3 4 launch on dyno, without mod ecu i get 420 430 hp, no boost leak

    Has anyone had similar experience?
    Log of parameter is ok, afr is still 11.5-11.6 but get 100 hp less

    I had stock valve on exhaust, can i have trouble with exhaust valve? i need nimonic?

    i am lost

  2. #2
    Join Date
    Jul 2011
    Location
    Bay Area, California
    Posts
    546
    My Cars
    TT Stg II M3 w/Gt35r
    "without mod ecu"

    What does this mean? Also, are you able to log timing?

  3. #3
    Join Date
    Oct 2006
    Location
    Toronto, Canada
    Posts
    3,010
    My Cars
    E36 Turbo
    Quote Originally Posted by leomarcus View Post

    i am lost
    As are we... you didn't provide one single thing that could let us understand what is going on to help you.

    You're basically asking us to guess.

    Post the data log from your dyno runs from start to finish, identifying the ones run with the power loss, and post your dyno sheets along with any other data (AFR, BOOST, etc).

    That would be a start.

    E36 DYNO TUNING WIRING PARTS

  4. #4
    Join Date
    Oct 2016
    Location
    Philadelphia, PA
    Posts
    58
    My Cars
    E36 2JZ
    If it's .68AR on same dyno, same temp day, same gear, same fuel, etc. it's possible the IC heat soaked and your timing was reduced. High intake temps cause me to lose 80hp on summer days too.

  5. #5
    Join Date
    Nov 2009
    Location
    italy
    Posts
    102
    My Cars
    325i e36
    I found little leak in exhaust flange between manifold and turbo but boost is still ok

    - - - Updated - - -

    .ar68 is bad?

  6. #6
    Join Date
    Oct 2016
    Location
    Philadelphia, PA
    Posts
    58
    My Cars
    E36 2JZ
    Not bad for response. It'll run out of steam faster. Just know you'll lose some power up top. Especially on hot days and back to back pulls

  7. #7
    Join Date
    Nov 2009
    Location
    italy
    Posts
    102
    My Cars
    325i e36
    I think is something related to valve train
    Does anyone know if are there common problem relatin to boosted m50 with more than 500 hp?
    Valve..spring...hydraulic lifter cam are all stock

  8. #8
    Join Date
    Nov 2009
    Location
    italy
    Posts
    102
    My Cars
    325i e36
    Found leaks on exhaust manifold but turbo pressure is still 1.2.
    Exhaust manifold leak can lead so much performance?

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