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Thread: someone please give advice

  1. #1
    Join Date
    Jun 2006
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    Default someone please give advice

    i have a 1989 535i and i recently installed the performance head from metric mechanic i do alot of street racing i i run against some fast cars and win by a few car lenghts but yesterday i took my car to new england dragway and i coulndn't get no better time then a 16.2 but the guys that i street race with where getting time of 14.8 i want to know y i wasen't no where near there time if my car is faster then thiers

  2. #2
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    Mar 2005
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    Is your car an auto? If so, thats about the times you should be getting stock. These cars are not made for street racing/off the line acceleration. You should buy an old american V8 muscle car.
    Lowered with blue h&r(?) springs, Bilsteins, tint, 19# design 3 injectors, Dual Magnaflow
    southwest WA

  3. #3
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    Quote Originally Posted by Alexlind123
    Is your car an auto? If so, thats about the times you should be getting stock. These cars are not made for street racing/off the line acceleration. You should buy an old american V8 muscle car.

    no my car is a manual with a 3.91 diff

  4. #4
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    Default

    do a dyno run and see what your torque curve looks like, there could be something interfering with proper engine operation.

  5. #5
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    Jun 2006
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    Quote Originally Posted by BillionPa
    do a dyno run and see what your torque curve looks like, there could be something interfering with proper engine operation.

    what kind of things are we talking about that can be interfering i'm thinking of now putting in bigger injector and a adjustable fuel pressure regulator maybe this will help

  6. #6
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    May 2006
    Location
    Perth Western Australia
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    Hmm........... You sound like a troll.....
    Answer these questions for me and I'll be able to help:

    1. what cam are you running?

    2. what chip are you running?

    3. what rpm are you shifting at?

    4. why would you put in an adjustable reg on a stock motor (head doesn't count)?

    5. what exhaust are you running?

    6. what headers are you running?

    7. why go for bigger injectors if all the manifolds are stock and you run the flap type AFM?

    8. why wouldn't you turbo it?

    Who fitted the new head? the valve timing could be off by a tooth.

    "3.91" diff ratio HMMMMMM don't think so...... try 3.90.
    Last edited by Ausmpower; 06-19-2006 at 02:44 AM.
    BMW parts professional

    Previous rides:
    BMW
    E12 M535i (go the dogleg!)
    E28 M535i (MMM M88!)
    E34 535i M

    MAZDA:
    RX7 S-IV T04 (440 hp ATW)
    RX7 S-I 13b bridge port
    RX4 13b peripheral port

  7. #7
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    Jun 2006
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    Quote Originally Posted by Ausmpower
    Hmm........... You sound like a troll.....
    Answer these questions for me and I'll be able to help:

    1. what cam are you running?

    2. what chip are you running?

    3. what rpm are you shifting at?

    4. why would you put in an adjustable reg on a stock motor (head doesn't count)?

    5. what exhaust are you running?

    6. what headers are you running?

    7. why go for bigger injectors if all the manifolds are stock and you run the flap type AFM?

    8. why wouldn't you turbo it?

    Who fitted the new head? the valve timing could be off by a tooth.

    "3.91" diff ratio HMMMMMM don't think so...... try 3.90.
    i'm using a 272 cam with a jim c chip, i shift at the 6800 mark and i figure a adjustable reg to add more gas to compensate for the extra air from the ported head, the headers are stock can't find and a performance set, exhaust is stock, the manifold is also ported ,don't have enouggh money for turbo and i will check the timing cuz that could be an issue and what u mean not 3.91

  8. #8
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    May 2006
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    Perth Western Australia
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    Quote Originally Posted by dom85m30
    i figure a adjustable reg to add more gas to compensate for the extra air from the ported head, the headers are stock can't find and a performance set, exhaust is stock, the manifold is also ported, what u mean not 3.91
    O.k you have a ported head (with a debatable flow increase) but it is still choked by the stock exhaust and AFM so your gain would be negligable.

    If it IS flowing any more air than stock the AFM would compensate anyhow and the EGO would stop it going lean. I have yet to see an NA M30 go lean with bolt on mods if the fuel pump is healthy.

    I'd be looking at getting the cam timing checked first, then fit a free flowing exhaust, MAF conversion (then dyno it to see you've only gained 20 hp).

    Diff is 3.9 not 3.91 ratio unless it's not an E34 diff....

    What "272" cam is it (brand)?
    How much lift?
    Hollow or Solid?
    BMW parts professional

    Previous rides:
    BMW
    E12 M535i (go the dogleg!)
    E28 M535i (MMM M88!)
    E34 535i M

    MAZDA:
    RX7 S-IV T04 (440 hp ATW)
    RX7 S-I 13b bridge port
    RX4 13b peripheral port

  9. #9
    Join Date
    Jun 2006
    Posts
    6

    Default

    Quote Originally Posted by Ausmpower
    O.k you have a ported head (with a debatable flow increase) but it is still choked by the stock exhaust and AFM so your gain would be negligable.

    If it IS flowing any more air than stock the AFM would compensate anyhow and the EGO would stop it going lean. I have yet to see an NA M30 go lean with bolt on mods if the fuel pump is healthy.

    I'd be looking at getting the cam timing checked first, then fit a free flowing exhaust, MAF conversion (then dyno it to see you've only gained 20 hp).

    Diff is 3.9 not 3.91 ratio unless it's not an E34 diff....

    What "272" cam is it (brand)?
    How much lift?
    Hollow or Solid?
    ok i understand that i need the exhaust done and a maf coversion i just don't understand why it is running slower then when it had the factory head and would u know of a place where i can get the headers

  10. #10
    Join Date
    Jan 2004
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    Elm Grove Farm, NC
    Posts
    770

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    My advice: Stop street racing- stick to the dragstrip.



    If the diff is a 3.9X, then it's a 3.91, not a 3.90- but it doesnt' really make a difference. Basically a 3.91 diff has 43 teeth on the ring gear and 11 teeth on the pinion, making it a 3.90909090909090909090909 ratio- if you want to get nitpicky. :P



    Bret.

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