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Thread: Spec E46 - the next successful spec class?

  1. #21
    BMW Master bawareca's Avatar
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    I didnt read the rules and how they adress that ,but these engines have some problems at sustained 6000+ rpm.Aftermarket (ATI) vibration dumper is the bare minimum,and it is not unheard for the crank shaft position sensor ring gear to explode(inside the crankcase that is).
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  2. #22
    RaceTape Ninja Force McCocken's Avatar
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    Time to start a shop specializing in rear subframe repair.
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    Yer pal,
    Force

  3. #23
    Administrator ucfbrett's Avatar
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    Quote Originally Posted by bawareca View Post
    I didnt read the rules and how they adress that ,but these engines have some problems at sustained 6000+ rpm.Aftermarket (ATI) vibration dumper is the bare minimum,and it is not unheard for the crank shaft position sensor ring gear to explode(inside the crankcase that is).
    Is this due to vibration? Those six-cylinders are so smooth I wouldn't have predicted that.

  4. #24
    Sir flink
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    Inline 6's have long crankshafts which will cause the resonant frequency to be relatively low. Apparently the M52/S52 cranks are OK to be revved up to 7200 but things fail at 7300.

    If the sensor wheels are flying apart at 6000 then perhaps that's a different failure mode - the thing just isn't strong enough?

  5. #25
    http://www.trackhq.com/Banners/yellowsitesponsor.gif Blackbird's Avatar
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    Some SE46 interior shots -
    20140212_165156.jpg

    20140212_115400.jpg

    20140212_171226.jpg
    The seat is mounted to fit a 6'1" driver, you can see how much room is still available.
    No special effort was made to position the seat any lower than what the factory mounts will allow as is.

  6. #26
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    Nice job Moti. Those door bars look familiar
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  7. #27
    BMW Master bawareca's Avatar
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    Quote Originally Posted by ucfbrett View Post
    Is this due to vibration? Those six-cylinders are so smooth I wouldn't have predicted that.
    It is torsional vibration,or twisting.


    Quote Originally Posted by flink View Post
    Inline 6's have long crankshafts which will cause the resonant frequency to be relatively low. Apparently the M52/S52 cranks are OK to be revved up to 7200 but things fail at 7300.

    If the sensor wheels are flying apart at 6000 then perhaps that's a different failure mode - the thing just isn't strong enough?
    Yes,om M54 everything is made mainly from cheese,so failures are not uncommon.Maybe the sensor ring will not explode at 6000 rpm,but still that happens.But there are 2 main diferencies from S52-even smaller bore(84 mm) and aluminum block,which dont help the cause of high revving engine.

  8. #28
    Sir flink
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    I had the machine shop remove the sensor ring from the crank before balancing it (it's unused on an OBDI engine). They said "nope, it won't balance" and put it back on. wtf, the thing is symmetrical and is on the centerline.

    Not that this is relevant to anything.

  9. #29
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    M52 crank is a totally different part and can see north of 7300.

    S52 crank and a M54B30 crank, engine in a 330, are the exact same part. The class has a spec software with a 6500rpm limit. The bad things really happen north of that RPM. The torque band of a 330 is so broad combined with a 3.46 gear, that you shouldn't be hammering the limiter on one of these anyway. There is plenty to tinker with in a Spec E46, nobody should get bored.

    There is plenty of discussion on all this stuff with dynos etc, in the fb SE46 group which is public.
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  10. #30
    Senior Member robburgoon's Avatar
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    Quote Originally Posted by DBurke View Post
    The torque band of a 330 is so broad combined with a 3.46 gear, that you shouldn't be hammering the limiter on one of these anyway.
    And there went your cred. Rare is the engine that you don't take to fuel cut nearly every time.

  11. #31
    Sir flink
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    https://fbcdn-sphotos-g-a.akamaihd.n...03278395_o.jpg

    yup, that engine wants to be shifted at the rev limit.
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  12. #32
    http://www.trackhq.com/Banners/yellowsitesponsor.gif Blackbird's Avatar
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    Nice demo of the phrase "a picture is worth a thousand words".

  13. #33
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    Complicated, expensive, and fragile. Don't think so . . .
    The deposed former Sheriff of trackHQ . . .

    2006 Porsche 997 Carerra Coupe 6-MT - daily driver
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    2006 Mitsubishi Lancer Evolution IX MR 6-MT - when I need a backseat, 4-doors, or a real trunk, and still want to haul ass . . .

  14. #34
    http://www.trackhq.com/Banners/yellowsitesponsor.gif Blackbird's Avatar
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    Quote Originally Posted by Richard EVO View Post
    Complicated, expensive, and fragile. Don't think so . . .
    Don't hold back, Richard...
    FWIW, the E46 is not complicated, far from expensive and whether it is fragile or not is to be seen.
    It has known problems and known fixes, and if you ignore them it will come back to hunt you, but I can't think of a single track car that doesn't have some known issue, definitely not in that price range.

  15. #35
    BMW Master bawareca's Avatar
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    01-02 model with a minor damage could be had for less than $2k at salvage auction.High mileaqe is not an enemy of those engines,overheating is.
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  16. #36
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    dreaded double post in reverse . . .
    Last edited by Richard EVO; 04-18-2014 at 05:18 PM.
    The deposed former Sheriff of trackHQ . . .

    2006 Porsche 997 Carerra Coupe 6-MT - daily driver
    1992 Honda (Acura) NSX 5-MT - classic investment I couldn't resist and occasionally drive
    2004 Honda S2000 AP2 6-MT - track day car
    2006 Mitsubishi Lancer Evolution IX MR 6-MT - when I need a backseat, 4-doors, or a real trunk, and still want to haul ass . . .

  17. #37
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    Quote Originally Posted by Blackbird View Post
    Don't hold back, Richard...
    FWIW, the E46 is not complicated, far from expensive and whether it is fragile or not is to be seen.
    It has known problems and known fixes, and if you ignore them it will come back to hunt you, but I can't think of a single track car that doesn't have some known issue, definitely not in that price range.
    Just pullin' yer leg. But they are kinda heavy.
    The deposed former Sheriff of trackHQ . . .

    2006 Porsche 997 Carerra Coupe 6-MT - daily driver
    1992 Honda (Acura) NSX 5-MT - classic investment I couldn't resist and occasionally drive
    2004 Honda S2000 AP2 6-MT - track day car
    2006 Mitsubishi Lancer Evolution IX MR 6-MT - when I need a backseat, 4-doors, or a real trunk, and still want to haul ass . . .

  18. #38
    http://www.trackhq.com/Banners/yellowsitesponsor.gif Blackbird's Avatar
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    The weights that I saw weren't too bad actually, mid 2800s race weight.

  19. #39
    Senior Member fatbillybob's Avatar
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    Can one of you BMW guys tell us about the infamous rear subframe issue. It seems that every BMW since the E30 has some kind of weak spot that cracks. The cure is welding some kind of plate on the frame and the issue is fixed forever? I have never seen pictures of this repair and think that I heard that it persisted into the E46 but not sure if the E90/E92 has the same problem. I'm ready for school. Thank You.

  20. #40
    Sir flink
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    Problem:



    Solution:



    The M3s (e36, at least) come from the factory with the reinforcement. The non-M's break so you have to weld the M3 plates on.
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