1993 E36 325i m50 possible carb conversion

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  1. 1993 E36 325i m50 possible carb conversion 
    #1
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    eazy e's Car Details
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    Having seen several videos of rally cars running on carbs and sounding amazing has got me thinking. How hard would it be to convert my 325i to carbs and what kind of power increase could i expect?
    1996 316i compact m3 Kontour rims. lowered m3 bumper and mirrors and a basic streetbass system
     
     

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    anything is possible, the carbs fitting is easy just need to get a manifold made up. Not sure about the electronics side of things possibly run a new engine managment system.
    Rich
     
     

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    Carbs and ITBs are different things

    Carbs are ancient tech, airflow sucks in a mist of petrol as it passes, and ITBs are individual throttle plates like on the M3 with the regular electronic fuel injection.

    Getting ITBs to fit is the awkward bit, M3 stuff doesn't exactly fit, the oil filter housing gets in the way (M3 oil filter housing fixes this) and it'll need an adaptor plate making up to join them.

    It's then left with the injectors firing at the wrong spot, as the adaptor plate has moved them back from the head.

    It has been done though...



    but I'm not sure how good the results were.

    Official solutions are stuff like the dbillas kit which costs about the same as an M3 engine.



    2.5 non vanos, Dbillas throttles, M3 coils, M3(?) exhaust manifolds. (fitted on a 1 series)
     
     

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    This is what I have in mind for my 325i, but it will happen sometime during summer. I know a few poeple who have already done it, but none if them actually tested the mod on a RR.

    There is a good point with the injectors firing at a different spot, I never really thought about that. But it should still be better than stock manifold, shouldn't it?

    A different way of fitting them was to cut a piece out of the oil filter housing to make it shorter, and using a different oil filter. That would eliminate the need for adapting flange for the ITB's. Maybe more efficient than the adapter method?
    There are only two products required to make the universe work properly: Duct tape and WD40. 


    If it moves (and it shouldn't): duct tape. 
If it doesn’t move (and it should): WD40.

    Everything else is just stuff.
     
     

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    tbh I've had a dbilas manifold and itb's in the past and I didn't think a lot of it but i was thinking of using bike carbs so need to know where i stand on the electronics side of things
    1996 316i compact m3 Kontour rims. lowered m3 bumper and mirrors and a basic streetbass system
     
     

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    Quote Originally Posted by mistreku View Post
    This is what I have in mind for my 325i, but it will happen sometime during summer. I know a few poeple who have already done it, but none if them actually tested the mod on a RR.

    There is a good point with the injectors firing at a different spot, I never really thought about that. But it should still be better than stock manifold, shouldn't it?

    A different way of fitting them was to cut a piece out of the oil filter housing to make it shorter, and using a different oil filter. That would eliminate the need for adapting flange for the ITB's. Maybe more efficient than the adapter method?
    Believe me, it's far from easy to get the M3 ITBs to fit an M50.

    As Enda has rightly said, the fuel sprays directly against the port wall, so power gains could actually turn into a power loss.

    Go Dbilas or fit a full M3 lump
     
     

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    mistreku (03-03-2011)

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    I know it's not a straight forward job, but I know several people who have done it. Only problem I haven't thought of, is the injectors akward spraying..

    Dbilas are waaaaay too expensive and really not worth it. As for the m3 lump, it would be nice and probably best value for the money, but I don't have that kind of money. And I'm not bored with my M50 yet.

    And last but not least, this would be a quite cool mod to have, especially since is so rare.
    There are only two products required to make the universe work properly: Duct tape and WD40. 


    If it moves (and it shouldn't): duct tape. 
If it doesn’t move (and it should): WD40.

    Everything else is just stuff.
     
     

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    Quote Originally Posted by mistreku View Post
    I know it's not a straight forward job, but I know several people who have done it. Only problem I haven't thought of, is the injectors akward spraying..

    Dbilas are waaaaay too expensive and really not worth it. As for the m3 lump, it would be nice and probably best value for the money, but I don't have that kind of money. And I'm not bored with my M50 yet.

    And last but not least, this would be a quite cool mod to have, especially since is so rare.
    I think you might be under estimating the amount of work involved in doing this properly.

    The bodies themselves if fitted properly with correct spray angles as well wouldn't give much power on their own. You would need some very hairy cams to take advantage.(Dbilas do some) Then you need solid lifters to take the high revs.
     
     

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    #9
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    My car is already pushing 223bhp@6100rpm, so it won't be ITB on a bare stock engine. I'm hoping to release some extra hp from the ITB's (5-7 I reckon?), and more than that, maybe upping the max power output to 6500rpm. That alone, and it would be quite an advantage on 1/4m racing.
    There are only two products required to make the universe work properly: Duct tape and WD40. 


    If it moves (and it shouldn't): duct tape. 
If it doesn’t move (and it should): WD40.

    Everything else is just stuff.
     
     

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    #10
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    Going back to running the m50 on carbs, I think it's a great idea. I'm contemplating running bike carbs when i get round to dropping an m50/m52 in my e21 316. Putting it together would be pretty easy: 3 dual barrel bike carbs mounted with silicone hoses, lower pressure fuel pump (and pushing rather than sucking) and an ignition control. I guess it's the time tuning on a rolling road that'd be the expensive bit.
     
     

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