2000 e46 323 ci - differnce from 325 - Page 2

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    #11
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    Quote Originally Posted by vauxfan View Post
    so what are the tuners prefences for that 190 bhp mark?
    Best to check with those tuning guys I mentioned above .
     
     

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    Quote Originally Posted by NealP View Post
    Best to check with those tuning guys I mentioned above .
    they said get a good exhaust, filter and re- map will give 10% but if i need an exhaust and filter, then this can't be the difference between the 325 and 323 if they both have identical parts! 10%for the chip will give 17bhp in theory, so chip alone should give 187 bhp on a good engine roughly.
     
     

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    I'll find out the exact differences for you...I have an old skool BMW brochure lying around somewhere
     
     

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    SO I looked up the figures...only difference I can see is the stroke is different on the same bore size. 323 is 75/84 and 328 is 84/84. Also slight variation on torque figures.
     
     

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    The smaller stroke reduces bhp and torque unless other components are different. It would alter the compression ratio as the cylinder capasity would be less in the swept area, this would be corrected by using a thinner head gasket or decking the block/head/both.. It would alter the total capasity of the engine and the efficiency to not only burn fuel but to change dirty gasses for clean ones, and the ability to fill the chambers on the induction stroke.

    I thought both where a 2.5 tho, if the stroke of the 323 is 9mm shorter you cant replace that unless you tune the tits of it. Or force induce it
    At the end of the day tho, there is no replacement for displacement
     
     

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    Quote Originally Posted by NealP View Post
    SO I looked up the figures...only difference I can see is the stroke is different on the same bore size. 323 is 75/84 and 328 is 84/84. Also slight variation on torque figures.
    now i am totally confused, i wanted to know the differance between the 323 and 325 as the engines are both 2.5s, is it just the remap? or is it the tb and manifold? or is it the stroke?
     
     

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    Quote Originally Posted by vauxfan View Post
    now i am totally confused, i wanted to know the differance between the 323 and 325 as the engines are both 2.5s, is it just the remap? or is it the tb and manifold? or is it the stroke?
    The latter.
     
     

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    The e46 323 is a M52tu engine. 256S4 Engine code.

    The e46 325i is a M54 engine. 256S5 Engine code.

    Cylinder head and Headgaskets are the same.

    Cranks are the same.

    Blocks are different.

    Con rods have different part number so also different.

    Pistons are different.

    Exhausts are different.
     
     

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  11. The Following User Says Thank You to Ronnie For This Useful Post:

    james (11-04-2009)

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    #20
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    ah yes cheers ronnie,

    theres loads of stuff different between them
    Exhaust manifolds even, 325 with cats built in,
    I think the 323 have them very close to manifold but bolt on seperately

    conrods & pistons as said will be a massive difference between the two




    If you really want it to be loads faster you will always be better just getting an m3 or 330ci instead, will be a lot cheaper that lots of mods or buying turbo/supercharger kit
     
     

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