superchargers, don't you need different pistons too!

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  1. superchargers, don't you need different pistons too! 
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    Link below to web site selling supercharger kits, but there is no mention of pistons, i know when you turbo a car you need better rods and different pistons, or it will melt pretty quickly! The same is for superchargers surely?
    http://www.activeautowerke.com/viewp...x?id=Product18
    look for e46 323 superchargers
     
     

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    you can run them on low boost on standard internals i think (5-6psi i think)
     
     

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    Quote Originally Posted by Deano16v View Post
    you can run them on low boost on standard internals i think (5-6psi i think)
    they are quoting 8psi, still generating a lot of heat.
     
     

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    moved it here...dunno if you've noticed this forum before,but there may be some useful info in here
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    yeah, i bet it does. I guess it depends on your budget and how happy you are running it on standards. I reckon if you're gonna do it then do it properly. Although that said there were factory approved supercharger converted 330's that ran standard bits and had no intercoolers etc either.
     
     

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    There are things you can do to run turbos and s/c's with virtually no mods to the engine itself. But on an old M20 engine your looking around 5-8psi tops iirc, which, tbh isn't worth the money and effort. A moden BMW engine may not like/cope with added boost pressure.

    If your charging your car, you really need to lower the compression in to your cyclinders, normally by buying low comp pistons. Sometimes stronger bolts and gaskets should be added too. Then you'll get more boost and more fun.

    TBH though, a S/C'ing is a simple principle and just using the engine to spin up the blower and force a bit more air into the engine surely should be fine? No. Never that simple.

    All depends on their ECU software. I would still go off, spend a fortune on M/S or something and do it properly.
     
     

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    A lot of vendors of supercharger kits will quote the power at 8psi. This is too much for constant driving. BMWs already have high compression, and 8psi will add to the detonation risk from more heat both from the intake charge and compression cycle.
    For all day use, 6psi is better.
    You will need to check your fueling so your injectos can manage enough fuel or you may become lean at high rounds and again have detonation.
    ARP bolts for the connecting rods are also good for tuning at normal compression.

    For more power, you can use lower compression pistons to bring the CR to 8:1 or near, and then you may use more boost. It is good to get stronger connecting rods at that time also.

    A small option is a bigger head gasket, but these can be weak.
    You need to check also that your supercharger can produce more boost that you wish to use on low compression engines.
     
     

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    hmmmm sounds like good reading
     
     

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    i dint think the issue was heat i thought it was bending or throwing a rod?
     
     

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    you can run (on the M44) safe upto around 10psi. i'm currently running 7.5psi quite safely. had a re-map to richen the mixture right at the top of the rev range, but other than that its fine.

    after 10psi the ECU starts pulling alot of timing and heat does become an issue. alot of guys in the state run water/meth injection to combat this. alot of them run upto 15psi on stock internals. the engines are pretty robust.

    exhaust heat on mine was a bit of an issue as was water temp, i have cured this with a 2.5" straight through exhaust i have built, in stainless

    just going through the second re-work of it, but with the sports cat it has defo liberated more power and cooler running
    Z3
     
     

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