a few questions about the m111 engine

[Downside190]

Hi

So i'm currently putting c230k engine from a 1999 model into my mercedes 190e and using a megasquirt ECU to control it all. The car isn't running yet so want to ask a few questions before I go any further with my build.

I have wired up the electronic clutch and bypass valve to manual switches I can control from within the car (bypass is set to fully open or fully closed). Would having it like this cause me problems as it basically means I can engage the supercharger manually when I want (although I know not to turn it on over 2k rpm).

I read that the bypass valve can be removed completely with no issues but not sure how true this is or if it can be replaced with a wastegate instead?

Another is how much extra power can I expect with the megasquirt ECU as I can fine tune it to my liking?

I also ditched the standard intercooler in favour of a slightly larger one. Will this cause me any unforeseen issues? I have ditched MAF sensor in favour of a map sensor as this is easier to set up with megasquirt.

Thanks in advance

[KrumB]

Hi,

For the bypass valve you can use something like this:
http://www.ebay.co.uk/itm/BMW-Mini-Cooper-S-R52-53-Supercharger-Bypass-Cutoff-Valve-Part-No-11617568423-/331446307279?pt=LH_DefaultDomain_3&hash=item4d2bbd49cf

You CAN drive the car perfectly safe with permanently engaged S/C magnet. Stock it's engaged permanently after ~1500 RPM.

If you want entra power you should use bigger crank pulley and/or smaller S/C pulley.

[Downside190]

Hi,

For the bypass valve you can use something like this:
http://www.ebay.co.uk/itm/BMW-Mini-Cooper-S-R52-53-Supercharger-Bypass-Cutoff-Valve-Part-No-11617568423-/331446307279?pt=LH_DefaultDomain_3&hash=item4d2bbd49cf

You CAN drive the car perfectly safe with permanently engaged S/C magnet. Stock it's engaged permanently after ~1500 RPM.

If you want entra power you should use bigger crank pulley and/or smaller S/C pulley.

Thanks would that bypass be big enough? The one on the c230k seems larger than the mini one or would it not make a difference?

[KrumB]

This kind of valve has been tested on a m103 with a s/c and works perfect.

[Downside190]

This kind of valve has been tested on a m103 with a s/c and works perfect.

How does it work? Is it vacuum powered or does it require a cable to operate it?

[KrumB]

Vacuum opens it and boost closes it. It works perfect.

[Downside190]

Vacuum opens it and boost closes it. It works perfect.

Excellent, thanks for your help.

[Pocketzest]

I'm really curious about this because the stock bypass valve totally negates the best part of having a roots type supercharger- positive displacement. Mercedes programs it to function more like a centrifugal supercharger, where you build boost linearly with your rpms. The roots sc should be capable of having nearly full boost at any rpm so it'd be sweet to not have the bypass valve constantly bleeding boost until you hit like 4500rpm. I'd love to feel what kinda low end torque you have with this sort of setup. Has anyone actually done this with the m111 2.3k that could report results? Theoretically it should work, even with the clutched pulley.

[202brabus]

Why don't you have MS controlling the sc clutch instead if the manual switch. Which MS do you have