I know that the supercharger will cause drag on the engine and start to fall out over the high end rpms, but I was wondering if anyone has thought of twincharging with a clutch-type supercharger pulley. This way it'll disengage the supercharger over the top-end so it won't fallout. Are there currently any twin-charge systems like this?

 

???
Maybe you could elaborate a little more. I think I have an idea of what you are asking, but I am not sure.

 

The supercharger pulley is clutch-based. If it reaches a certain rotating force it will disengage the pulley and leave it spinning on a ball-bearing so it won't cause any drag on the motor.

 

That is what I thought that you meant.
So, to attempt to answer your question...
No, I do not know of any "slipping" pulleys for the Mini Cooper S. But, with certain amounts of money anything is possible.
Also, If you are planning on using this with a Twin-charge set up, ie. run a turbo charger as well. Then, this could effectively be set up to "slip" at the RPM point where the turbo has no more lag. Thus, creating a twin charge set up that turns into a Turbo only kit at certain RPMs...This could be something to seriously think about, but it will take time and money...

 

I am out for the night, peace.

 

an easier option would be a bypass valve. mounted before the SC and dumping after it. this would basically turn the SC off but not mechanically. there is one on the MCS but its only small. maybe if a bigger on could be fitted it could work.

there are problems with these clutched pullies. Merc had ALOT of problems with the 55 AMG engines because of them.

thaks Chris.

thanks Chris.

 

If I understand what you said then that just releases the boost from the SC but the engine is still turning the pulley and with it SC drag. The purpose of a clutch-type pulley is to turn off the supercharger and leave the pulley spinning on a ball-bearing so there is minimal drag. If I misunderstood please feel free to correct me.

 

other problem is the the Water Pump is ran off the SC. Putting a clutch on the pulley stops the water pump as well as the SC

 

Get an electic water pump. People have done it, cant find the thread.

 

you are very correct. the problem with cltuches in superchargers is they aren't very reliable. Merc had massive problems with supercharger clutched giving up. and that was with millons of $ on engine developemnt and R+D for a company that has worked with supercharger for ages.

with the bypass method there is nothing mechanical to go wrong.

thanks Chris.

 

There is a dude here locally that invented this setup and had it patended on all his subi projects... The guy is a **** but the setup seems to work awesome and it looks crazy when you pop the hood... whatever size turbo you run with the kit, you can set the clutch on the sc pulley to kick out and it is also controlled by a bypass/wastegate valve.. It also turns on with a switch so you can run the system as intended, or turn off the switch and run turbo only... Turbo with blowoff and SC with blowoff... SICK!!! So ...yes... can and has been done before. I was gonna do this setup when I went twincharged but like I said, the guy is a ****...

 

If you can post some pics or a site address I would like to take a look at it. I can understand that you are not fond of him because he is a ***, but usually people are when they are trying to protect something...

 

No, its not just that he's trying to protect anything, it's just, he's a ****!! haha... He makes you pick the turbo and everything he wants, design he wants, parts he wants, says all the time he coulda went to work for the Government or whatever cause he has a degree in rocket propulsion so he's the man .... he really dosnt know anything about the Mini motor... nuff said, i'll see what i can do about pics...

 

^man, sounds like I am not missing anything by not knowing the guy

Thanks for digin' up the info

 

For the money, it's not worth it although it is pretty trick!!! What was it that you guys were saying about the M45 is clutched out???

 

Nevermind... read the explanation of it and thought he was sayin' thats what it does... Anyone ever think of dual superchargers???

 

I asked about dual superchargers, but it would create too much parasitic drag...now dual Rotrexes...Hmmm ask Jan about this and get his opinions...

 

haha... Im considering quad turbo... my mini guru has worked the dimensions before... im lookin into it...

 

Silly question here, but if the supercharger clutch engaged, the SC rotors would stop spinning. Wouldnt that seal the SC intake, leaving you with 1/2 the intake air volume?

 

not silly at all, you are correct sir! so what would need to be done, would be run the turbo charge after the supercharger in order to circumvent running your turbo compressed air into the supercharger which is how all twincharged kits for the MINI are designed, mostly for simplicity of the top mount intercooler.

 

ok how about we swap the twincharge idea around and do it how others have done.

have to SC and its cooler etc. run into the turbo. now hinbetween the SC and the turbo you mount a bypass vavle leading to a filter. on a hobs switch (and a WOT switch) you hold the bypass valve closed then open if once the presure after the SC but before the turbo reachs 0psi (ie the turbo is pulling all the air the SC can diliver). this way you get a nice and smoth transition to turbo power. you would have to then run a second intercooler like Tuls did but it should work and gets around the whole turbo into SC problems.

cheers

Chris.

 

Makes sense... I'll have to look into that theory, but Tuls didnt run a second ic... he ditched the heat soaking top mount and fabbed up his own crazy huge front mount... But I wonder if all the psi hitting the turbo right away is safe for it... hmm.....

 

in current setups the sc pulls the turbo...in that setup the sc would be pushing the turbo.....not exactly how its designed...could run into problems with the turbo shaft failing. you could ditch the intercooler from the sc then, as the turbo would heat the charge back up. You would only need one intercooler either way.

 

The other issue I see with either setup, would be the loss of boost. If you stop adding in boost from the sc you will lose that compound boost. Say sc is boosting up to 7psi adding in the turbo's 7psi and you have 14psi combined. You release the sc and the boost now drops from 14psi to 7psi or some variant, I mean physics is physics. It would be a pretty nasty surge...The only way I can see it working smoothly would be in the sc was adding in such a small amount of boost....Now you get into the fun of trying to tune the fueling for this. Its hard enough to tune these cars correctly as it is at the moment.

 

Trickle you have to remember what your ref point for the boost is. some take it straight off the turbo, a better way is off the manifold. that way the turbo, and more importantly the waestgate, dose what you want it to do at the presure you want it at.