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Author Anyone who knows about bmw mini superchargers in here!
Anton2K3
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Registered: 24th Jan 03
Location: Peterborough
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27th May 07 at 22:12   View User's Profile U2U Member Reply With Quote
Hey guys,

Righteo, i need some info about the bmw mini superchargers. I'm doing a conversion on my rallye, not a problem doing the fabricating etc, but i lack general knowledge about superchargers.

I need to know how the boost is controlled/adjusted on the BMW mini superchargers,

Whether it need oil feed/return

And whether i am going to need to lower my compression ratio to around 9.6:1?

Thanks for the help guys,

Anton
Robin
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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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27th May 07 at 22:14   View Garage View User's Profile U2U Member Reply With Quote
No oil feed is needed.
Anton2K3
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Registered: 24th Jan 03
Location: Peterborough
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27th May 07 at 22:15   View User's Profile U2U Member Reply With Quote
you sure, i've been looking at a mini with one on , and it seems to have feeds on it?
Robin
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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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27th May 07 at 22:16   View Garage View User's Profile U2U Member Reply With Quote
According to what I was told earlier, by RobHayes, who has one, it's a sealed unit with no oil feed.
Anton2K3
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Registered: 24th Jan 03
Location: Peterborough
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27th May 07 at 22:17   View User's Profile U2U Member Reply With Quote
excellent, makes life easier. Is rob selling his by any chance!?!?
Robin
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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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27th May 07 at 22:18   View Garage View User's Profile U2U Member Reply With Quote
It's attatched to a car ATM

He had one which he was going to use for a project, but didn't, so sold it, but his mum has a Cooper S.

He's probably the man in the know for the questions you have.
Anton2K3
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Registered: 24th Jan 03
Location: Peterborough
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27th May 07 at 22:19   View User's Profile U2U Member Reply With Quote
cool, cheers for the info robin
Anton2K3
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Registered: 24th Jan 03
Location: Peterborough
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28th May 07 at 09:55   View User's Profile U2U Member Reply With Quote
TTT anyone with more info?
jr
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Registered: 20th May 02
Location: Kent
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28th May 07 at 09:57   View User's Profile U2U Member Reply With Quote
the are not oil feed/cooled

dont know about comp ratio's
RobHayes
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Registered: 6th Sep 03
Location: Lincolnshire
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28th May 07 at 09:59   View User's Profile U2U Member Reply With Quote
no oil feeds

boost is adjusted by changing the pulley ratios

the mini runs compression of around 8.5:1
Anton2K3
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Registered: 24th Jan 03
Location: Peterborough
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28th May 07 at 10:20   View User's Profile U2U Member Reply With Quote
wow thats low! I still want it to be nippy at low revs so was thinking about having the CR a bit higher than that, around the same as a fiesta turbo.
g-man
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Registered: 26th Feb 06
Location: East Kilbride
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28th May 07 at 11:42   View User's Profile U2U Member Reply With Quote
Run a sturdy gasket and make sure you keep on top of fuelling. That way you can run standard CR and maintain low end go.

Not sure what the ET45 churns out boost wise, but I don't imagine being a charger, it'll be anything (or much) over 8psi.
RobHayes
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Registered: 6th Sep 03
Location: Lincolnshire
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28th May 07 at 12:14   View User's Profile U2U Member Reply With Quote
standard charger puts out around 7-8psi of boost, but will put out upto 11-12psi with the right size drive pulley
Anton2K3
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Registered: 24th Jan 03
Location: Peterborough
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28th May 07 at 15:50   View User's Profile U2U Member Reply With Quote
cool, sounds good. I'm a bit dubeous of keping standard CR as its rather high on the 106 S2 rallye i believe. However, they do run steel headgaskets as standard, and keeping standard CR would see better gains. Any mone opinions on this matter?
Anton2K3
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Registered: 24th Jan 03
Location: Peterborough
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29th May 07 at 19:20   View User's Profile U2U Member Reply With Quote
Anyone else got any thoughts on this?

Ta,

Anton

 
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