I just got done with my 2009 mini cooper s rebuild. I replaced the pistons with forged CP Carillo pistons and was wondering after I get done breaking the rebuilt engine in how much more boost can I add to the turbo?

Here is the link to the positions I put in, 77.5 mm bore and 9.5 CR
http://new.minimania.com/part/G2NME8...-Mini-Cooper-S

 

Are you going with a bigger turbo?
that's kind of a loaded question!
the idea with lower comp is being able to run safer higher boost leave's.
with that comp and a good tune you could run 1,4 bar all day long with no worry's/.
but like i sad its kind of loaded question .

 

I may eventually go.with a bigger turbo buy right now just the stock Borg Warner ko3 twin scroll but thanks for the insight

 

check out the jmtc GtD47mm or the frankenstein ko4.
ive been running the franksenstein ko4 for about a year with no problem's
an i just order up the jmtc gtd47mm from out motoring going to swap them out for this summer

 

I'll look into the franksenstein ko4. Is that a twin scroll as well or an open scroll?

 

Yeh it is a twin scroll.
its pretty much a stock turbo with a hybrid comp wheel an exhaust side.

 

You can run up to 30 lbs of boost on 9.5 to 1 pistons with meth injection. At 30 psi however it's recommended to either install a cylinder support system or Darton mid sleeves to close the open deck block. The CNC Werx CSS should be good for 400 HP and runs about $400. I'm currently running 1.7 bar on JCW factory internals with the X51 turbo and meth injection.