Besides the exhaust and computer mapping, what are the differences between these two engines?

 

The B48O in the JCW has a different turbocharger, pistons, and a lower compression ratio. The JCW also makes use of a secondary intercooler located on the left side of the bumper, behind where the fog light would be on a Cooper S.

 

It was mentioned on another post that the b46 shares the same turbo with the JCW. Just wondering.

 

According to RealOEM.com, the turbo is the same between the MCS and JCW. I'm not sure why siriuszero calls the engine a B48O, the actual names are B46A20A in the MCS and B48A20B in the JCW.

The main difference with the JCW engine is the lower compression pistons (10.2:1 vs 11.0:1), in order to run more boost. The JCW's pistons are the same part number as in the 225i active tourer [with 258LbFt from the factory]

 

Not correct.

The B46 engine has the same turbo as the JCW B480 (note, not the same as the B48 that we get in Europe)

Also, its not an intercooler located where the fogs used to be, its an oil cooler

 

Sorry for the confusion, but it's because that's how I've seen MINI refer to the engines internally, at least at the dealer level - as abbreviations of the engine codes.

The full engine codes I've seen from MINI so far are:
B38A15MO for the Cooper
B48A20MO for the 2014 S
B46A20MO for the 2015+ S
N16B16MO for the 2nd gen LCI Cooper
N18B16MO for the 2nd gen LCI S
N18B16TO for the 2nd gen JCW

When you pull up a JCW VIN in MINI's service system, it shows up as B48O, a F56 S will come up with either B48M or B46M.

Seems RealOEM is probably more accurate with the BMW designated part numbers... carry on...don't mind me...

 

 

The more info, the better. Is the B46/JCW turbo actually larger? Anyone know what changed? Who is the manufacture of the turbo, actually?

 

???

 

Seems I had some facts mixed around re: JCW....into the bushes I go - don't mind me lol

 

Here's the part number search on RealOEM

It says F55 Cooper S, F56 MCS and JCW, and F45 225i SAT all use the same manifold/turbo. We'll have to wait until the part numbers come out for the F30 LCI 330i to see if that's a different turbo, as it is rated for 252HP.


-->sirius: I'm not surprised that MINI puts their own suffixes on the engines.

 

You wouldn't happen to know or where to look to find the same info for the SD Pistons and a turbo compressor map for the SD

11258571012

http://www.realoem.com/bmw/enUS/part...&q=11258571012

http://www.realoem.com/bmw/enUS/part...&q=11658570081

Be nice to know if I have some headroom to play with
I'm interested in adding a little more power to spice things up a bit

 

Here's the engine RealOEM for the Cooper SD

I have yet to find the MHI part numbers for any of the F56 turbos, so unfortunately I don't have any of the compressor maps.

The quick-n-dirty method is simply to raise the boost until it doesn't make any more power, and then dial it back because at that point you're over-revving the CHRA and choking the compressor. Unfortunately it's not that easy anymore unless you have a way into the ECU.

 

i can add boost to mine now i have the ff cable on my bms stage1 and jb4 firmware. im at +7 over stock with 100 octane and full race turbo back exhaust.

 

+7, KPa, PSI? Datalogs, dynos to verify?

100 octane isn't terribly practical for most of the country, is your car a trailered track car? I'm assuming it's not built for a specific class. Do you mean Full Race the tuner company or "full race" in some other way? Many tracks have noise regulations.

Oh interesting, last week you were at "+5psi". No datalogs posted on this forum based on your post history. Come on man, you can help better than this.

 

im running 93 octane with torco unleaded accellerator. ive got mquebed downpipe with no reso 2nd cat or muffler. just got my ff cable rite this week to add more than +5. dont have datalogs or dynos so you can call bs i dont care.

 

oh yeah with the ff flex fuel i can run like 3 gallons of e85 per tankful.