Sorry that I imposed, I'll shut up. But my experiences, in two JCWj's granted not the F series would prove you wrong. The rubbing issue did go away. And if I offended anyone for adding my experiences here on a different matter, I apologize again. After I posted my post, I noticed that it was something different, but trust me, there will be a speedometer error. Just go thru a radar sign that we have here in Iowa, and there is a difference, even at 25 mph, of two miles off. Sorry, you won't here from me again.

 

I didn't say you're not welcome here, please don't misinterpret. It's just that nobody has done any radar or GPS verification to prove or disprove it either way with this platform. Now if you said "it's very likely the F56 has an optimistic speedo just like previous MINI's and BMW's", then I'd totally agree with that.

I know all about the R53 and R56 speedo error, I had 5 of them [3 and 2 respectively]. That doesn't mean this different car is the same.

I don't doubt your rubbing issue appeared to be resolved, but it wasn't a root cause fix, just a side effect of the stiffer roll couple.

 

I have verified via GPS that my F56 JCW has a 2mph error. (Same as my previous 3 MINIs and 2 BMW 335s). I asked for a recalibration and was told they (dealership) wouldn't do it, that BMW does that on purpose.

 

FWIW my 2015 F56S is 2-3mph off across the range, according to my GPS/nav. I believe you can adjust this via coding. And IIRC it's there because of German/EU regs.

 

Every German car I've had across brands has speedo error. Non issue. You can futz with the error by changing tire size if you care that much. Otherwise just enjoy your car.

 

Thank you for the observations.

 

What is the engine code for the JCW?

 

Someone posted that car manufacturers pay a huge fine if the speedo underestimates the true speed. So they fudge a little. Makes sense.

 

B48A20B

Similar phrasing appears to be EU legislation, where indicated speed is allowed to be +10%[+4kph]/-0%. e.g. 80kph actual speed can be displayed somewhere between 80 and 92 kph. I cannot however find any current legislation for personal cars in the USA.

 

So I've been noticing something strange. MINIUSA advertises different gear ratios for the JCW compared to the Cooper S. The transmission part numbers and descriptions are different, the Cooper S calling for a "GS6-59SG - TBFJ" and part #23008617542, and the JCW calling for a "GS6-59SG - TBFN" and part #23008617543. Despite that, I made a little chart and then recorded the observed speeds per gear per RPM, and discovered something unusual. The gear ratios at least in my JCW appear to be identical to the advertised ratios in the Cooper S. Check it out; the differences are pronounced once you see 4th gear and higher.

Trans_ratios_observed by Ryephile, on Flickr

When I make my "second date" appointment at the dealership, I'll have them check if the part number on the trans is correct. We'll see if it's a website typo or something deeper.

 

RealOEM finally updated their microfiche and there are some interesting updates. Finally we can see what the mysterious AMOeK looks like!

AMOeK by Ryephile, on Flickr

It's definitely a 2nd coolant radiator, as we suspected. It's also only on the JCW.


Another interesting tidbit, apparently sometime this summer MINI decided to make the entire exhaust valvetrain different, including the camshaft, springs, and specifically the exhaust valve stems are 1mm larger. For some reason, they also changed the pistons at the same time. The engine code is still B48A20B "up to 11/2015". The new exhaust valvetrain is now identical to both the low and high power output B48's across the entire BMW and MINI line-up, from the 2AT-er, 3-er, 7-er, X1, F55, F56, and upcoming Clubman. The intake camshaft is also changed, along with the VANOS actuators, with notes calling the new actuators "short". This appears to be a comprehensive re-think, though without an engine code change, it could be as simple as changing parts suppliers. The larger exhaust valve stem appears to be the only functional change, however going to a larger stem usually means lower flow, so I'm a bit miffed at this one.

The subsequent part number change with the complete cylinder head comments about "exchange retrospectively", which sounds funny to me.

I think that's it for the big changes,
Ryan

 

So, does this mean that the June produced JCW cars have the new valve train hardware?
Most likely done for commonization. Just a thought, but maybe they saw something about Cooper S cars with the JCW Tuning Kit and decided to upgrade the valve train hardware to JCW specs?

 

Commonization is a very likely scenario. The build dates however appear to span from June to September, so I'm not sure there's any way to actually find out what's exactly under our respective bonnets without an engine tear-down and measuring the exhaust valves.

I'm thinking that at the end of the day, the changes aren't performance or reliability related. The "shorter" VANOS actuator could be a cost-save, but that's strictly speculation.

It is fun to see the 730i share the same engine as the JCW. Such big price and market difference with the same engine seems remarkable. I recently drove the new G11 7-er [a 750xi] and it was absolutely amazing; smart money versus a Rolls Royce Ghost.

 

Hi Chaps.

I'm from the UK where the JCW is built. It's a no brainer.

A JCW is a JCW.

A 'dressed up Cooper S' just don't cut the mustard. Simples.

 

Amen brother!

 

I recently test drove a 2016 F56 JCW and S, both manual. I went wot in 1st gear to 5k and 2nd to 5k in sport mode. The S felt faster but I still ended up ordering the JCW. I always wanted a JCW since 2006 and finally pulled the trigger.

 

The JCW definitely has torque limiting in 1st and 2nd gears with the manual trans to minimize wheel spin. I do find it a bit odd how MINI chose to make the JCW the most "refined" with regards to the accelerator pedal.

 

Interesting. I know the Golf R has torque limiting in the manual to prevent premature drive train failure.

I take it the S doesn't have torque limiting from my seat of the pants dyno.

I noticed in the dyno sheets posted in another thread, the "stock" S does put down more torque to the wheels than the JCW.

 

Can anyone confirm if the JCW clutch is “stronger” than the S clutch on F56?

 

Realoem.com indicates different part numbers for the flywheels and clutch/pressure plate assemblies.

 

The major difference in the short blocks

B48A
B48B JCW

is the compression and there only the pistons, the connecting rod are identical. The sporty piston you find aswell on the B38 27ß I8.... M..

MCS - 11:1
JCW - 10:1
CRV - 9,7:1

so buy yourself some 9,5