Guys, I think I have the best BMW turbo installer in China here...PS2 done in 6 hours, holy crap...that's even including one hour for lunch and break. Not a single mistake. Not a single issue.
It surprises me that M2 PS2 in 2018 version is quite different than 2016/2017. It has not only a better fit and finish but also more importantly an updated design of BOTH compressor and turbine which you can clearly see, comparing the attached pictures to the ones I posted earlier.
I cannot comment what difference this smoother and nicer looking compressor would make, but turbine is definitely a freer flow design. There is a cut, which is new, on the blade edge, which is trading spool up for less back pressure, as exhaust partially bypasses turbine rather than pushes or gives momentum to it. It seems Pure is really trying to upper the power or efficiency game, trying to compete with all these new STG3 turbo.
Powertrain wise, this M2 is FBO geared minus fueling.
ARMA carbon fiber intake
Pure Inlet Pipe
TIC and CP
Wagner Evo2 Competition IC
Catless Downpipe
3D Design Catback
Pure Stage Two
BTW, he also has KW club sport 3 way, AP Pro5200 brake kit to accommodate 18" BBS RI-A on 265/285mm P Zero. And anti roll bar & etc. Pretty track prepared.
I loaded OTS STG2 93OCT (the one everyone is using) to the new PS2 and test drive it. Despite of the fact that OTS isn't tuned for radical spool up and new PS2 seems to give up a little spool up, I felt this M2 PS2 is more responsive than the 335i PS2, 1/4 mile world champion, of my another friend. PS2 has really improved over these years (only 3 years actually) in terms of everything.
To make no mistake, lag was felt. I could tell my friend wasn't particularly satisfied with PS2 power until we have open road for deep throttle on 3rd gear and a little 4th. Once PS2 gets on boost, torque blew him away, which is comparable to GP500 at these boost level as expected. The power even broke traction of his 285mm P Zero on downshift to 3rd, something he never imagine remotely possible with stock turbo. In fact he's already been used to having full traction on 2nd with FBO stock turbo.
Additionally, as long as PS2 isn't completely off boost, throttle on/off response is sharp, which has a lot to do with the great DCT. That, in conjunction with the outright power, makes it easy to forget the lag in building up boost.
Regarding power, one thing I want to add - Monstrous torque, everyone can have it with stock turbo on a tune designed for it. However, how hard it comes is how quick it falls as rpm goes up. You short shift wishing to stay on power as if you're trying to gloss over your blemishes at upper range. This is the point - with STG2 turbo, you'd only wish gear is longer so there is more you can explore.
I was trying to log a few full 3rd and 4th gear pulls. I knew without looking, everything logged on OTS would be capped out with PS2. I only wanted to check the lag in spool (compared to GP500 and stock/STG1 turbo), boost curve and rail pressure. However, it started to rain and was going to rain for next 10 days or so (raining period of the year). We'll log when possible.
Below is a log of my car (GP500) I grabbed on my way back home. There was a window rain stopped and I found dry road under elevated road. It was on 3rd gear. Not enough road for 4th gear.
GP500, ambient = 32C/90F, 80% humidity.
18~19psi
Pump gas 98RON (AKI93)
http://www.bootmod3.net/log?id=5b38d28fd10b437334792d1b
Mighty GP500 and mighty HPFP of mine!
Despite of how poised this GP500 handles the super power (for a pump gas N55) as log shows, I'm going to dial it back a little LOL
Cheers.