[DLSJ5]

Great questions, and thank you for the kind words, E85 could be interesting for sure, I hope these are satisfactory answers! -

Originally Posted by Chako

I am assuming these dynos were all done on 91 octane California fuel?

The VT2-625 kit requires 93 octane or better. So the DLSJ5_ESS_VT2625 run is on 95 octane, no meth. But both of the other runs are on 91 octane no meth.

http://bmw.pencilgeek.org/showDyno.php?recID=447
http://bmw.pencilgeek.org/showDyno.php?recID=317
http://bmw.pencilgeek.org/showDyno.php?recID=311

Originally Posted by Chako

1) Besides the pistons and rods; did anything else need to be
upgraded? (ie. bearings, cylinder walls, heads [PnP, valves, retainers/springs], etc?)

We used BMW Motorsport connecting rod bearings that are slightly different from stock. Valves, guides, retainers and valve springs are all stock. The pistons were a drop-in to the factory holes. No boring, honing, or sleeves. No head work; factory head gasket. A custom fuel system designed by ESS is required.

Originally Posted by Chako

2) I am assuming you used coated 2618 Forged LC pistons? How do you rate them for daily driving? <-- For example, are they loud on
startup? Were you told anything regarding longevity?

These are factory Mahle pistons from the same assembly line as the S65 motor; they have the same exact coating and different ring configuration. There is no extra piston to wall clearance since it drops right into the factory hole without boring/honing. Same piston to wall clearance and same Mahle piston means no extra noise above stock and I would guess similar longevity. The motor is every bit as smooth as the factory motor and tuned to perfection.

Originally Posted by Chako

I was wondering about this as well: the heads and blower I am assuming are efficient up to 8400RPM. I am suspecting it is an octane thing as well; you can see in his 94+Meth tune (VT625) his AFR at 8000 and 8400 are about the same:

However, on the 91 octane VT3 tune, his AFR richens up the higher RPM the car climbs above 7900:

Tuning continues, so these are first look numbers. We'll see how it looks when all of the dust settles.

Originally Posted by Chako

Also quite curious as to what kind of PTW clearances S65's with these pistons are using!

Factory piston to wall clearance since these are LC factory pistons and literally drop into the factory hole without boring/honing.