ECO mode lexus LFA 2012 Technical Information / LEXUS 2012 LFA NURBURGRING PACKAGE GUIDE

33
Powertrain
LFA_Nurburgring_U
■Low friction internals
While the engine in the Nürburgring Package is the same engine model as the stan-
dard package, by meticulously adjusting items like the amount of oil supplied and the
friction surfaces of moving parts, a further reduction in friction has been achieved.
■Oil feed pump
In the standard engine, an inner relief system that circulates oil inside the oil feed pump
has been adopted. This restricts oil level fluctuations in the crankcase and oil pan,
achieving a reduction in friction and the occurrence of air bubbles in the oil.
Moreover, an exclusive pump was adopted for the cam timing adjusters (VVT-i). By
increasing the pressure of the oil supplied from the feed pump, the VVT-i can be oper-
ated even more effectively while the total amount of oil was reduced, thereby contrib-
uting to a reduction in total friction.
With the Nürburgring Package, the clearances inside the pump were optimized by
balancing the oil supply more precisely, further reducing friction.
■Piston rings
In the standard package's engine, linerless thermally sprayed bores were adopted for
the cylinder bore surface, simultaneously improving heat dissipation and reducing cyl-
inder bore distortion.
This accordingly made it possible to lower the tension of the top & second ring more
than that of a common mass-production engi ne and at the same time a thin 2-piece
nitride processed oil ring has been adopted, reducing friction losses.
Through the utilization of these aspects and optimized ring specifications, a further
reduction in friction has been achi eved in the Nürburgring Package.
LFA_Nur_J_U_K_M_OM77029U.book 33 ページ ２０１２年１月１７日　火曜日　午前１０時１３分

42
LFA_Nurburgring_U
■Tires
Through the adoption of a high-grip
tread compound, the Bridgestone
POTENZA RE070 tires have
improved anti-wear performance
and heat resistance ready for circuit
driving while increasing grip.
Regarding the tread pattern, by
increasing the size of the tread
blocks on the outside shoulder of
the tires, where the most load is
applied, the contact patch has been
expanded and rigidity has been
increased.
Furthermore, by adopting a con-
struction with a highly rigid reinforc-
ing belt, the sidewall rigidity is
increased, ensuring linear response
and grip when pushed to the limits.
Tire expiration date
In order to preserve tire performance, we recommend periodic replacement of tires
every 6 years. The 4 digits on the sidewall can be read as follows:
Inside Outside
Specification differences
from the standard model
Brand of tire changed
(different tread pattern and compound)
Bridgestone POTENZA RE070
Bridgestone
POTENZA S001 →
Last 2 digits of the
year of manufacture
Week of manufacture
In the above example, the tire was
manufactured in the 15th week of 2011.
LFA_Nur_J_U_K_M_OM77029U.book 42 ページ ２０１２年１月１７日　火曜日　午前１０時１３分