omeadm

Does anyone here know the difference in the engine package setup on the RC F and the IS F
I see that they both have the 5 L direct injection motor but i wanted to know if lexus has modified that isf motor more to be even better.

rjmalm

I copied this from somewhere, sorry I dont have the reference.
RC-F
New or redesigned parts include:
•Cylinder heads and cam covers
•Crankshaft: crank pin diameter, connecting rod big-end bearing size and crank counter-weight size are all reduced, to reduce reciprocating weight
•Crank main bearings and caps
•High-strength forged connecting rods
•Pistons and piston rings
•Titanium inlet and exhaust valves
•Intake manifold and throttle body
•Redesigned Variable Valve Timing-intelligent Electric motor (VVT-iE)
•Revised Lexus D-4S dual injection system
•Four-into-one exhaust headers and heat insulators
•Oil pan and baffle plate
•Alternator clutch system
•Engine and transmission oil coolers
•Spark plugs

Digging Into the Metal
•The new cylinder heads improve the 2UR-GSE engine’s breathing with improved porting and a high-flow/high tumble ratio. In addition, intake surge-tank capacity has been optimized, as have the intake manifold runner length and diameter.
•The new oil pan baffle shape reduces agitation and hence friction, while new air-to-oil coolers for the engine oil and transmission fluid increase track suitability.
•The Lexus D-4S dual-injection system has been redesigned, with higher injection pressure of 2,611 psi and improved fuel atomization.
•The throttle diameter was increased by 10 percent, from 3 to 3.3 inches (84 mm).
•A new intake camshaft profile increases valve lift and suits the Atkinson cycle, while improvements to the electronic VVT-iE system have expanded its range of operation for increased fuel economy and performance.
•New four-into-two exhaust headers help reduce interference and hence further improve engine breathing. The larger-diameter exhaust system is designed to reduce backpressure and sound amazing, especially under acceleration. At the same time, the main muffler keeps things from getting too rowdy at lower speeds.
•As a final touch, the new 2UR-GSE engine has a one-way clutch on the alternator pulley.

4TehNguyen

iTrader: (1)

416 hp vs 467 hp, RCF redline and mpg is higher too

6i9

iTrader: (1)

How is MPG better? It has more power and more weight. The Otto/Atkinson thing seems like a gimmick and marginally prevents the real world MPG figures from being worse.

I used to average 17-18 mpg in my ISF and my RCF only is 15-16 mpg

Aside from that, it's to be expected to be worse than the ISF in that regard.

4TehNguyen

iTrader: (1)

EPA rating is 16/23 vs 16/25, and its a heavier car. MPG improves after a few thousand miles

omeadm

dang I did not think that all that went down with the upgrades but it seems like you did some research on this matter and the stuff listed sounds like some very good tweeks to the system.

4TehNguyen

iTrader: (1)

it was in the toyota/lexus press release when they first announced the car. Had to be significant changes for it to gain over 50 hp, more mpg, higher response than the previous iteration

http://pressroom.lexus.com/releases/...oduct+news.htm