akira751 said:
Different compression ratios for the ES350 so it needs 91 but you can use 87 it won't knock.
http://www.answers.com/topic/toyota-gr-engine
Same engine.
Same compression 10:8.
The 2GR-FSE has higher compression.
The 3.5-liter V6 in the GS 350 and IS 350 models augments port fuel injection with a direct-to-cylinder fuel injection system. The direct injection provides a cooling effect in the cylinders, allowing the higher compression ratio that results in greater efficiency and power and enhanced drivability. All Lexus models are certified as Ultra Low Emissions Vehicles or better (ULEV, ULEV II or SULEV).
As far as the Camry and ES 350 ....
"BTW - you'll note two HP ratings for the 2GR-FE at 268 and 272... They are in fact the same engines. I've been dealing with octane switches for years in 2-stroke applications, the Camry and the ES both can sense and adjust automatically to fuel/octane quality... The difference in HP rating is pure marketing especially considering the following disclosure present on Lexus.com and not Toyota.com "Ratings achieved using the required premium unleaded gasoline with an octane rating of 91 or higher. If premium fuel is not used, performance will decrease." So, to get 272 out of the Lexus fitted 2GR-FE, you need to use premium fuel."
http://www.clublexus.com/forums/showthread.php?p=2176310
2GR-FE
The 2GR-FE is a 3.5 L (3456 cc) version. Bore remains at 94 mm but stroke is reduced to 83 mm. Output is 268 hp (200 kW) at 6200 rpm with 248 ft.lbf (336 Nm) of torque at 4700 rpm. This version features Toyota's "dual-VVT-i", variable valve timing on both the intake and exhaust cams.
Applications:
2006 Toyota Avalon
2006 Toyota Aurion
2006 Toyota RAV4 V6
2007 Toyota Camry V6
2007 Lexus ES 350
2007 Lexus RX 350
"The 3.5L V6 engine used in the '07 Camry is exactly the same engine used in the '06 ES 350. Both "versions" use knock sensor transducers (piezo-electric microphones which pick up the first hints of "knocking/pinging" before human hearing can distinguish such) screwed into the cylinder banks to feed the information to the engine control computer to tailor the ignition advance tuning on the fly. But the ES 350's engine is rated to 4 hp more. Why the difference? The ES 350's recommendation to use 91 pump octane vs. the Camry's recommendation to use 87 pump octane."