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Was reading an article in Ward's Auto World, and came across this article on "10 Best Engines Awards For 2006". Among those listed was the 3.5L DOHC V6 from the Lexus IS 350. Anyone know if this is related to our V6 in the 4.3, sure appears that it is, but HP and torque ratings are higher..........
http://wardsauto.com/reports/2006/tenbest/auto_toyota_motor_corp_2/

OC :?:
 
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No the Lexus engine is more innovative as it adds gasoline direct injection (GDI) and some minor improvements to the regular 2GR-FE found in the Avalon, RAV4, and Camry (thus its called 2GR-FSE). Toyota's gdi first application was in 2004 or 2005 I think.

GDI was briefly introduced to the automotive world by Benz in 1955 and it was until 1996 when Mitsubishi reintroduced the technology did other brands start making GDI engines again.

With GDI you can get better fuel economy and higher output.

Mitsubishi, VW, DC, PSA, GM, BMW, Mazda, and Toyota all now make GDI engines (they use different marketing names for them).
 
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Its still a good efficient modern V6 engine.

I think its good Lexus is doing more to differentiate their products from the regular Toyota line.

They are going by way of Nissan - FWD platform for most of their cheaper products and RWD platform for most of their premium products (Infiniti in Nissan's case).
 

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It is still the same engine -- the only difference in the IS350's is that it has the dual direct injection system.
 
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karrock said:
It is still the same engine -- the only difference in the IS350's is that it has the dual direct injection system.
Which makes a huge difference and is THE key reason it won the Wards award :roll:

As described in the January 2006 issue of SAE Automotive Engineering International, the system primarily relies on the port injection system when low engine speeds are combined with high loadings. Under these conditions, a direct injection scheme cannot properly atomize the fuel, and so approximately 60% of the fuel is provided by the port injector. As engine speed increases, the direct injection system takes over more of the fueling responsibility, until eventually it provides 100% of the necessary go-juice. Obviously, there some complex calculations going on to determine the optimum fueling over the engine's operating range, and that has led to over 300 patents being issued to Toyota concerning the design of this system.

There's a 7% increase in HP and 7.5% increase in torque from the system, some of which comes from the 11.8:1 compression ratio that's enabled by the use of direct injection. Better yet, the benefits apply to the entire powerband, so this is a feature that will be useful to most any driver.

The dual injection system also reduces cold-start emissions. The port injection system dumps a bit of fuel on the back of the closed intake valve; when that valve opens, the fuel is evenly distributed throughout the cylinder. As the piston approaches the top of its travel, the direct system injects a bit more fuel into the cavity on top of the piston. The total air/fuel mixture in the combustion chamber is slightly lean, but the mixture is significantly richer in the area around the spark plug, making it easier to ignite in a cold engine. The result is quicker warm-up and smoother operation when cold.

The engine produces 306 HP at 6400 RPM, and 277 lb-ft at 4800 RPM; a remarkable accomplishment for a luxury-car V6.
 
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