Very late to the party - I was watching a 2GR-FXE engine teardown video on youtube and found out from the presenter that the V6 engine for the hybrid models comes with both port and direct injectors. That's what he said even though he was tearing down the conventional 2GR-FE engine, not the FXE, which is what is installed in the RX450h.

(listen to the commentary at the 1 minute 10 second mark)

Is there any truth in that comment? I always wondered why the intake manifold on the 2GR-FXE is higher than the 2GR-FE, but never really looked carefully. Perhaps that is to account for the additional injectors. I had always thought that it was for the EGR which the 2GR-FXE engine has (something the 2GR-FE does not have, i.e. RX350)

Anyone know for sure?

Also, in driving the engine, any idea when the ECU uses port vs the direct injectors? Would be good to occasionally exercise the port injectors just to keep the build up of carbon down on the inlet manifold valves.

 

There were several versions of the 2GR-FXE engine, some with both types and some only with only multi port injection, see attached Wikipedia entry:

2GR-FXE[edit]

Atkinson cycle, VVT-i, uses cooled EGR system.

For the Lexus RX 450h, the compression ratio was 12.5:1. For the Lexus GS 450h, the compression ratio was 13.0:1.[11]

Applications (calendar years):

• 2010 Lexus RX 450h, (GYL10/15/16), without D-4S (conventional multi-port indirect injection) 245 bhp (183 kW; 248 PS)
• 2010 Toyota Highlander Hybrid, without D-4S (conventional multi-port indirect injection) 245 bhp (183 kW; 248 PS)
• 2012 Lexus GS 450h (GWL10), with D-4S (both multi-port indirect and direct injection) 292 bhp (218 kW; 296 PS)
• 2013 Toyota Crown Majesta, with D-4S (both multi-port indirect and direct injection) 292 bhp (218 kW; 296 PS)

 

Ok, so the 3rd Gen Lexus RX450h only has port injection. Simple then! 6 injectors instead of 12 injectors. :-)

Found a video that covers all the 2GR variants and their applications.

Simply amazing how many different variants of this engine exist!


So basically the Lexus GS450h has the port and direct injection version of the 2GR-FXE.

I had forgotten the 2GR-FXE has Atkinson cycle until I watched this video!

 

The GS450h version of the 2GR-FXE also has an electric water pump, so no serpentine belt at all on this engine.

 

Yes. I’m not sure how they get away with not cooling the engine when it’s off. The remaining heat from combustion would heat it up.

 

Hi,

I do have a 2013 RX450h AWD. According to this thread, it has the 2GR-FXE engine. But, reading through the thread, I can't seem to confirm if this Lexus year/model has BOTH port fuel injection AND Gas Direct Injection (GDI).

Oh, Lordie, looks like it has BOTH. I saw this page https://mag.lexus.co.uk/2gr-fxs-lexu...ine-explained/ . It says:

"That new-found athleticism is echoed in the advanced D-4S fuel system, which seamlessly switches between direct and port injection for an optimal air/fuel mixture. This has allowed the engineers to set a high 12.5:1 compression ratio to better balance the unit’s delivery of power, performance and emissions."

 

The 3rd gen RX450h has a 2GR-FXE engine. That article above talks about the 2GR-FXS engine which is the 4th gen RX450h.

I don't believe the 3rd gen RX450h 2GR-FXE has direct injection, rather only "old fashioned" port injection, happy to be corrected.

 

Thanks for the clarification! That's great! GDI is a pain to replace or clean the injectors.