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just wondering if there was a lower and a higher horse power version of the Lexus dual motor GS450H transmission? something along the lines of Gen 1 and a Gen 2 and if so what was the cut off year?

please and thank you
 

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I haven't ever heard of anyone mention this, and, I suspect it would have come up if so.

The same group of people that are using them, will meanwhile refer to Prius transaxles and controllers by their generation version, and have different hardware. All I've ever heard mentioned was GS450H.
 

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Lexus did a complete overhaul/redesign of their entire GS line after the 2011 model year, which included the GS450h.

The 2011 GS450h got 25 MPG and did 0-60 in 5.2 seconds; the redesigned 2013 model got 31 MPG and 5.6 seconds 0-60. These are pretty significant differences...but I don't know if it's due to different hardware or if they simply reprogrammed it to sacrifice a bit of power for better efficiency.
 

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Lexus did a complete overhaul/redesign of their entire GS line after the 2011 model year, which included the GS450h.

The 2011 GS450h got 25 MPG and did 0-60 in 5.2 seconds; the redesigned 2013 model got 31 MPG and 5.6 seconds 0-60. These are pretty significant differences...but I don't know if it's due to different hardware or if they simply reprogrammed it to sacrifice a bit of power for better efficiency.
Thank you this is inline with the Wiki and some of the eBay pricing:

Third generation (appears to be broken down into two runs)
2005–2007
2007–2011

Fourth generation
2011–2015
 

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While there are generations of the GS hybrid, they all seem to use the same transmission, which is the Aisin L110.
https://www.diyelectriccar.com/forums/showthread.php?p=1053993#post1053993

While the transmission didn't change, the engine changed from the 2GR-FSE to the 2GR-FXE. That looks like a tiny change, and they are the same size of the same engine family, but it is significant to efficiency.
 
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