So I have heard on CL and Youtube and other comments passed by people that the GS460 has the same motor as the LS, but it's "de-tuned". I have found NIL confirmed or factual evidence so far and would like to know where this comes from, and if it is true, what, exactly is done by Lexus to de-tune the GS motor. Is it simply a fuel/ign map, or is it a restricted intake volume, or something else physical? I really would love to know where these comments come from as nothing factual for me is just, well that. I'm not about to stick my car on the dyno (just yet) to see what the numbers actually are vs. an LS.

Does anyone actually know what the difference is that makes the GS supposedly de-tuned? Or ANY differences in the motors between GS & LS? You could look at the factory spec and see lower numbers and just say "ah yea that one is de-tuned", but I want to know what is different if anyone could enlighten me

 

You probably have already found this thread:
https://www.clublexus.com/forums/gs-...-pictures.html

BR.Sami

 

Yea thanks for reminding me of that Sami, think I may have been the one to give that a bump so have merged it with that one now...

Merged in to... https://www.clublexus.com/forums/gs-...-pictures.html

 

I can clear this up pretty easily,
The LS460s 1UR-FSE has a dual intake, a 2 to 1 exhaust manifold that is found on the ISF and a true dual exhaust, as well as ECU changes resulting in different AF ratios. This results in decent power output of 380 bhp.
The GS460s 1UR-FSE has a single intake, log type exhaust manifold and the same y-pipe exhaust found in the IS and GS350, as well as ECU changes resulting in a less than optimal AF ratio and the loss of power to 342 bhp.

In the JDM and USDM markets this is the same in all GS460s and why they only make 342 bhp. Easily enough this is all reversible and 400+bhp out of the GS460 is already possible.

Both the GS and LS have 11.8:1 compression ratio and a 2.9 rear differential.

 

Yes it's true. You can see it on monitoring software as it'll run about 9:1 AFR at higher RPM at high load. Swap ECU/flash it and that is gone. People can also bump it up to 7000rpm.

As mentioned by @Treybo7 there are intake changes and exhaust/headers (exhast/headers will be biggest change). However, the throttlebody is the same, air filter can be easily changed and I doubt it's much of a restriction anyway. I've had much smaller filters on bikes that make nearly 200hp..
I'd pull the exhausts off an LS460

 

Yes, any ISF intake will fit just fine, I'll be running RR-racings carbon intake and box with an ISF air inlet. It will need minor modification. For the price of an LS460 exhaust and the cost to mod it to fit you would be better off with a custom 2.5in dual setup with a X pipe. PPE headers should be ready any day now and we should see 400+ bhp with them.