IF i consider buying the US ECU, how much will it cost and from where?? And, can i install in myself for I should take it to the dealership?? Any warranty concerns??

 

holy crap batman! you're right!... i think i said that earlier in the thread

it can range from $100 to 2-3k..... depending on how lucky you get, from where i can see, you're S.O.L. because they're not on ebay from my searchings.... you can get one of us to order one for your GS from a US dealership, and yes... it will be costly lol.... and it's most likely a DIY, it will also void your warranty in the electricals area of your vehicle, ur ECU controls 90% of everything in your car =[

there's also risks in doing this besides warranty.... like fitment (no one is 100% that this is plug and play from a USDM spec to MEDM(middle eastern domestic motors?) spec the wiring diagram may be different between a US version and yours.... so i'd do a bit of research before i jump on this project...

also you're not guaranteed that you will get 342 out of your vehicle.... there's not only the mappings of your ECU, but the engine settings, like cams, injectors, pistons, etc etc. that can slightly be changed to compromise for the power loss.....

on the upside, you'll be a legend cuz you'll me the first to do eeeet (if successful)

 

Lol, after reading your post, my determination to go through this actually decreased substantially hehehe. I guess i'll stick with me 322 after all :/. Dont know if I should mention this here but I actually found out about my -20 HP after an Infiniti G35 passed me which was really weird >.<... hehehe

 

I agree.

GS350 is 303hp in the US and listed at 307 in Taiwan.

 

Well if its a different rating system dont you think the LS460 would have the same HP since they both share the same engine

 

i didn't mean to rain on ur parade... i just don't want you coming back saying "**** you gokou, u LIED!" hahahaha..... like i said though rider, do a bit of research on wiring diagrams, and map out a way and find the ECU, if worse comes to worse, go EBAY your USDM spec ECU hahaha.... i'm pretty sure you'll sell it back and only lose a few pennies over it.... and if you succeed you'll be a legend =]

and about the G35... you shouldn't be ashamed... our cars? they're PIMPMOBILES! not dragsters... in my opinion anyways... the GS's are heavy vehicles, because they're loaded with a lot more **** than anything... if u wanna compare, u should be comparing to a M35/45 hahaha.... us 430's lose to them, but... i'm sure a 460 will hold it's ground

don't you guys use higher octane ratings? lol we use 87 89 and 93.... might be why you're 307 vs us 303

they do this to lower class US-spec cars.... a "JDM" B18 would always be faster than a "USDM" B18.... mostly because of engine internals are tuned differently combined with the ECU having different mappings..... so that's why i said what i said about the ECU might not be hte only thing to unlock those 20 ponies

 

What does octane ratings have to do? I think ours are 91 and 98

 

Could indeed very well be a different method of calculating HP.

If not.... How does the published 0-60mph or 0-100kmh compare to countries where there is 342 hp (255 kW) available (in Europe 5.8 s to 100 kmh)?

My GS300 in Thailand is listed as 228 hp only, while the same GS300 in Europe is 245 hp (183 kW). 0-100 in Thailand is 7,5 s and in Europe 7,2 s. Lexus Thailand denies detuning, but cannot explain the difference either....

 

surprised you didn't know this one! the higher the octane rating, the higher your timing can go, the higher your timing can go, the moar powah u can get! =] up to a certain point anyways.... after that certain point you need tuning

o wow, really? we all need to band together and petition to get MOAR POWERRR

 

i cant exactly know the 0-100km/h since our dealerships does not mention them. I tried once and I think I got high 5's low 6's... cant really know the precise number.. Think I'll test and post a video

 

octane rating calculations are different from countries too..

US is on AKI, other countries are on RON, US ratings # is typically 4-5 pts lower than the rest of the world

 

i would hate to be your service manager

 

Interestingly GS300 in Bahrain got the same HP rating as in Thailand (228)!

Could the reason be something to do with the quality of gasoline (other than the octane rating) such as impurities (sulfur etc), hence for reliability reasons Lexus playing it safe and not taking out the full potential of the engine. Just a wild guess.....

 

Well in Bahrain and Asia Pacific we dont have Direct Injection Cars (reason why the GS300 has 228 instead of 250.. Different Engine).. something to do with fuel quality... i've always thought that the Middle East had the best gas out there but who knows... Well Nissan cars here have MORE HP than the one you guys have :S.... A G35 is rated 330 HP here instead of the usual 303.... Lexus is the other way around

FROM WIKI:
3GR-FE

The 3GR-FE is a 3.0 L (2994 cc) version with Dual VVT-i. Bore is 87.5 mm while stroke is shared with the 2GR at 83 mm, with a compression ratio of 10.5:1. Output is 170 kW (228 hp) at 6,400 RPM, and 300 N·m (221 ft·lbf) at 4,800 RPM.

Applications:

* 2003 Toyota Crown (GRS182) (China, Asia-Pacific ex.Japan)
* 2005 Toyota Reiz (GRX121) (China)
* 2005 Lexus GS 300 (GRS190) (Middle East, Asia-Pacific ex.Japan)
* 2007 Lexus IS 300 & IS 300 C (GSE22) (Middle East, Asia-Pacific ex.Japan)

[edit] 3GR-FSE

The 3GR-FSE adds D4 direct injection. The 3GR-FSE engine is rated at 256 PS (188 kW; 252 hp) at 6,200 RPM and 32 kg·m (314 N·m; 231 ft·lbf) at 3,600 RPM.

Applications:

* 2004 Toyota Mark X (GRX121) (Japan)
* 2003 Toyota Crown Royal & Athlete (GRS182/183) (Japan)
* 2006 Lexus GS 300 (GRS190/195) (Europe & North America)
* 2008 Toyota Crown Royal (GRS202/203) (Japan)

 

So the direct injection is missing! Sounds plausible. Maybe the same for GS460? I just hope Lexus has a good reason for doing that. Fuel economy is also worse.