07350FROST

i have a '07GS350 in Glacier Frost and my engine bay looks the same with the covers removed!! must be something about the white painted cars???

whlkev

phew, i thought you meant your engine looks exactly the same as me, then i really got jipped!

TRDFantasy

For the last time, the GS460 definitely DOES have Direct Injection, and it IS a 1UR-FSE. The Wikipedia info is absolutely incorrect and I'm surprised nobody has changed it.

BIG thanks for those engine bay pics .

Now I think that we have FINALLY solved the mystery of the lower engine output on the GS460. Looks like due to space issues, Lexus was forced to put single air intake on it and that has resulted in lower engine power. Seems to me that the 1UR-FSE in the GS460 is starved for air and that results in the lower output. The air pipe looks smaller than the IS-F's air intake, and the awkward shape of the intake definitely impacts the engine performance.

If GS460 owners see big gains with a cold air intake or ram air intake than it will confirm that the engine is starved for air.

The mystery now seems to have been solved, but the fact remains Lexus should have done a much better job with the 3GS. Considering the 2GS was on the market for such a long time it's dissapointing that LExus made so many compromises with the 3GS design.

Lexus really needs to be focused and on the ball with the 4GS, and it needs to be a BIG improvement over the 3GS otherwise Lexus will be criticized to no end.

rominl

iTrader: (4)

we will see if that's true once there are intake available. but to me it's hard to believe a 40hp jump with intake though

TRDFantasy

The intake might not account fully for the 40HP decrease, but I think a large part of it could be intake, somewhere over 20HP.

rominl

iTrader: (4)

still that'd be awesome imho if gs460 snaps on a CAI and pick up 20 horses

kevin, do it!

whlkev

lol i would hate to be the guinea pig for everything, to do this right, I'll have to dyno my car before and after the CAI

also, increasing the airflow isn't going to do squat when the ECU isn't properly adjusted for the increase so proper air/fuel ratio will have to be remapped via chip upgrade (coming from Euro, everything is about chipping the car) and I highly doubt there is stuff like that for the GS.

then more air also probably needs more free flowing exhaust to maintain the proper back pressure, i already don't like where this is going. Intake+Chip+Exhaust is probably going to yield the best result for maximum of what 20hp?

so in short, I'll be going really broke just to find out why the GS460 lacks 38 ponies

socalJD

^ Oh c'mon, don't wuss out - think Nike (Just Do It) !!!
Give me your paypal addy, I'll donate $5 to the Kevin GS460 Hp fund . . .

maj75

I am looking for the LS/GS460 HP discrepancy as well, but I am not sure that the intake is the explanation.

The LS intake does not follow the traditional performance formula. The intake runners have sharp bends right in front of the throttle body. It also merges the air flow from the runners right in front of the TB. The GS runner looks like a performance runner in that it feeds air to the Throttle body in smoothly radiused turns. The throttle body seems to be the same on both cars. If that is accurate, I do not see how the dual filters account for a 40 Hp difference. If the LS had dual TB and intake tracts, I might feel different.

I think that the explanation lies elsewhere. Tuning, cams, exhaust or combination? What we need is to have a LS460 and GS460 strapped to the same dyno and see what is really there. Manufacturers in the 70s intentionally underated HP on cars for insurance purposes. Maybe Lexus did not want the GS460 to outshine their GS450h?

Maybe the power is there and we don't know it

whlkev

all i can say is.. we have both cars and the LS460L definitely pulls harder than my GS460

LexFather

maj75, thanks for using search!!!

Leeladisky

My Granite Mica GS460 has the same "paint anomaly." I actually had the service department at the dealer confirm it wasn't in an accident and painted, before I bought it (after I discovered this). Thankfully, my suspicions weren't confirmed and they all have the same paint job in the engine bay.

Lee

maj75

There were pages of discussion to wade through, the the search for "dual intake" got me to the right place!

rominl

iTrader: (4)

wow, and given the weight difference between the two cars, that seems to be quite significant then huh

maj75

I don't doubt you.

The investigation has to start with someone who has access to Lexus part numbers. Are the heads, cams, valves, exhaust manifold the same, LS/GS460? I can't imagine that the LS would have a more free-flowing exhaust, but anything is possible I guess. I'll bet that the LS intake system is more about eliminating intake noise than performance. After all, the IS-F is similar to the GS460 design and it manages to extract 416 HP.