I blew my engine on gs430 3uz motor . I am wondering if i can swap out my motor for aomwtbinf bigger or like ls460 motor or what can i do to make my gs faster can i swap LS460 ENGINE OR WHAT SHOULD I DO

 

What year is your GS so I can move it to the correct forum. 2001 - 2005 or 2006 up.

 

My gs430 is a 2006 engine blew trying to either put a bigger motor or any ideas

 

The problem is the electronics, if the engine ecu only controled the engine then the swap would be easy. But the ecu also controls the transmission, body electronics etc. The issue I see is what will control/manage the LS460 engine.

I think you would be easier off swapping a chevy LS truck engine/transmission swap then the LS460, that way you can put the chevy ecu beside as a stand alone. You will make more hp with a chevy engine.

 

How did you blow a 3uz?

 

I was thinking you could get the motor and transmission out of a GS460 along with the ECU but wiring may be another issue. If you got the time and resources, I would go for it. I've seen a few GS with a 2jz-gte but information on this is hard to find.

If you want the easy way, there are plenty of 3uz-fe engines out there.

 

The engine ECU in the 3GS doesn't actually control all that much to be honest (beyond the engine and transmission that is). Doing a GS460 engine swap would be feasible.

This is obviously without a ton of research, but I would think you'd like need the following items along with some miscellaneous bits and pieces:

08-11 GS460 engine and transmission with ECU(s) and wiring harness
GS460 engine and transmission mounts and brackets
GS460 or GS F drive shaft
Differential (optional, I think the GS430 gearing would work well)
Fuel pump and hanger
Fuel lines from tank to engine and charcoal canister
GS460 shifter assembly
Possibly the GS460 gauge cluster

I think if you had that stuff you'd probably be in good shape to complete the swap without too much trouble. All pieces can be used including the ECU.

Jeff

 

I think you need to ask what increase you’ll get with a gs460 motor vs replacing with an easier to find and cheaper gs430 motor and doing a power adder like nitrous

The 460 is an increase of 52 hp at the crank over the 430. Better for sure but not a big change. A bit of googling, from C&D

 

I think you pretty much hit it on the nail. Honestly, if I could go back. I would have chosen a GS460 given my options. I settled for a GS430 though. It's fun, it picks up pretty nicely. Just that it's powerband is showing its age...

290HP and 18mpg-20mpg is not a lot... Especially with some higher HP cars like the charger do 21+ MPG.

You've been on the forums a lot longer than me Dave, how do you feel about the 3uz-fe and nitrous? I've heard the connecting rods on these cars are extremely weak. It's just about the only reason why I haven't fabbed up a turbo manifold and downpipe on the car (the rest is easy work IMO, minus an EMS). I may, in a year or so, pick me up a C8 or a GS-F. Then i can seriously tinker with this car... My next car will be 100% virgin (except maybe audio and minor bolt ons).

Hopefully I don't grow bored of my car before I can commit to a bigger project (I've had it since 2010, but I still love walking to the car and opening the door every day, going on rides, and just truly enjoying it as a whole).

 

agree with the weakness you mentioned. Just think a small shot will get the same or better power than a 460 transplant with all the extra stuff you’d need to do to make it work. Get a replacement 430 and put some mild power adder on it and get out a ton cheaper.

 

I know I will get flack for it, but a GS350 swap would be more economical, sure the 350 has 39 less hp then the GS460. But you will gain 13hp over the GS430. You will be lighter then both, the GS460 is 300 pounds heavier then the GS350.

GS350 power to weight ratio 0.082 hp/lb

GS460 power to weight ratio 0.087 hp/lb

The difference is so small between the two, but with less weight you will also increase handling and braking of the car. The 350 is cheaper and easier to tune now that they have cracked the ecu's. Guys are slapping turbo's on them and making them over 500hp on stock internals with a street tune on regular gas.

Buying a cheap rolled over GS350 and swapping the whole vehicle over in a week or so would be an option. But thats a lot of work, that I think wont be worth the hassel. Personaly I would sell the car with the blown engine at a salvage auto auction, recoup my losses and buy a GS350.

 

While I agree that a GS350 is lighter than a GS460, it's not quite that much lighter.

Curb weight on a 2008 GS350 RWD is 3795 lbs, for a 2008 GS460 it is 3945 lbs, so 150 lbs difference.

That said, for the 2007 GS350 RWD, it is listed as 3704 lbs, and 3748 lbs for a GS430.

Some of that variation can be attributed to the other options vs. standard equipment, which can mean just looking at these numbers may not give the whole picture. But, lets look at this a bit differently, here are the weights given by Lexus:

1UR-FSE: 511 lbs
AA80E: 212 lbs
GS460 Total: 723 lbs

3UZ-FE: 419 lbs
A761E: 188 lbs
GS430 Total: 607 lbs

2GR-FSE: 399 lbs
A760E: 185 lbs
GS350 Total: 584 lbs

GS350 to GS460 difference using these numbers: 139 lbs. Add in the extra weight for the headers, cooling, etc., and 150 lbs sounds reasonable.

Using the numbers for the same year (2008), the GS350 is 0.0806 hp/lb and the GS460 is 0.867 hp/lb.

For myself, I'd probably just throw a 3UZ back into the car, if I was going to do any sort of swap, it would probably be to the 1UR, but it would depend on how much I could get each engine for I suppose. The 2GR is a good option as well.

Jeff