IS2000

Not that I'm complaining but I'm really wondering as to what advantage the 4.7L V8 (LX470 / Tundra / Sequoia) engine has over the 4.3L V8?

Tundra Specs 4.7L i-Force
245 hp @ 4,800 rpm
315 lb.-ft. @ 3,400

LX470 4.7L
230 hp @ 4,800 rpm
320 lb.-ft. @ 3,400

GS430 4.3L
300@5600
325 lb.-ft. @ 3,400

At first, I thought the 4.7L would have a much higher torque rating than the 4.3L since torque is what trucks need to haul heavy stuff around but then torque on the GS430 is higher.

Furthermore, if the argument is that the 4.7L produce max HP at lower rpms, I still think the GS430 has identical HP ratings at 4,800rpms. (I wonder if someone has a dyno chart for the GS430, I'd really like to know how many horses the 4.3L generates at 4800rpms)

So, my question is, why the 4.7L? Of course, 4.7 sounds bigger than 4.3 and should give the impression of better power all around -- better for marketing, but this doesn't seem to be the case.

///MDex

Good question. I don't know. But I do know it would be sweet to drop a stroked 4.7L into a GS.

Johnny Mo

I thought I remembered reading that it is the same block just a different stroke.

Iceman

That's a very good question. Plus, the 4.7 they're talking about for the GX470 doesn't sound too impressive either. Add to that the fact that bigger displacement usually equals poorer fuel economy, and we've got a real mystery on our hands!

Mark

They use a bigger block to reduce pressure so that the engine can handle more payload.

bitkahuna

iTrader: (20)

I believe the 4.7 is an iron block (stronger), while the 4.3 is aluminum. Since a truck is used to tow, it's good to have the strong block to withstand the demands on the drivetrain.

Plus, maybe more torque on the 4.7 is available at lower RPM (more useful especially for towing).

Max HP and torque rarely tell the story compared to a torque curve.

GS400_PUSHER

yeah man its all about the torque curve!!!!!!!

LexusRules

i think its exactly what Mark said.