well....what a timely thread this one is.
i have a 1UZFE project going at the moment and the engine makes 190kW in std trim with 10.4:1 CR - with the god awful factory headers (think of those yukky 'log' manifolds you see on oldskool turbo 4cyl's - but on the exhaust
). add some custom headers and a good exhaust and that figure jumps to a massive 230kW. THATS how restrictive the exhaust is on these things. not unlike a rotary really...
the early engines can take 20psi of boost with no internal mods - and 22psi will make it go POP so yeah that's really pushing it - and really quite remarkable considering the high factory CR. that a total CR of over 17.0:1 - diesel territory.
i have witnessed a 1UZ on the dyno with a wolf 3D and 6psi GT30R spit out 400rwhp thru the factory automatic tranny. the guy was 'only' chasing 350rwhp so he got a massive shock! i remember the torque figure being in the 500Nm zone as well - at the wheels
it seems all these engines need is a little bit of boost to really wake them up. they are a very understressed engine too with 6 bolt mains caps (that's four in the 'regular' spot and two thru the side of the block), individually weighted and measured pistons (early engines only) and a forged crank. lets also not forget the webbed block, oversized oil delivery system and 'almost' factory dry sump arrangement (the crankshaft doesn't swing thru the oil in the sump).
the downside to these engines is the overly conservative exhaust cam timing - so conservative they are still open when the piston swings into the intake stroke. this really hurts power potential, and custom cam blanks are $1850 a set at the moment and they're made in australia, and you still have to pay for machining (another $400) and shims for the tappets.
the std cams are too fragile to machine and lobes break off most cams that are reground.
so in NA form, the 1UZ is a bit of a stalemate when for the same price as a set of cams and individual throttle bodies, you could have bought a big single turbo and wastegate off ebay and plumbed it yourself for more power and another four transmissions to match
the A341Es aren't known for their power handling capabilities, but if you're nice with it and don't slam it from neutral to drive at the track it will last.
if you use KDog's tiptronic controller ($250) the shifts are also a lot firmer, quicker (i think the shifts are made in half a second) and there's a 'gear' you can select with it that locks up the torque convertor at cruise to provide better fuel economy - but you can't tow of accelerate with it. this kit also has a little LED readout of what gear you're in.
but it doesn't fit into everything either. the 1UZ is basically a 700mm cube - and most of the time the driver's side head will foul on the steering box.
i'll post pics of my conversion when it's finished. the write up is here for the moment though http://www.freewebs.com/pro240c/