Posted 29 May 2010 - 05:05 PM
1UZs are over-rated. Well, sort of. They're great motors, just not when you have to put them into another car.
Pros
-4 liter displacement
-pretty light (~490lbs with an R154 compared to a 2JZ with no trans at ~590)
-quad cam
-6 bolt cross-bolted mains
-forged, well balanced internals from the factory
-supposedly the stock injectors are big enough to run boost
-with enough mods you can make as much power as a 2JZ can with similar mods.
-they sound awesome with ITBs on them
Cons
-not as easy to work on as a JZ
-no bolt on 5 speed option and adapter kits get pretty pricey
-32 valves, so if you need to re-shim the valvetrain or change valve-seals it's a big job (2 people I know have had to do this with theirs, they wanted to die)
-power output is not stellar (250 horse 260ft/lb)
-fuel economy isn't great ~16-19mpg (I get mid-high 20mpg range with my single turbo 1JZ, as good as the stock 5M)
-you have to build your own headers for most applications.... lots of fab
-they don't sound as good as a JZ IMO
You did say that's you're basically set on a boosted platform, so just get a single turbo VVTi 1JZ and be done with it.
"JZXP - we get death threats" -Rayray
"This is my job man, I do this on Tuesday."
-1987 AE86 Corolla with 20 valve swap SOLD
-1985 MX73 Cressida 1JZ big single swap breaking diffs on the regular
Toysport and 935 Motorsports suck. Don't buy from either.