Good questions guy's!
Do you notice much difference between the vvti motor compared to the standard 4.7 v8 motor ?.The 4.7 v8 come in a vvti right in the late models.
VVTi came out may 2005. So is actually in some of the last built 2005 through 2007 in USA. I saw one of these 2005 with VVt engine for sale in "mud" out of CA this year. People thought seller price was nuts, but they failed to realize what it was IMHO!
Yes I do notice a difference in power, they have a sports car feel. They have better acceleration and get better MPG on HWY. They go over the high mountain passes with easy here in the rockies. Not only do the cams change timing by rotating (advance) but intake manifold has set of 8 butterflies at top. These shorten length air travel once out of low end torque need for better (long air travel) low end torque.
These first two picture are from History of 2UZ-fe and happens to be from a page on Tundra, which is same engine only built in USA.
Mr Paul, if someone were to use the block off plates from the SAI bypass up on the valves themselves. Could you eliminate the two aluminum down tubes to the manifold and then use the cheaper exhaust manifold from the PRE 2005
4.7? I thought maybe you have both versions of them sitting around and you'd be the one to ask. ALso couldn't you use any other header designed for the 4.7 pre SAI?
I don't do block offs for two reasons. 1) it's circumvents USA EPA laws. 2) It's not a bad idea to pull intake manifold now and then to replace gaskets. Reason is; these VVt tend develop leaks at intake to head gasket. Additionally the VVt doesn't get that nasty gas smell on cold start up like the non VVT.
That's said I do not think you can use any other exhaust manifold. You could eliminate the downpipes (
1730450010 TUBE SUB-ASSY, AIR, RH & LH) Notice in pictures heads have a small exhaust port just above the main ports. So one would need a way to block these. These is what the block off plates do at end of exhaust manifold if I understand the kit. But I've never looked at the kit really. I stick with factory design all I can. This pictures is the overheated engine.
One guston that may come up is the short block of the VVT the same as the non VVt 2UZ. No it is not. They change the piston IIRC, bearing metal for EPA and added oil jet to underside of piston tapping into main oil passage.
One of the question I have is the Japanese built 100 series engine using leaded or the newer lead free bearings. Additionally do we have difference in connecting rods metal. Are there differences in tolerances. Bottomline I avoided USA made engines in my hunt, as they have issues we don't in some not all short blocks. (short block: block, crank & bearing, rods and pistons.)