Just as the title says. In my pursuit for more horsepower and torque, I'm now going to be testing a newer 2uz 4.7 liter composite plastic intake manifold off a 2005 and up tundra or gx470. the reason why is because of multiple reasons. first being, the intake manifold is a composite plastic which is lighter than the aluminum ones and are much better at heat resistance to keep the intake temps down. second, the 2uz intake still has the variable length runners. longer length for lowend torque than the butterflies open at 4000k and the intake length is shortened for topend. third, the overall height is taller which makes the initial incoming air into the cylinder heads longer travel which should cause a higher torque output at lower rpms. yes there maybe a trade off up top but that is to be determined. for someone like me, Im trying to balance things out after putting the big 20's on the ole' 430. The downsides to this is going to be figuring out the different throttle body setups. Now on both throttle bodies between the gs430 and the 4.7 platform, there are a total of six pins for circuits that control the throttle bodies, two of the terminals control the operation of the electric motor that controls the throttle blade and the other four are for tps sensors correlations. however, the gs430 has its own two pin connector for the throttle motor and the new 2uz throttle body has one big six pin connector for everything. the easiest thing to do would be to use the 2uz throttle body and buy whats called a pigtail with the six wires and splice them into the gs4xx harness. also you'll notice the bolt holes for the throttle body on the 2uz will only work with the 2uz intake. I'll keep my fellow members posted as to the progress. thanks for reading.
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Is the throttle body on the 2UZ that much larger to actually need to change it, or is it just because of the mounting? I'm just wondering if it might actually be easier to just have an adapter fab'd up to mount the 3UZ tb to the 2UZ intake manifold? Also, are you going to be using both the upper/lower parts of the manifold or just one end? Finally, will you be porting/polishing (not sure how this will work out on a plastic piece) either the intake manifold or tb?
Interested to see how this goes and good luck with it. Subscribed.
part of the main reason im going the plastic intake route is because of the plastic overall having a smoother intake tract for the air to flow thru. thus no need for porting and polishing. the throttle body mounting for the 2uz is different. it would be much easier to just use the 2uz throttle body and buy the pigtail that is made for it and rewire the gs430 harness to make it work. the 2uz composite intake will obviously be used as one piece.
This intake project has turned out to be more than I anticipated. But being a car guy with a hint of stubbornness, I've decided to ride it till the wheels fall off. I initially started off with a bare plastic intake manifold off of a 2006 tundra.I bought the bare intake because I planned on swapping over the fuel rail and injectors from my 3uz intake but I quickly discovered that the 3uz injectors are a diff. design and will not fit in the 2uz intake because their air assisted so their wider at the base. So I had to jump back on ebay and scoop up the 2006 fuel rail and injectors that luckily flow within a few cc's of fuel flow as my 3uz injectors. even after that I now have to seal off the return fuel line on the 2uz because my 3uz is a direct fuel line with no return. Now im on to fabbing up an adapter for using my 3uz throttle body. I just didn't feel like screwing with the wiring and pigtails. So far it's making progress. Ill update pics as I go.