[TERRA Operative]

Ok, so you want better response and power from your 4AGZE? You think a larger throttle body is the go, but you want to retain stock idle control and driveability?

You could install the larger 4AGE throttle body, but you loose idle control, what to do?

Hang on a sec. Isn't the 3SG(T)E throttle body about the same size as the 4AGE throttle body? Doesn't that have an idle speed control motor? yep and yep.



Well, let's give it a go.



(Some of these pics will be of the 4AGE throttle body instead of the 3SG(T)E throttle body. The process is still exactly the same).




Step 1.

This mod should take about a day if you've got everything on hand.

Parts you will need to complete this mod:

* Gen 2 3SG(T)E throttle body (55mm butterfly diameter, not the Gen 3 60mm TB, it won't fit)
* Gasket sheet or throttle body gasket
* 2.5" rubber or silicone 90deg elbow (The stock alloy elbow may fit, but it's a big restriction).


Tools you will need:

* Pliers
* Phillips & Slotted screwdrivers
* Die grinder/Dremel/etc
* Stanley Blade
* Socket set
* Feeler Gauges
* Hammer
* Scissors
* Multimeter




Step 2.

First thing is to remove the intake piping, original throttle body and the alloy J-pipe that runs from the throttle body to the supercharger.
Now, using the gasket from the 3SG(T)E throttle body as a guide, trace the size of the hole onto the J-pipe opening where the new throttle body will sit. Remove the 2 studs as you won't need them anymore. I was able to easily remove them with my pliers.
Take your die grinder/Dremel/whatever you've got, and grind out all the metal to the line until you have a smooth transition to the new throttle body. Using WD-40 or Inox etc. will help with the removal of alloy if you're using a grinding stone.
You may also have to grind a little off the side of the J-pipe to clear the bracket for the throttle cable. Line up the throttle body on the J-pipe and you'll see where it has to be taken from.


Here you can see where I've ported it out. The pipe increases in diameter as it goes in, so only the top inch or so needs enlarging.



and how you want it to look inside.




Step 3.

Now it's time to modify the throttle body.


First of all, mark a line on the throttle position sensor (TPS) to the new throttle body, so you know how it was exactly positioned. Now, remove it and turn it 180deg. This will allow it to clear the ABV on the J-pipe.
What you need to do is make sure that the TPS has been turned exactly 180deg. By feeling how much deflection the tabs make when it's in its stock location and copying that to the new location you should be able to get it pretty close. Don't worry about it being a little out, we'll adjust it perfectly in a sec.
Now, remove the throttle cable bracket from the 4AGZE throttle body and swap it with the one on the 3SG(T)E throttle body.

You should now have something that looks like this..



Ok, now turn the throttle body over. see that rectangle hole? That's for the idle bypass. The way it is now, it will seal against the gasket and not allow any air through, so you won't get idle up.
Use your Dremel or whatever to cut out some metal to make a hole. you want your hole to be as big as the channel through the throttle body (see the pic below).
There were also a few fittings I didn't need to use, so I pulled out the attachment on the outside where you would put the vac line and filled the remaining hole up with epoxy (Araldite).



You can see where I took the metal out. The holes I filled were the two you can see there IIRC (I know I filled the bottom one). You can just plug the fittings without gluing anything up if you want, I just wanted it a bit neater. Don't glue until you are sure you don't need them though, my setup, being previously modified, may be a little different with vac line connections...


*Oh, now is a good time to remove your ABV if you want to. Just make a plate up with a bit of aluminium and bolt it on with a bit of sensor safe silicone smeared on the stock gasket.
You'll also have to plug up the hole in the other side of the intake. A 20 cent piece fits nicely, or anything else that size.


Now install the J-pipe and throttle body back onto your car.
You may need to swap the plug on your loom to that of the one for the 3SG(T)E TB, alternatively, your TPS from your 4AGZE TB may fit (but I don't think so...)




Step 4:

Time to adjust the TPS..

Make sure you have the TPS connector disconnected.
Insert a feeler gauge between the throttle stop screw and stop lever.
Using the multimeter, measure the resistances between the pins in the TPS as per the table in the pictures below.



Rotate the TPS back and forth until you get the right readings.


Step 5:

Screw your adapter onto the TB. I used the stock one from the 3SG(T)E TB.



I filed it out a little and bevelled the edges.



So when I slipped the silicone bend over it wouldn't disturb the air too much.
That blue hose shooting off to the right is for the A/C idle up. Connect that back to the VSV valve on the firewall.
Also, I found bending the slot the accelerator cable goes in out a little helped make the action a bit smoother due to the offset of the pulley thingo.



Here you can see the idle up pipe. This needs to be connected back into the intake, between the air filter and TB. Use some hose and a brass fitting or whatever to connect it back in.
Here I have rotated it down to hide it a bit. You can do this by loosening off the screw holding it (tamper proof screw) and adjusting it to where you need it.


You'll have to figure out the rest of the intake system yourself. Mine is so different to stock, I can't even remember how the stock one would go together with this setup.....




Step 6:

There may be two vac lines coming from the power steering. This is an idle up function, and is not needed, nor does the 3SG(T)E TB have connections for it. Just loop a bit of hose from one connection to the other on the steering rack to disable it.

Also do the same for the coolant lines. The 3SG(T)E TB relies solely on the ECU for idle control and doesn't need the coolant circuit.




Step 7:

Now, once everything is put together and plugged in, start the car.

Note what the idle does. If it rises when the car warms up instead of dropping, you need to swap the two outer wires on the idle control motor around (leave the centre wire alone). This will reverse the direction of the motor so it closes as it warms up, dropping your idle.




Step 8:

Drive and enjoy.

[TERRA Operative]

Now for the ABV mod (or Air Bypass Valve Mod).

The air bypass valve basically acts as the blow off valve and the waste gate all in one on the 4AGZE. It opens when the supercharger is not in use to reduce the restriction the supercharger has on the intake system, and also limits the boost to about 8 PSI, not what we want for performance.

But we can fix that..



You can remove the brown VSV for the fuel pressure regulator, and plumb the FPR straight to the intake manifold. This will allow you to remove all those VSV's and associated pipework to clean up the engine bay a bit.

[Adz]

Would the 3sgte throttle body upgrade make a difference on a 4age?


Forget i asked just read the 4AGE is the same size anyway.

This post has been edited by Adz: 11 November 2009 - 12:18 AM

[Casey-G]

Adz, on Nov 11 2009, 12:29 AM, said:

Would the 3sgte throttle body upgrade make a difference on a 4age?


Forget i asked just read the 4AGE is the same size anyway.

its a completely different manifold though?

[TERRA Operative]

3SGE will bolt up to a 4AGE manifold, but as Adz said, they're the same size anyway. Also, the 4AGE uses a wax slug setup for idle control, whereas the 3SGE uses a stepper motor.

Although the Gen 3 3SG(T)E throttle body is 60 mm, but you'll need an adapter to make it fit as the bolt spacing is wider.

[5lovegtz]

Hey jared

I noticed that the TPS on this TB is the same as the ae101 gtz levin.. 0330 part number? the thing is mine is differnt on my ae92 and this part isnt compatible with my ecu as i have tryed swapping them over as my TPs was abit busted but i have managed to fix it now.. So i guess i will have to swap them over too?
As for the ICSV with the wax pellet for the normal 4agze tb. This doesnt have coolant lines on this one so how will it just work? or wat? because ive had that tps and another ISCV differ to mine on and it shat itself and didnt work even tho they looked identical. The sensors are differnt to the ae92s.

[TERRA Operative]

The coolant lines are just bypassed (loop them together on the engine) as they are not needed at all.

As for the TPS, I think I swapped mine over to the 3SGTE one. I can't remember 100%, but if your AE92 one fits on the throttle body, use that, otherwise, you'll just have to experiment. You will probably need the plugs for any replacement TPS's as they will be different between models.

If you can swap the TPS plug on your loom to the AE101 one to use the AE101 sensor (or whatever is needed), it should be compatible. I'm running an AE92 4AGZE ECU on my AE101 setup and it works perfectly. The TPS signals are all pretty much the same, the only thing that's really different is the plug and the mounting style.

[5lovegtz]

hmmmm... i have 3 ae101 Gtz tps's dont ask me why but i managed to accumlate that many .. i did a loom swap wit hthe plugs perfectly and i just couldnt get it to idle properly or accelerate properly every time i moved the butter fly it sound like it suffercated and shat itself. but my original one on and it worked.. maybe my ecu is wierd or something.. theres not a lot about my car i have come to relate to other forum members.. bits and bobs here and there dont match up. one thing i know tho is it wasnt compatible with my ecu :S
s##t knows man.. the pistons i have in my car are OEM but they wer ones that no one really could figure out .. i just hope i have ae92 rods as im planning on swapping my mint pistons ontop of them sometime in the future when i get bored.

lol

[TERRA Operative]

Interesting. I just want to get in your engine bay to figure all this stuff out , except that you're in another country.....