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View Full Version : O/S 4AGZE throttle body upgrade



mattysshop
13th January 2006, 12:29 PM
Throttle body upgrade for 4AGZE

How to fit a bigger throttle body to the 4AGZE..as the stock GZE Throttle body is one of the smallest points in the whole system.. at a measly 46mm.. most of the other gear is around 55mm..

benefits..

faster throttle response..
NO hunting idle
More top end power as the tb itself is about 10mm bigger..
Improved acceleration
I can personally say it felt like the car had an extra 10hp under it's belt.. and realy made it good in high speed WOT runs..

Parts needed..
- Toyota 4AGE/3SGE throttle body of your choice.. I used a Gen 1 3SGE one I threw over the fence at the wreckers.. but a normal 4AGE one can be used, and my be easier as the TPS could be the same type. (all the ones I know have the same 4 bolt pattern)
- Dremel or air tool with bits..
- 6mm vaccume hose
- 5mm and 3mm vaccum plug nipple things
- ae82/ae92 (forget which one it was exactly) 6mm switching solenoide off carbon canister (located near the passenger side firewall)
- switch/wiring
- some form of RTV silicone, or a proper trottle body gasket (any 4AGE one will do
- bit of aluminium for a small throttle cable bracket
- 3" 90 deg rubber bend and some hose clamps to suit (most diesel spares places have these)

if you have a front mount on your GZE you might notice it has a bit of a hunting idle sometimes.. this is the Idle speed controller playing up, unsure why, but it has something to do with the extra piping for the front mount.. some may not experience anything.. but want a small power increse anyway..

take your old TB off (4 x 10 or 12mm bolts/studs), trial fit your new bigger T/B to see if the bolt holes are right.. now take your Down pipe that goes into the s/c off.. 1 hose clamp, take the hose off the ABV, and unbolt the down pipe from the manifold..

once this is removed, you will need to buzz out about 2-3mm all the way around enlarging the hole in the plate, as the new T/B butterfly will hit this at full throttle.. give the inside a bit of a clean up.. make sure that there is a smooth transition into the pipe from the TB, doesn't really matter if there is an edge on the back side..

trial fit to see if it goes all well.. leave TB off.. wash out the down pipe with some water/degreeser/carby cleaner, clean the new TB also.. if you have done a RWD conversion you will most likely have blanked off a 5-6mm fitting in the down pipe.. connect your new hose to this, and the large vacuum solenoid off the rolla you pocketed earlier, connect the switch to 12v power to test if it all works.. FYI on should close the valve and off should open the valve, the opposite to the way I would have preffered, but it still works fine none the less.. fit the TPS switch that cam off the old TB if it is different eg (round plug to square plug) if you used a 4AGE TB you might get the same TPS.. and won't need to change, like if you have a square plug 4AGE TPS and your GZE uses the square plug TPS then go for it and plug her in.. if there is a round plugn and a square plug, either change the TPS, or cut and rejoin/solder the TPS that is on the new TB (providing you left it on) in the same wire order you cut them.. which should be the same colour anyway..

fit the new machined out down pipe.. chuck the new gasket/or just a tiny bit of silicone, put the TB on.. have a look at the back, you should be able to make up a pretty simple 90 deg bend from aluminium to mount the cable..onto, do a few tests with another person making sure you get full throttle, you might need to adjust the cable tension (with the nuts).. use the 90 deg rubber bend, to put on top of the new TB, hose clam, and put your 3" pipe that your filter was hanging off (assuming you have something similar to this) into that..

start the car with the vaccume solenoide open, you should hear a loud sucking noise (sounds like a NOS purge, or pressure leak) it should idle quite high.. make sure the car is at full operating temp.. and use the idle screw on the new TB to get it to idle at around 900-1000rpm, give it a few revs, let it come back to idle.. just to check the speed.. if your wondering what the hell the solenoid is for?, that's for cold starts, as it is tuned to idle when warm, it won't idle when it's cold.. this will make it idle perfect.. simply flick it on or flick it off when you need to.. you can drive with it on if you really like.. but once warm will idle just under 2G.. cold should idle round the 900-1000 mark which is spot on.. and no it won't lean out the mixture etc because the TPS isn't seeing accelerator input..the map sensor and O2 sensor make sure of it..

here you can see mine.. with all the gear fitted

.wolfwood
14th January 2006, 02:45 PM
would this only be for s/c 4agze's or would it have the same affect for a 4agze/te?

mattysshop
14th January 2006, 04:26 PM
you wouldn't be using the GZE gey intake setup on a turbo motor full stop, you would be using a 100kw cut n shut, or a AE86 RWD bigport manifold.. both those tb's are around the 55mm mark.. just the GZE one is tiny! http://www.ae86drivingclub.com.au/forums/emoticons/smile.gif

.wolfwood
14th January 2006, 05:49 PM
ahh okay ta man, in not really sure what one im using

ToySprinta
11th July 2006, 01:34 AM
Did you end up hooking the coolant lines up as well?
I just blocked off the solenoid lines, and haven't had any problems...

mattysshop
11th July 2006, 08:43 AM
hell no... i took the cooling lines off even when i had the 4age in there.. i hate the bastards... http://www.ae86drivingclub.com.au/forums/emoticons/smile.gif

fixeruperer
11th July 2006, 09:45 PM
the biggest problem is the inlet pipe that bolts to the inlet manifold its dam tiny cut and shut it and port the hole.

mattysshop
12th July 2006, 08:36 AM
but the butterfly for the GZE throttle body is tiny compared to a 4AGE

ToySprinta
12th July 2006, 11:12 PM
he's talking bout after the charger, just b4 it goes into the engine...

mattysshop
13th July 2006, 08:43 AM
ohh right.. my bad.. yeh that whole factory inlet manifold is gay.. do the best you can with it!

Brenton 86
13th July 2006, 02:44 PM
ohh right.. my bad.. yeh that whole factory inlet manifold is gay.. do the best you can with it![/b]

Word...The more i work on it the more i loose love for the ze, 20v ftw

Jason
13th July 2006, 07:01 PM
FWD bigport inlet FTW http://www.ae86drivingclub.com.au/forums/emoticons/biggrin.gif

Granto
14th August 2006, 04:14 PM
was speakin to someone about this the other day

i didnt realise the gze inlet was smaller than the ae86 rwd one..

fwoar.

why mr toyota why

Adsport
10th September 2006, 12:17 AM
theory to help understand the small size of GZE inlet butterfly: stock cars must meet emmisions and comply with power to weight ratios so that they can be deemed safe and efficient and 'green'. i beleive that they put suck a PEASHOOTER inlet on it to limit power to stay within the classification of the motor in regards to power delivery for the chassis' it was released in.

i did this upgrade a long time ago and have never looked back... i was just in the shed one day and thought "hrm that looks like the right hole spacing on those bolts there....."

Adsport
10th September 2006, 12:21 AM
theory to help understand the small size of GZE inlet butterfly: stock cars must meet emmisions and comply with power to weight ratios so that they can be deemed safe and efficient and 'green'. i beleive that they put suck a PEASHOOTER inlet on it to limit power to stay within the classification of the motor in regards to power delivery for the chassis' it was released in.

i did this upgrade a long time ago and have never looked back... i was just in the shed one day and thought "hrm that looks like the right hole spacing on those bolts there....."[/b]


and FYI you just swap the TPS and locator arm (on inside of TPS) so that the TPS is setup and zero'ed correctly. those who have a SAFC or similar can zero it in by voltage on the readout. ive done 3sge TB swaps on GZE's also, they are harder then the 4ag ones as you have to kind of make the cable fit,aswell as an apater plate cos the physical size of the throttle body is wider and has idle control ports all the way around , they overlap the GZE flange for the throttle. the 4ag one you just move it round a little but you lose your cold idle unless you run the coolant hoses for the wax valve, this also heats up the TB (not ideal)

asher
12th September 2006, 11:07 PM
I have the 55mm throttle body if anybody wants one.

dustyae86
27th September 2006, 02:55 PM
I have the 55mm throttle body if anybody wants one.[/b]


anyone in vic done this who would be interested in lending a hand

DavisJD
27th September 2006, 06:35 PM
dusty il give it a go with you one weekend, you know more of whats going on than me though!

Ive have all the pasrts needed to do it on my spare engine at home, but i cant be stuffed getting a re-tune AGAIN, so i aint doing it for the moment to mine.

But yeh, il be a extra set of hands if you want.

dustyae86
28th September 2006, 02:42 PM
dusty il give it a go with you one weekend, you know more of whats going on than me though!

Ive have all the pasrts needed to do it on my spare engine at home, but i cant be stuffed getting a re-tune AGAIN, so i aint doing it for the moment to mine.

But yeh, il be a extra set of hands if you want.[/b]


yeh i think if i see one in the flesh i could figure it out but reading it all goes straight over my head

LiveToRide
27th December 2006, 12:45 PM
Hey guys, i tried doing this in my corolla and it kept idling like crazy. I was able to fit the 4age t/b, but then what do i do with all the hoses, it wasn't explained. I plugged in the two vacuum hoses, power steering hoses and this one of a brown vsv (I think thats what it is, comes from the s/c) and turned the car on and it idled at 3200rpm, even when it warmed up it still idled up there, so i attached the coolent lines and still the same thing. Idle screw was all the way in as well.

Help needed http://www.ae86drivingclub.com.au/forums/emoticons/sad.gif

Here's a pic of what i did

dustyae86
27th December 2006, 01:33 PM
Hey guys, i tried doing this in my corolla and it kept idling like crazy. I was able to fit the 4age t/b, but then what do i do with all the hoses, it wasn't explained. I plugged in the two vacuum hoses, power steering hoses and this one of a brown vsv (I think thats what it is, comes from the s/c) and turned the car on and it idled at 3200rpm, even when it warmed up it still idled up there, so i attached the coolent lines and still the same thing. Idle screw was all the way in as well.

Help needed http://www.ae86drivingclub.com.au/forums/emoticons/sad.gif

Here's a pic of what i did[/b]


check all your intercooler hose clamps... the same thing happened to me when i replaced the hoses

LiveToRide
27th December 2006, 10:59 PM
<{POST_SNAPBACK}> (index.php?act=findpost&pid=296563)

Hey guys, i tried doing this in my corolla and it kept idling like crazy. I was able to fit the 4age t/b, but then what do i do with all the hoses, it wasn't explained. I plugged in the two vacuum hoses, power steering hoses and this one of a brown vsv (I think thats what it is, comes from the s/c) and turned the car on and it idled at 3200rpm, even when it warmed up it still idled up there, so i attached the coolent lines and still the same thing. Idle screw was all the way in as well.

Help needed http://www.ae86drivingclub.com.au/forums/emoticons/sad.gif

Here's a pic of what i did[/b]


check all your intercooler hose clamps... the same thing happened to me when i replaced the hoses
[/b]

I didnt touch the cooler hoses though, and when i put my old t/b back on all was good again

dustyae86
28th December 2006, 07:32 AM
check for any vaccum leaks or anything like that cause mine did the same kind of thing exactly and it was cause i had a vac leak PM MATTYSHOP he will be abig help

LiveToRide
28th December 2006, 11:05 AM
There was no vacuum leaks, i'm sure. The only thing i didn't do a that point was fit the 4age solenoid to a switch. Is this used to lower the rpm cause i was under the impression is was to help with the cold idle only.

dustyae86
28th December 2006, 11:09 AM
There was no vacuum leaks, i'm sure. The only thing i didn't do a that point was fit the 4age solenoid to a switch. Is this used to lower the rpm cause i was under the impression is was to help with the cold idle only.[/b]

TRY IT AND FIND OUT http://www.ae86drivingclub.com.au/forums/emoticons/tongue.gif

lachy2k3
19th July 2007, 10:07 PM
has anyone done this conversion successfully besides mattyshop?

Justo
21st July 2007, 07:46 PM
loco got it working. and a few other people I know of on another forum have done it.
aparently throttle response is improved and breaths a bit better in the higher rpm.

Brenton 86
19th January 2008, 09:22 PM
attempted this today..... rounded off the pissy little bolts on the downpipe into the s/c GRRRR


Big difference in size between the NA and ZE throttle bodies but!

dustyae86
20th January 2008, 02:19 PM
<div class='quotetop'>QUOTE (Brenton 86 @ Jan 19 2008, 09:22 PM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=471598)</div>
attempted this today..... rounded off the pissy little bolts on the downpipe into the s/c GRRRR


Big difference in size between the NA and ZE throttle bodies but![/b]

got them sitting there ready to go on just haven't gotten around to it since I'm lazy

samuek
12th February 2008, 12:31 AM
hey does any one know if you have to fit the soleniod thing? cause i cbf hahha

ToySprinta
12th February 2008, 12:17 PM
no :)

samuek
13th February 2008, 01:38 PM
i did the TB upgrade and it workied fine appart from the fact that i couldnt fit my intake back on and i had one small vacume leak cause i didnt do the gasket properly... sounded a little different

i also figured out you don't need to make a new acc bracket, use the std one but change the throttle pulley from the gze TB to the age TB... i took some photos... ill upload them later

riojin
19th February 2008, 10:57 PM
could someone please upload some pics of this so i have a better idea of how to do it?

johnocarbone
18th March 2008, 08:18 AM
I found this site http://jared.catspyjamasdesign.com/throttlebody.html with pictures of how to do it and it looks like with the 4A-GE TB you will keep cold idle. I'm planning to try this soon also as I just got a spare intake pipe to enlarge for the bigger TB.

squish
18th March 2008, 04:24 PM
they guy that wrote that up is on twincam.org under the name "TERRA Operative"
funny enough, the thread about the t/b upgrade links to here somewhere...

riojin
18th March 2008, 10:27 PM
<div class='quotetop'>QUOTE (jdm86gtz @ Mar 18 2008, 08:18 AM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=503692)</div>
I found this site http://jared.catspyjamasdesign.com/throttlebody.html with pictures of how to do it and it looks like with the 4A-GE TB you will keep cold idle. I'm planning to try this soon also as I just got a spare intake pipe to enlarge for the bigger TB.[/b]
that link is awesome. i have a good idea of what i will be doing in 4 weeks.

slide86
5th April 2008, 12:55 AM
javal and i (the hektik AJPS crew) have pioneered the 3sge throttle body on a RWD 4age engine. maybe not the pioneers, but ill claim it!

we succesfully ut a 3sge throttle body, TPS, and idle up on a RWD bigport engine.

it started up and ran perfectly.

the only mod i performed was, i took the TPS off and turned it 180 degrees so the plug pointed in the correct position. there were no other mods performed...

Javal
5th April 2008, 10:27 PM
<div class='quotetop'>QUOTE (slide86 @ Apr 5 2008, 12:25 AM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=513422)</div>
javal and i (the hektik AJPS crew) have pioneered the 3sge throttle body on a RWD 4age engine. maybe not the pioneers, but ill claim it!

we succesfully ut a 3sge throttle body, TPS, and idle up on a RWD bigport engine.

it started up and ran perfectly.

the only mod i performed was, i took the TPS off and turned it 180 degrees so the plug pointed in the correct position. there were no other mods performed...[/b]

we now do a kit for them, including the bolts / spacers, vacuum line blockers, and most importantly, a new bracket to relocate the JDM throttle cable.