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The stock air box is good but it is a PITA to remove,
and about everything you do requires you to remove it. Plus, when
you start to upgrade it will start to be an airflow restriction.
So replacing it with one of the after-market ones is a good performance
mod. The only down point is that now you are pulling in warmer
air from the engine compartment. This can be solved with a custom
made box, but I am not worrying about that at this point. Also
after you install it you can now hear the sucking sound of the
air and your BOV when it vents, woooosh. Which is both cool sounding
and a good way to tell if it is stuck open or close. If it is
stuck open you will leak boost pressure, if it is stuck close
you can destroy many expensive things when the pressure wave from
the throttle plate closing under boost hits the intake turbine.
This install should take about 45 minutes if you don't have trouble
getting the accordion hose off. After that it is easy. There are
many different brands of filters, HKS and K&N. I don't like
HKS because it seemed to be a low quality wet-style filter and
tested very poorly in a test
done in Japan. The K&N is the most popular among Supra
owners and tested well, but I choose the APEXi because it tested
the best and I got a good deal on a new one.
| Tools: |
Phillips Screwdriver |
| |
10mm Box Wrench |
| |
10mm Socket Wrench |
| |
Pliers |
Part Number Reference Chart
| Toyota Part |
Part Number |
Description |
| Air Cleaner Hose |
17882-42012 |
Accordion Pipe |
| Ventilation Hose #4 |
12264-42010 |
Short hose to PCV system |
| Air Hose #2 (for ISC valve) |
17348-42010 |
Long hose from Accordion Pipe |
| Auxiliary Air Valve |
17670-42010 |
BOV |
| Auxiliary Air Valve Hose #1 |
17341-42070 |
BOV to 3000 Pipe Hose |
| Auxiliary Air Valve Hose #2 |
17342-42040 |
BOV to Accordion Pipe Hose |
| Auxiliary Air Valve Hose #3 |
90445-10022 |
BOV Vacuum Hose |
| Hose #1 (for Idle-up) |
90910-05186 |
Vacuum hose on bottom of Accordion |
| Air Flow Meter Gasket |
22275-42020 |
Rubber Gasket at front of AFM |
Teardown
| 1. |
Using a 10mm socket wrench loosen the
hose clamps at the 3000 Pipe and fender connections. Remove
as one big piece.
|
| 2. |
Remove the upper IC hoses. |
| 3. |
Remove the two 10mm bolts that hold the front air box to the frame. |
| 4. |
Remove the 10mm bolt that connects to the brace off the AFM. |
| 5. |
Disconnect the AFM electrical connector. |
| 6. |
Using the wrench to first move the hose clamps, then disconnect the 3 air pipes to the accordion pipe. |
| 7. |
Loosen the Phillips screws for 2 hose clamps on the accordion hose. |
| 8. |
Push the front of the air box towards the front
of the car then compress and pull back the accordion hose
until you can slip the rear side of air box up past the front
part.
|
| 9. |
Disconnect the PS vacuum hose on the bottom of the accordion pipe. |
| 10. |
Pull the Accordion hose off the turbo. |
| 11. |
Remove accordion hose and rear air box as one piece. |
| 12. |
Remove the front air box. |
| 13. |
Separate accordion hose from AFM body. |
| 14. |
Inside the rear air box, pry back the tabs on the lock plate that cover the 4 brass bolts. |
| 15. |
Using the 10mm socket wrench remove these 4 bolts. |
| 16. |
Remove the lock plates and the brass air cleaner cover. |
| 17. |
Now carefully separate the rear air box from
the AFM. There is a rubber gasket in between. Mine was stuck
together so be careful when pulling apart that you don't throw
a piece across the room.
|
While you are here
| 1. |
Accordion Hose
After years of being in the engine the accordion hose can
get brittle and cracked. Especially with the stress it takes
being put on when you still have the stock turbo. The good
news is that I found it was only $30 to replace. So even if
yours isn't cracked, if it is old now is a good time to replace it.
|
| 2. |
Accordion Hose Air Hoses
The various air hoses, 3 of then, that come off the accordion
hose get very hard in there old age. The one to my BOV had
to be chiseled off after 12 years. It makes life much easier,
to take them on and off, if you replace them with soft versions.
You can either get them at Toyota, for about $20 each, or
go to your local auto parts store and find something similar.
|
| 3. |
Accordion Hose Vacuum Hose
I found that this little hose was also a PITA. It was hardened
and too difficult to remove so I just cut it off. It would
probably be easier to just cut it, instead of removing it,
and replace it at this time. It is just a simple bit of
vacuum tubing so is less than a buck.
|
| 4. |
BOV
While things are off your car take your BOV and see if you
can blow through it. If you can it is, like mine was, toast
and is leaking your boost. You can buy the one from Toyota
but those are expensive. There are two other options that
I know of which are to use the BOV from a SAAB or Porsche
and are $25-$30. There is a SOGI
tip on installing them, as well as one from my
own install. This can be done at another time because
the BOV is easy to remove.
|
Assembly
| 1. |
Attach APEXi filter to APEXi supplied housing.
Using the four supplied bolts, I didn't use the extra supporting
bracket that they supplied, place the blue gasket between
the filter and the housing and lightly tighten the screws
in the holes. Then slowly going around tighten down the screws
until they are snug. There is no specific direction at this
point, but if you care the APEX stamped portion will be facing
up-ish after you are all finished.
|
| 2. |
Put the rubber gasket back on the AFM if is not already
there. Mine was still soft after all this time, so if you
don't rip it taking it off, you really don't need to replace
it.
|
| 3. |
Attach APEXi housing to AFM
Place the air filter section on the AFM with the word "APEXi"
on the housing on the same side as the AFM electronics box.
Using four of the supplied nuts loosely tighten down the housing
no the bolt studs. Now using the 10mm box wrench go around
tightening down on the bolts until they are all snug.
|
Reinstall
| 1. |
Place the accordion hose back on the turbo. |
| 2. |
Reattach the 3 air hoses on the accordion pipe
and use the pliers to secure their hose clamps.
|
| 3. |
Reattach the vacuum hose to the bottom of the accordion pipe. |
| 4. |
Put the air filter/AFM assembly in filter first
then slip the accordion hose over the AFM.
|
| 5. |
Bolt the AFM bracket back to the body with a 10mm wrench. |
| 6. |
Tighten the two hose clamps on the accordion
pipe with the Phillips screwdriver.
|
| 7. |
Reattach the electric connector to the AFM box. |
|
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