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AVO 420 TURBO INSTALL
slightly modified to clear the smog-pump tubing on
the back of the head.
also note that these turbos will work with the
new 2008 Impreza as it shares the same intercooler
and turbo setup as the Legacy Gt.
Our results with this turbo are a bit mixed.
While this turbo does make good power, it falls
a bit short of expectations, especially when compared
with Mitsubishi turbos of similar size,
namely the tD05 18G. secondly, we found spool
to be an issue. since the aVO 420 uses a larger hot
side with a smaller compressor, it takes a while for
1. To get to the turbo the intercooler must first be unbolted.
Undo the hose clamps at the throttle body, unbolt the mounting
bracket and then unbolt the intercooler from the turbo and then
pull it free.
4. Unbolt the downpipe. The Perrin pipe has two sections making
it easier to remove. You will also have to unbolt the lower turbo
studs from underneath the car.
7. Unbolt the other side of the oil feed line. Since the line is rigid,
it helps to completely remove it to ease turbo removal.
66 July 2008
the turbo to come up to boost. We did not hit peak
boost until 4,000rpm.
“The car is a blast to drive. The only problem is
with the power being so far up the tach, I usually run
out of road before I really get into it,” said subiesport
publisher Ryan Douthit. “I think it’s a turbo that is
best suited for track applications and may do better
with higher octane fuels than what we can find on
the corner here in the United states.”
While the aVO may not rock the house in the
power or spool department, it makes up for this
somewhat in ease of installation and longevity.
2. With the intercooler removed you now have easy access to the
turbo. Unbolt the oil feed line (top bolt with red mark underneath
the turbo outlet) and undo the downpipe.
5. If you want to be clean and enviromentally friendly, drain your
coolant as you will have to remove the coolant lines from the
turbo.
8. Unbolt the turbo from the uppipe. Heat and corrosion can
bake the studs to the nuts, make sure you can apply the proper
amount of leverage.
aVO claims that, thanks to its larger turbine housing,
Garrett ball-bearing center sections and superior
grade of construction materials, this turbo will
outlive our car, or at least live as long as we own the
car. This is important when considering that some
journal-bearing turbos may live very short lives indeed
of around 30,000 miles or less, depending on
how hard you push your turbo.
to have our aVO 420 installed, we turned to
IPD/Rallitek in Portland, Ore. to see a short video of
this installation complete with helpful installation
hints, go to www.subiesport.com.
3. You will have to get underneath the car to remove the downpipe
and drain fluids. First, remove the splash tray.
6. Use a pair of pliers to undo these spring clips which clamp the
coolant lines onto the turbo.
9. Make sure you have a place to keep your hardware. This
colander is a great way to keep you bolts from going astray.