subaru justy tuning parts
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The
Subaru EF12 engines are equipped
with 66HP or 73HP, not
impressive even for 1987.
Most people would think 'oh,
three cylinder... um... no.'
However, the EF12 in stock EFI
form offered one horsepower per
cubic inch, something that only
the Turbo Subaru engines could
achieve at the time and
something that Detroit had long
forgotten. The EF10 and
EF12 are built rock solid,
tougher than most four
cylinders. They have an
iron block, SOHC aluminum
cylinder head, and a forged
crankshaft from the factory.
The connecting rods feature full
bolts with locknuts and a
full-floating piston design.
A chain-driven counterbalance
shaft helps the inline three
cylinder (nicknamed thumper) run
as smooth as an inline four or
six. They are fully
capable of double the power by
simply adding a turbo, and three
times more with internal
upgrades. How?
If
your engine is EFI then you can
get a turbo, and rig up piping
and go to town. Heater
hoses can be split for water
delivery and an oil filter
relocation kit will provide the
necessary oil to the turbo;
however, the oil feed line will
need to have a restrictor of
some sort and the turbo oil
drain line will have to be near
straight down or slightly angled
to ensure proper oil drain from
the turbo. An intercooler
is not necessary with stock
compression if running under
12psi and a rising-rate fuel
pressure regulator, or larger
injectors and an ECU. If
you have a carburetor you will
have to convert to fuel
injection or rig up a larger
carb in front of the turbo, (an
air-cooled VW turbo kit can be a
good starting point). The
results are usually 130HP @7psi
on stock internals. I
myself or no one I have heard of
has ever run over 15psi, so
upper end is unknown. You
can still build your 150HP+
daily driver on pump gas and
have it last 50,000mi with
common sense and maintenance.
We have built engines to support
over 200HP and offer decent
longevity. We have
estimated the limit
of the EF12 to be around
250HP with what is currently
available. These 200HP+
engines are equipped with an
intercooler and running 15psi
@362cfm, and fully built long
block. We are going to
continue to investigate the
EF12, and hopefully post some
more good news in the future!
Drawbacks:
Expense.
Dusty's Justys offers a few
performance parts, but most
things at this time will still
have to be custom made such as
piping, manifolds, and
electronics. Even if and
when other parts surface the
cost will most likely be high
because of lack of demand.
Luckily most parts are available
already to do an EFI swap, and
the Subaru 1.4L (EA63) shares
the same clutch as the Justy, so
Centerforce makes one to support
200HP. But, one drawback
you will
run into is the transmission.
The ECVT will not
hold up to elevated power, (they
barely hold up stock). The
five-speed will handle
150HP, but not much more.
The synchros and differentials
are weak, and no aftermarket
solutions exist as of yet.
Bottom line is if you want real
power, redlined clutch drops,
and tire smoking performance...
you're gonna pay for it in
transmission rebuilds, (and
probably engine rebuilds too if
you don't know what you are
doing and just slap something
together). We have blown
up test engines and totally
destroyed a few beyond repair in
just testing just to establish
limits and perfect settings.
Please, if you do not know how
to tune an ECU, rebuild an
engine, weld, and a variety of
other skills consult a skilled
technician and/or high
performance shop in your area or
contact us!!!
Addressment:
Balance Shaft.
We have received many questions
about the possible removal of
the balance shaft to gain power
and higher RPM. This topic
has been discussed and explored
on many Chrysler and Mitsubishi
forums in regards to their 2.6L
Astron "Silent-Shaft"
engine and the Chrysler 2.2/2.5L
engines, sparking Subaru owners
to do the same. The answer
is simple, if the shaft is
removed the engine will rev
faster and higher, but runs so
roughly that it will snap a
motor mount, this is also true
if the balance shaft is out of
alignment. After spending
a lot of effort rigging the
chain system and removing the
shaft on a junk engine for quick
testing we have deemed this
modification complete,
utter, and guaranteed suicide.
"But
my friend did it on his 2.6
Conquest and it is faster."
Don't trust those message
boards, and verify the facts.
The Astron has TWIN shafts, one
could be removed with limited
success as the engine would have
some kind of balance but still
run too rough to be safe.
If both shafts were to be
removed, without some kind of
external balance the engine
would fly to pieces, same with
the Chrysler, and the Subaru.
Make sure when servicing that
the timing marks are aligned
with the gold links on the
chain. The chain guide can
also wear and cause the chain to
rattle. When this happens,
the only solution is a new guide
and chain from Subaru....
expensive!
Addressment:
Front Cover.
Yeah, the infamous front cover
problem. The front cover
of the EF12 that holds the oil
pump is notorious for leaking
oil, causing low oil pressure, a
tapping sound at idle, and
finally cracking leading to
engine failure. This
problem is enhanced by a
rattling balance chain. If
you suspect your front cover is
to blame, it probably is.
Two out of three that we receive
used are junk. If you are
rebuilding your engine, you need
to have the front cover
magnafluxed or checked for
cracks. Even the smallest
of micro-fractures will lead to
catastrophic engine failure, and
you're
wasting your time trying to find
good, used one. :-(
The
good news is that we sell
complete front cover kits with
new oil pumps installed!
:-)
Subaru Justy is a subcompact hatchback manufactured by Japanese automaker Subaru division of Fuji Heavy Industries (FHI) from 1984 to 1994; though its rebadged version was sold until 2010. The first Subaru Justy was introduced in Japan in 1984. And its rebadged version was replaced by the Subaru Trezia eventually for the 2010 model year. Though Subaru Justy had been only produced through about twenty years, it still could be seen as two generations according to its gear ratios.The first generation Subaru Justy (1984-1988) was not introduced into the United States until 1987. It was also called as Subaru Trendy in Sweden and as J-series, J10, and J12 in other places. In the United States, Subaru Justy was equipped with the full-wheel drive. Until 1988, the American version Subaru Justy received 4-wheel drive as an option. The second generation Subaru Justy (1989-1994) received a major restyling in 1989. By 1989, all models of Subaru Justy were both available in full-wheel drive and 4-wheel drive. In the two generations, Subaru Justy had been powered by a 1.0 L EF10 inline 3-cylinder and a 1.2 L EF12 inline 3-cylinder engine. And these engines were fitted along with either a 5-speed manual transmission or a Continuously Variable transmission (ECVT).
As a vehicle, once it runs, it is wearing, so is Subaru Justy. In order to slow down the wearing process, you have the need to know about how to diagnose and solve common problems that happen to it in advance:First, suspension failure. Many Subaru Justy owners have complained this problem as it has influenced their driving experience a lot. They told that the grinding or roaring noises would come from the tire area, the front tires and brakes would be damaged severely so that the tire wear would be abnormal and uneven. At the same time, the vibrating steering wheel would make it difficult for them to control the vehicle. So once any above signs appear on your Subaru Justy, you had better get the Justy shock and strut mount and Justy wheel bearing inspected thoroughly.Second, braking system went wrong. Every driver knows the importance of the braking system, so that's why you need to pay more attention on the braking system in your Subaru Justy. According to Subaru Justy owners, the brake pedals would give out an unusual feel as well as abnormal noises; the parking brake would also become loose. If you want to enjoy a safe driving trip and your Subaru Justy also has these symptoms, you can try checking if the brake drum is broken.If you want to lengthen your Subaru Justy's lifespan, then you have a lot more to take good care of. It is an assembled item by many kinds of auto parts after all. In order to save your time and energy, you can focus on some more vulnerable parts in your Subaru Justy. For example, the wiper blade only works under harsh weather conditions such as downpour or snowy, which means the wiper blade is exposed to harm brought by nature all the time. So you had better change it at least once a year if you want your driving vision won't get blocked. Other auto parts including headlights, power window switch, fog lights or antenna also should be on your maintenance list.Our website focuses on providing the lowest-priced OEM Subaru Justy auto parts for customers around the world. That is why we have the vast genuine Subaru Justy parts collection awaits for your selection. All these OEM Justy parts are covered by the manufacturer's warranty, so you can trust them in quality, reliability and durability. What's more, all parts from us are favored by our hassle-free return policy and fastest delivery service. Looking forward to your visiting!
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