Nissan Skyline R32 GTs-4 Turbo AWD Intercooler Upgrade

Nissan Skyline R32 GTs-4 Turbo AWD Intercooler Upgrade

Nissan Skyline HR32 GTS4 Intercooler Upgrade Modification by fitting FMIC from Skyline GTR


Skyline GTS4 AWD


(FMIC in Stealth Mode)


Single Turbo 2Ltr

4 Speed Automatic


First Intake Modification.

ic4.jpg (22991 bytes)

Click on the images to see a larger view

_Nissan_HR32_GTS4_FMIC_01.jpg (152980 bytes)

The Nissan Skyline HR32 GTS 4 AWD
seems very naked about now with everything
removed to explore the options of the Skyline GTR standard Front Mount Inter-Cooler (FMIC)


_Nissan_HR32_GTS4_FMIC_14.jpg (138081 bytes)

The front mounted Nissan Skyline GTR HR33 Intercooler
fitted perfectly into the frontal radiator area with a
bit of massaging with a saw into the plastic
front clip.

There is actually a fair amount of flow up
under the standard bumper bar to the top of the intercooler
as well. That is why I have fixed on a
extended piece of flat Aluminum to ensure
air goes though the FMIC at the top instead
of taking the easy path straight over it.


_Nissan_HR32_GTS4_FMIC_13.jpg (125819 bytes)








I had been to quite a few places to try to
get some “expert” advice on what I should do
to intercool the car for proposed higher
boost as I want to break into the 12’s. The
advice from one shop was to makeup a hybrid
I/C from two smaller coolers and come in the
top and out the bottom and back to the
original piping in the engine bay.

This sounded OK and the price seemed
reasonable around $1800 for the work

BUT every time I called in to see them
they were always too busy to do anything
this week!

So another shop come up with a second
hand cooler from a truck core and piping
at a great price under
a grand so seemed to be a better idea. BUT they were very
busy also! SO what to do…

Then I visited John and saw the GTR
cooler and made an offer of $600.
I kicked my self two weeks later when I
saw another one fully polished and
detailed for $900.

This Intercooler was actually supplied by a
chance visit to see John Martin at  OrienT
Express who had originally sold me the car in

_Nissan_HR32_GTS4_FMIC_02.jpg (113647 bytes)

The original holes for
the two intercooler pipes. The rear hole
usually being for the turbo outlet. In this
mod it will be the front hole used for the
turbo outlet to allow clearance for the

Modified Nissan Skyline Air Flow Meter (AFM ) – (more about the modified AFM here)

_Nissan_HR32_GTS4_FMIC_09.jpg (110379 bytes)

The Stainless Steel pipes and straight
sections I bought locally at about $18 for the
bends and $20 for a metre length.
The hose I bought at a good rate
from the scrap bin. They made up for it on the
fancy clamps which cost about $7 each though they were worth every cent.


_Nissan_HR32_GTS4_FMIC_12.jpg (105860 bytes)

_Nissan_HR32_GTS4_FMIC_18.jpg (134584 bytes)








I am sick of the standard type screwdriver
fastened clamps as they never seem to hold for
long and always come loose.
These clamps do not! Well not until you are in
the middle of nowhere anyway;-)

Like on the return trip from Adelaide
after Martin Donnan Dyno’s the car! Lucky the
clamp was accessible through the front intake
and did not cause too much drama except when
returning to Melbourne on the outskirts and I
had a drag with a Commodore. The boost must have
been leaking previously when Martin Dyno’d it
and set it at 15PSI.

By the way it accelerated and then started
detonating I figured it must be way higher and
when I checked it on the boost gauge ( hidden
under the Ashtray) it was over twenty PSI!

_Nissan_HR32_GTS4_FMIC_19.jpg (167141 bytes)

Tucked tight
under the FMIC outlet pipes is the high volume
oil cooler and 12v fan for those days when the
oil temps may get a bit higher than normal.
The airflow through the front clip side hole
also forces down through it at speed adding to
the cooling effect. This view also shows the custom Oil Cooler system that I
have engineered to reduce engine oil temperatures for the drags and mainly
circuit track days.

_Nissan_HR32_GTS4_FMIC_16.jpg (121002 bytes)

On the passengers side
where the original Side guard mounted
Intercooler was now holds a securely mounted
air conditioning condenser that has a huge
volume and high flow though for the

modified Nissan Auto Trans ( – More Here
to keep the temperatures down when stalling up
the 2800RPM Soderstrom Torque converter at the

_Nissan_RB20DET_AUTO_01.jpg (169444 bytes)

This massive
cooler also gets air coming in the front clip
passenger side entrance duct but is also
assisted by two 12vDC Computer fans for good
measure while stationary at the drags.

_Nissan_HR32_GTS4_FMIC_20.jpg (111752 bytes)

Having driven the Skyline GTs-4 for a few weeks now with the upgraded GT-R FMIC,
the ECU seems to have retuned the Air-Fuel ratio’s to be a
bit leaner and the power has increased with
the boost still set at 10psi. The modified fuel rail and RX7 Fuel Injectors will
certainly be able to cope with any boost increase in the future. It certainly has
made a difference that I was able to detect
while driving out of the garage the first time
after fitment! The revs seemed to build
quicker and the response to the throttle was
much better.

After spirited driving on the turbo a bit I can touch the outlet
side where its very cold while the inlet side
is quite hot as you would expect. From experience the temperatures from the
turbo can be up to 200’c in extreme circumstances so any reduction makes a

By the way anybody out there with an Auto Nissan Skyline GTS, or most Turbo Auto’s
its not so much as a blow off valve on the
intake piping as a BYPASS VALVE!! The function
of this item is to open immediately you push
the throttle to bypass air to get everything
happening quickly. If you don’t believe me
just pinch the vac line (or put in a tap as I
did) and see how much more slower you get off
the line! Its an Automatic remember and you don’t
take your foot of the throttle to change gears
like manual cars do (mostly;-) where you need
to vent boost from slowing the turbo!

course this was not good enough for long,

as I really wanted to get rid of that long pipe and
reduce lag and heat soak!

See what i did
here to totaly modify the Nissan Skyline GTS4 Intake Manifold to front entry reducing the air passage and throttle response!


'82 Mitsubishi Starion Turbo - 91 Mazda Familia Turbo AWD - 91 Nissan Skyline R32 AWD Turbo - 69 AMC Javelin 401 & GMC Supercharger - 72 AMC Javelin


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