DIY GTM Supercharger Oil Cooler Fan Mount for additional air flow

wind.zero

This applies to the oil cooler supplement for the GTM Supercharger kit where the oil cooler is mounted in the driver side of the front bumper. This does NOT apply to those who are not FI'ed and have their oil cooler mounted in front of the radiator. This DIY is for those who have a FMIC and had to put their oil cooler in a less than desirable mounting location.

This DIY adds a fan to force additional air flow over the oil cooler. I had already vented the fender liner so the hot air can escape. Since I installed a louvered section, the exiting air is forced downward rather than directly towards the tire. GTM also sells a vented fender lining as well, but it does not fit the NISMO version unless they have started selling a NISMO version. EDIT GTM does have a NISMO version, you just request it in the notes on the order.

As with all DIY installs, you are responsible for your own work. This one is not that hard but does involve wiring and the battery. I am not responsible for damage to yourself or your vehicle. As with everything, there are multiple ways of accomplishing the same goal. This is just how I installed mine and is just a rough DIY.

Parts Required

• (1) SPAL VA22-AP11/C-50S * 6.5"S/12V 6.5" Straight Blade Low Profile Fan / 12V Pusher ($85.74)
  EDIT Verified that the 7.5" (1" larger than original fan) will install just fine as well)VA14-AP7/C-34S * 7.5"S/12V
  7.5" Straight Blade Low Profile Fan / 12V Pusher
• (1) SPAL Fan Relay Harness Kit ($43.05)
• (4) Fan Cushion Bracket ($0.95)
• (1) Rocker Switch Full Size ¼” Tabs

Recommended Misc:
Fan mounting brackets and fan strap kit
Fan control temperature switch rather than a rocker switch
Flex nylon wire loom
Various size heat shrink tubing / heat gun

Wiring for the relay (4 wires)

1. Yellow – Fused connection to battery
2. Orange – Ignition source
3. Red – Positive to fan
4. Grey – Either to temperature sensor OR to switch (I used a switch)

Wiring for Fan (2 wires)

1. Red – From the relay
2. Black – Ground

Wiring for the Rocker Switch (2 wires)

1. Grey – From the relay
2. Ground

I was too lazy to remove the front bumper, but it would have been much easier with that piece out of the way. I was able to get my fan mounted by just removing the fender lining and the engine undertray. Since I have the ZSpeed part, I only had to remove the driver side for full access. However, it took a bunch of fiddling to get the fan mounted. In retrospect, I should have just pulled the bumper off.

Short directions
Jack up the car and put on jack stands
Remove the driver side wheel, fender lining, and engine undertray
Remove the front bumper. I did not but would have given me a lot more room to work.
Mount the fan using your choice of brackets
Find a good spot and mount the relay
Wire up the relay including a rocker switch or temperature switch
Test the fan control

Pictures
Picture of the SPAL 6.5" fan


Or you can use the 7.5" version. Comparison of 6.5" and 7.5"


This is the front of the oil cooler and mount spot


EDIT
I replaced my original 6.5" with the 7.5" version


This is the back of the oil cooler


Picture for the relay and wire colors


Photo from Zat_Zuma shows how the fan looks mounted. I could not get a picture because I did not remove the bumper.


Picture showing the rocker switch


Photo of my vented fender lining, here is my DIY on that mod. You can also buy a vented fender lining from GTM now.


Misc
I know that Baer383 used a fan switch from Summit Racing to control his fan.


I bought these pucks and they work perfectly on the Z.


I have not really had a lot driving time to rate the fan but it does push a lot of air over the cooler.

Oil cooling efforts so far:

• 25R thermostatic controlled oil cooler
• GReddy turbo oil pan
• Vented fender liner
• SPAL 6.5" fan mounted to oil cooler

Hopefully someone will find this helpful. Thanks to Zat_Zuma and Baer383 for the tips, help, and some of the pictures.