S14a - RB25.. Cooling help

[Zeldoz]

Some of you may know my RB25 is now installed. Albeit not running as of yet.

Basically I'm now needing to buy an S13 ally rad. I have a fan shroud with twin electric fans. Now, should I use these sat on the back of the radiator between the rad and engine..

As space is tight could I put them on the front of the rad, between the FMIC and the radiator? Or would that not cool enough?

Or, should I try and cut more away from the slam panel and fit the viscous fan instead?

I then worry that either of those won't be enough as these swaps seem to run notoriously hot. I'v bought a T to go into the radiator hose to run to a temperature gauge as an added way of reading temps over the standard clock one.. But, should I be contemplating cutting grills into my bonnet too?

[handsomedez]

I've cut about 60mm out of the slam panel the length of the radiator, and used an R34 GTR alloy rad (think it's the same fitment as R33 GTR). So I've got over an inch clearance between the viscous fan and rad, and got plenty room for twin fans in front with no aircon obviously.

[dannyboi200sx]

I use two Evo 4 fans in front and wired up to run on the fastest setup and can handle a really hot day in traffic no over heating, also can last 5 laps at pod skidding non stop


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[Zeldoz]

I've cut about 60mm out of the slam panel the length of the radiator, and used an R34 GTR alloy rad (think it's the same fitment as R33 GTR). So I've got over an inch clearance between the viscous fan and rad, and got plenty room for twin fans in front with no aircon obviously.

This was what i was contemplating. Trying to cut enough for the viscous fan.. AND have the twin fans mounted on the FRONT of the rad.. just to give me enough...

I use two Evo 4 fans in front and wired up to run on the fastest setup and can handle a really hot day in traffic no over heating, also can last 5 laps at pod skidding non stop


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Can you whatsapp me some engine bay pics??!!

[mattrbs14]

I have driftworks ca18det radiator and two push electric fans no viscous has never given me problems, and that's after hard driving on track


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[fikemoo]

I have no viscous fan. A japspeed s13 radiator and 1 12" (I believe could be 11) fan on the front of the radiator and I have no issues at all

When I say front I mean intercooler side not engine side

[igralec]

I have a "toyosports" S13 alloy rad and twin electric fans mounted on the front, for road driving it's ok (with oil cooler even more so), but for trackdays if i had to do it again, i'd do whatever it takes to keep the viscous fan, my stage 3a SR20 with totally stock cooling ran cooler on track...

[Zeldoz]

I have driftworks ca18det radiator and two push electric fans no viscous has never given me problems, and that's after hard driving on track

Hard driving and she stays cool? How thick is your rad 52mm

I have no viscous fan. A japspeed s13 radiator and 1 12" (I believe could be 11) fan on the front of the radiator and I have no issues at all

When I say front I mean intercooler side not engine side

1 single fan? But is that RB25? or a CA18DET/SR20?

I have a "toyosports" S13 alloy rad and twin electric fans mounted on the front, for road driving it's ok (with oil cooler even more so), but for trackdays if i had to do it again, i'd do whatever it takes to keep the viscous fan, my stage 3a SR20 with totally stock cooling ran cooler on track...

I may try and squeeze 2 fans on the front of the radiator.. and a viscous between the rad and engine.. Im due to have a fiddle tonight and i'll see what i can get away with.

[Pasquill]

I did this with mine, I cut the slam panel and made new lower brackets to push the rad as far forward as I could, I've got a r34gtst rad but r33 gtst fits too with 2 12" fans

[wardy88]

I ran viscous fan on my RB s14a cut into the front panel 30mm iirc

It looked factory how I did it

[fikemoo]

No that's a rb25 in a s13 running a big single turbo top mount. Wastegate screamer pipe etc all under the bonnet lol

I do however have my ecu controlling the fan

[Skyline boy]

Dude, you won't need a viscous fan and a twin electric one, most of the guys running rb25 I skylines have either or. In my skyline I had the viscous fan as electrics weren't a strong point in the car, so let the engine do the work. As room is tight, just use the twin electric fans.

I'm assuming u have gotten rid of AC and the associated parts?

[Zeldoz]

Dude, you won't need a viscous fan and a twin electric one, most of the guys running rb25 I skylines have either or. In my skyline I had the viscous fan as electrics weren't a strong point in the car, so let the engine do the work. As room is tight, just use the twin electric fans.

I'm assuming u have gotten rid of AC and the associated parts?

AC gone... ABS staying put i think..

I just dont know where would be best to mount the twin fans.. front.. or back of rad?

[Skyline boy]

On the back, at least it will get some air from the front(although not much if your drifting),