RB25DET cooling upgrades? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Almosttt · 03-31-2018, 06:42 PM

Hey guys, just bought a RB25DET swapped S14 last week. It has stock turbo and injectors etc. but I want to focus on cooling before I start on any of that. It currently has the stock S14 radiator and stock belt driven fan so I figure I should upgrade those first.

What is a good radiator/electric fan combo that should be pretty easy to swap in? What other cooling upgrades should I go for?

This is my first RB25 and first swapped vehicle so this is going to be a bit of a learning experience. Appreciate any help!

nisileighty · 03-31-2018, 06:43 PM

Big aluminum radiator and keep the stock fan. Electric fans will never beat the clutch fan.

Almosttt · 03-31-2018, 06:48 PM

Quote:

Originally Posted by nisileighty

Big aluminum radiator and keep the stock fan. Electric fans will never beat the clutch fan.

Someone mentioned I'd probably have clearance issues if I kept the stock fan? I haven't actually done any measurements though I was just going off of that so I thought I'd have to switch to like dual electric fans or something. I'll try to get measurements for a bigger aluminum one and see if it will fit I guess. Thanks.

nisileighty · 03-31-2018, 06:50 PM

Never ran into cooling issues. Will help a lot to remove your oil warmer underneath the plenum. Oil temps stay below 160F and water temps stay below 76c.

Almosttt · 03-31-2018, 06:58 PM

Quote:

Originally Posted by nisileighty

Never ran into cooling issues. Will help a lot to remove your oil warmer underneath the plenum. Oil temps stay below 160F and water temps stay below 76c.

Damn, looks like a perfect fit. I wish my engine bay looked that good, mine is pretty damn ugly lol. What fan is that?

nisileighty · 03-31-2018, 07:01 PM

It’s stock fan clutch with a GKtech 10 blade fan.

Almosttt · 03-31-2018, 07:08 PM

Quote:

Originally Posted by nisileighty

It’s stock fan clutch with a GKtech 10 blade fan.

Looks good. And what radiator is that? Or what are the dimensions?

nisileighty · 03-31-2018, 07:11 PM

Just some thick aluminum KA radiator. Probably 2-2.5 inch thick

Almosttt · 03-31-2018, 07:29 PM

Quote:

Originally Posted by nisileighty

Just some thick aluminum KA radiator. Probably 2-2.5 inch thick

Okay cool, I'll go ahead and just order a radiator and that fan then... do you have any other cooling upgrades done?

nisileighty · 03-31-2018, 07:32 PM

For the most part, no.

feito · 03-31-2018, 08:00 PM

Stock clutch fan. It just has to be mounted on the oposite side of the clutch and shaved slightly to clear the damper. When i upgraded to a koyo performance radiator, i had to modify the radiator bottom brackets to make them shorter to move the radiator closer to the condenser. That and elongating the screw holes on the upper radiator brackets gave me just enough clearance (less than .25" on the upper tank) for the fan to clear. Motor only mover side to side so any clearance should be gtg.
I wouldnt recommend removing the oil warmer. I do believe it also helps maintain the oil temps down.
I'll share some pix later.

Only picture I have atm

dreaMervaj · 04-06-2018, 06:30 AM

Quote:

Originally Posted by nisileighty

Never ran into cooling issues. Will help a lot to remove your oil warmer underneath the plenum. Oil temps stay below 160F and water temps stay below 76c.

Man this is a tight fit.. How did you get the fan on? Was it installed prior to installing the radiator? What motor mounts are you using?

nisileighty · 04-06-2018, 09:31 AM

Quote:

Originally Posted by dreaMervaj

Man this is a tight fit.. How did you get the fan on? Was it installed prior to installing the radiator? What motor mounts are you using?

Yep, fan went on the backside of the clutch, bolted to the pulley, then the radiator was installed. The mounts are custom made by me, intentionally to mount as far back as possible. There’s less than a centimeter between the firewall and the back of the head.

tuzzio · 04-06-2018, 10:03 AM

Some people will notch the upper radiator support to tilt the radiator forward and make new bracket holes. If you take your time it actually can come out quite nicely.

Wish there was more info on clutch fan CFM ratings. Derale makes fans that pull 4,000CFMs and work stout.

Although, controlling E-fans without a standalone is kind've a nitemare IMO. If you can stick with a clutch fan, do it.

smoked240 · 04-07-2018, 10:12 AM

Quote:

Originally Posted by tuzzio

Some people will notch the upper radiator support to tilt the radiator forward and make new bracket holes. If you take your time it actually can come out quite nicely.

Wish there was more info on clutch fan CFM ratings. Derale makes fans that pull 4,000CFMs and work stout.

Although, controlling E-fans without a standalone is kind've a nitemare IMO. If you can stick with a clutch fan, do it.

I never thought to run fans through the aem! I just run them to a relayed switch and flip them on in traffic or if temps get high.

03-31-2018, 06:42 PM	#1
Almosttt Leaky Injector Join Date: Nov 2011 Location: GA Age: 32 Posts: 92 Trader Rating: (0) Feedback Score: 0 reviews	RB25DET cooling upgrades? Hey guys, just bought a RB25DET swapped S14 last week. It has stock turbo and injectors etc. but I want to focus on cooling before I start on any of that. It currently has the stock S14 radiator and stock belt driven fan so I figure I should upgrade those first. What is a good radiator/electric fan combo that should be pretty easy to swap in? What other cooling upgrades should I go for? This is my first RB25 and first swapped vehicle so this is going to be a bit of a learning experience. Appreciate any help!

03-31-2018, 06:50 PM	#4
nisileighty Zilvia FREAK! Join Date: Feb 2016 Location: Seattle, WA Posts: 1,218 Trader Rating: (4) Feedback Score: 4 reviews	RB25DET cooling upgrades? Never ran into cooling issues. Will help a lot to remove your oil warmer underneath the plenum. Oil temps stay below 160F and water temps stay below 76c.

03-31-2018, 08:00 PM	#11
feito Nissanaholic! Join Date: May 2007 Location: Texas Posts: 1,999 Trader Rating: (1) Feedback Score: 1 reviews	Stock clutch fan. It just has to be mounted on the oposite side of the clutch and shaved slightly to clear the damper. When i upgraded to a koyo performance radiator, i had to modify the radiator bottom brackets to make them shorter to move the radiator closer to the condenser. That and elongating the screw holes on the upper radiator brackets gave me just enough clearance (less than .25" on the upper tank) for the fan to clear. Motor only mover side to side so any clearance should be gtg. I wouldnt recommend removing the oil warmer. I do believe it also helps maintain the oil temps down. I'll share some pix later. Only picture I have atm __________________ Tuners are big bullies

03-31-2018, 06:43 PM	#2
nisileighty Zilvia FREAK! Join Date: Feb 2016 Location: Seattle, WA Posts: 1,218 Trader Rating: (4) Feedback Score: 4 reviews	Big aluminum radiator and keep the stock fan. Electric fans will never beat the clutch fan.

03-31-2018, 07:01 PM	#6
nisileighty Zilvia FREAK! Join Date: Feb 2016 Location: Seattle, WA Posts: 1,218 Trader Rating: (4) Feedback Score: 4 reviews	It’s stock fan clutch with a GKtech 10 blade fan.

03-31-2018, 07:11 PM	#8
nisileighty Zilvia FREAK! Join Date: Feb 2016 Location: Seattle, WA Posts: 1,218 Trader Rating: (4) Feedback Score: 4 reviews	Just some thick aluminum KA radiator. Probably 2-2.5 inch thick

03-31-2018, 07:32 PM	#10
nisileighty Zilvia FREAK! Join Date: Feb 2016 Location: Seattle, WA Posts: 1,218 Trader Rating: (4) Feedback Score: 4 reviews	For the most part, no.

04-06-2018, 10:03 AM	#14
tuzzio Post Whore! Join Date: Oct 2013 Location: Western Mass. Posts: 2,604 Trader Rating: (3) Feedback Score: 3 reviews	Some people will notch the upper radiator support to tilt the radiator forward and make new bracket holes. If you take your time it actually can come out quite nicely. Wish there was more info on clutch fan CFM ratings. Derale makes fans that pull 4,000CFMs and work stout. Although, controlling E-fans without a standalone is kind've a nitemare IMO. If you can stick with a clutch fan, do it.