RB25 swap over heating issue - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Walperstyle · 05-29-2007, 09:27 PM

Make sure the rad fan is pointing the right way.

If yes, then throw another one on the inside to increase the air. Make sure the fan doesnt cut out on you, i'd keep it on all the time, or wire it on a separate switch if you wanted manual control.

Blackparade · 05-29-2007, 09:43 PM

Griffin radiators are the shit! Defenitly look into that option. Im running a koyo right now due to the fact that it was taking my griifin forever to get here, and my stock rad exploded! grrrrr... had to get something, and every shop i know carries koyos. so....yea. Adress the fan situation!!!!!!!!

LB.Motoring · 05-29-2007, 09:49 PM

my Koyo worked Fine.

Just have a nice pair of fans, and a good shroud,

mine are both custom

moonshinekouki · 05-29-2007, 10:15 PM

any tips on making my own shroud ?
thank you
if worse coems to worse ill invset in a good set of fans even tho i spend like 350 on these fans.

thanks guys keep the oipinions comming in

mikey

bardabe · 05-29-2007, 10:25 PM

Quote:

Originally Posted by moonshinekouki

any tips on making my own shroud ?
thank you
if worse coems to worse ill invset in a good set of fans even tho i spend like 350 on these fans.

thanks guys keep the oipinions comming in

mikey

damn that sucks dude, I spent like 150$ on my fans but they push 2000cfm's each (4000 total) and I'm running a sucky ass S13 KA radiator right now.

soon when i get my job I will pay off robby, get me an S14 ka radiator, and go to home depot and make a write up on how to make some good shrouds, I can;t stress enough what Dave said. Ducting will make the biggest difference.

moonshinekouki · 05-29-2007, 10:31 PM

what kind of fans did u get?
what is need to make the shorouddd
lol HELLLLPP

bardabe · 05-29-2007, 10:42 PM

PM Sent. ha ha RB owners trade secret.

Tenchuu · 05-29-2007, 10:55 PM

yeah i tried some high rated 10" fans with my swap... they didn't work. went with FAL dual pushers with should and it was allot cooler.

and i if you find a place that sells griffin S14 KA radiators be sure to let me know. i think that griffin does 1-2 runs of those radiators a year. and the most i have ever seen them ship to a business if about 5 of them (when i got a hold of the company and tracked down a shipment to a reseller en route).

LB.Motoring · 05-29-2007, 10:59 PM

Just made one from an aluminum sheet,

cut slits, bent it so its like a tray, then cut the 2 large holes for the super CFM fans, and done.

moonshinekouki · 05-29-2007, 11:08 PM

ok im going to try this out

coreansurfer · 05-30-2007, 12:49 AM

add a second relay to the fans, it'll majorly increase their output and help cool your car. that's what i did to my rb25, and i'm still running stock ka radiator.

moonshinekouki · 05-30-2007, 01:48 AM

^^^^
plzzz moreee detail

*MELLO*SOS* · 05-30-2007, 08:48 AM

He is saying to wire your fans properly.... As in, for each fan use thick gauge wire, ~10ga straight off the battery, through a ~20a fuse, through a relay, to the fan motor. Then you wire the relays to be triggered with a manual switch or however you like (ACC relay for on-with-ignition, etc). Make sure your fans are grounded with the same size wire you use to power them with. This will ensure your fans have enough juice for optimum CFM.. But even with proper wiring the fans might still be too small.

How do you have them wired up now? I don't think your wiring is the culprit unless it's some janky ghetto fab.

Step up to some 12s...

Rezlo · 05-30-2007, 04:13 PM

Quote:

Originally Posted by drift freaq

Let me sum it up plain and simple and yes I have tons of experience here.
Get rid of the suck ASS Koyo . They heatsoak after 20 minutes. If your going to go Aluminum get a Griffin or Fluidyne they are much superior to Koyo and do not heatsoak. Plus they run 10 degrees cooler than a Koyo because of better design. Ok I don't want to here arguements about this because I went through it, I know!
Koyo's suck end of story, so no whiny shit from SR owners about how your Koyo works fine. They may work fine with your 2 liter 4 cylinder that does not need as much cooling power, but they are basically a poor design sold cheap. End of story.
Steve and Mello both are correct besides your radiator heatsoak issue you definitely have a CFM issue . Unless those 10's are FAL's they are probably not pushing enough CFM. Dual FAL's are rated at 2500 cfm which would be enough for you. Either uprate your fans or even stick a stock s14 radiator in which is actually large enough with a pair of FAL pullers on the engine side and you would be good.
P.S. Hood vents due help but you you need to address the other issues first.

I run my RB25 in 100degree + South african days for a 60 mile trip to work and back and race it every weekend either drag or drift for extended periods, again in the south african climate, its also rather powerful ( I would like to think so running 11's anyways). I have never ONCE even come close to having dangerous water temps with my koyo, I run a nismo thermo and water pump with 2 CSR 12" fans that kick on at 160deg rad inlet temp, never seen them go over 185, with my old SR20 with its stock SR20 radiator and Nismo pump and thermo it would often go over 200f.

Just before everyone thinks koyo are trash.

moonshinekouki · 05-30-2007, 11:28 PM

^ u mind telling ur coooling set up
like duccts fans w.e ur running?
thanks
mikey

Rezlo · 05-31-2007, 02:03 PM

2X 12" CSR fans on a stainless shroud i made that sits about 10mm from the core,

I use an electronic CSR fan controler to turn the fans on at 165f

Apart from that nothing, i dont have the AC condencer though, but i run a 100mm thick intercooler.

05-29-2007, 09:27 PM	#31
Walperstyle Nissanaholic! Join Date: Nov 2004 Location: Alberta, Red Derp Age: 44 Posts: 1,729 Trader Rating: (0) Feedback Score: 0 reviews	Make sure the rad fan is pointing the right way. If yes, then throw another one on the inside to increase the air. Make sure the fan doesnt cut out on you, i'd keep it on all the time, or wire it on a separate switch if you wanted manual control. __________________ KA-T ORG-Function over Flush

05-29-2007, 09:49 PM	#33
LB.Motoring Post Whore! Join Date: Jul 2006 Location: SòCal♥ Age: 38 Posts: 5,840 Trader Rating: (1) Rides Gallery: LB.Motoring Feedback Score: 1 reviews	my Koyo worked Fine. Just have a nice pair of fans, and a good shroud, mine are both custom __________________ Robby Leuer

05-29-2007, 10:15 PM	#34
moonshinekouki Zilvia Junkie Join Date: Nov 2005 Location: Toronto Posts: 350 Trader Rating: (2) Feedback Score: 2 reviews	any tips on making my own shroud ? thank you if worse coems to worse ill invset in a good set of fans even tho i spend like 350 on these fans. thanks guys keep the oipinions comming in mikey __________________

05-29-2007, 10:31 PM	#36
moonshinekouki Zilvia Junkie Join Date: Nov 2005 Location: Toronto Posts: 350 Trader Rating: (2) Feedback Score: 2 reviews	what kind of fans did u get? what is need to make the shorouddd lol HELLLLPP __________________

05-29-2007, 10:42 PM	#37
bardabe Post Whore! Join Date: Aug 2005 Location: SoCal Age: 35 Posts: 4,719 Trader Rating: (10) Rides Gallery: bardabe Feedback Score: 10 reviews	PM Sent. ha ha RB owners trade secret. __________________ Review Thread

05-29-2007, 09:43 PM	#32
Blackparade Zilvia FREAK! Join Date: Sep 2006 Location: LA Age: 39 Posts: 1,022 Trader Rating: (0) Feedback Score: 0 reviews	Griffin radiators are the shit! Defenitly look into that option. Im running a koyo right now due to the fact that it was taking my griifin forever to get here, and my stock rad exploded! grrrrr... had to get something, and every shop i know carries koyos. so....yea. Adress the fan situation!!!!!!!!

05-29-2007, 10:55 PM	#38
Tenchuu Post Whore! Join Date: Apr 2004 Location: Oregon Age: 42 Posts: 2,474 Trader Rating: (8) Rides Gallery: Tenchuu Feedback Score: 8 reviews	yeah i tried some high rated 10" fans with my swap... they didn't work. went with FAL dual pushers with should and it was allot cooler. and i if you find a place that sells griffin S14 KA radiators be sure to let me know. i think that griffin does 1-2 runs of those radiators a year. and the most i have ever seen them ship to a business if about 5 of them (when i got a hold of the company and tracked down a shipment to a reseller en route).

05-29-2007, 10:59 PM	#39
LB.Motoring Post Whore! Join Date: Jul 2006 Location: SòCal♥ Age: 38 Posts: 5,840 Trader Rating: (1) Rides Gallery: LB.Motoring Feedback Score: 1 reviews	Just made one from an aluminum sheet, cut slits, bent it so its like a tray, then cut the 2 large holes for the super CFM fans, and done. __________________ Robby Leuer

05-29-2007, 11:08 PM	#40
moonshinekouki Zilvia Junkie Join Date: Nov 2005 Location: Toronto Posts: 350 Trader Rating: (2) Feedback Score: 2 reviews	ok im going to try this out __________________

05-30-2007, 01:48 AM	#42
moonshinekouki Zilvia Junkie Join Date: Nov 2005 Location: Toronto Posts: 350 Trader Rating: (2) Feedback Score: 2 reviews	^^^^ plzzz moreee detail __________________

05-30-2007, 08:48 AM	#43
MELLOSOS* LAID OUT Join Date: Mar 2004 Location: LAS VEGAS Age: 43 Posts: 2,015 Trader Rating: (1) Rides Gallery: MELLO*SOS Feedback Score: 1 reviews	He is saying to wire your fans properly.... As in, for each fan use thick gauge wire, ~10ga straight off the battery, through a ~20a fuse, through a relay, to the fan motor. Then you wire the relays to be triggered with a manual switch or however you like (ACC relay for on-with-ignition, etc). Make sure your fans are grounded with the same size wire you use to power them with. This will ensure your fans have enough juice for optimum CFM.. But even with proper wiring the fans might still be too small. How do you have them wired up now? I don't think your wiring is the culprit unless it's some janky ghetto fab. Step up to some 12s...

05-30-2007, 11:28 PM	#45
moonshinekouki Zilvia Junkie Join Date: Nov 2005 Location: Toronto Posts: 350 Trader Rating: (2) Feedback Score: 2 reviews	^ u mind telling ur coooling set up like duccts fans w.e ur running? thanks mikey __________________

05-31-2007, 02:03 PM	#46
Rezlo Zilvia Member Join Date: Jan 2005 Location: Chicago&South Africa Posts: 292 Trader Rating: (0) Feedback Score: 0 reviews	2X 12" CSR fans on a stainless shroud i made that sits about 10mm from the core, I use an electronic CSR fan controler to turn the fans on at 165f Apart from that nothing, i dont have the AC condencer though, but i run a 100mm thick intercooler.