RB26 Getting to hot, Post your cooling setup

[ghost_22_47]

I am having cooling issues with my RB26 Freshly swapped into my 93 240sx Vert. I am running stock twins not a single. I think I need to open the bump and get some flow into the engine bay, but I am curious as to what everyone else has for a setup to keep their single or twin setup cool. Here are some pics everything is kinda shoved into the center blocking the radiator.

Oil cooler down below, Power steering cooler in the center, Intercooler in front, and the readiator way behind all of it.






Motor

[whoareu]

yea, ive been having heating issues with mine as well,your rad looks smaller than mine though, but im running a 70degree thermostat, aluminum rad, samco hoses, fal 220's (pushers), new ecu temp sensor, autometer gauge, hood spacers, and holes in bumper right above support with a cooling panel to direct airflow, also running distilled water and 3 bottles water wetter. my intercooler takes up all my front so i get no airflow to my radiator which is my problem. mine is odd, it runns fine in city, its the highway where it starts climbing, usually runs around 195 on the highway, between 170-180 in stop and go. and im running a custom gatorade overflow. lol.

[whoareu]

i see in your pic you have a breather tank, it should be mounted higher than everything else coolant related. also make sure you bleed the system really good, do you have a fan setup?

[Yellow4g63]

Could be that the tank is setup right too.

[ghost_22_47]

Yours is still cooler than mine. Mine is running 180-190 then on the highway it's 200-210 I really hope this thing doesn't really get F'ed up.

[mrflip69]

Move the crap in front of your radiator to the side somewhere. I didn't have a heat problem, and when I had an oil cooler installed (in front of radiator), I started to have problems with heatsoak.

[Genpac]

Why is there a big gap between your radiator and the radiator support? That should be tight up against it. The factory used an closed cell foam to keep the metal on metal abrasion down and keep the airflow going into the radiator and not past it.

pic:

[Count Zero]

I agree with above: Get a deflector on the top or get it closer...you're losing a lot of airflow because it'll follow least resistance and go up over the rad instead of through it.

But that definitely is a much smaller radiator than stock Skyline ones. It's a little thicker than stock (like my Koyo), but WAY narrow. Look at the pic just above, in Genpac's post. The R-chassis radiator has a good 2 to 3 inches more than yours on either side.
With the way RB motors run hot, that probably makes a huge difference in keeping it down to proper temps.

[raremotive]

^ I agree with duct work, air is lazy it travels where the least resistance. Duct work will force the air through your rad.

[whoareu]

i used sound deadening to prevent air escapeing between the rad and support. i also agree you should move the oil cooler down to one of the lower left or right vents. also i dont see any fans. 210 would definatly worry me. i would run it at 210 but i would probably never remove my eyes from the gauge. 220 is a no no.

things you could/should do.
1 fans if you dont have them
2 duct work
3 lower thermostat
4 do another cooling system flush.

do you have coolant in your overflow tank. if you dont, you should

[meet07]

I picked up some black semi flimsy floor matte material at home depot. I sealed off both side of the intercooler/raditor and the bottom as well. Seemed to help but then again im running a nismo thermostat,220 pullers and some dual core ebay radiator.

[SlowKoop]

I have fal 220 pullers mishimoto rad, knock of oil cooler routed under head lights, and pbm hood spacers keeps the temps way down. The biggest thing I did was cut 4 3in holes across my bumper that dropped temps alot.

[Genpac]

I have fal 220 pullers mishimoto rad, knock of oil cooler routed under head lights, and pbm hood spacers keeps the temps way down. The biggest thing I did was cut 4 3in holes across my bumper that dropped temps alot.

You have an RB and was able to fit twin pullers? Did you modify the firewall and set the motor back? Pics of holes in bumper, please.

Getting the right combination of coolant, water and additives is important as well. I found success in 15-20% coolant, distilled water and 1 bottle of redline water wetter. Whereas, a 50/50 mix of coolant and distilled water would creep above the temp the T-stat opens on the highway.

I fought high temps when I picked up my RB swapped 'vert. When it's 115-120 here in Vegas, you need to have your cooling system right, or you won't get far.

[stevespeed]

With my RB25 S13, I am running a Mckinney Koyo, with 1 pusher, 1 puller (both 12 inch ISIS) fans, and my reference for my temps is at the intake mainfold (Greddy intake), with a factory Overflow and the intercooler is not.. totally... blocking the radiator.

I vented my hoood, and sealed up the rad along with cutting the bumper up ALOT (looks pretty good too honestly)

I have the stock oil cooler still and a Nismo Cap with a Z32 180 Degree tstat

I run around 180-190 at night time, and 210 during the day when its REALLY hot out with lots of boosting.

My problem though Is I know its heat soak I just got to much crap under that hood. My piping is always HOT as hell

[FAST-DATSUN]

STEVESPEED call me about your heat soaking problems.. Mack

[stevespeed]

Will Do Mack, Its not a problem with your rad though, I am sure of it, its a problem with the rest of my setup being jank as hell.

The rad's the shinest thing on the whole car

[raremotive]

Also having the power steering and oil cooler in front of the radiator impedes flow and they're also heating up the air before it passes the radiator, plus their radiated heat. Those two combined makes the radiator less effective in cooling your engine. Also increasing efficiency flow, it will help the intercooling.

Best to relocate them to the side, because you need that space after the intercooler to let the air cool down as it expands, and it's volume of radiated heat will have reduced effect on the radiator.

[julio]

post4702206.html?hilit=rb%20radiator%20fan#p4702206

[ghost_22_47]

It's not super pretty but it dropped my temp down from 220 to 160-190

2 R32 N1 Carbon Fiber vents and one huge cut out the bumper for the radiator, next I will move the oil cooler when I get a chance and make room by the IC piping.

[l0nestar]

Holy CRAP that is a Gi-normous and overkill cooler for your Power Steering!

[s13drifter88]

i have my oil cooler in the passenger side fender-well (covered/protected from tire) like sidemount would be in our drivers side. i already had an intercooler in front of my radiator so i didnt want to obstruct it with anything else but u could try moving some things like oil cooler to one fender-well and power steering cooler to the other (if theyll fit of coarse).

[SlowKoop]

I didnt modify the fire wall i cut the radiator support ill get picks when i get home tonight. I was having trouble keeping cool with the s13 bumper the suck at letting air in. So we took a hole saw to it, that eliminated any overheating at 60mph and up. I want to make a aluminum templet like the hondas have on there rear bumpers for it.

[Darius]

ghost, what are you using for fans?

[flatrate]

How many people have working AC? my car overheats on an 80 degree day with the AC on, its fine when its off, i have 1 12inch puller fan and 1 12inch pusher fan, just some cheaper zip tie to radiator ones.... using CX racing radiator, s*** irritating

[s13drifter88]

mine used to overheat with the ac on too till i got a CX radiator and im only running 1 16" advance auto parts puller. it stopped after i got the radiator but then i removed my ac coz my condensor started leaking and i didnt wanna mess with it

[s13drifter88]

well i did replace my waterpump too when i put in the radiator so that may have helped it too but idk coz i did it at the same time

[ghost_22_47]

ghost, what are you using for fans?

I am running 2 12" Mishimoto Pushers.

At some point I'll throw it on the lift and move the oil cooler to the passanger side.