Normal Operating Temperature for RB25DET

[krayton]

damn you all run super duper cold.

when i ran stock oil cooler id stop drifting at 110C or 230F

after some cooling mods and ish ive gotten it to 194F idle....188 drifting o_O

[Neejay]

I read the thread and it didnt really have too many people going against itjust that there were other ways to keep temps down. Which for me are not working. I will be using an additive, making a shroud, and potentially getting bigger fans. On top of that bleeding the system.

Like the thread says I crammed a big motor into a bay that was not supposed ot have it not to mention have a restrictive front end when it comes to air passing through.

Well, I made that thread based on all the threads that recommended not to run the Nismo thermostat for a street driven car BUT I was wondering if that was for a stock R33 or, like I said, did that apply to swapped RBs. Now you've got me thinking about switching to the Nismo thermostat too...

[streeteg]

Ya give nthe fact that my Bay is almost totally enclosed given the body work on the front end/ no ducting in the bay, and overall changed characteristics of the air flow, it cant hurt. Not to mention that its a weekend car for the strip (eventually) and some fun runs and cruises throughout the backroads of NJ/PA. so its going to see non daily driver stress on it. Not in High RPMs all the time but enough to where I want to make sure that I am giving it the appropriate cooling it needs.

My car is the Z in the front-- runnign a little hot with my current setup, the skyline behind me is a 26 that has the clutch fan on a shrouded stock R33 radiator and he never goes above 81-82 celsius. He runs stock thermo as well.

[Neejay]

Ya give nthe fact that my Bay is almost totally enclosed given the body work on the front end/ no ducting in the bay, and overall changed characteristics of the air flow, it cant hurt. Not to mention that its a weekend car for the strip (eventually) and some fun runs and cruises throughout the backroads of NJ/PA. so its going to see non daily driver stress on it. Not in High RPMs all the time but enough to where I want to make sure that I am giving it the appropriate cooling it needs.

My car is the Z in the front-- runnign a little hot with my current setup, the skyline behind me is a 26 that has the clutch fan on a shrouded stock R33 radiator and he never goes above 81-82 celsius. He runs stock thermo as well.

Very, very good points...I guess alternate methods are a must. My car is a weekend "warrior" too. I don't daily it. I don't know why I didn't think of all this a month ago when I posted it.

[Thanielson]

That is accurety

i'd check the accuracy of your gauge

the gauge is accurate I have 2 gauges stock ecu reading on the out coming water and a blitz water temp gauge both read the same.

[streeteg]

And so it starts..... hopefully after all said and done ill get the temps down.

[s14_sport]

Be careful when using the nismo T-stat. I was having issues with my cooling. I was getting just as hot as you are so I decided to do a BUNCH of mods all at once. I did the nismo T-stat, coolant flush, custom Griffin radiator and I went from FAL 220 eFans BACK to the Stock Clutch fan with no shroud.

My motor had so much cooling that it never even got to normal operating temp. Would stay around 67C forever at idle, no more then 70C driving around and hard pulls. So I had to take off the Nismo T-stat and replaced it with a stock one...now I stay around 78C* idle and never more then around 85C or so on a hot day doing pulls on the highway.

[Neejay]

And so it starts..... hopefully after all said and done ill get the temps down.

Keep us updated!

What's the outside temp there?

[streeteg]

nearing 95 degrees. Showers here and there. Waiting for the thermostat to come in and then I gotta do the flush. We will see

[Imissmyturbo]

When I had my rb25 it would stay around 90-95 in the summer and 85-88 in the winter. I didn't get worried till I saw the temp go above 106c thats when my skyline clusters temp gauge started to climp up. It would mean it's time to take it easy and keep moving. You won't hurt anything at that point from the temps alone but you dont' want to be under boost at that point. On my 2jz motor I see my coolent temps around 200f-209f. If it goes above 225 my haltech starts flashing a warning. Some cars don't have there fans come on untill 230f But when you are dealing with high boost high hp setups you don't want that extra heat.

[Neejay]

updates?

[streeteg]

Wekll the nismo thermo arrived, but I think the problem lies within my fans. I am not sure I am gonna want to do the thermo cause once the winter rolls around it might be too much. I am going to order a fal 160 fan 300cfm which should do the trick before i go ahead with the thermostat. That and some water wetter shoujdl get me to where I hsould be

[sr20tom]

i think you should just sell the car and call it a day!

[streeteg]

5 posts and this is all you have to say haha---your lucky you helped me with the diff and brakes....

[USMCgetsome]

seen this whip on hybridz loved it since then. Anyhow, i know darn well you got plenty of space in there for a great fan setup. As stated before altima fans or fal fans something shrouded!

[streeteg]

Fal 160 puller is on its way! Stay tuned---

-E

[USMCgetsome]

[meet07]

I did a coolant flush with the vehicle off last week and added some water wetter. Now my car is trying to creep above 210 F at idle??? It never did this before??? I was thinking that it had an air pocket so I left it running with the front end up in the air. The stock thermo opened up like 3 times but im still have an over heatting issue...only at idle??

When my temp creeps above 210 the idle automatically rises??? what is that???

[S14-NEO]

it sounds like you have an air pocket but this new fan you got could and i "could" be moving air the wrong way...how many fans do you have on your setup now?....and im just curious, why didnt you just go with a set of FAL dual fans like a 240 puller style series like alot of other people such as myself if that is the case. they work great. you really should have a fan setup that covers most of the radiator core if not all of it.

[USMCgetsome]

it also helps when you put the a/c system all the way on hot with the fan at the 4 settting. helps to cycle through the heater core.

does your radiator always show full when the radiator cap is removed? btw i had the same issue for a few weeks untill i re-bled the system car in the air and spent 3hrs of running the motor, let it cool down and top it off a lil bit at a time. been running fine now for a few months. I run 50/50 and 2 bottles of water wetter

[l0nestar]

I did a coolant flush with the vehicle off last week and added some water wetter. Now my car is trying to creep above 210 F at idle??? It never did this before??? I was thinking that it had an air pocket so I left it running with the front end up in the air. The stock thermo opened up like 3 times but im still have an over heatting issue...only at idle??

When my temp creeps above 210 the idle automatically rises??? what is that???

Meet, what is the condition of your radiator? How much rust was flushed out?

[Bluefire]

Previous RB25 I built was running a solid 85c in the middle of a california summer. It had a griffin dual pass radiator, two 11" spal pullers, nismo thermo, and stock waterpump.

[streeteg]

Turns out my entire issue was my womp-o-crap fans. Replaced the 2 for 1 Flexalite black magic 160 and my temps dont go a hair above 185. Tomorrow morning a quick flush of some of the coolant in exchange for water + water wetter I think I will be able to forget about the nismo thermostat all togheter. (Sweet)

Anyway--- Maybe Ill save itfor summers and run a stocker for the winter-- but who cares I'm just happy my temps are under control!!

[meet07]

Its a cxracing radiator that was purchased about a year ago. I flushed it yesterday and it didnt have any rust in it. I also checked the water pump. It was spotless. The engine I got from Jhot had 89km on it when I got it. It came with the fans. The fans are mounted as pullers(mounted in between the engine and radiator). you can feel a good deal of air blowing on the engine from the fans when there on.

[lexrob]

194F is "ideal" temp for combustion just "fyi"(turbo may add a twist to that)

Are you running motor from "dead" cold to warm with rad. cap off to bleed.. takes like 10-15min. ***Grab a brand new rad. cap.***

I also recomend waterwetter i researched it for days. It works good and i noticed a slight improvement over straight water.

If you have to Gangster prop that hood in the back 1/2in or more. Lowers underhood temp. at idle by 15deg. and crusin like 10 in i think two diff. mag. articles. I know JDM yea yea flame do it as safeness for now.

[meet07]

i wanna say that my cap is a 13psi cap. I replaced it with anouther that i had. the currnet cap is no more than a year old. i swaped that cap with the one that came with the radiator. still the same thing. now its not boioing over into the overflow but anything outside over like 80 it will try to creep near 210. i replaced the thermo with a 170F unit and it seems a lil better but not like i like it.

I did runn the car with the radiator cap off when i 1st started her up. I to purchased a nismo themostat. im not about to spend 200 plus bucks on a fan right now. So im thinking factory thermo in the winter and nismo in the summer. Im also going to invest in a oil cooler as well. i should be throwing that together here in a week or 2.

[streeteg]

Ya that :"JDM hood prop" works. Looks horrible though IMO

[Neejay]

Ya that :"JDM hood prop" works. Looks horrible though IMO

Yeah, I don't like the look of it, but I have to do it for now.

Engine > how it looks

lol. When it gets a little cooler, I'll put the bumper back on.

[Sixgunsports]

Ya give nthe fact that my Bay is almost totally enclosed given the body work on the front end/ no ducting in the bay, and overall changed characteristics of the air flow, it cant hurt. Not to mention that its a weekend car for the strip (eventually) and some fun runs and cruises throughout the backroads of NJ/PA. so its going to see non daily driver stress on it. Not in High RPMs all the time but enough to where I want to make sure that I am giving it the appropriate cooling it needs.

My car is the Z in the front-- runnign a little hot with my current setup, the skyline behind me is a 26 that has the clutch fan on a shrouded stock R33 radiator and he never goes above 81-82 celsius. He runs stock thermo as well.

Holy Shiz man. Look what you did with my old car. That thing is amazing now. Someone posted a photo of it on our forum today and I just gave 2 thumbs up.

Dude, it's looking ALOT better. Props to you. Hit me up if you want some old photos. I have build photos of it in naked steel, the V8 swap that was in it, the original motor that was in it and much more. Been awhile since I talked to ya. Also found the title, lost your number but kept it in case I found you. Sitting in my closet if you want it.

Shoulda stuck around for Grits the next morning! That old woman was gonna buy em for ya.

[DrifterProdigy85]

Got done using Conzult with my RB. Engine runs between 155-160* with the clutch fan. Also using a Nismo Thermostat.