RB in S14 cooling issues

[s14_sport]

Ok, so I have a cooling issue. I've done almost everything I can possibly think of to do to lower coolant temps. So I decided to come here.

I have RB25 with koyo rad, 10" puller and a 12" pusher, nismo t-stat, FAL thermostatic efan controller. I can start the car up and let it idle to warmup temp ~65-70 C. Then when I start driving the car thats when the temps climb and climb quickly. But, only when in boost. If I stay out of boost the temps stay reasonably steady.

I had a powerFC, defi bf temp gauge and stock temp gauge. The powerFC and Defi temp gauge are within 2-3 degrees of each other so I know they are pretty accurate and we all know the stock temp gauge only reads hot when its too late so that doesnt help much.

I drive the car down the road and when i boost the car will quickly climb from 70C to 80C within a minute....keep boosting and within another minute I'll be at 90C....if I boost anymore I will go up to about 95 and then I don't push it anymore and shut the motor off and completely cool down.

Now just recently I got the FAL 220 dual efans with shroud and modded it to fit with the stock S14 radiator. These seem to help by allowing it to take longer to heat up to the same temps...maybe 2 minutes before going from 70-80 and another 2 before getting to 90...but it would still climb if I were to drive it anymore after that.

Does anyone have any suggestions on this?

[Darius]

Are both fans mounted to the radiator and across from eachother? What brand of fans are you using and what are they rated to flow?

[gawdzilla]

do you have the under body "splash tray" in?

[s14_sport]

Are both fans mounted to the radiator and across from eachother? What brand of fans are you using and what are they rated to flow?

The fans are the FAL 220's....they are mounted next to each other as pullers behind the radiator. CFM rating is 2500

[s14_sport]

do you have the under body "splash tray" in?

and im actually missing the underbody splash try thing.

[gawdzilla]

and im actually missing the underbody splash try thing.

that helps stablize the temps tremendously. i definitely recommend getting it. it will help keep your temps down at speed.

[240z4u]

There have been cases where folks have had water pumps with the blades worn badly. Really hurt water flow.

How is your timing set? You may be heating up the motor with a bad tune too (timing particularly).

Evan

[s14_sport]

There have been cases where folks have had water pumps with the blades worn badly. Really hurt water flow.

How is your timing set? You may be heating up the motor with a bad tune too (timing particularly).

Evan

I put on a brand new water pump. Timing is set perfectly and I have since switched back from PowerFC to stock ECU. Runs much better.

But one thing I do know is that I have a few boost leaks. small ones, but, I'm fixing those as soon as I find my leak tester.

[lilskyline240]

are you sure u got all the air pockets out of the coolant system? Cuz im only running one 12in pusher fan that i pulled out of a car at the junkyard and i NEVER see temps over 80c no matter what the temp outside or how hard im beating on it. Im running a Mishimoto radiator with stock T-stat.

[Carl H]

replace the nismo tstat with the standard 79.5*c z32 tt one and fit a z32 tt radiator cap...nissan parts ONLY!fit an external oil cooler.

[l0nestar]

are you sure u got all the air pockets out of the coolant system? Cuz im only running one 12in pusher fan that i pulled out of a car at the junkyard and i NEVER see temps over 80c no matter what the temp outside or how hard im beating on it. Im running a Mishimoto radiator with stock T-stat.

So you like the Mishimoto radiator also? hmmm..

replace the nismo tstat with the standard 79.5*c z32 tt one and fit a z32 tt radiator cap...nissan parts ONLY!

Maybe I should drop the Nismo t-stat and install the Stant Z32 that I have sitting in the box in my garage..

[Darius]

Your setup should definitely not be overheating. Normally it is that people need more shrouding or the fans are too small. But in your case, the fans suck air hard and this shouldn't be happening.

I think the lower engine bay tray helps, like gawdzilla said, and maybe try checking the water pump belt tension. (??) Does the 220 shroud completely seal around the perimeter? If it doesn't, the fans will pull a lot of air through the gap instead of through the radiator.

[l0nestar]

S14_Sport,

Did you ever receive your replacement Z32 ECU?

[s14_sport]

are you sure u got all the air pockets out of the coolant system? Cuz im only running one 12in pusher fan that i pulled out of a car at the junkyard and i NEVER see temps over 80c no matter what the temp outside or how hard im beating on it. Im running a Mishimoto radiator with stock T-stat.

ok going to try and bleed the coolant some more...

replace the nismo tstat with the standard 79.5*c z32 tt one and fit a z32 tt radiator cap...nissan parts ONLY!fit an external oil cooler.

ordered the tt and rad cap and looking into oil coolers...

Your setup should definitely not be overheating. Normally it is that people need more shrouding or the fans are too small. But in your case, the fans suck air hard and this shouldn't be happening.

I think the lower engine bay tray helps, like gawdzilla said, and maybe try checking the water pump belt tension. (??) Does the 220 shroud completely seal around the perimeter? If it doesn't, the fans will pull a lot of air through the gap instead of through the radiator.

[

i know tension is pretty much perfect...but the 220 is not entirely sealed. im gonna work on that now.

S14_Sport,

Did you ever receive your replacement Z32 ECU?

yes, as a matter of fact i did get my Z32 back...
Modified by s14_sport at 3:49 PM 7/16/2008

[eh?]

ok going to try and bleed the coolant some more...

ordered the tt and rad cap and looking into oil coolers...

[

i know tension is pretty much perfect...but the 220 is not entirely sealed. im gonna work on that now.

yes, as a matter of fact i did get my Z32 back...

Modified by s14_sport at 3:49 PM 7/16/2008

Jack the front of the car up as high as possible. Remove the radiator cap and set the heat on high. Start the car and massage all the coolant lines to makes sure all bubbles are out.

[s14_sport]

Cooling issue SOLVED!

1 - ripped out my radiator and put in a griffin rad underneath the rad support.

2 - slapped the stock fan back on.

3 - went through a long *** bleeding process.

without even putting shrouding back on....OR even putting the under engine shield back on I tested it out.

Temps have gone down from 90-95 C to now 70-72 C at idle.

I let my motor run for an hour after that and revved it quite a few times into boost getting it to go up alittle bit hotter around 75 C and it just came back down to 70-72 within seconds.

I don't have everything back together to give it a few tests runs on the street, but, at idle was my main issue so I don't believe I'd have any problems in and around town and highway.

This is HUGE because high temps have plagued me for nearly half a year!

[s14_sport]

[ANVIL]

damn, almost 20 deg C in difference... thats a huge difference. mine is about the same way im going to try to get my idle temps lower here in the near future. only have 1 14" pusher right now, going to put in another either 12 or 14 incher in and see what it does. right now i do about 88-92C at idle. man id love for mine to be in the low 70s

[s14_sport]

I went from dual 12" pushers, to one 12" pusher and a 10" puller, to dual flex-a-lite pullers with shroud and the only differences made were very minimal. maybe 5C lower when I went to the dual flex-a-lites (which i now have for sale, btw..lol)

[Shocker]

s-14 sport what model griffin rad is that?

[ANVIL]

well im not too worried, if i can get 5C lower id be happy. i mean 92C is 197F which is pretty much normal operating temp for most cars

does the car feel any different performance wise since you went to clutch fan?

[s14_sport]

s-14 sport what model griffin rad is that?

ill check when i get home later...

well im not too worried, if i can get 5C lower id be happy. i mean 92C is 197F which is pretty much normal operating temp for most cars

does the car feel any different performance wise since you went to clutch fan?

The way the car feels now that i dropeed 15 degrees makes any performance lost by putting on a stock clutch fan irrelevant.

So to answer your question, yes, I feel BETTER performance since I went to stock clutch fan.

[ANVIL]

now im curious on what s13 guys are doing to get those kinda temps

[Shocker]

ill check when i get home later...

yeah if you could check I'd appreciate it.

[s14_sport]

on the side of the box I saw:

GRI-1-28241-H

[ANVIL]

how much do u want for ur fans? send me an email [email protected]

[Carl H]

and to think that everyone laughed at me when i did this setup...

[Shocker]

and to think that everyone laughed at me when i did this setup...

No laughs here, I found through measuring it appears that the s-14 core support has more room for the rad to be tucked underneath it compared to the s-13's. (Stupid pop up light motors are to blame)

[coreansurfer]

i had a similar prob, but i added a second relay to my fan wiring, and it made the fans run harder, my temp gauge doesnt go past the middle

[nyc240sx]

nice