99SH

I'm having trouble keeping my water temps cool, primarily due to the lack of airflow. I'm running a Novi 1200 @ 14psi boost. My radiator (Fullblown unit) is not getting enough cool air as it's covered by the AC condenser, oil cooler and heat exchanger.

I thought of purchasing the 2-pass radiator, but without air flow it's not going to be as effective.

I've been thinking of getting a few water misters and placing them in front of the radiator. I know it's fairly common in the RV crowd where they pull heavy loads and see high temps. I would only need the mist to work for 20 minute sessions.

My oil temps peak at 250F; Water @ 235F. I'm running 3 fans (2 pullers and 1 pusher) to get air moving - but it's apparently not enough.

Thoughts?

spdracerut

Do you have a vented hood? I would be weary of using a water mister on track. The water SHOULD evaporate, but generally the possibility of leaking fluids on the track is not a good thing.

99SH

I have a CWEST hood and the louvers are damn large. It did help lower underhood temps.

I'm not too thrilled about the idea of splashing water either. I do want to get the 2-pass radiator for extra insurance, but its a lot of money.

nissanfanatic

Considering the volume of water in the cooling system vs the maximum volume of water you could possibly carry to spray on the radiator, I don't see how it could possibly be effective.

Also, I would think the water would vaporize fairly quickly.

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What is your water/coolant mixture ratio?

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Be careful stacking fans on the radiator. At higher speed, they can serve as a restriction for air passing through. I would only run as much fan as you need to keep from overheating while idling. Leave the radiator as open as possible for air to pass through at speed.

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Your water temp/oil temp delta is very impressive.

Topplayer

Funny you bring this up I was thinking about doing this with my oil cooler after I solved my water temp problems. I am going to try ducting first

I run 14.5 lbs boost in my set up. I had the same problems as you (still have my a/c). I bought the dual pass rad and now my colant doesn't pass 214 and rarely over 205 (215 was in heavy track traffic)



now I am working on cooling down my oil, Top I saw was 288 in heavy traffic mostly around 270-280 tho
What is your oil cooler set up? if I stayed around 250 I would be happy.

turbo8765

IIRC JDM Evo's had this "feature" from the factory. I think it would work but it's too risky on a track car.

Are you using distilled water with surfactant?
Do you have ducting?

99SH

I'm running 100% Honda coolant. Good point there, I can replace with water and gain some efficiency.

As for the number of fans - I would overheat when running on the freeway with the AC ON when ambient temps were about 100F. Once I added the pusher fan and a larger puller, the temperatures went down to a safe level (210-215 ish). On the street I do have my license plate blocking the radiator, so that's another variable.

I'm thinking about running one or two 3" ducts cut into the belly pan and point it towards the radiator opening. Using online calculators each 3" duct will produce ~1000 CFM at 60 mph.

Here's the oil cooler


The aftercooler also covers up the entire opening


Thinking of punching holes in the plastic belly pan below and running ducts up here (photo is without pusher fan)

99SH

What were your oil temps before the dual-pass?

I'm running the Fluidyne DB-30618 oil cooler. It's a beast!

turbo8765

I'd bet distilled + ducting gets you where you need to be.

CKit

more shrouding / ducting