And cheap. NCM track day Sunday will be 5x 20min sessions and 90F ambient. I think the diff will hold up, and if so then I will join the hour long final session and see how long it takes to reach ~280F.
Did you try this one? I was thinking about snagging this today to see if it fits under the car (would have to be laid on its back I’m sure). I do have the Ryobi batteries already, Ryobi Blower, and Ryobi small garden sprayer.
No
seems a 12v auto battery, spare window washer pump and reservoir, a few nozzles zip-tied/hot-glued to the air outlet would do wonders. An 8-bit micro controller or PI board. And blue-tooth based connectivity and home-made app to regulate pulse width and timing of the pump.
That seems so tedious and unnecessary. Why not get a handheld weed sprayer for a constant misting:
The leaf blower is the fastest. Is literally 2 mins. You want the air also cause u want the heat absorbed by the waterThat seems so tedious and unnecessary. Why not get a handheld weed sprayer for a constant misting:
I mean...yes. Looks an over killed.
but seriously is really really simple. 
Nice idea but that does not look like the misting fan. My fan is made to sit on top of a bucket of water to provide the mist. It can also be hooked to a hose but those aren't always available at the track. My fan appears to have a larger base. I've been trying to think of ways to provide a water source without having it sitting on top of a bucket when I can't access a hose. I'm thinking about about backing up on my trailer ramps stopping just so the diff is in the open air between the ramps and using wheel chocks on the front tires to hold me there. Will require some help from someone else. The addition of water to the air flow is supposed to cool better. So I'm still working that out. Using my sprayer with just water and a source of air might work out better and could possibly be done with the car on the ground.Today I made a cardboard template to help position my fan to the wheel chocks. There is a 3" deep notch in the edge to locate the fan. I want the chocks and fan on the ground for max clearance and so that they don't shift when backing up.
The diffuser just clears the fan when backing up.
The cardboard folds up and goes in the trunk for track day.
No, I have this one https://www.homedepot.com/p/RYOBI-O...5-Ah-Battery-and-18V-Charger-PMF01K/312025245
That's what I have. @Flyhalf This is battery powered as well so it could run on it's own spraying water. With the hose taped to a wheel chock or something to aim it at the diff. Then use another wheel chock to aim blower at the diff. Could let this run together for 5 mins, 10 mins... however long the tank of water or batteries last. That's a limiter here if you need to bring a bunch of batteries. Luckily at one track I visit regularly I have access to charge batteries.That seems so tedious and unnecessary. Why not get a handheld weed sprayer for a constant misting:
Tie the nozzle of the sprayer on the leaf blower, then tie a ziptie on the trigger. That way the stream of water gets sprayed directly into the path of the forced air and you don't have to lay on the ground trying to pour water under your car. Just sit back and relax.
Based on my experience from using the Ryobi unit to spray weeds, a normal sized battery can do about 20 gallons of liquid which is an hour or two of operation. I go thru a gallon in about 8-10 minutes of constant spraying. You can also get a non name-brand extended battery for cheap and it can last more than twice that. Should be enough to last you a whole day on one battery.
Good ideas. That was my goal was figuring out how to do it without a lot of extra effort on my part.
Yeah I've never been concerned much with the battery life. I've only had issues when I don't watch the battery levels and only on my leaf blower or my 1/2" impact. Tools I use often and probably draw more power. I probably should have jumped on the Ryobi days deal to buy two more 4 amp batteries and get a free tool but there's nothing I need really. I think I have 3 4 amp and 3 smaller batteries. Should be plenty for a track weekend.
definetely gonna consider it. However honestly my main issue is keep trans cool. Diff doesnt really over heat for me. 