Are you building a 2 tank system or a one tank system there are a lot of advantages to a 2 tank system---several of us call a radiator in a box
We use the 2 tank system and is what I'll also use in the lakester. No ice water though. Is there a reason for that? Is this also planned to cool the intercoolers? On the Stude and what I'll do they are different systems and I'd keep them as such. The reason is you want the water going to the intercoolers to be at its coldest as the run progresses to be make the intercoolers as effective as possible. If the water is heated by the radiator and getting warmer it is getting warmer just when you need it colder if that makes sense.
As far as volume I think 30 gallons for the water cooling the rad. is sufficient. That is what we are using. We are building more heat with the bigger motor and the increased HP potential with the turbos but hopefully the run time down the track will be quicker so the cooling time needed will decrease. The rad-in-a-tank is much more efficient that trying to cool the water directly from a tank although it worked for us before and many others. I think you are on the right track there.
I made the intercooler ice water tank almost 30 gallons but that wasn't so much for the water volume but to have it large enough to get the bags of ice in that I think we might need. I think Speed Demon's is about 30 gallons also for the intercooler water.
I made a spreadsheet to help figure how much ice is needed for the ice water tank for the intercooler....
http://purplesagetradingpost.com/sumner/bvillecar/bville-spreadsheet-index.html... but use it with caution as I've had no real life feedback to see if it is applicable to real life situations but it does give some ideas of how much ice is needed in theory. We haven't run the car ourselves hard enough to see. We were seeing manifold temps at 100 deg with 250 deg. air after the compressor and we only put in a couple bags for those runs so didn't really pack the cooler at this point it was mostly just cold water and not a lot of it.
Also here is a link....
... to the build on the rad-in-a-tank.....
http://purplesagetradingpost.com/sumner/Hooley%202013/13%20-%20hooley-construction-2013-13.htmland ....
....another to the construction of the ice water tank for the intercoolers.....
http://purplesagetradingpost.com/sumner/Hooley%202013/13%20-%20hooley-construction-2013-24.htmlProvide drain and pump options and make it easy to dump ice into. We carry about 30 gallons of water in 5 gallon buckets with the snap on lids in the push vehicle and have the 30 gallon tank in the car full. Then we add ice and water (from the buckets) to the ice water tank for the run. After the run we can drain some water out of the main tank into the buckets to cool down and replace that water with the water from the ice water tank where the ice has now melted. We have a portable $30 pump and garden hose to do the transfer.
Next run we repeat the cycle letting some of the water cool in the buckets,
Sum