Charge cooler radiator sizing

Get the biggest one you can fit

FWIW the stock chargecooler rad on the Pace system has been questionable for my RST. It seems Pace made one with a bigger rad, one almost the same size as the factory rad! It wasn't the thickest thing in the world but to be fair it did keep the temps cool.

I'm surprised no one has said just get an intercooler but I do know that with the rad it was still smaller than an intercooler, and on an RST running an intercooler generally results with removing the grilles etc. on a Series 1.

largest frontal area you can get in as said . I used a 600x450 doblo engine rad with the very fine fins that cut you to shreds if you catch them with a pwr 6x6 barrel cooler and 450hp and it worked superbly on the road and took 20 mins of track abuse to get the water up to 40c

Remember the radiator won't cool the charge coolant back to ambient in one pass, it is the duty of the reservoir to have sufficient stored & pre-cooled coolant available to reduce charge temperature when on boost. You'll notice serious installs have a reservoir of a few gallons for this. Then, when the engine comes off boost, the pump circulates the coolant back through the rad and slowly brings it back down to ambient. So to truly engineer the solution you'd calculate the flow of your pump against your reservoir volume and select parts so that pre-cooled coolant will be available in a worst case scenario. Which isn't that long really: e.g 20 seconds of coolant in reserve is likely more than enough (Think how fast would you be going at what full boost for 20 seconds...)
Just food for thought.

Anyway if you want big and cheap, I think the P38 range rover came with a 2 foot square exchanger that is/was cheap on the bay.

Beers,

HH