I have just boosted my JDM B18C to 8PSI and most things seem to be good but i have a couple of questions and possibly issues.
I started out with only 1 12" slim fan on the standard radiator and when I stopped the water temp would go up to just over halfway and come back down when i started off again. Put another 10" in there and solved that problem.
Now when I stop and turn off the car, if I leave the ignition on the fans run for about a minute and then switch off, water temp seems to be fine. However, there is a noise like bubbles flowing through the top radiator hose. Not a constant bubbling like it is boiling but a small squelching noise every approx 10 seconds. I let the car cool and then open the radiator cap and I am missing about 100ml of coolant which seems to be in the overflow bottle. this has happened 4 times and has got me worrired!
Oil temps seem to be a little high too, after about 10 mins of driving it sits on about 240F and under heavy boosting it might go up to about 255F and then come back down. My Autronic computer cut the power at 6000rpm once at this temperature. Obviously an oil cooler is the way to go, but will this help with the coolant too?
How big is your front mount?