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For the typical EJ255 engine in the 818, what is a good coolant expansion tank size. I would like to replace the subaru plastic bottle with something that looks better. wondering if the system with more coolant would expand more than on the WRX, and what that translates to in terms of size? I haven't measured the stock plastic bottle but it appears for be around 64 oz? Has anyone tried a smaller bottle, say 20oz, and is it adequate?
I used 1 quart tanks with no issues. Thee one on the right is for the cooling system. On the left is for the AWIC system.
https://thefactoryfiveforum.com/atta...2&d=1547369212
https://www.napaonline.com/en/p/NDP7304514
I used two of these one for engine one for AWIC
Attachment 100653 Attachment 100654
I am using one of these mounted in the engine bay https://www.summitracing.com/parts/ctr-80-201
Attachment 100722Attachment 100723Attachment 100724
Many racing organizations require a 1L or 1Qt minimum, if that matters.
I made a custom one that is about 1.5 liters or so. The OEM one off my 07 WRX donor was too small to stay full when both hot and cold, due to the added value of the coolant in the 818.
Thanks for all of the ideas and validating some assumptions.