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While rebuilding the S1 Dayz RS4, I measured the thickness of the core at 25mm. I compared it to the other RS4, the one that has the "gurgles", and was very surprised to see it was only 17mm.. Even the 25G is 25mm.

I now recall that when I was fitting the FFP I broke the top hose connection and bought a replacement radiator off the forum, never noticing the different thickness. Someone flogged me a bodgie rad. My BAD..Buyer beware. When the 25G got front shunted I used the core off the RS4 to get the rad fixed. Hence it being 25mm now. It runs cool as a cucumber.

Just maybe, the reason the 17mm Stag has the gurgles is because the rad is too thin and it boils when pushed?

Next thing is to get a Rad with a 25 plus core.

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https://www.sau.com.au/forums/topic/444154-c34-radiator-core-thickness/
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  • 8 months later...

Not only an FMIC but also a tranny cooler. I had thought of putting in an oil cooler but I have a remote oil filter also and it would have been a PITA to fit. The alloy rad fixed all.

Edited by 66yostagea

S1 is quite thin (approx 15mm, same as R33 GTST IIRC)

An aftermarket koyo rad (standard construction, plastic top and bottom tanks) is thicker at about 25mm, but has fewer flutes than the stock rad, as the flutes are wider.

No idea which would flow better, could be a close call (fewer large flutes v's more smaller flutes) but surely additional thickness will improve cooling?

Y31 Cima rad is identical in width/height as the C34/R33 rad, but is double row, so a good upgrade for cheap if you can get one!

Edited by crazy86

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