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Old 05-15-2005, 02:41 PM   #1
Scooby Specialist
Member#: 60224
Join Date: Apr 2004
Chapter/Region: MAIC
Location: NOVA
2008 FXT Sports 2.5
Dark Grey Metallic

Default Swap and higher coolant temps

Any EJ20 swap owners who kept their stock NA radiators running a bit hot?

I’ve been noticing that my swap project is running a little hot as I’ve been monitoring the temps regularly over the past couple weeks. The stock idiot temp gauge sits just short of the middle (where it’s always been) and doesn’t tell me much, but when I pull the temp data directly from the ECU it appears I’m running hot, with an average around 199-200F under warm conditions.

I’m running my old NA stock radiator with the lines hooked up properly to my EJ20 header tank. The system has been fully burped and is running a standard 50% coolant mixture (265F boil), with a bottle of water-wetter. I have no leaks and have been running the system in this fashion for a period of time now.

Some items which might be to blame; is that my stock NA radiator was originally for an AT which has the integrated AT cooler (inside the radiator) which is currently empty and not hooked up. Obviously this is taking up coolant core space which would otherwise be used for the engine in an equivalent MT model. Also, I still have AC and have the huge AC cooler which is the overall size of the radiator and sits in-front sucking up the direct air-flow. And lastly, I’m running about 80-90whp above stock yet still run the OEM heat range of plug.

My questions and need for advice:
  1. Should I install a lower heat range thermostat such as zerosports 160F (currently running stock at 172F)?
  2. Should I install one-step cooler plugs?
  3. Should I install a new aftermarket radiator?
  4. Should I not worry about it and accept the hotter running temps?
Any feedback or general comments would be appreciated…
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