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Old 05-15-2005, 01:41 PM   #1
xcntrk75
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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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Old 05-15-2005, 02:25 PM   #2
theonlygreat
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200F is normal for a modern engine. A new Ford normally operates between 190-210F.
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Old 05-15-2005, 02:59 PM   #3
xcntrk75
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^^^^
Well normally I wouldn’t have been concerned, however when I was getting my UTEC tuned, the tuners had a hard time getting the motor back down to their ideal temp baseline in-between pulls, and in a couple instances had to turn it off and let it set for several minutes to get back down to their “testing” temperature. Not overheating by any means but simply running on the hot side, at least according to the tuners. This in turn led me to begin watching the temps over the past couple of weeks…
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Old 05-15-2005, 03:22 PM   #4
MyFirstDeuce
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subscribe. The needle never moves from the middle but I know its running hotter.
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Old 05-15-2005, 05:00 PM   #5
Jaxx
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in the coolant line front the heater box i see 75-85 C which is a bit cooler but not much
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Old 05-15-2005, 06:06 PM   #6
subbyspeed
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200 isn't bad at all. I see alot of cars running up in that range. I know toyotas do.
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Old 05-15-2005, 07:31 PM   #7
DJIMPREZA
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I have seen this trouble as well, but in a different manner

The NA fans has a fixed velocity while the turbo ones uses low and high, somewhat our NA speed is not enough in some cases.

I have my car with opened hood vents, blitz 1.3 kg cap, coolant/water mix 50%/50% and the NA fans are working in pararell.

It is alwasy great, I can do dyno pulls, drag, traffic, cruising with no problems, but If I turn on the A/C on very hot days on traffic, I will overheat 10-12 deg over the standard mnax reading, that`s around 108-110 Deg Celcious top.

I am thinking on putting 100% water to the engine, I also put the turbo radiator core with the NA tanks, (thicker)

I know the fans speed are the culprit, but can`t have th eturbo fans installed in the rad upper and lower tank of the na style, they simply don`t fit

DJ
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Old 05-15-2005, 11:45 PM   #8
subbyspeed
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don't run pure water.. water boils at 212 degrees.. And if that happens in your car, your screwed.

This is the whole reason why antifreeze was made. It provides protection in cold weather, by lowering the freezing point, and provides protection in the heat, by raising the boiling point of the fluid. Then add in a radiator cap to pressurize the system, the pressure also adds to the boiling point. So a 50/50 mix is the least people should run. I can't remember off hand, but there is a certain mix(AF/water) that provides the best (highest) boiling point. I want to say its somewhere around 30antifreeze/70 water.. Don't quote me on it, but its more on the water side.
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Old 05-16-2005, 12:11 AM   #9
garface
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I'm in the exact same situation because my car was an AT before and I left the stock radiator on the car. I usually am around 176-185F for regular driving and never have seen it pass 206F whether beating on it or sitting in traffic on a really hot lower NY day with the AC on. I have an STi EJ207 if that makes a difference. This is taken from the ECU's sensor with a max record function of the PSi3 SECS unit.
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Old 05-16-2005, 07:28 AM   #10
xcntrk75
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^^^^
Damn AT radiators… Did you leave the AT core empty or fill it with some coolant then cap it off? Sounds like my temps are simply the nature of the beast. I did upgrade the size of my header-tank lines to the next larger internal diameter. I know the systems flowing well too.

So does nobody recommend dropping to a lower thermostat? I’m kind of sold on the Zerosports advertisement that if the cooling system circulates earlier (160F) the system will have time to cool before reaching the higher temps…
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Old 05-16-2005, 05:06 PM   #11
subbyspeed
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Quote:
Originally Posted by xcntrk75
So does nobody recommend dropping to a lower thermostat? I’m kind of sold on the Zerosports advertisement that if the cooling system circulates earlier (160F) the system will have time to cool before reaching the higher temps…

it will help, how much i'm not sure.. cause when your sitting in traffic or don't have alot of air passing through the radiator, it seems thats when people are noticing it getting hot. So i guess it would be as good as your fans in traffic.. But it could keep it lower going into a traffic situation, so it takes longer for it to heat up to where it was before. Couldn't hurt.
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