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Old 11-19-2020, 01:56 PM   #1
m5gorrf
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Default What can be done to cool.. Suggestions pls

Need to increase cooling in 100 plus weather. In 100 to 104f in mountain driving, the OEM gauge will go to or above 2/3, a bit higher if in boost. The AccessPort shows in the 220s sometimes 230s

2006 WRX wagon with 185K miles & a 3in aluminum radiator. OEM Thermostat checked when head gaskets, timing belt & Gates water pump were done.

Will be installing a built STI long block soon.

Anyone have experience with flow restrictions & how to solve. Dropping the thermostat temp is said to be a bad idea. Have seen some 'in line' larger thermostats that could increase flow, designed for a V8, also what is the best water pump to increase flow?

This must be an issue with front mount intercoolers?

Thanks for reading
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Old 11-19-2020, 04:30 PM   #2
Unabomber
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You are assuming there is something wrong and most people don't know what wrong looks like.

Oil Temperature: Cold = outside temperature, 220ļ to 260ļ F normal
Coolant Temperature: Cold = outside temperature, 170-200ļ F normal.

If you are EXCEEDING 260 oil or 200 coolant, worry. If not, don't.
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Old 11-19-2020, 05:10 PM   #3
benflynn
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How old are them head gaskets? I have had a few hg failures over the years, tho all on SOHC ej25, sometimes they are very slow to develop, and will show slight increase in temps. Once finally failed the slow ones would show wear on all 4 fire rings, they would also have a slow loss of coolant, like low every other month.
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Old 11-19-2020, 07:27 PM   #4
truck7575
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Aluminum radiator from someone like koyorad that is bigger/thicker than stock coolant flush and fresh super blue subaru coolant and new subaru thermostat is where id start... Basically optimize cooling efficiency
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Old 11-19-2020, 07:58 PM   #5
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i have seen my ap coolant temp go as high as 240 with ac on and hot ass GA summer and my gauge in car still stay at half
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Old 11-19-2020, 08:03 PM   #6
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run straight water with water wetter. delete your scoop and run louvers (vents). killer B does a coolant pipe which removes a choke point in the OEM system. there's also a cylinder 3 cooling mod kit bypass thing which lots of manufacturers do that you'll need.
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Old 11-19-2020, 08:11 PM   #7
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Cylinder 4 cooling mod lol
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Old 11-19-2020, 09:06 PM   #8
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can't delete hood scoop if they have TMIC still
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Old 11-19-2020, 10:26 PM   #9
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Cyl 4 coolant mod. What brand radiator do you have? Cheaper ones, and even moderate priced like Mishimoto can have flow restrictions do to welding issues. My mishimoto had slag at the ports that I had to grind down to improve flow. I would recommend Koyo or CSF radiators. They are much higher quality in all aspects. Killer B has created a better flowing water pump outlet that's worth looking into as well.
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Old 11-20-2020, 12:53 AM   #10
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Fluidyne. Worth every penny.
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Old 11-20-2020, 02:12 PM   #11
m5gorrf
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GREAT Suggestions will look into them. Coolant temp with AC on, driving uphill at 100f plus is 220 to 230. i have to climb to get home in the afternoons. The temp does drop to normal with a short downhill before another uphill..

Head Gaskets about 20K ago, Can't remember the brand of 3 in radiator but was not cheap.

Are the OEM fans up to the task?

Thanks & any other experiences are welcome.

Last edited by m5gorrf; 11-20-2020 at 03:19 PM.
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Old 11-20-2020, 02:30 PM   #12
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You said 3" aluminum radiator? Please don't say it's a bargain brand that starts with an em.

Like others have said, first make sure the engine's health is good.

An FMIC will affect radiator efficiency and if you're using a cheapo radiator (no matter what the marketing claims or how big it is) it will perform worse than OEM. The OEM radiators are very good for OEM turbo power levels, especially for flogging up a mtn road. Beyond that a Koto R would be the least expensive radiator we ever recommend. If that doesn't fit your budget, stick with stock, as it will give you the best performance. If you're making mad power and track a lot there are other higher capacity options out there.
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Old 11-20-2020, 06:45 PM   #13
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+1 more efficient radiator, make ducting for radiator better, improve flow of coolant, oil cooler, ps cooler, etc
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Old 11-21-2020, 10:47 AM   #14
NicMonte
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I have a Megan racing Radiator. 175$ from eBay. Itís quality is great, and performs as it should, no fitment issues. Iím willing to bet itís just as good as a KOYO or MIshi.

I personally didnít want to spend 300$ for one, but didnít want to settle for a NoName eBay one as well. Because we all know you end up spending more money after a cheap cheap purchase.

My temps significantly dropped after install, and I bet if I invested in a new AC Condenser,during and before install(as mine has rocks and insects packed in, 217k miles worth) it would have dropped them even lower then what Iím seeing already.
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Old 11-21-2020, 01:52 PM   #15
m5gorrf
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Correction 2 1/4 inch core radiator, I also have 'cleaned' the AC Condenser with the spray for this task sourced at Lowes. I had the radiator out, straighten the fins and used a brush & wire tie to clear any part that had been plugged by mud in a small area & bug guts, used a hose to back flush the AC condenser.

This radiator showed a marked improvement over the OEM. Why I am thinking it is the tested but original thermostat or something else restricting flow or the newly replaces Gates supplies water pump with the timing belt.

Any suggestions on a higher flow thermostat with the same temp? Or experience on a better than OEM?

Thanks
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Old 11-21-2020, 06:23 PM   #16
NicMonte
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You can clean the ac Condenser(which youíve done), or just replace for a mere 50$ plus shipping. Iíd personally replace(looking back) and probably will, because my coolant isnít the 30 dollar per jug Subaru specific coolant, so I wonít be as upset if I drain it again and replace. ** or.... you could reuse your fluid, which I wouldnít advise.

Always go with a Subaru OEM Thermostat, water pump and timing Kit, unless otherwise told by a Tuner, and or, a shop that specializes in builds That knows what they are talking about etc etc etc.

Other than that.... I got nothing for you... hope Iíve helped!
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