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Old 02-12-2021, 12:08 PM   #1
m5gorrf
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Default Has anyone tested the Performance thermostats?

Hi & thanks for reading,

I have been fighting engine running over 220f in hot weather (over 100 degrees) driving steep mountain roads. 220 on the access port from the OEM sending unit

Has anyone actually tested the flow rate on aftermarket thermostats. Or had experience where one was installed and saw results?

The OEM 78c is under $20, don't mind spending twice for real results, not the MFG hype. My drives are over an hours so lowering the temp on the thermostat will not do much if anything.

I have a good aluminium radiator, have checked the fans and have purchases what is tough-ted as a high flow OEM water pump. for the new engine. Any other suggestion will be gladly accepted.

Thanks again
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Old 02-12-2021, 01:37 PM   #2
car_freak85
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Have you tried burping your cooling system?
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Old 02-12-2021, 01:43 PM   #3
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Yes, made a funnel to do just that. Thanks every idea is welcome.

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Originally Posted by car_freak85 View Post
Have you tried burping your cooling system?
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Old 02-12-2021, 02:33 PM   #4
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You should be running well below 220F on your coolant while driving, even uphill.

You are either burning or leaking coolant, you have air bubbles or you have something more serious going on. I wouldn't go throwing aftermarket parts at the problem when 99% of people run OEM thermostats with no issues.

Burping the coolant and replacing the thermostat would be where I would start, let it idle with a funnel of coolant attached on the overflow and let it get up to temp. Then slightly rev the engine a few times when its mostly warmed up to attempt to dislodge air bubbles.

Do you lose coolant when driving the car?

Have you replaced the thermostat with an OEM unit?

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Old 02-12-2021, 03:10 PM   #5
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New OEM Thermostat?

What Radiator?

What fans?

With OEM parts you shouldn't be running anywhere near that. With cheap aftermarket 'racing' products, completely possible.
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Old 02-12-2021, 03:10 PM   #6
m5gorrf
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When the head gaskets were done, he (who now works for a Subaru Dealership) tested the thermostat. Saw it open fully. I have the car passenger side higher on an incline and run a funnel with coolant in it. at operational temp watching the bubbles come out. Funnel with coolant 1/3 the way up, seal to the tank. Repeated until no bubble show.

For the new beefed EJ257 buying a 78c OEM unless someone has a proven better.

Thanks
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Old 02-12-2021, 03:22 PM   #7
K3rm1tth3fr0g
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Quote:
Originally Posted by m5gorrf View Post
When the head gaskets were done, he (who now works for a Subaru Dealership) tested the thermostat. Saw it open fully. I have the car passenger side higher on an incline and run a funnel with coolant in it. at operational temp watching the bubbles come out. Funnel with coolant 1/3 the way up, seal to the tank. Repeated until no bubble show.

For the new beefed EJ257 buying a 78c OEM unless someone has a proven better.

Thanks

Even if you don't see active bubbles appearing in the funnel, the system can still have trapped air that can cause increased temperatures. That being said it could be something else all together.

Killer B asked good questions,

What fans?
What rad?
Do you know 100% sure the thermostat is good? "Seeing it open fully" means nothing when you're at 220F still...

If you are on a Koyo or Mishimoto or equivalent radiator with OEM fans, then I would replace the thermostat with OEM and see if you are still having the same issue.

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Old 02-12-2021, 03:42 PM   #8
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Asking for flow rate on a thermostat is not a thing. That's grasping at straws.

Your issues to consider in the following order:

1. Burp your system. This is the #1 cause of overheating in Subarus. Open turbo pressure cap, fill with fluid. Start car. Insert funnel and fill with fluid. Every 2-3 minutes carefully squeeze the top radiator hose, not when it gets blazing hot though! Keep an eye on the level. Keep it topped off. Do this for 15 minutes. 900 seconds. Full 15 minutes. Don't bull**** this.
2. Do you have OEM fans on your aftermarket radiator? If so, remove and place in the nearest roadside ditch, even if they were $500 and pre-production prototypes by XXXX Baller Company. Install OEM fans.
3. Replace both radiator caps. Maybe one of both is tired. OEM is fine. Since you have an aftermarket radiator you could get away with aftermarket caps, but that likely won't have a huge impact. Stock tank is 1.3 bar, stock turbo tank is 1.1 bar. Ensure the "weaker" cap is on the turbo tank.
4. Maybe your water pump gave up the ghost and needs replaced. There have been rare reports where the shaft breaks free from the wheel and it don't spin right.
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Old 02-12-2021, 09:00 PM   #9
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Also check the ac condenser, if the fins are all flattened you need to replace
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Old 02-12-2021, 10:08 PM   #10
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Thanks,

Forgot to mention, on last coolant change carefully cleaned (with industrial condenser cleaner) & small wire ties to make sure the passages were clear & fins open.

OEM Fans, still have not hears anyone actually say. " I ran OEM fans with access port or any other device, the temp was X and aftermarket fans Y. I worked behind the parts counter for years and learned to ignore the MFG hype.. followed the science & numbers. I did check the fan shroud fit to me KOYO radiator. only enough room at the bottom to drain excess rain. tight fit on all other sides

On this subject do the aftermarket MFG give you a CFM vs the OEM CFM? Often they do not because the law suit happy jerks..

I burp-ed & also check the turbo tank often for air not finding any air.

The high flow water pump is sitting waiting for the new motor.. That will be the first change.





Quote:
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Also check the ac condenser, if the fins are all flattened you need to replace
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Old 02-15-2021, 12:58 PM   #11
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Make sure the fans are plugged in? Just a thought.
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Old 02-16-2021, 09:26 AM   #12
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Fan facts: https://forums.nasioc.com/forums/sho....php?t=1676070

Again, you need to burp your system. There have been hundreds of people far better than you that have gotten their ass bitten by rogue bubbles. FIFTEEN (15) full minutes with the hood up, heat on high, turbo coolant tank off, funnel in, funnel full of water, carefully squeezing top radiator hose every minute or so. "I don't see any bubbles" does not apply with Subarus...it may work on your old C10 pickup or your RX8, but it will only steer you wrong on a Subaru.
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Old 02-16-2021, 06:09 PM   #13
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Quote:
Originally Posted by car_freak85 View Post
Make sure the fans are plugged in? Just a thought.
Heheheheh I melted a pigtail making that mistake one time

+1 on burping. These motors are finicky. Take your time and burp it again.

Replace your thermostat with OE if you're going to replace it. The engineers at Subaru aren't dumb.
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