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Dual STi radiator cap?
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Old 09-26-15, 05:14 PM   #31
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Default Re: Dual STi radiator cap?

Bump revival!

Hey folks, so just to clarify, both OEM caps are rated differently or the same?? Need to know because I'm planning to change them out soon for maintenance purposes. No no, not getting any flashy STI caps, just the ones from the dealership with the yellorange label hehe. Just need to make sure that I'm putting the right cap where they need to be. I noticed that there are 2 different looking caps for the cooling system. One looks like it has wings on both sides, and the other is just plain round. Are they the same/different? Just FYI purposes to anyone, I do have a Mishimoto rad installed. Got rid of the provided cap that came with it because of all the horrific leaking stories, did not want to chance that. So yes OEM for the win. Thanks in advance guys.
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Old 09-28-15, 03:30 AM   #32
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Default Re: Dual STi radiator cap?

the two caps are different. they have different rated pressures, different functions, and the lids have a different look.

Be sure not to mix them up...
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Old 09-28-15, 03:20 PM   #33
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Default Re: Dual STi radiator cap?

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Originally Posted by BlueScooby View Post
the two caps are different. they have different rated pressures, different functions, and the lids have a different look.

Be sure not to mix them up...
Thanks for the reply Blue.

Yea ok just noticed that the upper res tank cap says 108kpa, and the one on my Mishimoto rad says 1.1... So I just googled the 108kpa is actually 1.08bar. can that be considered 1.1 since .08 can be rounded to .1? So that both caps would be similar? I don't believe I would benefit from a 1.3 on my rad would I? I read on some website that increasing the pressure would create a new weak point in my cooling system. My radiator hosed are practically still new. Lower hose is a year old, upper house is 1.5months old. I average 180-190F coolant temps monitored via AP. 1.1 should fair enough considering the hot SoCal weather I endure? Thanks in advance!
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Old 09-28-15, 03:23 PM   #34
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Default Re: Dual STi radiator cap?

137kpa (roughly 1.3 bar) is the OEM radiator cap pressure on the STI. The 108kpa is the upper res cap.

Not sure if the pressures are the same for the WRX.

That said, i would not stray from OEM.
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Old 09-28-15, 04:01 PM   #35
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Default Re: Dual STi radiator cap?

Quote:
Originally Posted by BlueScooby View Post
137kpa (roughly 1.3 bar) is the OEM radiator cap pressure on the STI. The 108kpa is the upper res cap.

Not sure if the pressures are the same for the WRX.

That said, i would not stray from OEM.
Oh I did not know that, so my 1.1 on my rad cap should he 1.3? I'm estranged to wonder how a 1.1 cap ended up on my car in the first place. I did buy the car from someone last year but I did the rad replacement (and of course ditched the 1.3 Mishimoto cap) and used the cap that was already on the car (1.1)... I'm not overheating or anything but I did notice little bubbles burping every few odd seconds into the plastic overflow tank next to the rad(like every 5seconds it would bump a little bubble), could I be boiling over a tad bit? I will go to Subaru stealership tomorrow and get a 1.3 OEM cap. Now I am getting somewhere with this. Thanks again in advance.
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Old 09-28-15, 04:04 PM   #36
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Default Re: Dual STi radiator cap?

That is odd...

FWIW, id grab a new OEM cap for both just to have new/fresh ones... I recently had to replace a cap that wasn't functioning properly. Im in favor of replacing cheap stuff before it breaks...
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Old 09-28-15, 04:13 PM   #37
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Default Re: Dual STi radiator cap?

Quote:
Originally Posted by BlueScooby View Post
That is odd...

FWIW, id grab a new OEM cap for both just to have new/fresh ones... I recently had to replace a cap that wasn't functioning properly. Im in favor of replacing cheap stuff before it breaks...
Right, am I the same... Preventive measures... So just to clarify, I should replace both rad with the OEM 1.3 and get a new 108kpa(1.1) for the upper res...yes? Just for safe measure...
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Old 09-28-15, 04:18 PM   #38
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Default Re: Dual STi radiator cap?

You got it
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Old 09-28-15, 04:31 PM   #39
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Default Re: Dual STi radiator cap?

Quote:
Originally Posted by BlueScooby View Post
You got it
Thanks Blue, you've been helpful.
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Old 09-28-15, 04:32 PM   #40
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Default Re: Dual STi radiator cap?

No prob!
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