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Old 03-02-2012, 07:57 PM   #1
DerekDaniel
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Default STI high pressure cap

I bought a STI high pressure cap (ST4511355010) My car is a 2007 subaru wrx, with sock front radiator. Can I use this cap? some places say yes on the radiator, others say use it by the top mount, yet others say do not on stock radiators!!!!!! What is it does anyone know for sure? If not I will just throw this thing away rather than risking harm to my car and blowin hoses and radiators. Thanks for any professional advice and empirical evidence
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Old 03-03-2012, 01:14 AM   #2
Rally Monkey
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Originally Posted by DerekDaniel View Post
I will just throw this thing away
I will send you $2.35 plus shipping for it.
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Old 03-03-2012, 01:38 AM   #3
Jubert39
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Quote:
Originally Posted by DerekDaniel View Post
I bought a STI high pressure cap (ST4511355010) My car is a 2007 subaru wrx, with sock front radiator. Can I use this cap? some places say yes on the radiator, others say use it by the top mount, yet others say do not on stock radiators!!!!!! What is it does anyone know for sure? If not I will just throw this thing away rather than risking harm to my car and blowin hoses and radiators. Thanks for any professional advice and empirical evidence
is it circular or is it circular with 2 ear things on the sides... if its got the ears, it goes on top of the coolant reservoir tank (up top near the turbo area). If its perfectly round, you can just mount it to the bottom part (that attaches to the plastic (stock) radiator).
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Old 03-03-2012, 11:33 AM   #4
DerekDaniel
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Ok cool thanks it has two lil ears so top mount res. I read on another forum to do the same thing. Where did you get your info? i am just uncertain because of so much contradictory info out there..
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Old 03-03-2012, 12:02 PM   #5
DerekDaniel
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Why would you wanna raise the pressure of the intercooler and not the radiator? It seems to small to really make a difference, unlike bigger front mount. can I use this if I have a stock intercoolers? I have heard yes and no? anyone know about this. Thhanks
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Old 03-03-2012, 02:16 PM   #6
2Fast4U1DAY
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Quote:
Originally Posted by DerekDaniel
Why would you wanna raise the pressure of the intercooler and not the radiator? It seems to small to really make a difference, unlike bigger front mount. can I use this if I have a stock intercooler? I have heard yes and no? anyone know about this. Thhanks
You aren't doing ANYTHING to your intercooler. That top tank is the coolant reservoir. It has nothing to do with the intercooler. We don't have AWIC. We are air to air.

I suggest before you go buying anything for your car from here on out, you should consult a professional, as you CLEARLY don't have the slightest clue of what you are doing.

What was the reason for needing the cap anyway? Just to say you have Sti parts on your WRX?

Last edited by 2Fast4U1DAY; 03-03-2012 at 04:13 PM.
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Old 03-03-2012, 11:37 PM   #7
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What does the Cooling System FAQ tell you about this subject....you DID read the sticky threads BEFORE posting right????
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Old 03-04-2012, 12:11 AM   #8
DerekDaniel
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Yeah the sticky facts arent clear and are vague thats why I am asking for clarification and intercooler was used as a loose term lol dont get your panties in a bunch. Plus I had money falling off my money tree so I bought this shiny pink cap to put on my car not realizing it could EFF stuff up. Sorry I did not consult my dad or a professional prior to this purchase Shame on me for not finding my answer in the FAQs. Does anyone else want to take their stress out on me?
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Old 03-04-2012, 12:16 AM   #9
DerekDaniel
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According to the sticky FAQ
"What about higher pressure radiator caps? Higher pressure radiator caps increase the boiling point of your coolant. Higher pressure = higher boiling point. Higher coolant pressures also transfer heat from the cylinder heads more efficiently. There have been several reported cases of higher pressure radiator caps causing ruptures in the endtanks on any OEM Subaru radiator. These should generally be reserved for aftermarket radiator users.
See vague.

Ps I bought this thing cuz I beat the hell out of my car and thought it would help it keep from overheating in the hot ass summer due to increased temp.

Last edited by DerekDaniel; 03-04-2012 at 12:23 AM.
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Old 03-04-2012, 02:24 AM   #10
TommyAtomic
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This sounds a bit like a Troll post. I dont want to believe that the OP is rooting around under the hood and messing about when he doesn't know the difference between a radiator and an intercooler.

I'm slightly shocked that he quoted the exact Part of the FAQ specifically answering his original question. I'd like to say I'm stunned but im not.

If there are issues with overheating then a radiator flush, refill with appropriate coolant and burp is called for. Possibly a heavier weight engine oil unless the recommended weight oil is not being used in which case stop letting them put 5w30 in the car when your mom takes it to jiffy lube.

If properly maintained the factory coolant system is sufficient to deal with the factory engine power output. A high pressure Rad cap is no substitute for proper maintenance. If the engine is making additional power in a warmer climate without appropriate upgrades to the cooling system (aftermarket radiator, oil cooler) then you kind of had it coming.
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Old 03-04-2012, 10:56 AM   #11
DerekDaniel
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not all my questions were answered by that FAQ either. did ya ever imagine that? JUBERT thanks for your response
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Old 07-26-2014, 03:49 AM   #12
gunman-13
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what I don't understand is that everybody(90%)of the people keep taking down the STI cap, and also keep saying: use the stock one....
like, these STI caps were made by STI, right?Does this mean the engineers working at SUBARU TECHNICA INTERNATIONAL ,the pinnacle of subaru engineering, are half goofed know nothings, that would risk selling a part that might destroy your cooling system, and therefore endanger the life of your engine???
Sounds verrrrryy strange to me...


oh yes, to the old aunties out there:

f*ck the fact that this is a two yr. unanswered old thread.
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Old 03-17-2015, 05:08 PM   #13
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Quote:
Originally Posted by gunman-13 View Post
these STI caps were made by STI, right?Does this mean the engineers working at SUBARU TECHNICA INTERNATIONAL ,the pinnacle of subaru engineering, are half goofed know nothings, that would risk selling a part that might destroy your cooling system, and therefore endanger the life of your engine???
Sounds verrrrryy strange to me...
They designed the STI cap for brand new cars with perfect maintenance. They don't consider 13 year-old bugeyes with heat-cycled radiators.

The simple fact is, if your cooling system (hoses, radiator, etc) isn't brand new, there is a chance that the increased pressure may cause your old, heat-cycled, brittle end tanks to finally fail.

Last edited by car_freak85; 03-19-2015 at 11:37 AM.
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