Radiator Caps - Subaru WRX Forum
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post #1 of 19 Old 08-24-2011, 12:35 PM Thread Starter
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Radiator Caps

I have a coolant leak coming from the top of the radiator. Really cant find where its coming from. Believe it may be the cap going bad. I've been looking for caps but there so hard to find. There out there but i'm not sure which is a good one or not?! can someone help me pick one out. My car is tuned to 22psi and im seeing caps rated for 18 psi, are these not strong enough? IAG Performance: Mishimoto Carbon Fiber 1.3 Bar Rated Radiator Cap, Cooling, MMRC-CF13S <<< will this one work?
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post #2 of 19 Old 08-24-2011, 01:40 PM
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What does you being tuned for have to do with anything? You're running boost thru your coolant system? :eek:

$40 for a knock off cap? You can get a name brand one for half that.
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post #3 of 19 Old 08-24-2011, 04:36 PM Thread Starter
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i wasnt sure if more boost would have any effect on flow of coolant. didnt know if all cars have sma eflow or if there was something that helped with flow. What brand of cap would you get?
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post #4 of 19 Old 08-24-2011, 06:18 PM
 
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From my experience at the shop, aftermarket caps are a common fail. Drop $15 on the correct OEM from a dealer. Make sure you get the right one (108 Kpa)

Cullen
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post #5 of 19 Old 08-24-2011, 07:53 PM
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The pressure they are refering to is not from your turbo. Different pressure. Its the pressure build up they are refering to is in the radiator.

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post #6 of 19 Old 08-25-2011, 12:22 PM
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I did a bit of reading about aftermarket radiator caps a while back since I was interested in adding some under-hood bling, but decided against it due to potentially overpressurizing the system. The stock radiator has plastic end tanks which are likely to crack if the pressure is increased much beyond stock specs. The system already experiences some fairly significant heat/pressure cycles as the car is driven and you should really only consider an aftermarket radiator cap if the stock radiator, hoses, and thermostat are also upgraded.

It appears that SubaruGenuineParts.com has a stock radiator cap in the OEM catalog under: Parts - Cooling - Radiator & Components - Cap for $13.85 (probably plus shipping)

Good luck!

John
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post #7 of 19 Old 08-26-2011, 02:42 PM Thread Starter
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the last three guys that posted, thanks for your help! It all makes sense what you are telling me. I just ordered a 1.3 bar Mishimoto, as seen here -
Amazon.com: Mishimoto MMRC-13L Large 1.3 Bar Rated Radiator Cap: Automotive Amazon.com: Mishimoto MMRC-13L Large 1.3 Bar Rated Radiator Cap: Automotive

Ill just keep this sitting around till i can upgrade the radiator itself, incase it isn't the cap leaking, and just buy a stock one
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post #8 of 19 Old 08-26-2011, 03:26 PM
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Pick up a mishimoto radiator... They are WAY better than the stocker.

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post #9 of 19 Old 08-26-2011, 03:55 PM
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Quote:
Originally Posted by pzr2874 View Post
Pick up a mishimoto radiator... They are WAY better than the stocker.
I beg to differ. My stocker lasted 95k miles. My Mishimotor rebadge had 3 failures in 10k miles.

There is no reason not to get a Koyo if you need a radiator.
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post #10 of 19 Old 08-26-2011, 07:44 PM Thread Starter
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I dont want to spend $500 bucks on a koyo tho. i was hoping maybe $300 max.
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post #11 of 19 Old 08-26-2011, 07:47 PM Thread Starter
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do you guys have any info on Gimmick Motorsports or Fast Motorsports radiators? Or what radiator would be the best bang for $300?
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post #12 of 19 Old 08-26-2011, 11:28 PM
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Quote:
Originally Posted by rotheee View Post
I dont want to spend $500 bucks on a koyo tho. i was hoping maybe $300 max.
Um, guess how much Koyos cost....
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post #13 of 19 Old 08-26-2011, 11:49 PM
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Quote:
Originally Posted by brfatal View Post
Um, guess how much Koyos cost....
OOO OOOOO OOOO , I know.......... A little over $300 KOYO Radiator R2704 03-07 Subaur Impreza WRX amp; Sti...USD339.10/Piece Wholesale Price at DHgate.com
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post #14 of 19 Old 08-27-2011, 01:51 AM Thread Starter
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not too bad, the one i seen first after the post was right around 500. guess i better start savingg
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post #15 of 19 Old 08-27-2011, 07:29 PM
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