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Old 06-13-2005, 03:07 PM   #1
djerickd
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Default Benefits from using the radiator cap from a new model WRX on a 2002? (higher Bar/kPa)

Reason I ask is I noticed the radiator cap on my 02 shows 1.1 Bar (110 kPa: I'm assuming here) as it's rating, on the newer WRX's that have 2 caps the front cap reads 137 kPa (1.37 BAR!) and the one over the turbo reads 108 kPa (1.08 bar). Would it be beneficial for me to run the round cap (1.37 bar) on my 02 WRX? Cheaper than aftermarket right?

pics of Crucial, and the 2 caps from the newer models pictured from 2004 WRX with dual radiator caps:



Am I onto something here?
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Old 06-13-2005, 03:10 PM   #2
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Does the cap you have now allow coolant to spew out while driving or better yet, after you shut the car off?

Apply answer to your question.
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Old 06-13-2005, 03:47 PM   #3
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if you use two round caps you net a higher system pressure.

they're just harder to take off! slippery glycol...

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Old 06-13-2005, 03:52 PM   #4
djerickd
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uhh no. The subaru ones seems to look ALMOST the same on the bottom...





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Old 06-13-2005, 03:54 PM   #5
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Quote:
Originally Posted by ride5000
if you use two round caps you net a higher system pressure.

they're just harder to take off! slippery glycol...

I only need one cap I'm an 02
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Old 06-13-2005, 04:22 PM   #6
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http://forums.nasioc.com/forums/show...hreadid=504002

The benefit of a better cap it will increase your likelyhood of buying a new radiator. :shrug:
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Old 06-13-2005, 04:37 PM   #7
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I'm not worried, will this mod work?

Are the radiators on the 04-05 WRx's any newer (stonger)?
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Old 06-13-2005, 04:38 PM   #8
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Unless you have an all-aluminum radiator, don't bother as Unabomber said. The stock radiators with crimped end tanks usually leak at the seam when you increase the cap pressure, as fluid that would normally go into the overflow cannot escape and leaks out at the radiator tank seam. That is why my STi cap (glad I didn't pay for it ) is in my toolbox, not on my radiator .


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Old 06-19-2005, 03:34 AM   #9
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I've had the 1.4 bar crucial cap for over a year, no leaks yet. I originally bought it thinking that it would give me an excuse to get a new radiator. It hasn't leaked so I haven't bought that new pwr radiator......yet.
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Old 06-19-2005, 10:46 PM   #10
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The issue with failing radiators was a problem not associated with radiator caps, but more with poor quality. I believe Subaru issued a TSB to correct the problems with the older radiators.

Crucial has never had a complaint in regard to our radiator caps.
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Old 06-30-2005, 02:13 PM   #11
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bump for more opinions!
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Old 06-30-2005, 02:22 PM   #12
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Quote:
Originally Posted by MisterX
The issue with failing radiators was a problem not associated with radiator caps, but more with poor quality. I believe Subaru issued a TSB to correct the problems with the older radiators. Crucial has never had a complaint in regard to our radiator caps.
So what you're saying is that when you increase the pressure in the system by putting on a cap that opens at a higher pressure level- a level the radiator was not designed to contain- and the radiator leaks, that the cap had nothing to do with it? Can I have some of what you're smoking ? The TSB addressed an issue with the endtank design and overflow containment- it did not address the fact that the stock radiator is a core with crimped on plastic endtanks- endtanks that leak at the crimp, especially when the coolant system is subjected to higher than designed for pressures. Do you know how often we replace a radiator when a car has overheated because of headgasket leaks? Just about every time- the endtank crimp splits, and poof! You need a new radiator. What happens when the car overheats like that? The radiator is subjected to greater than usual pressures (like when you throw a 1.3 bar cap in) and the radiator leaks from the crimp. People aren't saying "don't put the cap on" to cut your profits- we're saying it from actual experience.

I work at a very mod friendly dealership- I see the effects of a higher pressure caps all the time. I had a leak with my STi cap (1.3 bar) that went away as soon as the cap was replaced with the stock one. It's not a quality problem with the radiators (not after the 02 model year anyway)- it's the fact that they are not designed to hold 1.3 and 1.4 and greater bar of pressure. Some will hold it, some won't. Some cars blow headgaskets, some don't.


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Old 06-30-2005, 03:00 PM   #13
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Thanks Brian, your Subie knowledge is much appreciated
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Old 06-30-2005, 03:25 PM   #14
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You are most welcome! I do recommend higher bar caps for all-aluminum radiators, as the rest of the system can handle the pressure. For the OEM radiators? I personally wouldn't risk it .


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Old 06-30-2005, 04:36 PM   #15
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*whew* glad I saw this thread, I was just about ready to do a coolant flush this saturday and install that STi 1.3 bar cap.

Great...now I've got a useless radiator cap lying around...meh, I guess it'll make for an interesting desk ornament.
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Old 06-30-2005, 04:41 PM   #16
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If you have two radiator caps (one on the tank, one on the radiator) you can put it on the tank- the lower pressure one on the radiator will still open before the higher one and you'll still have the new hotness .


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Old 06-30-2005, 04:47 PM   #17
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Quote:
If you have two radiator caps (one on the tank, one on the radiator) you can put it on the tank- the lower pressure one on the radiator will still open before the higher one and you'll still have the new hotness .
You're a genius. So I guess both the radiator caps are the same size. Will it make ANY sort of difference if I put the STi one on the tank? My gut feeling is the answer is no, but I might as well ask.

I still gotta do some searching on how the cooling system works. Why are there two caps? What's the purpose for the cap on the tank?
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Old 06-30-2005, 06:31 PM   #18
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yeah why 2 caps??? should I upgrade my radiator to the newer version? Subaru did it for a reason!
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Old 06-30-2005, 06:34 PM   #19
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The tank is the proper fill/burp point for the system. The radiator, IMHO, shouldn't even have a cap on it, but oh well . The one STi cap alone on a car with two caps won't do any good, but it won't do any harm either- purely a bling factor. As for changing the radiator? I wouldn't do it unless you A) got it used and cheap (you need all the tubes too) or B) you have a blown radiator already. The cost doesn't really justify a "what the hell" purchase, especially when aluminum radiators are obtainable for only $100 or $200 more than OEM.


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Old 06-30-2005, 07:00 PM   #20
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my '04 radiator leaks at the seam and i have the stock cap. i think the stock radiator is poorly made and an aftermarket cap will just make the possibilty of failure even higher.

i had my honda for 9yrs and 125K and even had a motor swap in it, never had a problem with the radiator.
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Old 06-30-2005, 07:42 PM   #21
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yeah i know the tank cap is where you should fill it up, but I haven't come across anything that tells what the cap on the radiator does. It doesn't seem to have much of a purpose...at the very least, would opening it help coolant drain out faster?

well I know it's bling, but heck, I already have, I might as WELL use it. It's better that it serves as under-the-hood bling than on-the-desk bling.
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Old 07-01-2005, 10:22 AM   #22
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The best way to refill a coolant system and not get air pockets on MY02 cars and those without radiator caps is to disconnect the line running from the turbo coolant reservoir at the nipple on the radiator and clamp it. Begin filling at the Turbo coolant reservoir with the car running and the heater turned on. When coolnt appears at the nipple on the radiator, turn the car off and reconnect the hose. The system should be air free.

That's whay there is a radiator cap on the radiator on later model cars. It allows a refill without removing the hose.

The 1.4 bar cap we sell is intended to be installed on the turbo coolant reservoir. The radiator failures that were reprorted early on were due to defective radiators. I believe a TSB was issued to correct the problem. The later model cars are not supposedly affected.

Last edited by Crucial Racing; 07-01-2005 at 11:17 AM.
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Old 07-20-2005, 04:45 PM   #23
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background:
i have the MY 02 radiator and developed the leaking seam on the top end tank while running the stock radiator cap. since i was past the warranty when this occurred, i decided to spend the extra ~$100 for the koyo full aluminum radiator. i figured this would decrease the probability of having the same problem occur in the future.

question:
the koyo radiator requires a cap like the MY03-present OEM radiators. since i don't have one, i was thinking of buying the STi/SPT radiator cap. however, i believe the STi/SPT cap is rated at 1.3 bar, which is less than the 1.37 (137kPa) the stock OEM cap is. i'm guessing the stock cap would be less expensive. what would be the best solution performance wise? i'm assuming that the fitment to both caps on the radiator and reservior are the same. so i suppose some possibilities are:

1. leave the MY02 OEM cap on the reservior and use the STi (1.3bar) cap on the radiator
2. leave the MY02 OEM cap on the reservior and use the MY03-present OEM (1.37bar) cap on the radiator
3. replace both caps with either the STi or MY03-present caps

thanks for your help
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Old 07-20-2005, 06:34 PM   #24
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Quote:
Originally Posted by LTSmash
background:
i have the MY 02 radiator and developed the leaking seam on the top end tank while running the stock radiator cap. since i was past the warranty when this occurred, i decided to spend the extra ~$100 for the koyo full aluminum radiator. i figured this would decrease the probability of having the same problem occur in the future.

question:
the koyo radiator requires a cap like the MY03-present OEM radiators. since i don't have one, i was thinking of buying the STi/SPT radiator cap. however, i believe the STi/SPT cap is rated at 1.3 bar, which is less than the 1.37 (137kPa) the stock OEM cap is. i'm guessing the stock cap would be less expensive. what would be the best solution performance wise? i'm assuming that the fitment to both caps on the radiator and reservior are the same. so i suppose some possibilities are:

1. leave the MY02 OEM cap on the reservior and use the STi (1.3bar) cap on the radiator
2. leave the MY02 OEM cap on the reservior and use the MY03-present OEM (1.37bar) cap on the radiator
3. replace both caps with either the STi or MY03-present caps

thanks for your help

bump for an answer.

This is my exact scenario right now.
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Old 07-21-2005, 02:45 PM   #25
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MT_WRX,

have you had any progress on your radiator cap decision? are you changing your thermostat? also, do you have good installation instructions with detailed pictures? i have the basic idea on how to do the job, i just like to have a lot of pictures to go along with the verbage.
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