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06-13-2005, 02:07 PM | #1 |
Scooby Guru
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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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06-13-2005, 02:10 PM | #2 |
Scooby Specialist
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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. |
06-13-2005, 02:47 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... |
06-13-2005, 02:52 PM | #4 |
Scooby Guru
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uhh no. The subaru ones seems to look ALMOST the same on the bottom...
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06-13-2005, 02:54 PM | #5 | |
Scooby Guru
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Quote:
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06-13-2005, 03:22 PM | #6 |
Big Ron
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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: |
06-13-2005, 03:37 PM | #7 |
Scooby Guru
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I'm not worried, will this mod work?
Are the radiators on the 04-05 WRx's any newer (stonger)? |
06-13-2005, 03:38 PM | #8 |
Miss You Mom
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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 .
Brian |
06-19-2005, 02:34 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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06-19-2005, 09:46 PM | #10 |
Scooby Specialist
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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. |
06-30-2005, 01:13 PM | #11 |
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bump for more opinions!
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06-30-2005, 01:22 PM | #12 | |
Miss You Mom
Oct 1940 - Feb 2008 Super Moderator Member#: 809
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Quote:
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. Brian |
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06-30-2005, 02:00 PM | #13 |
Scooby Guru
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Thanks Brian, your Subie knowledge is much appreciated
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06-30-2005, 02:25 PM | #14 |
Miss You Mom
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06-30-2005, 03:36 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. |
06-30-2005, 03:41 PM | #16 |
Miss You Mom
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06-30-2005, 03:47 PM | #17 | |
Scooby Specialist
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Quote:
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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06-30-2005, 05:31 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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06-30-2005, 05:34 PM | #19 |
Miss You Mom
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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.
Brian |
06-30-2005, 06:00 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. |
06-30-2005, 06:42 PM | #21 |
Scooby Specialist
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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. |
07-01-2005, 09:22 AM | #22 |
Former Vendor
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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 10:17 AM. |
07-20-2005, 03:45 PM | #23 |
Scooby Newbie
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Vehicle:2006 Legacy GT Wagon White |
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 |
07-20-2005, 05:34 PM | #24 | |
Scooby Specialist
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Quote:
bump for an answer. This is my exact scenario right now. |
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07-21-2005, 01:45 PM | #25 |
Scooby Newbie
Member#: 32010
Join Date: Jan 2003
Location: so cal
Vehicle:2006 Legacy GT Wagon White |
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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