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Old 07-15-2003, 06:33 PM   #1
stimpy
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Default Aftermarket Radiator Possibilities

I noticed a thread in the FFI forum that listed out a number of possibilities for radiator upgrades, but they were all GG/GD specific. Since it is my understanding that the endtanks are different and yield different mount points, they would not work for the GC/GF chassis.

I have seen posts from the WRX guys indicating huge 30+ F degree differences on their watertemp. Have any of you noticed a limit in your RS cooling system? MRT indicates a 10 degree ( Celcius?) difference in coolant temp.

The coolant capacities vary greatly between the different Imprezas so I'm anticipating the worst and figuring my L radiator is going to be a lot smaller than an RS radiator. This has spurred my investigation since my WRX drivetrain is shipping out soon.

Also, do any of you know of aftermarket radiator solutions that work with the GC/GF?

The list I have is as follows:
  • C&R
    50.8mm thick, 1-row design, comes with new SPAL fans and reservoir tank. $650+s/h from kastleskorner.com and teaguesauto.com. Suitable for naturally aspirated applications (GC4, GC6, GF4, GF6, etc) due to filler cap on radiator core. Possible special order for WRX (GC8, GCA, GF8, GFA, etc) swap applications not needing the first filler cap.
  • MRT
    32 mm thick, unknown # rows, reuse stock fans, $500+s/h from isrperformance.com. Unavailable for naturally aspriated applications
  • Fluidyne
    No application for GC/GF chassis.
  • PWR
    No application for GC/GF chassis.
  • Koyo
    Suitable for naturally aspirated applications (GC4, GC6, GF4, GF6, etc) due to filler cap on radiator core. Unknown price from z1auto.com

Now, in hearing from others the PWR is very attractive due to both price and reviews, however the source only sells it for the USDM WRX. The C&R looks really beefy, but very pricey. Also of note, the C&R readily available is for the naturally aspirated versions that require a fill cap located directly on the radiator. They do have others overseas though. The MRT appears to come without the fill cap for WRX swaps, but not many details are indicated.

-Jon
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Last edited by stimpy; 07-16-2003 at 03:25 PM.
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Old 07-15-2003, 07:09 PM   #2
kastle
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I had heard that Fluidyne and Koyo had radiators for the GC chassis, but I haven't been able to find anyone that sells them, same deal with the PWR. I've tried all my import contacts for parts and haven't been able to sources anything... And that's what lead me to C&R... and creating a account with them to sell the WRX & GC8 Radiators.

I haven't had any problems with the one that I installed into my RS-T. I like it, works well with Forced Induction...
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Old 07-16-2003, 02:42 AM   #3
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i have it on good authority that you can make a 04 WRX Radiator work
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Old 07-16-2003, 10:26 AM   #4
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I am using a KOYO dual core aluminum radiator that I was told was made for the 1.8L Impreza. Back than there weren't any choices for the GC chassis so I bought it anyway because I race my car at the track often and wanted some extra safety against overheating. It turns out that everything fitted perfectly except for the MY2000 RS radiator fans. Some slight modifications were required to fit those and if you decide to use aftermarket fans, you'll have to modify it anyway. I highly recommend using aftermarket fans that are much slimmer. This radiator is so thick that the stock fans are pushed very close to the FEAD belts. Here are some pics of mine.
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Old 07-16-2003, 10:53 AM   #5
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Jeremy, is there anything different for the MY04 radiator than doing what yamarocket630 did with his MY02 WRX radiator? Supposedly you can source a WRX radiator, remove the endcaps, then reuse your existing endcaps and achieve the same results. It wouldn't be a monster radiator but it would definitely be larger than the current RS/L radiators.

You can read about that here and see lots of pictures about it here.

-Jon

Last edited by stimpy; 07-16-2003 at 10:58 AM.
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Old 07-16-2003, 01:36 PM   #6
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Quote:
Originally posted by stimpy
Jeremy, is there anything different for the MY04 radiator than doing what yamarocket630 did with his MY02 WRX radiator? Supposedly you can source a WRX radiator, remove the endcaps, then reuse your existing endcaps and achieve the same results. It wouldn't be a monster radiator but it would definitely be larger than the current RS/L radiators.

You can read about that here and see lots of pictures about it here.

-Jon
yes you just bolt it in and change a couple coolant hoses, he actually changed the end tanks which is WAY more work and my theory is, if i am going tp put that kinda time in i am going bigger and thicker

i've already spoken with a vendor on this board about getting PWR to make the 04 radiators, they have the cap in the top tank so no need to swap the tanks over.

jeremy
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Old 07-16-2003, 02:07 PM   #7
stimpy
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I actually don't need the cap on the top of the tank, so that really isn't a concern. Though I do remember some people talking about having problems bleeding the coolant system without the cap on the radiator. Subaru added one in 2003 so there must have been some reason. I guess, if the concern is getting the coolant up to the remote reservoir, it would be nothing more than purchasing a 2003 radiator cap.

Does the 04 have different mount points or what exactly is different between the GC and GD chassis? I'm almost to the point of just ordering the MY02-03 PWR radiator and making it fit...

-Jon
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Old 07-16-2003, 02:50 PM   #8
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there isn't much difference, i haven't had the chance to verfy that the fans 100% directly bolt up but the radiator lines up with the stock RS one. if you don't need the radiator cap then you are set, the MY04's are the same as the late 03's with the twin cap system.

jeremy
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Old 07-16-2003, 03:29 PM   #9
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I'm waiting on Pam at isrperformance.com to get back with me on the MRT applications. I'll probably take the plunge shortly afterwards. I'd like to keep the ghetto-rigging to a minimum.

Just to confirm, you are saying that the mounting tabs are the same for the USDM WRX and the only difference may be fan mounts and the exclusion of the radiator cap?

-Jon
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Old 07-16-2003, 03:36 PM   #10
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Stimpy:

If you want, I can take some pictures of the WRX radiator installed on my STi conversion. Just let me know!
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Old 07-16-2003, 06:22 PM   #11
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You can save the money and buy an oil cooler. It is in contact with more moving parts than the coolant. And you can buy the b&m kits from jegs, summit @ 130$

Last edited by Tim Sanderson; 07-16-2003 at 06:27 PM.
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Old 07-17-2003, 02:14 AM   #12
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Quote:
Originally posted by stimpy
I'm waiting on Pam at isrperformance.com to get back with me on the MRT applications. I'll probably take the plunge shortly afterwards. I'd like to keep the ghetto-rigging to a minimum.

Just to confirm, you are saying that the mounting tabs are the same for the USDM WRX and the only difference may be fan mounts and the exclusion of the radiator cap?

-Jon
MRT= REbadged PWR

you may have to get the radiator mounts for an RS but yes everything is the same except the radiator cap.

jeremy
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Old 07-17-2003, 04:10 AM   #13
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I know this won't really help but During my time in Japan I went to a couple of car shows and also car part bizzars, and found several, probably about 2 or 3, places that sold upgraded radiators for the GC8 (wrx). Now of course I dont' have that info anymore (threw it all away) BUT if the old style wrx (gc8) has the same radiator then there are actually quite a few options out there for us.
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Old 07-17-2003, 01:22 PM   #14
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Tim, my car will already have an oil cooler, it has one from the factory. The engine is a MY03 EJ20. This would be why I was asking about radiators, not oil coolers.

Ethan, the mount points for any GC/GF chassis are the same. From 1993-2001 all Imprezas were either a GC, GM, or GF chassis; worldwide. The trick is that the GC8/GF8 cars did NOT have a radiator cap on the top of the radiator. They utilize a remote reservoir; one that can be purchased from MRT I might add. It is more of a matter of finding somebody that actually knows enough to go find the GC8/GF8 radiators for us. Pam at isrperformance.com and Adam at z1auto.com are the only two I know of right now that can source the GC8/GF8 radiators.

Quote:
you may have to get the radiator mounts for an RS
Ok, so the mounts are or are NOT the same? Basically, if I purchased a PWR radiator for a WRX, what needs to be altered to mount it into the car? Are the fan mounts different? Radiator mount mount locations different? Coolant lines? I'm confused...

*note, when referring to GC8/GF8 I am NOT referring to just the GC/GF chassis, but the WRX's that came configured as such. A GC6 is NOT the same as a GC8.
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Old 07-17-2003, 08:06 PM   #15
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Stimpy, The factory oil cooler is junk. It cools the oil with the radiator coolant. This alone can increase your coolant temps somewhat, though not much because it's such a small exchanger. I would remove it. A properly sized liquid to air oil cooler can reduce engine temps dramatically.

Good luck with your search.
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Old 07-17-2003, 08:45 PM   #16
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Cacaphony, I would like a couple pictures if you wouldn't mind.

Anybody happen to have the RS core thickness? My L is 16mm, the WRX is 22mm.

-Jon
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Old 07-17-2003, 08:48 PM   #17
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Quote:
Originally posted by Tim Sanderson
Stimpy, The factory oil cooler is junk. It cools the oil with the radiator coolant. This alone can increase your coolant temps somewhat, though not much because it's such a small exchanger. I would remove it. A properly sized liquid to air oil cooler can reduce engine temps dramatically.

Good luck with your search.

Is there a drop in pressure when an oil cooler is installed. And where would be a good place to source the oil from?
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Old 07-17-2003, 10:09 PM   #18
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Tee from the pressure sending unit with a 60 thousandths restrictor. I did this for remote oil filtration and my oil pressure on that line is 63psi cold & 18psi warm, both at idle. When warm it's 60psi at 2k rpm.
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Old 07-17-2003, 10:40 PM   #19
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I have installed the Koyo 3 row GC8 radiator in a WRX. Simply had to swap the top hose. The Koyo is gorgeous and works very well. Z1 can get these.
Kevin
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Old 07-17-2003, 11:07 PM   #20
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Quote:
Originally posted by SubaFastR
I have installed the Koyo 3 row GC8 radiator in a WRX. Simply had to swap the top hose.
Fans mount up the same between the WRX and the GC radiator? If so, that is excellent news.

-Jon
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Old 07-18-2003, 02:54 AM   #21
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Quote:
Originally posted by stimpy

Ok, so the mounts are or are NOT the same? Basically, if I purchased a PWR radiator for a WRX, what needs to be altered to mount it into the car? Are the fan mounts different? Radiator mount mount locations different? Coolant lines? I'm confused...
it's the upper radiator core mountingpoints, you have the bolt holes on the core support. You just need hte bracket.

jeremy
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Old 07-18-2003, 10:40 AM   #22
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Any verification on fan mounts? I'll go out and take a look at my car afterwards and I'll probably order a PWR radiator once I think everything will work.

-Jon
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Old 07-18-2003, 12:55 PM   #23
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i will see if i can borrown a friends stock radiator and do a lil test fitting.

jeremy
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Old 07-18-2003, 01:35 PM   #24
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Thanks Jeremy.

-Jon
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Old 07-18-2003, 03:30 PM   #25
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At the very least, the upper radiator mounts are different from the GC mounts, as you said Jeremy. However, it doesn't look like the bolt holes exist on the GC chassis (atleast not on my GF and not on Boostup!'s GM). There are some 'bumps' raised on the front radiator support there, but no holes that I can see. I didn't poke the bumps to see if they were just stickers or something, but they looked like metal all the way through. The bumps I am referring to are here:


The other thing to note is I browsed through all of yamarockets images and I found a picture of the RS fans on the WRX radiator. The WRX radiator uses different fan mounts, but the RS fans have those holes. The RS uses staggered (front to back) holes where the WRX uses all inline holes. Note the unused staggered fan mounts:


You guys sick of me yet?
-Jon
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