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Old 03-27-2012, 01:46 AM   #1
mcwc
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Default Aftermarket radiator & fans for GC8 Swap

I am looking at replacing my STI radiator in my GC8 swap. I would like to go away from the center located top rad hose port, a hacked up 2.5RS fans, and zip ties set up. I've driven with this radiator set up for about 2.5 years and for about 1 year by the previous owner. If you can see it in the picture below, the passenger fan is being lifted off the radiator.



I've searched thru the conversion board and I'm either going to go with a Koyo R2218 or a Mishimoto GC8 aluminum radiator and OEM rubber hoses.

I can't find much info on what fans to use. I don't want to cheap out on fans and I am willing to spend money on a reliable fan set up. I would keep my AC. Which slim fans should I go with?

BTW, am I able to reuse my factory overflow tank or would I have to find something else?


Thanks!
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Old 03-27-2012, 09:11 AM   #2
KONKILR
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I dont see why you cant just use the stock fans. My swap has a fluidyne with the stock wrx fans ans they fit fine.

jake
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Old 03-27-2012, 11:36 AM   #3
mcwc
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I don't have WRX fans. The current fans are the stock 2.5RS fans with some of the mounting tabs cut off so it can fit the GD STI radiator.

I am able to get a set of V7 STI rad fans but with the thicker cores (~53mm) in the Koyo and Mishimoto GC8 radiators, I am concerned about clearance.

My buddy is running a Mishimoto GD radiator (~42mm core) and aluminum fan shroud in his SF5 swap. We had to remove the spacers from the fans and the clearance is still really tight.
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Old 03-28-2012, 02:32 AM   #4
Loomin
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im running a mishimoto and slim FAL style fans. works well.
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Old 03-28-2012, 11:01 AM   #5
mcwc
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Hey Chris, which model of Mishimoto radiator and FAL fans are you running? I may just have to copy your set up
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Old 03-28-2012, 01:54 PM   #6
stsdude2
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why do you have 2.5rs fans in an STI? where are the STI fans?
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Old 03-28-2012, 03:36 PM   #7
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Quote:
Originally Posted by stsdude2 View Post
why do you have 2.5rs fans in an STI? where are the STI fans?
FAIL...
Look at his thread title...
It's in a swapped gc.
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Old 03-30-2012, 01:26 PM   #8
mcwc
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Hmm....has anybody used the Mishimoto FXT rad in their swap?
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Old 03-31-2012, 10:12 AM   #9
Jaxx
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i have the koyo + a fmic i ended up selling the gc8 fans i had and going to slim pusher fans from summit racing (no ac)

mine are also set to always on ..
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Old 04-01-2012, 03:31 AM   #10
scubynoob
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you always could mount the FAL fans in a pusher configuration if clearance will be an issue
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Old 04-06-2012, 10:55 AM   #11
NFJ79
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This weekend I plan on installing my new Mishimoto GC8 radiator. I'm also going to be replacing my beaten up AC condenser. I am going to try and fit a set of metal 98 RS fans and have a set of ebay slims as a back up plan.
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Old 04-06-2012, 03:32 PM   #12
mcwc
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Oh cool, let me know how those RS metal fans fit. I've read about them but nobody has said anything about fitment.
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Old 04-08-2012, 03:21 PM   #13
Drewbie
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I ordered up the mishimoto radiator and fan shroud specific to the gc.. I also have a STi Koyo that's Layin around. I'm going to use the gc specific mishimoto products and see how that goes.. I am tryin to fit a killer b header in there so.. Well see how much room I have... If I can fit a thicker radiator, I'll go with the GD koyo..
But this might be 5 months before my car is running.
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Old 04-09-2012, 01:40 AM   #14
krylon
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On my DD swapped GC. I have PWR radiator w/ MISHIMOTO slim shroud and FLUIDYNE ultra thin push/pull fans. I ran the MISHIMOTO thin fan shroud w/ fan set for years... No problems. They were a bit louder, but cooled quick. I was surprised the mishimoto fans lasted at all.. I feel their products are sub par.

Chances of keeping oem overflow tank, is slim. You may need to source a replacement.
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Old 05-09-2012, 11:43 PM   #15
weirdpuffy
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Quote:
Originally Posted by Drewbie View Post
I ordered up the mishimoto radiator and fan shroud specific to the gc.. I also have a STi Koyo that's Layin around. I'm going to use the gc specific mishimoto products and see how that goes.. I am tryin to fit a killer b header in there so.. Well see how much room I have....

ANY updates?
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Old 05-10-2012, 12:03 AM   #16
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^ This

Has anyone had issues fitting aftermarket el headers with the koyo r2218 and ebay slim fans?
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Old 05-20-2012, 08:54 PM   #17
Team Scream
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<Edited for truth> Thanks Eby !!!

Last edited by Team Scream; 05-20-2012 at 11:09 PM.
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Old 05-20-2012, 09:24 PM   #18
AKGC8
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His fuel lines are right. I'll update to your other thread about the lines.
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Old 05-21-2012, 02:40 PM   #19
Team Scream
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Default

So can anyone tell me how to (temporarily) use the stock non turbo L radiator, with the manifold reservoir?

In other words, what do I do with the 2 rubber lines that come off of the reservoir?

Normally those would go to the radiator and the overflow tank.

Should I just tee them all together and run them over to the overflow tank?
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Old 05-21-2012, 03:11 PM   #20
mcwc
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From what I've found out while researching for rads...

On the reservoir tank, the nipple by the cap will go to your overflow tank. The other nipple will go to the overflow nipple of the rad. You'll have to cut the spring on your rad cap so coolant can flow into the rad.
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Old 05-22-2012, 11:55 AM   #21
207STi
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I remember dealing with this exact same issue when doing my swap in my L. I will post pictures of how I ran the lines when the car gets back from paint this week. I can't remember off the tip of my head for some reason.
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Old 08-07-2012, 03:17 PM   #22
mcwc
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Default

Just to update the thread, here is my new radiator & fan set up. I've decided to stick with a GD radiator so I can keep AC and have the nipple for the turbo coolant reservoir tank hose. There's about 1.5cm of clearance between the fan and the crank pulley.

Here are the items that I've used:
1 ea - Mishimoto WRX STI aluminum radiator
2 ea - Mishimoto 12" slim fans (removed fan motor spacer)
2 ea - Mishimoto fan mounting kits
1 ea - Subaru OEM upper radiator hose
1 ea - Subaru OEM lower radiator hose
1 ea - Random bottle for temporary overflow
1 ea - Aluminum flat bar, 1" wide

Pictures:




A couple notes:
1. Don't bother getting the Mishimoto radiator shroud. My buddy is using one in his Forester swap and he only has a few millimeters of clearance between the fan and the crank pulley.
2. Both hoses have been trimmed about 1cm to 1.5cm.
3. IMO, don't bother with silicone hoses. I've had issues with them seeping coolant. For my buddy's Forester swap, we ran into clearance issues.
4. Remember to use zip ties hold back your upper radiator hose from the alternator pulley unless you want it to rupture on the highway.

So far, I have no issues with cooling and I've even taken the car for a 831km road trip into the interior of British Columbia.
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Old 08-15-2013, 08:14 PM   #23
WelDun1
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Default Tough Decisions

This is what I think I will be running as well. I've heard so many ppl say to stick with the OEM radiator, and most have valid points, but when it comes down to the amount of complaints of OEM plastic end tanks cracking/leaking vs the lack of complaints of ppl that are running good quality aluminum aftermarket Rad's such as Mishimoto or Koyo, I think I'd rather play the odds of not having to worry about it and spend a few extra bucks, rather than save money and wonder if it's going to last.

Being that its been almost exactly a year since installing the Mishimoto Setup, what's the Annual verdict?
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Old 08-16-2013, 02:35 AM   #24
mcwc
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Default

So far, the set up has worked well in city and highway driving. No leaks & no overheating in daily use.

Though, doing a driving trip in the interior of BC this year, doing an hill climb up a mountain, my water and oil temps rose. On the RS water temp gauge, the needle was at the 11 o'clock mark, near overheating and it happened 1/3 up the mountain section of the highway. I turned on my A/C to use the second fan and the needle held steady at 11 o'clock. By the time I had a chance to pull over, the temps started to go down.

Something similar happened last year on the same highway but going the opposite direction. I only noticed the oil temp but I didn't look at the water temp, thinking it was just the hill climb and the outside temperature affecting the oil temp.

My buddy is his SF Forester with a EJ207 swap with the same Mishimoto GD radiator and the Mishimoto fan shroud has no overheating problems going up the same mountain section.

From what I've read, it could be a faulty Mishimoto radiator cap that can't hold the specified pressure. I'm going to dig up my old STI rad cap and use it on the Mishimoto rad. If I don't have the same problem next year on the same driving trip, then it's a faulty cap. Lots of people say that there's a chance you'll get a bad rad cap.

If I had a chance to do this all over again, I would have spent the time to research into some nice American made slim fans but the Mishimoto ones do the job.
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Old 08-22-2013, 12:46 AM   #25
WelDun1
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Quote:
Originally Posted by mcwc View Post
So far, the set up has worked well in city and highway driving. No leaks & no overheating in daily use.

Though, doing a driving trip in the interior of BC this year, doing an hill climb up a mountain, my water and oil temps rose. On the RS water temp gauge, the needle was at the 11 o'clock mark, near overheating and it happened 1/3 up the mountain section of the highway. I turned on my A/C to use the second fan and the needle held steady at 11 o'clock. By the time I had a chance to pull over, the temps started to go down.

Something similar happened last year on the same highway but going the opposite direction. I only noticed the oil temp but I didn't look at the water temp, thinking it was just the hill climb and the outside temperature affecting the oil temp.

My buddy is his SF Forester with a EJ207 swap with the same Mishimoto GD radiator and the Mishimoto fan shroud has no overheating problems going up the same mountain section.

From what I've read, it could be a faulty Mishimoto radiator cap that can't hold the specified pressure. I'm going to dig up my old STI rad cap and use it on the Mishimoto rad. If I don't have the same problem next year on the same driving trip, then it's a faulty cap. Lots of people say that there's a chance you'll get a bad rad cap.

If I had a chance to do this all over again, I would have spent the time to research into some nice American made slim fans but the Mishimoto ones do the job.
So, basically, ur saying that the Radiator itself is good, and that it could be something as simple as swapping out the Rad Cap? And the Mishimoto fans may not be doing their job...
That makes me think about this even harder now. I might just go with the Koyo VH Radiator with Mishimoto Fans, or like you said, maybe find a good set of home grown fans. I definitely need as much room as possible down there for my FMIC, but I'm hoping that a good Zero Sport T-Stat and the Koyo VH w/ Mishimoto Slim Shroud will do the job. I also thought about just leaving all the stock parts in, and see how it handles my build before I blow a bunch of loot that could be put elsewhere.
Thanx for the feedback,
Weldon
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