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Koyo's New S2 Radiator (48mm)
Not sure if anyone has seen/tried this:
Koyorad Racing - News and Updates 09-11 Mazda RX8 radiator is here! Friday, March 15, 2013 Koyorad | Koyo is proud to introduce a performance replacement all aluminum radiator for the 2009-2011 Mazda RX-8 1.3L MT. This brand new application features Koyorad's new 48mm “HH” Series radiator core to maximize heat transfer. Koyo designs and manufactures each radiator with precision; therefore this is a direct-fit performance replacement for the stock OE Plastic / Aluminum radiator and bolts directly to the factory fan shroud for a quick and simple installation. Koyo has also integrated a 1/8” NPT female accessory fitting (supplied with a threaded plug) to accept temperature sensors typically included with aftermarket temperature gauges. Koyorad quality is a direct result of their privately owned factories which allow Koyorad Japan to oversee each stage of radiator production. This ensures that quality is never sacrificed for quantity. Each Koyo all aluminum radiator core is hand assembled, Nocolok brazed, then TIG welded by hand with the finest aluminum available. These are just a few characteristics that have earned Koyorad Radiators their excellent reputation in performance radiators worldwide. Application: 2009-2011 Mazda RX-8 1.3L Koyorad | Koyo Part Number #: HH062267 (04-08 Models, use part# V2695) Contact: info@koyoradracing.com Available: Now Features • Koyorad “HH” Series 48mm Core • OE Specific mounting and direct fit • Mirror polished finish • Nocolok-R Brazing • Precise Tube and Fin alignment • Billet aluminum filler neck • 1/8” NPT female accessory fitting |
PWR makes an S2 radiator, part number PWR6432, it's a 42mm core.
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Very little to no information on that radiator as well.
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Bringing this back from the dead.
Has anyone here tried this radiator? How was the fit? I need to replace my radiator and I'm looking for something that will cool better than the original, since my car has been running warm in the summer here in Texas. Update: I bought one and it fit fine. No problems installing it. |
Did it fix your overheating issues? Worth the money?
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Originally Posted by noredline
(Post 4608675)
Did it fix your overheating issues? Worth the money?
It's hard to say if it helped with the cooling. Before I installed the Koyo radiator, the car would spit coolant out of the overflow on hot days. When I installed the new radiator, I saw that the fins on the oil coolers were all bent, so I straightened them. Since then, I haven't noticed any coolant coming out of the overflow. The coolant still hits 210-215 degrees in rush hour traffic. So, I can't say how much the radiator helped, but it didn't make things worse at least. |
It doesn't matter how big or efficient the radiator is in low speed/idle conditions, the fan operation and thermostat set points determine that temp
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Is there larger/more efficient fans arounds for series 2?
Originally Posted by TeamRX8
(Post 4615607)
It doesn't matter how big or efficient the radiator is in low speed/idle conditions, the fan operation and thermostat set points determine that temp
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the fans on S2 are better.
but it's really an overall better cooling system. not just fan/shroud |
Originally Posted by paimon.soror
(Post 4461404)
Larger than the stock 36mm RX8 S2 radiators.
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Originally Posted by TeamRX8
(Post 4676583)
bump, looking for info/confirmation on the core change of the S2 radiator and this was the only thing I've found. The actual core thickness on the S1 is 25mm. The header tanks are about 1/2" wider, so looking to confirm the actual core width, length, and thickness on the S2 ...
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Ash also confirmed the small volume change so it is likely very close to the same size. Thanks.
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Mark,
As I said to you in PM I have a brand new OEM S2 MT Radiator here, but it is well packed and boxed away in storage, I can get it out with some frustration if you really want profile measurements. :squint: Here is a pic of a damaged one (I no longer possess), sorry no profile (side on ) pics. https://cimg5.ibsrv.net/gimg/www.rx8...f941d15fac.jpg |
Thanks, but I just decided that it's not worth paying $100 more for it than an S1 radiator
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Hey guys. I just bought one of these for my S2. I'll try to remember to take measurements/pics.
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I just measured my 2010 at 36mm. This is the number on koyo's site for the stock replacement as well.
Eyeballing the koyo racing rad (above) it appears to be the quoted 48mm. Hope it fits! EDIT: Pic of rx8 s2 (2010 sport manual) oem radiator: https://cimg9.ibsrv.net/gimg/www.rx8...3c7ded1ad8.jpg |
Hmm, I actually forgot to order the S1 yesterday. It doesn't seem to have changed the volume much. Want to sell your used OE S2 radiator? The Koyo fits fine (see post# 4).
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Originally Posted by TeamRX8
(Post 4680598)
Hmm, I actually forgot to order the S1 yesterday. It doesn't seem to have changed the volume much. Want to sell your used OE S2 radiator? The Koyo fits fine (see post# 4).
. EDIT: perhaps qtipconnoisseur can sell you his |
no problem, I ordered an OEM replacement S2 manual trans radiator from Rock Auto today instead today. It was quite a bit less than my discounted S1 radiator from Mazda.
Since I'm not planning to use the OE fan/shroud I'm thinking (hoping/praying?) it won't have a fitment problem in my S1 ... |
S2 OE replacement vs OE S1 radiator below. I only see three differences
1. S1 radiator is 27mm thick, S2 is 36mm thick 2. Lower mount posts have an extra extension length on them. Not sure if this on the factory radiator or not, but they would protrude below the car on my S1 so I'll just trim them off. Doesn't affect anything. EDIT: no issue at all, use as-is without modification. 3. The RH upper bolt-on point for the fan shroud housing was moved out from near the radiator inlet neck to the outer corner just like on the LH side. Not sure why the S1 had this shroud mounting point located away from the corner. Makes more sense where it is on the S2. I think you could make a metal bracket to extend over and use the S1 fan housing if putting this radiator in an S1 chassis. I won't be using the OE fan/shroud assembly so no impact on me. Still can't get over how light this radiator is for the size ... https://cimg8.ibsrv.net/gimg/www.rx8...45d9de014b.jpg S2 on the LH side, S1 on the RH side . |
Originally Posted by TeamRX8
(Post 4683238)
S2 OE replacement vs OE S1 radiator below. I only see three differences
1. S1 radiator is 27mm thick, S2 is 36mm thick |
Originally Posted by TeamRX8
(Post 4683238)
S2 OE replacement vs OE S1 radiator below. I only see three differences
1. S1 radiator is 27mm thick, S2 is 36mm thick 2. Lower mount posts have an extra extension length on them. Not sure if this on the factory radiator or not (yes confirmed), but they would protrude below the car on my S1 so I'll just trim them off. Doesn't affect anything. Ah see my pic above and genuine OE N3R1-15-200B S2 6MT Radiator and longer bottom pins....;) 3. The RH upper bolt-on point for the fan shroud housing was moved out from near the radiator inlet neck to the outer corner just like on the LH side. Not sure why the S1 had this shroud mounting point located away from the corner. Makes more sense where it is on the S2. I think you could make a metal bracket to extend over and use the S1 fan housing if putting this radiator in an S1 chassis. I won't be using the OE fan/shroud assembly so no impact on me. Still can't get over how light this radiator is for the size ...Yeah agree, I cant understand Mazda how they would engineer such a light core, like the FD had the thicker unit. You ought to see the NC Radiator I have, no thicker than 20-25 mm! https://cimg8.ibsrv.net/gimg/www.rx8...45d9de014b.jpg S2 on the LH side, S1 on the RH side . Just in case you forgot your spectacle's.......... ;) BTW: Thanks for side profile pic. https://cimg9.ibsrv.net/gimg/www.rx8...24a2ee3b82.jpg |
well this old fart was up all night under an RX8, so I didn't think to go back and look at that pic :)
Didn't come with any foam strips either (you can see where I pulled them off the S1 radiator, the self-adhesive tape lines), but I don't need those |
Originally Posted by TeamRX8
(Post 4683390)
well this old fart was up all night under an RX8, so I didn't think to go back and look at that pic :)
Didn't come with any foam strips either (you can see where I pulled them off the S1 radiator, the self-adhesive tape lines), but I don't need those Pay attention next time you old dog.:wink2: |
Looks like I will be the next guinea pig trying this radiator. I discovered a pin hole leak on the bottom of mine yesterday. TH Motorsports has it for $314 with free shipping, so I guess that is what I will be doing.
I'll report back as to whether I see any improvement in a few weeks. Not expecting miracles. |
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