Mishimoto sucks poor design for MAZDA RX-8 MT It doesn't fit a lot of design mistakes. the screw hols doesn't match with OEM. the OEM brackets does not fit also if you try to make them fit you will damage the radiator.

 

FYI there is a new koyo for s2 owners. the HH series.

Posted From RX8Club.com Android App

 

Bawmp.


Testing out a new option that isn't very widely available. After I get it into the car to verify proper fitment I'll post more about it.

It's probably a little more oriented towards track only applications with no A/C condenser because the core is twice the thickness of stock, but it still has the condenser mounting points on the front so I guess we'll see.

Crappy cell phone teaser:

 

I'm tempted to get the new Koyo HH for the S2's (48mm core), but being that I DD and autocross, the oem radiator probably fares me well.

 

Probably right unless you live in a harsh climate.

The one I posted above seems to have a 52mm core from just looking at it with a tape measure quick.

 

Don't be shy, post up who the manufacturer is

 

It's actually a company that you wrote off earlier in this thread lol. CSF has a racing division that does all aluminum radiators, they're better known for their OE replacements though.

I believe this one is similar to the one that Stillen used to sell but the core has been updated to their latest version.

 

I didn't write them off, their OE replacement plastic end tank radiator was mentioned and I posted that it wasn't worth mentioning because we all know the plastic ones don't hold up over time

I personally don't care for any radiator that isn't a dual pass design, especially for a track application like yours.

 

I have been looking at some more affordable options
CXRacing 1.57in thick duel core
godspeed 1.53in thick duel core
SpeedDaddy 1.75 thick duel core

all are less then 200$

I have searched the fourms and haven't found any info about these, but it seems the speed daddy is the best seller on ebay

 

I purchased the speed daddy. So far it looks just like the mizu pictures 9krpm posted. Just less "finished"
So far fan bolts up perfect will report more.
I have found folks with 350, turbo miata, 3000gt and mustang running the brand just fine

 

Looks like I will be following In your steps my friend...

 

Just because it worked on a mustang or a 3000gt doesn't mean it will work for a 8 you can run a mustang and a 3000gt at 230 degrease F with out major engine failure the 8 you can't. If it wasn't designed for the 8 with the 8 in mind and not just mass production across the board don't use it especially when dealing with the cooling system. Better to fork over $600 for a radiator for the 8 than $200 for a radiator to fit all cars now and $3000 to $5000 for a new engine later.

 

This from an obx header owner?
That's a crap header if you don't spend 100000000000 for any part its gonna blow the engine

 

I've ran over 230F more times than I can count on track and never had a major failure... engine was torn down for rebuild for more power at 104k miles.

That being said I wouldn't want an eBay Chinese radiator either.

 

Acra, How are you liking that CSF radiator. I really like it. It is over cooling on the street lately, but temps have been anywhere from 35-70 when I've driven it this winter. I had to tape it up a bit.

 

That's good to hear. Overcooling shouldn't be a problem if the stock thermostat is in.

My car still isn't running lol. You can see progress in my build thread, link in my signature.

I'm excited to try it though, it looks awesome sitting in my room lol. One of the biggest radiators you can buy and it's under 400 bucks. Even the 600 dollar offerings are stock core thickness.

 

Yes my OBX if holding quite well and that buy was be for I realy started reading all the data on the forums but as it is holding well with no wield failures I think I'll keep it. As for running over the 220 mark I just was making a statement it is possible not definitely going to happen as soon as you hit the mark to get engine failure. Where a V8 can sustain such temps with out much worry. As for you running 230 on the track I have seen some of your posts your not running a sock engine unless my assumption is wrong in wich case all the data indicates your a lucky person. Personally I don't want to test this 220 230 temp with my engine so I'll spend the extra cash be for summer hit for a cooling system that is advised as this is the next thing I need to do be for any more power mods.

Btw if this cheaper raid proves to be good and all wields hold at track stress I would love to see any and all data on this.

 

A radiator has one job. If overheating were to occur it wouldn't be from a "cheap" radiator. There would be some other issue your not addreasing.

 

Welp looks like I need a radiator. Just noticed a hairline crack in my OEM one and been losing coolant. Any suggestions for aluminum ones. It seems the Mizu fits. Any word on if Mishimoto updated their design.

Also anyone have any success with the eBay ones? I have a Godspeed radiator laying around the garage that I got dirt cheap from a buddy. I was told it has fitment issues. Should I try installing it or nah??

 

Just get a good aluminum (CSF, Mazmart, Griffin) or don't bother and get a plastic OEM one (Calsonic, Koyo). The cheap ones are not worth the fitment headaches. The MIzu is not available anymore. We just installed cheapy aluminum for a local guy and it fit like ***, had to make brackets, etc.

The issue with these cheap ones is the top bolt holes on the top front of the radiator. They fab them straight up and down on the face of the top on these cheap ones and they need to be at 45 degree angle like on the OEM rad.

 

Okay notice how on these radiators the bracket that hold the front are angled?



Now look at this shitty one and how the brackets are 90 degrees.

 

Ahh gotcha. Is that the main big fitment issue with the cheaper aluminum radiators? I've seen a thread on here about the mishimoto radiators and how the stock fan shrouds wouldn't line up with the holes on the mishimoto on the rear. I wouldn't mind going with a stock plastic radiator again if there's isn't a huge difference in running temps. But I like the aluminum for the durability over the plastic end tanks that can crack and break off.

 

Yeah there has been some issues with the fan shroud mounts as well from what I have heardbut I have installed a few brands over the years and the fan shroud fitment issues have been easily fixed on the cheapy ones but the good ones typically have no fitment issues in that regard either. You can see my build thread for the Flex-a-lite fan shroud upgrade I did.

https://www.rx8club.com/series-i-maj...thread-214417/

 

So I just put in my order for the CSF aluminum radiator. They guarantee drop in fitment with no modification necessary, so atleast I have that.
Heres the link to the radiator I ordered:

CSF Radiator Mazda RX8 [Aluminum] (2004-2008) 3164

Much better price than Mishimoto, I was most worried about fitment and I've read horror stories from Mishimoto customers so I avoided. I have a scangauge II hooked up so I always monitor temps and I'll be comparing them after the install to see if I get a difference in performance from this radiator.

I'll try to take some pics and document the install since I didn't find much about this radiator online. I did see Stillen still has them in stock on their website also. Same part number and all. But I ordered from here because Stillen didn't take Paypal

 

CSF makes good stuff.