stock radiator
 

anyone have any luck with the stock replacement radiator from mazdatrix? or know of a place to get one?

i am looking for a thin radiator that i can use instead of the koyo so i can put the stock airbox and everything in and have it fit nicely...

I bought a drop in replacement stock size alum rad from radiatorworld. I think it was like $160 or something can't remember. Works just fine for my backroad/mountain runs and daily driving. Don't think I've seen over 91 but I'm using datalogit to turn fans on earlier.

wonder how long till this turns into a Fluidyne vs Koyo blood bath :)

I am running stock airbox, stock intercooler, ducting, etc. with a Koyo n-flow. If you want it to fit easier, there are other larger than stock radiators you can buy. Mazdaspeed/Ron Davis is supposed to fit easily. See this thread...

https://www.rx7club.com/showthread.p...t=radiators+fd

I would recommend a Fluidyne:

http://www.rx7store.net/product_p/fluidynefd.htm

It's a little larger than stock, but not so large that you need to worry about any fitment issues.

I would also recommend a fluidyne, getting the koyo to fit was a big pain if you've never done it before.

Same here, I installed my N-FLO last week, only thing that didn't fit afterwards is the cover that goes over the relay box and the stock IC duct, so I just left that out.

Everything can fit, I can promise you that. It takes time and some messing with the brackets, also a little work to make sure it sits as low as possible at the lower brackets.

If you remove the stupid rubber mounting boshings, it will allow you to drop the radiator down at least half an inch for more clearance. That is usually enough. If you need more room you can fab up some basic brackets.

Mine is gone, I actually bolted the bracket down from the bottom instead of the top, metal to metal with no spacer, that let me push the radiator down as low as possible. One question tho, without the rubber spacer, will vibration cause stress on the radiator and maybe crack the welds?

It's a bad idea to go without the rubber mounts. If it's been installed metal to metal, radiator touching frame that could cause a number of problems. Mazda put them in for a reason and no installation I've seen has required or recommended that they be removed.

Are we talking about the rubber by the upper bracket or the rubber seats at the bottom? I have the rubber seats at the bottom, the 1/2" thick rubber spacer on the upper bracket is the one I'm talking about. I had to take them out for the Koyo to fit, otherwise they'll push the radiator up half an inch making the airbox and IC sits too high.

You should be able to keep both the top rubber "lord" mounts and bottom rubber feet the slip onto the pegs and rest in the bracket. If you remove those metal tabs on the lower radiator brackets you can get it to sit further into the brackets. The koyo is so much thicker that it comes in contact with the tab. DO some searching on the koyo install. I had to remove some material from the e. fans frame as well. I'm sure you flipped the brackets but that also helps if you did not.

I pretty much look through all the Koyo related thread before and during my install.

Both rubber feet are all the way in at the bottom, I bent the tab a bit so the radiator can sit all the way in. As far as the bracket, I only have 1, don't know what the previous owner did to the other bracket. And I have no way to verify if I flipped them or not, for all I know the previous guy could've flipped them already and I'm just flipping them back to the original spot.

The RADIATORWORLD stock replacement is perfect. Slightly larger than stock yet fits exceptionally well....just like the OEM stock unit.

keep the koyo radiator, I got everything to fit nicely although it was a tight fit.

Do it once, do it right, you'll never regret it.

I know what you mean about flipping the brackets. I forgot which way was stock and had to do a few test fits to get it right. It is difficult and not fun in my opinion. However when it's all done and the engine bay fits back stock and clean, it is worth it. I removed a good 1/4" to 1/2" on the high spots of the fan frame. I would find another rubber mount and make it all work. You can also drill some new holds in addition to flipping the tabs. The combined effect of every possible solution made it work for me. I did retain the stock lord mounts though and I think that is important. Mazda put them there for a reason.

You do NOT need the upper rubber mounts if you have a solid bolted together mount. The only issue would be if the radiator was loosely mounted and vibration caused the radiator to rub against something. The stock rqadiator has steel mounting brackets so it would not be too much of an issue, but the aftermarket asluminum ones would rub through if they were mounted loosely against the steel frame. On the bottom however, you need the rubber bushings so the mounts do not rub through the radiator. While I can understand why some people may think things are there for a reason, Mazda did a lot of unecessary things in some areas, and fell short in others. I mount nearly all aftermarket radiators this way and have never had an issue. The main thing is to make sure they don't flop around.

^ The radiator is very solid, not touching anything, and is as low as it would go.

Thanks Adam, I'll take a look at it again next weekend, see if I can get the lord mounts to fit.

If you're not going to use the rubber lord mounts, I would find some rubber washers or cut a little pad out of rubber to isolate the radiator and frame.

Ron Davis
 

I Have a Ron Davis radiator and it fits perfectly.

If I had to do it all over again I would get the Ron Davis. I spend about $150 less on the Koyo but it was such a pain to install and get all the stock pieces to fit.

That's what I'm planning to do, I doubt I can get that 1/2" lord mount in there, but I might be able to get a 1/4" rubber washer in, we'll see.

i bought one from ebay and fit perfect.
just watch this picture
https://img26.imageshack.us/img26/2136/img0583sy.jpg
https://img830.imageshack.us/img830/8939/img0637d.jpg
https://img16.imageshack.us/img16/4417/img0651w.jpg
all rubber stay in original place for better "suspension"

Did you drill another hole on the radiator mount? I see 2 bolts there instead of 1.

yes youre right. on one hole it has tendency to rotate, so for better attachment... 2hole.