When this happened to me, I had to just bite the bullet and get the mishimoto radiator. Now my Z runs slightly on the cooler side and it’s amazing.
Denso and other OEM for me. When insurance wanted to throw Napa parts at my radiator replacement destroyed by a napping squirrel in the fan assy, I ponied up the difference to go with the Denso and mechanic confirmed it was a solid choice.
Aisin water pump, Mitsuboshi or Bando belts, and replace the radiator as a preventative measure with a Denso unit.
Mishimoto radiator, all under trays intact, vented carbon hood, dual rotary performance oil cooler thermostats, and mazdaspeed front bumper. She stayed a steady 205.
I replaced mine at 129k miles due to a small leak in the bottom of the radiator. I purchased an OEM Denso one on Amazon for 220 and it's been working great, no issues with trans temp as well.
I usually Autox and track my rx8. My last event it was 90 outside and after fueling and a run my temp was only 205. I do have an aluminum misimoto radiator
Replaced it with that exact same Mishimoto rad and have had zero issues with the fitment or durability for 10+ years and 60k miles later. I believe I saved ~$600 or so by not pursuing OEM replacement.
Mishimoto is okay but it's fucking massive and requires more disassembly of the front end of the car to stuff it in there.
The MVP radiator and the Denso aftermarket are identical, both say Denso. The main difference between the OEM and the MVP/Denso is the OEM is 2 Core with a radiator thickness of 1.075 inches thick. The Denso is 1 Core with a radiator thickness of 0.663 inches thick. I measured the thickness using a digital caliper. Another difference is the transmission connection lines, the MVP/Denso looks like a cheaper aluminum, and the OEM is a heftier non aluminum metal. As a side note, after searching the internet and YouTube, some people have leaks at the radiator line after a couple of years with the Denso aftermarket ones. Next time I will be sticking with the OEM model, I just don’t have time to return the Denso and order another OEM one.
Recently got rid of the mishimoto radiator and went back to the updated larger radiator
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