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.
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 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.
I got the mishi rad and racing thermo in mine for vegas. Love it, no issues thus far after 2 years.
As for highway driving (when the high speed airflow takes over) I saw little to no difference with my OEM vs Mishimoto All-aluminum radiator. Hot day, w/ and w/o AC temps push 220F easily.
I’ve been using the same one on my skyline for nearly 10 years and lately the coolant has been brown. Mishimoto radiators are good enough
I have Mishmoto ( dont recommend) on my 2016 wrx in Arizona at 110 days w the Ac on it runs at 190-197 on the streets. While on the freeway its at 215 avg while cruising at 80mph. Been on my car since 2017 I think. But this was before CSF and whatnot came around. Can’t wait to save up and switch.
Bought it for my coyote swapped F100 and there was a hole in it from the start. Rewelded the whole thing because wasn’t worth the return when I can just do it myself. Welds just looked like someone just started child labor and it was their first day on the job. Wouldn’t buy one again if I had too.
my Mishimoto leaked/falied apx 10-11 years after I bought it. and keep the receipt, or your lifetime warranty will not be valid
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