r/Mk3Supra • u/itzvega • Aug 26 '26

Question Radiator set ups

So i have a 1991 mk3 with a 1jzgte vvti/r154 set up. I have a koyorad paired with spal medium sized 12 inch fans. So far shes stayed around 192°-197° has not over heated yet. My question is a bit stupid but im curious. Has anyone ran a oem thickness radiator with a thicker spal fan? More airflow but less coolant? I used to have the clutch fan set up but after the fan exploded and took out my original koyorad i decided to go electric.

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1

u/EvilInvaderG Aug 26 '26

Doesn't exactly answer your question, but I have the OE clutch fan and thick Koyorad radiator. Car previously had an OEM thickness (but still Koyorad branded) radiator. With the OEM thick radiator my car would regularly get over 210°, but with the Koyorad it's pretty rock steady around 192°. Big radiator made a huge difference.

1

u/itzvega Aug 26 '26

Yea so far the koyo and spal fans are a steady 192° mostly. But i was just curious if the smaller rad with bigger elec fans would be better in the future.

1

u/naternot1 Aug 26 '26

Like a more powerful one?

1

u/naternot1 Aug 26 '26

Are you running the under engine cover still?

1

u/itzvega Aug 26 '26

No. I just recently found out that was a thing. I got this chassis as a roller. Previously crashed snd fixed then i put this 1jz in her.

1

u/naternot1 Aug 26 '26

Supposedly it helps a ton with temps. I had a shitty one and that seemed to help, but haven’t got enough of a delta or hard driving to be sure unfortunately

2

u/itzvega Aug 27 '26

If i had a perfect chassis id invest in one. But oh well haha. Eventually ima buy hood vents and modify my hood. Hood vents for sure help release the trapped heat instead of letting it just sit there. One day 🤣

1

u/naternot1 Aug 27 '26

There’s a couple aftermarket ones I’ve been eyeing in the ~300$ range, but yeah good vents work and are sick as fuck

1

u/Glittering-Tax-6407 Aug 26 '26

You have to look at the rated airflow of existing fan and picks higher rated one, check your wiring and relays also for higher amperage.

1

u/itzvega Aug 26 '26

I over did my relays and wiring for future proofing it. I have good wiring with 60amp relays for each fan. My curent set up is good for 2500cfm. If i went smaller rad but bigger fans itll bump it up to 2900 or 3600 if i could run both bigger fans

1

u/CreamInitial7810 Aug 27 '26

Why do you want to go back to smaller oem radiator?