Koyo N Flow Vs Regular Koyo

[SR-S14Slidin]

Is there any real big differance? My car seems to run just a tad warm during the day driving around town and starts to get pretty close to boiling over when i hit freeway speeds.Currently Im running a stock radiator and Im about to order a koyo but not sure if its worth spending the extra $.

[undesiredshoe]

No radiator is going to fix that problem, there is something else wrong. Probably water pump, thermostat, or improperly bled system.

[240sx123$]

No radiator is going to fix that problem, there is something else wrong. Probably water pump, thermostat, or improperly bled system.

x2.

Start with bleeding the system, then replace thermostat with a nismo.

[jspaeth]

No radiator is going to fix that problem, there is something else wrong. Probably water pump, thermostat, or improperly bled system.


This is correct.

For all but HARD track driving, a stock radiator is MORE than enough.

I went from stock KA to Koyo Radiator (N flow....because my stock one got a leak) and the coolant temperature is identical (measured via PowerFC).


The reasoning behind this is that essentially, the thermostat controls the temperature under MOST normal circumstances.

If you are truly beating on it nonstop, like road racing or drifting maybe, then the thermostat reaches the point where it is flowing as much water as possible, and even then, MAYBE then the radiator can't release enough heat....THEN you need a bigger, better radiator.


But for daily driving and getting a few pulls in here or there (or drag racing), there is literally no need for anything more than a stock radiator and stock thermostat.

[SR-S14Slidin]

Well at this point I have no idea what else it is cause thermostat was replaced, System is bled, I have samco hoses and im not leaking any coolant, Water Pump as far as I can tell is working correctly although I haven't replaced it. Only reason I have considered replacing it is cause my stock radiator seems abnormally thin its about as thick as my razor phone(yea hella broke ass phone) Only other thing I could think of is maybe temp sensor but idk.

[SR-S14Slidin]

So does anyone wanna actually answer my question though????

[310R]

I like my koyo,it keeps the temp more consistent and if you are running more boost it is a plus.

[S14DB]

This has been covered IIRC http://zilvia.net/f/tech-talk/309259-difference-koyo-radiators.html

[Jbma327]

I personally think the quality of Koyo radiators are junk nowadays. Koyo in the past were made in Japan. Today they are made anywhere that is cheapest.

Many Koyo Radiators that I seen nowadays have started leaking within a couple of years. Currently we have 5 aluminum koyo radiators sitting at the shop that we took out of customers cars due to leaks. 2 of them looks piratically new and have less that 2 year on them have leaks through the fins, the other 3 has no more than 3 years on them.

What I am trying to say is that koyo rad nowdays sucks and I would personally recommend getting some other brand. Pay a little more and you will have a much longer lasting radiator that will perform just as well if not better.