Ever have a chance to document the hints and tips? Thanks!

 

Aside from fitment, I think people really need to consider the additional stress introduced to the water pump with multiple pass radiators. There's a bunch of articles that state the same thing but I'll quote part of one:
"This also presents an increased load to the water pump, which means using a dual-pass radiator demands a better water pump if the system is to take advantage of the dual-pass concept." which was taken from here: http://www.carcraft.com/howto/ccrp_0...em/basics.html

Also, the Koyo N-Flo radiator is a triple pass (hence the name "N-Flo" since the flow of the coolant follows the shape of an "N") which increases the load on the water pump even more than a dual pass! Our cars already have a poorly designed water pump, PLUS the water pump pulley tends to slip already if you eliminated the air pump, so I personally would choose to stay away from the "N-Flo".

One more thing. For street cars, there's another drawback for multiple pass radiators. Another quote: "Dual-pass radiators work efficiently at high speeds in certain race-prepped systems, but do so at a cost of increased load on an engine's water pump, and inefficient low-speed cooling capacity, which can raise pressure and temperature to higher-than-desired levels", taken from here: http://www.importtuner.com/tech/impp...sis/index.html. Street driven FD's can see a lot of low speed situations so IMHO, it's better to have a single pass radiator for the street.

 

I personally used single pass koyo , its a POS in my opinion , now I use a N flow and it absolutely phenominal ! but I also use an electric Mizerie water pump.

 

Additional stress on water pump with N-flo was one of the reasons why I went with a regular Koyo. Another thing is if it ain't broke don't fix it meaning if a regular radiator does the job no need to invest in technology you don't need. Afaik all oems are single pass even for high performance and exotic cars. A healthy running cooling system is more important then N-flo.

Dual pass or triple pass depends on what you think the water is passing, yes it passes through 3 areas of the radiator but only passes through 2 seperators/gates/doors. Koyo says it's a dual pass

What do you mean by POS? What were the differences in temps between regular and n-flo. You're talking day and night difference, I find that hard to believe (water pumps and rest of the cooling system being the same).

 

Yeah, I noticed Koyo calls their N-Flow a dual pass radiator, and I am in no way saying that you're wrong or anything like that, I think Koyo is wrong for calling it a dual pass. In MY mind, I still feel that it is a triple pass. Here's my train of thought -
Single pass goes from top end tank > bottom end tank.
Dual pass goes from top end tank > bottom end tank > top end tank.
Triple pass should logically then go from top end tank > bottom end tank > top end tank > bottom end tank, which is what the N-Flow does. If Koyo calls the N-Flow a dual pass, how do you differentiate between the design of a traditional dual pass and Koyo's idea of a dual pass when there clearly is a difference?

Also, with a traditional dual pass, when coolant reaches the radiator, coolant is forced to flow at a rate that is 100% higher compared to a single pass radiator of the same overall size (because it needs to travel twice the distance through half the number of rows).
In the case of the Koyo N-Flow, when coolant reaches the radiator, coolant is forced to flow at a rate that is 200% higher compared to a single pass radiator of the same overall size. (Because it needs to travel 3 times the distance through 1/3 the amount of rows) This is another clear difference between a traditional dual pass radiator and Koyo's N-Flow, which is why I tend to think of the Koyo N-Flow as a triple pass radiator.

 

I am having a hard time fitting my M2 Large SMIC with my Koyo radiator. The IC ducting is being pressed upward by the thicker radiator. I will see if the issue is the lower brackets but I may have to do some cutting of the fan braces or ducting. Interesting the radiator seems to fit with some cars but not others.

 

This has been helpful... thanx for posting all the needed Info.

 

I know this is a really old post but still for someone new, looking into understanding a bit better what his cooling options are, this is still very helpful.

Thanks,
Kostas.

 

Here is the thread I created with installation tips https://www.rx7club.com/3rd-generati...-tips-1107155/