Hey guys. I am currently working on an rx7 I just recently purchased. It runs great but with in the next year I plan in switching it over to a turbo2 motor because right I have an N/A. So I am going in steps. I fixed all the exterior and
Interior and I am on cooling. The question I want to do a dual oil cooler set up. So what is the best and reasonable priced oil coolers in the after market world. Also what is the best imagination point for them? Thanks for the help!

 

Sorry ment to say installation point.

 

why run duals?

you can just run two stock ones.

 

I would run dual just for the added coiling since they do run so hot. Where would you mount the 2nd oil cooler. Wouldn't after market ones cool on a better scale?

 

They don't run that hot. Our stock oil coolers are freaking massive, if you are looking to have a modestly modified turbo2 I would spend the money on other upgrades.... turbo... injectors... intercooler.... radiator.... anything other than a ridiculously expensive and marginally needed dual oil cooler system. If you aren't running like 450+ HP, you dont need it. If for some reason you deem it necessary to have then listen to Cygnus. Just mount another stick one in parallel with the other right below it.

 

So basically just keep the stock cool and not worry about it. Or go for one good after market 1?

 

how does it compare to an fd one?

 

The stock oil cooler is really good. Just check to see if the hose looks OK, and you can buy a new one from Mazdatrix if needed. If you plan on racing in NASA track events in very hot regions then you may want to upgrade to a racing cooler, but otherwise I would stick with the stock unit. Dual coolers can create oil pressure problems if you don't know what you are doing, so I would not recommend that unless you have a professional race shop design the system.
http://www.iscracing.net/2nd_gen_rx7.html

The crummy part of the cooling system that you will want to replace is the stock radiator with its brittle plastic end tanks. I recommend something with all-aluminum construction. The Koyo replacement radiator (30% better than stock) is good for stock or mildly-modified cars (it uses the stock radiator mounting rails, so don't throw them away!). For high-power applications an AWR/Ron Davis, or custom Griffin radiator would make a good choice. Just keep in mind that most racing radiators are too thick to use with the stock fan shroud, and would therefore require a custom or Corksport shroud or an aftermarket electric fan.
http://www.rx7store.net/Koyo_Radiato...w_p/r1144n.htm
http://store.awrracing.com/categorie...1986%252d1992/

Ducting is very important, so install custom ducting if you remove any of the factory ducting or floor plate. Heat exchangers work best with a divergent duct that has an opening that is about 1/4 the area of the heat exchanger core, or maybe a little larger for a low-speed application such as a drift car.

 

FD oil coolers suck. Like most of the rest of the cooling system, Mazda downgraded it from the FC to the FD. It relies on extensive ducting. Base model FDs had only a single cooler that was much smaller than the 2nd gen cooler. R1 models and other upmarket FDs had dual coolers which still weren't great.

 

The stock FC oil cooler is one of the best stock oil coolers there is.
Its massive surface area can dissipate heat efficiently.
The Oil system accounts for 1/3 of the cooling temps in a rotary engine, its better to upgrade the radiator then the oil cooler.

People with FDs run duals because the stock cooler is very very small compared to the FC stock cooler. Even then, I dont even think dual coolers on the FD has the same surface area as the single on the FC.

If you go turbo and want a FMIC, be prepared to rework the ducting for proper airflow through the oil cooler and radiator.

 

Thanks for all the info. The final goal of the car is to swap the motor and put a FMIC so i guess i will tackle that when I actually Do it. I am Thinking of doing an single one now but try to find one bigger. I already have the stainless steel break lines so i might just put them on for now.

 

Dude. You don't need a bigger oil cooler. Spend that money on engine management, good tires, interior, suspension, whatever.

 

sheesh.....

there is no difference between your stock non turbo cooler and the TII one.

so what everyone is telling you is...... LEAVE IT ALONE!

 

i have dual oil coolers with AN fittings and hose for sale $550 shipped

 

... or just send me $450. You will save $100, I will gain $450, and your engine will run at the same temperature as it would with the $550 dual oil coolers.

 

or split it up with everyone who has commented in this thread.

greedy sob....

we also have to decide who gets to punch him in the nuts since we also saved him from the headache of additional oil leaks, mounting modifications and ductwork. you can have that honor though!

 

Excellent! I applied for a job with the TSA back when it first started, but they turned me down. Punching him in the nuts would make me feel like I got the TSA job. If one of his nuts explodes I'm gonna send him to Gitmo.

 

^^
hahaha

 

hahaha... Alright Stock cooler it is maybe just flush it out and clean it

 

look at how ginormous this thing is (for an oil cooler anyway)

 

Any more info on this?

 

http://www.ch601.org/resources/cooling_systems1.htm
http://www.ch601.org/resources/cooling_systems2.htm
http://www.ch601.org/resources/cooling_systems3.htm
http://www.ch601.org/resources/cooling_systems4.htm

 

While we're on the topic of oil cooler efficiency, I also have a question about running anything but the stock unit...

..I assume that most aftermarket coolers do not have oil bypass valves (oil thermostats), correct?
Does this have any negative effects besides a prolonged warm-up?

For those who don't know...
Stock valve in a T2 opens at 165*F
Normal operating oil temps range between 160* and 200*

 

I haven't had a thermostat in my oil cooler for over two years with no observable side effects.

 

Has anybody used an electric fan on the stock oil cooler? I am thinking of installing one with a manual switch inside the cabin and turn it on if my oil temps go up. I will put the fan in front of the oil cooler so it will push the air instead of pulling it. If i use the fan as a puller and put it behind the oil cooler i think the factory radiator fan will mess up the electric fan. Anyone tried it before? if yes what where the results? I will use the fan to cool the oil while idling after a hard run too.

I do not have any oil temp problems now but i do not know if i will have any in the future with my front mount IC so i am thinking of doing this just in case..