Japanese Rx8 tuning shop Odula have the kit like that
Because in Japan Sec oil cooler is option
So a lot of car don't come with it

 

Machine spec
05 S1 sport with mazda remain
Exterior Re amemiya Front spoiler and vent hood
Cooling mod
RX8 Performance radiator, cnc blade water pump, low temp thermo
Stock airbox and stock location battery

Weather
29C with semi wet track

The car can handel 2-3 lap of full on driving
With coolant temperature no more then 95c if keep rev to 8000, once shift behind that the coolant temperature quick climb up to 100c and will take while of below 5000rpm cool down lap to lower it!!

 

100C water temperatures are perfectly safe. Over 105C and you should start slowing down.

If you notice coolant temperatures keep climbing at high speeds, you need to make sure the radiator is sealed on top, left, and bottom. Not doing so will allow air to bypass the radiator and not cool the engine.

 

On my Rx7 I was able to keep it below 90
My home course toward rear section is low speed so at that part of track the temp will climb

 

Did you fill the gap between the top, left side, and bottom of the radiator after you installed the new one?

Also, this isn't an RX-7.

 

Watch out for that ditch ...

 

Just going to say that if you buy this radiator and then block it off in both the front and rear will all the OE crap as the last guy above did you’re just shooting yourself in the foot. Blocking off everything with foam to force more air through is also treating the symptom rather than curing the real problem. Your engine bay is going to hot enough to out-sear Ruth Chris’ steakhouse.

 

Final touch for my track Coolant system
Relocate battery to trunk
Was such nice sign to see all the hot air is escape thought my Amemiya Vent hood !!!

 

Good choice. Getting rid of that airbox will be even more of a help

 

Thanks~ so glad to see coolant under control
I personally think this is cooling mode I should done first !!!!!
Next week , I will test at track, to see if I can keep coolant under control 100c for 3lap
Then I think I will add Ram air scoop to see if the performance gain on that , affect coolant temp

 

I had no illusion that you’d heed my advice

 

Unfortunately, the radiator lasted less than 15 000km. The radiator sprung a leak. Cannot see any damage externally

 

The dual-pass design works well, reduced my coolant temps by 8-10 deg; but unfortunately the unit sprung leaks in both end tanks at low miles of service, -4,000 mi.

 

A real test !!
Weather was 90F high with 70% hum

Whole time Coolant temp stay around 98c/208f
When I try to draft from front car , coolant will jump to 102c/208 , and for first time I own Rx8
I can run whole session !!!!!

 

I will be looking for another solution for the radiator if the stock radiator cannot cope when I install the supercharger.

Shame that the radiator died so soon. I am hoping that dual oil coolers will hold up

 

The DP design is so effective...that I’m giving a go at resealing mine, will reinstall it over winter months, and see if it holds up...

 

It’s all aluminum. Any half way decent radiator shop should be able to repair it. It’s a good design otherwise and stuff happens like this with hand fabrication. It can look and test fine when built, but vibration, heat & pressure cycling stress, etc will show itself eventually at a weak point like where maybe it wasn’t fit up or fully welded quite right. It would make a whole lot more sense to fix and keep using it if at all possible.

Afterall, if you had that same attitude about the SC kit it would have been gone a long time ago. That might have made the more sense just joking, sort of ...
.

 

 

With Obd reader read 100-101c
The temperature sticker on upper tank
Read some nice cool number~

 

Spot a minor leak today
Take everything apart
Locate leak on radiator upper right
Hide behind mount support

Very bitching .......

 

Pressure up to 13psi
Will loose to 12psi around 15min
Then see this tiny drop of coolant at floor

 

Dual pass develop more leak
Decide to take it off to Be repair
Throw on eBay dual row OEM radiator
Yeah , compare to Dual pass
It barely work for serious track like I do