Is it a recomended upgrade for a modified T2 S5?
Anyone who has done it?

 

Ive looked into it myself. Basically the stock oil cooler, when working properly, does just fine. It surpasses the cooling capability that the car needs, just make sure it is clean and flowing well.

 

Personally if I can't lower my temps I am going with a properly sized fluidye or the like. They have many sizes and capabilities, and would eliminate the need for all the extra lines that a second cooler would require. Most are under $300 btw.

 

Why are you having cooling issues? Is it because of high horsepower or just general cooling isssues? If it is the latter, I would suspect that unless your radiator is blocked, there are other gremlins at work.

 

FMIC and a fair amount of power are my issues. New lines, engine, cooler has been flushed. The FMIC is the main problem. My first step is to check for proper operation of the stock thermostat, once that's confirmed I will look into ducting. Try these first as they are the most inexpensive.

BTW yes someone on the board has installed another cooler, I just think an aftermarket one is a nicer option in terms of lines that need to be run. The tricky part is finding a cooler that won't over cool the oil as most don't have thermostats. Use the search to find the thread, I was reading it just a few days ago.

 

A second oil cooler of the same as the original will drop your pan oil temps (not a normal place to put a oil temp gauge, I suppose), an easy fifteen to twenty degrees....from what I've personally seen. I don't see where you'd put one since you have a fmic.

You asked about oil coolers and you get talk about water radiators. Go figure.

 

Search for a post by C. Ludwig. he installed a second cooler on his ITS racecar, and he did a pretty good write-up. he also got flamed a bit for trying something new, but that is the second gen. forum for you.

 

https://www.rx7club.com/showthread.p...ght=oil+cooler

The link for molehill, and any other interested parties.

 

Thanks for the link!
I just wants to play it safe, that´s why I´m thinking
about this mod... I have a custom radiator that is 4" lower than stock and I´m a little bit worried that it isn´t enoght! I haven´t started the car yet... so I thought it would be better to fix it while I´m at it...

 

Do you have an oil temp gauge? If not, you have no idea whether you even have a problem, and you may be wasting your time and money on a mod that could lower oil temps too far.

Most people never have oil temp problems with the stock oil cooler.

 

Lower temps too far????? Nah. There's a Oil Cooler Bypass Valve in the cooler that......bypasses the oil as long as the oil temp is 150 degrees or cooler.

Get up some morning and start the car. After a few minutes touch the cooler where the oil inlet/outlet lines enter/exit the cooler. That end of the tank will be hot. Now touch the other end of the oil cooler. It's cold to the touch. That should be done prior to the water temp reaching too high a temp.

Putting on the second cooler will be a good exercise for you.

 

Which is well below normal oil temps. Sorta proves my point.

Additional or upgraded oil coolers are for real oil temp problems, not imagined ones. An oil temp gauge should always be installed first.

 

And.......what is NORMAL oil temps???

And......since the cooler begins to cool at 150 degrees, by Mazda design, then I think I can make a case that anything over 150 needs to be cooled.

And I might add that extra oil capacity never hurt anything.

 

Someone correct me if I'm wrong, but I believe normal is around 175-180degF. IMO 140-150degF (when the oil cooler thermostat opens) is too cold.

Remember the oil cooler thermostat will not regulate oil temps like the coolant thermostat will, because the oil normally much hotter than its opening temp. Once the oil exceeds 150degF the thermostat is fully open and it'll stay like that until the engine is shut off and the oil cools back down.

If your oil temps are normal and you double the oil cooling capacity, logically you'll drop oil temps below normal. The stock oil cooler has proven it's worth on very powerful turbo engines, so I see no need to upgrade it unless you actually have a problem.

 

where should this oil temp be measured at? is the pan a good place?

 

HAILERS, didn't you install an oil pressure guage? (recently?)

What are your 'normal' oil temps?

 

A good place to monitor delivery temperature is at the high pressure just after the stock oil cooler and at or before the filter mount.

 

What was the Oil Pressure @ Idle, out of curiousity with Both Coolers at work? Any additional mods to the Lubrication System with the dual Coolers?

 

mine is below the oil filter in an RB filter thing. mine is normly 170-190f. it'll drop down to 150-160 on a cold night on the highway.

 

You've got the Duals Scott?

*edit*

Nevermind. I see It was a response to jhillyer.

 

Pretty hard to read temps off a pressure gauge...

 

Regarding installing an additional stock oil cooler, yes people have done it, it's not too rare.
I utilised this setup on an FC before even.

It's dirt cheap to do (free-$50), easy to install, and works really good too. The factory oil coolers are pretty good - a lot better than most factory oil coolers on other cars.

 

What is the problem with the oil being to cool? I see that it would thicken but would cool 10w30 be any thinker than normal 20w-50? or is there something else bad about the oil being to cool?

 

Yes. It was a oil temp gauge, not a pressure gauge. I think WhiteFC had a slip of the finger there.

Unfortunalty I put it where the Sub-Zero sensor was. It's not useless there but it's more normal to put it at the filter base, and I do have one of those Racing Beat adapters off my 82 that I'm going to put there.......when I get in the mood.

The temps in the pan (hottest temps prior to the cooler) WERE running at 165 degrees but that is a lowball figure. The spring is over and summer is on its way. Lately the temps are running closer to 180. Thats at 70 mph for ten or more miles. I can control that(load on the engine) but not the air temps outside.

When the air temps settle down I plan to disconnect the extra cooler and put two hard caps on the outlet to it and just run the original unit.....check out the temps.....then reconnect the second cooler and checkout the temps and compare.

If nothing else it was an enjoyable exercise in buying the hoses and unions/adapters and fabricating the spare cooler in. Kept me out of the bars and off the streets and away from the tv and websites.

 

Ah dang.. NZConvertible got me there.. definatly was a slip of the old finger (or mind..)..

Should really stop posting after i've had a few beers..
At least you guys knew what I was talking about