1FooknTiteFD

Does anyone have any numbers for the sake of comparison between the oil temperatures of a stock RX7 touring and one that is equipped with the CWC oil cooler? I want to know if there is a significant difference in cooling after upgrading to the dual oil coolers. Also for those of you who own this kit, are you all happy with it or would you have gone a different route if you could do it all over again?

JBC

I saw a 20-30 degree drop during normal driving. Crusing with the dual CWC I see temps around 165-172deg. Before it was around 190 with the single cooler. If I did it all over again I would get the RE dual 25 row kit or possible the dual 34 row kit....of course I want to get a front end with larger openings to take advantage of the extra size.

1FooknTiteFD

thanks for the info JBC...questoin though: how are the steel braided lines holding up on your car? and also how are the fittings doing also?

well does anyone have any data on either one of rotaryextreme's oil cooler kits? I really haven't heard anything about this kit regarding the installation, fitment, or cooling.

rotaryextreme

iTrader: (2)

You are not going to hear anything about the kit other than from me because I only sold 2 kits so far and the buyers are not the forum members. The price of my kit scares people away even though it's the largest oil cooler kit you can buy on the market right now.

The oil coolers are larger than the CWC one so it will cool better. Installation is about the same as the CWC. The fitment is no problem either. I have been using it on my car for 18 months already. No oil leaks or anything. The fittings never came loose

If you are just going to do some city driving and you don't take your car to 150+ mph and run it for 30min to an hour like I do, you don't need my kit. The CWC one works fine and a little cheaper. The only thing I don't like about the CWC kit is how they mount the thermostat. It comes loose sometimes. Where I put the thermostat will not have the same problem. For the CWC one, you probably can fabricate a bracket to secure the thermostat. Other than that, there is nothing wrong with the CWC kit.

The oil coolers are all made by Mocal so bigger is simply better. Bigger costs more as well. Mine is better simply because it's bigger. There is no secret about it. Bigger oil cooler holds more oil as well so you will have more oil to circulate the engine.

Chuck Huang

rceron

I will check out your site in a bit, but does your kit come with ducts?

Do you have them in stock and will they fit with a stock front bumper?

thanks

ptrhahn

iTrader: (9)

Chuck:
Do your kits come w/ ducting? This one thing about the CWR kits that was attractive... better than stock ducting.

rotaryextreme

iTrader: (2)

My kit does not come with ducts. There are too many bumeprs out there and it's impossible to make an universal duct. On my car, I made a custom duct to work with the c west bumper. Recently I switch to the FEED bumper and now the duct does not fit.

The oil cooler itself is sitting much more forward toward the opening of the bumper so you don't really need a duct. The opening of the bumper itself acts as a duct already.

The kit works the best with an aftermarket bumper with large opening. On the 34 row oil cooler, the surface area of it is about 4 times the surface area of the opening of the stock bumper. I personally think it will be a waste of money if you don't replace the front bumper to take the advantage of the larger oil cooler surface area. The GTC bumper will be perfect for the oil cooler kit.

I don't keep the kit in stock because it's not a hot item that I sell a lot. It's made to order and you should expect a 2-3 week lead time on it.

Chuck

JBC

I haven't had any problems with the fittings....I did have an issue with the thermostat which leaked immediately and it was a real pain to get a replacement.

To respond to Chuck's comments earlier.....I know of a car with the CWC kit and no ducts....he has a 99 front end and his oil temp numbers are identical to mine. bigger the better IMO as far as oil coolers go. I think when I got mine, Rotary Extreme was not selling a kit yet.

ptrhahn

iTrader: (9)

Great info, Chuck.
Approx how close to the inside lip of the opening does it sit (the stocker is back about 4-5").?

I think a great help would be to relocate the washer reservoir and get a better exit path for the air... it would make what DOES get in work better. I'm pretty much resigned to the stock bumper until something flexible is made available.

rotaryextreme

iTrader: (2)

You have to wait until I get back to the US to get some measurements.

If I remember correctly, there is nothing on the back of the oil cooler. The only thing behind it is the mud guard. I have seen some Japanese racers drill holes on the mud guard to let the air exist more easily instead of going through the little hole at the end of the fender.

I don't know if you mean that you want some flexible bumper. If you do, you should consider the ING+1 bumper. It's made of urethane.

http://www.ings-net.com

I am doing a group buy on it now.

Chuck

ptrhahn

iTrader: (9)

Wow,
I'll actually consider it. I was under the impression that the ONLY urathane bumpers were the 93 OEM and the 99 OEM. Are there others?

As i recall, the stock oil cooler basically backs right up to the winsheild washer reservoir.

rotaryextreme

iTrader: (2)

Other than the 93 and 99 bumpers, the only other urethane bumper is made by INGS+1. It's pretty good looking in my opinion. A little like the c west but smoother. Did you check out the photos?

The windshield fluid reservoir should be above the oil cooler. It does not go all the way down to the level of the base of the oil cooler if I remember correctly.

Chuck

OC94Rx7

Here is a photo of a vented stock oil cooler. It's from a guy in Japan. Not a race car. top/left photo is behind the cooler. Not a first class job but I am sure it helps.

DavidDeco

I saw a huge drop but my stock oil cooler (had only 1 ) was pretty beat up.

Without the ducts installed ( I needed ducts for my then soon to be installed new bumper), dropped about 20deg C according to my Oil Temp gauge. That was about October.

THEN I added the Scoot hood/ Feed v1 bumper and installed the larger cf oil cooler ducts all together I saw another 20deg C drop.

It is cooler here though but it's Florida so it's not THAT much colder. About 20F between October and now if that.

When I got my car back from rebuilding 6 months ago I was typically running Oil Temps around 110C. With the CWC, ducts, bumper, and scoot hood I run 60-85C typicallyaround 72C. It'll get to the 80's only when I've been running it hard and then stop at traffic/no movement.

1FooknTiteFD

thanks for the info chuck. However, does your oil cooler come with stainless steel braided lines? I've noticed that a lot of aftermarket oil coolers come with them, but won't they scratch up the engine bay? Why do they all come with them then?

Air-Rex

Hey Chuck, I was wondering how low your 34-row cooler sits. Does it block the brake ducts. if so what about the 25-row.
thanks, Eric

Air-Rex

Oh yea if it matters I'm looking at getting the Mazdaspeed R-spec, front end. Ever think about making a replica?
Thanks again, Eric

BoostedRex

I'll be going with the kit from Chuck's webiste. That kit looks to be the best thing going in terms of upgraded oil coolers. Just my .02

Zach

jumprdude

Isn't there a little air channel duct that attaches to the back of the stock oil coolers and routes the air through the coolers and on the inner side of the wheel guard over the wheel to the rear and eventually to exit the side ducts on the FD?

Or am I on dope? I thought there was such an air duct. Perhaps it does not exist on the passenger side on the Touring models with no passenger side oil cooler, but it exists on the drivers side.

BoostedRex

And all that time I thought those vents on the side of the FD were for brake cooling. I really really really need to spend more time under the car rather than in it!!

Mazderati

iTrader: (3)

Check out Cripsy's site regarding oil cooler venting.

http://reganrotaryracing.tripod.com/fendvent.htm

I wouldn't mind having an upgraded oil cooling system as well. I've thought about trying to put one together via parts from Summit and Jegs while sourcing an oil cooler from somewhere else. Granted there is profit to be made in everything, is the cost of putting together an oil cooler kit really that high? Thanks.

Kyle

Mazderati

iTrader: (3)

A few other things...

I have yet to look at where the oil cooling system attaches and exits on the FD and how it circulates; any comment on this? Are the aftermarket jobs the same way?

If I did, in fact, put twin oil coolers on my PEP, how would the oil flow to the second oil cooler? Would the oil go first to the driver's side oil cooler and then be routed to the passenger side oil cooler or would oil be routed to both coolers simaltaneously? How does the stock system work regarding this matter?

Thanks.

Kyle

JBC

The flow of oil goes like this......oil exits the front cover then flow to passenger side oil cooler...than drivers side then returns to oil filter neck....where the oil temp and pressure unit are.


So in my case the CWC coolers are dropping the temps into the 160-170 range before it enters te engine again.


Anyone have any idea how hot the oil is when it enters the oil coolers?


Prior to purchasing the CWC or CWR kit I priced all the parts and I could have saved 100-150 bucks or so but that is w/o ducts and brackets. If you have some spare time on our hands you could save a little money.