Highspeed

iTrader: (2)

I am in the process of replacing my coolant parts to try and update/improve the cooling of my 8. I am having the water pump and thermostat replaced but as well would like to get a new radiator and fans. I have found 2 and was wanting opinions please. Here are the links to the two I am considering. I am trying to not spend a crap load here.

http://www.ebay.com/itm/MISHIMOTO-04...sories&vxp=mtr

http://www.ebay.com/itm/RX8-RX-8-SE3...sories&vxp=mtr

Silver_Surfer

Dont forget the fan relay mods

9krpmrx8

iTrader: (46)

I have heard of fitment issues with the Mishimoto and the second setup doesn't have a shroud so that's a no go. I have the Mizu and like it very much.

But, check out www.sparkplugs.com if you go with the Mizu.

Here is my write up on it.

https://www.rx8club.com/showthread.p...highlight=Mizu

RotaryTherapy

iTrader: (1)

9krpm, is the Mizu dual pass or single pass ?

9krpmrx8

iTrader: (46)

It's a dual pass and comes with a lifetime warranty as well.

RotaryTherapy

iTrader: (1)

Thnks. The top nipple thing broke off on my OE rad, didnt like the Koyo design. It was between the Ron Davis, mishimoto and now the mizu

c0ldf1ame

iTrader: (5)

can't say for mishimoto or mizu but you cant go wrong with the ron davis, i have the mazda motorsports competition and fitment is spot on, they also make radiators for the speedsource cars

9krpmrx8

iTrader: (46)

I have a Ron Davis sitting in my garage, it is pretty comparable in build quality to the Mizu I got. I will also say I was really surprised at how much better the Mizu was packed with rubber covers over the inlets, etc. The Ron Davis was just in a box with padding. As for performance, yes the Ron Davis probably performs better but that is a non issue for the OP since he has a four port auto and is not looking to spend real money.

gregs

iTrader: (7)

off topic but 9k want to sell that Ron Davis?

9krpmrx8

iTrader: (46)

No sorry man, it's not mine, it's brand new. It's waiting to go in Hoss-05's car when his engine is finished being built and his supercharger goes on. He is out of country and I am babysitting his car and storing all his goodies until we can finish his epic build when he returns.

40w8

Highspeed,

didn't you say you put a trans cooler like mine on for your Auto?

I've upgraded that first install to the 18,500 Derailer which mearsures 14 deg difference at operating temp on a hot day (172-158).

what I also noticed is that cruising on I10 at 80 mph ( speed limit) on a cool 65 deg day the water barely opened the thermostat (running 175-177 deg).

If your water temp hasn't been brought down, I don't get it.

Just stack another 14,000 btu cooler on top of the 18,500, and plumb through in series.

I'm not kidding, the 18,500 brought both the water and trans temp down.

More cooler-more lower temp!

Highspeed

iTrader: (2)

I have the mishimoto AT cooler on the car. The temps came down a little but on a 60 degree day, I am still running between 195-205 for the water temp, dont remember off the top of my head what the AT was running at. I think it was 165. What is a normal operating temp for the AT and when is it too high? As for my engine cooling, I am going to have a new water pump and thermostat put on and would like to upgrade the radiator and fans. Since I have a AT cooler, I can get a manual radiator. I also have a much bigger AT cooler to put on the car from a Jimmy. He bought an RX7 that was an auto but he has converted it to a MT. It had a huge AT cooler on it and he gave it to me.

hoss -05

iTrader: (4)

Why upgrade the cooling system? What is the end goal?

Highspeed

iTrader: (2)

I am trying to get cooler temps. I do not think its normal on a 60 degree day for my car tobe running between 195-205 degrees and I am not even getting on it. When I went to the Texas 8 last year, it was in the 90's and running it hard through the canyon there, I started hitting above 235 degrees. Now, this might have been cause the AT was getting hot and since then I have installed a AT cooler, but my temp shouldnt be that high on a 60 degree day when just driving normal. Also, when I am at a light in 60 degree weather, I shouldnt be at a idle with a 210 degree engine temp.

9krpmrx8

iTrader: (46)

A properly functioning stock cooling system should get you where you wanna be. Thermostat, water pump, coolant flush, and test the fans to insure they are working properly. You also only have one oil cooler since you have an auto.

Highspeed

iTrader: (2)

Thanks 9K I will be replacing the thermo and pump in the next month as well as having it flushed at the same time. I have one cooler yes but I am looking to change that. I have a mishimoto tranny cooler on the car now however I now have a MUCH larger one I am installing in the next month as well. So, I will be taking the smaller tranny cooler I have now, flushing it out and possibly plumbing it in as a second oil cooler. I am just trying to make sure my 8 can stand the summers we have coming as well as the driving we will be doing for the Texas 8. Last year I was overheating but that was before the tranny cooler and all.

40w8

^
I was running my AC that day, and the water hit 220 f, and the AT 203 f.

For some reason on the track without AC the water is 213 f, and the AT up to 244f ( the last few minutes ).

AT temp to preserve fluid quality would be anything under 180 f.

To preserve trans never hit 249 ( I hear that puts it in limp mode).

My temps are definitely under control except for the track which is only a few minutes.

I suspect that the excess track temps on the trans is from high G slosh, and definitely from lots of shifting.

I like the track at MSR Cresson 1.7 where I slow down to 65 mph for the corner, and get back up to 90 mph which causes less shifting on the trans and less friction.

Highspeed

iTrader: (2)

40w8...what temp is a good temp for the tranny to be at when running it hard and shifting using the paddles since I am an auto...what temp should it never hit?

9krpmrx8

iTrader: (46)

40w8 (REDRX3RX8) has an auto as well, but a 6 port auto.

zoom44

9krpmrx8

iTrader: (46)

^ that's cool, I will be refining my setup (if needed) to mimic that in a way. But my aluminum under tray was done right, no useless holes due to a shitty design like that one.

zoom44

yeah , i hacked your phone to get it

Nopstnz8

iTrader: (6)

BHR Radiator?

Easy_E1

iTrader: (2)

Well now. Where have I seen that pic before?




Oh wait. I took it.

As far as the holes in back go 9k,,, I guess they (GT Spec) wanted you to be able to drain the radiator on USDM and JDM models.

dannobre

iTrader: (3)

http://www.rx8performance.com/produc...adiator-system

Heres another one