2ZR Turbo Yaris

[tmontague]

Originally Posted by 06YarisRS

Not sure of the optimal spec but testing procedures are something like the 124 - 178 range. I thought about it a lot and Derale recommends putting the thermostat where I did - before the aftermarket cooler. If the fan runs too much, I'll swap it to the other line. Since the rad likely hovers around 180+, it may well make the fan run too much. I believe the thermostat kicks in at 180 and out at 165, but I'm not sure if the in-rad cooler would bring the fluid up to 180 or not. I guess only time will tell.

Not sure what you mean that it might be a wash. Do you mean that you think it might not be effective at all? The way I look at it, any additional cooling has got to help.

Thanks.

I was referring to having the thermostat placed downstream vs upstream may be a wash. No doubt an additional cooler will help.

I'm just thinking that the outflow of trans fluid from the rad will almost never be below 165 (in the middle of summer) and the fan will be constantly running. But that is just my speculation based off of what coolant temps in the middle of summer.

That said, this is new territory for me so what others recommend who have been down that road would be best practice