Jims5543

Yes, the bypass is in the water pump, pull the thermostat and you'll see a 1/2" hole, this is how you achieve a full loop when the thermostat is closed.



I have blocked it off so the full loop MUST pass through the radiator to cool down.



So far so good. I was on the interstate 2 days ago and hitting triple digits pushing her pretty hard, temps never got over 170-175. As soon as I let off of her, she cooled right back down to 160 (both fans running)



Now, this is in 80° weather which is cool for Florida, I am very interested in seeing how this works on a 96° day with A/C running. I am also very curious about how its going to work at a track day in 90°+ ambient temps.



All I can say is so far so good.

RE_TurboFB

Mazda uses a "bypass" type water thermostat. If you intend to use the water pump for a racing application this thermostat must be removed and the hole below it plugged.. a half inch NPT pipe thread tap and matching plug will do the job.



The thermostat should be removed and the bypass plugged for racing applications, But NEVER for street use!!

Do not use "flow restrictors" in the cooling system, Free flow is best...



I got this info from racing beat...

ColinRX7

Notice how never for street use and do not use flow restrictors are in the same paragraph.





Sounds like street use to me. The pump is suppost to work with a flow restriction. The OE pump. On the street. Street means typically running below redline.

Jims5543

In the history of my car I have never had issues cooling it on the street.



Its when I get it on a track that the problems begin. Hence my changes to the cooling system.





I'll take my chances on the street, it rarely gets pushed hard on the street and like I said the problems start on the track where I really do not need them popping up and ruining my day.

Jims5543

BTW - I run the OEM Pump not the racing pump. I also run a underdrive pulley at race events where I feel I will be staying in the upper RPM band.



It all boils down to what your comfortable with. I do not trust EOM or any other thermostats anymore, but who knows, come summer I might find that that car does not like this setup and I might be forced to put a thermostat back in it. I am still experimenting here I have only run this setup for 1 month.



In a few months I will have a better picture of what I am dealing with.