Ok. But on ms pnp, does the ecu need the water/engine temperature constantly, or just on startup? If on startup only the place i was thinking would just might work?

I don't think you can do that, it won't seal the stock water neck (not pictured) has an o-ring to seal it. Begi's cover is on top of that with a thermostat gasket, and we use freeze plugs. I don't think there's room for a thermostat gasket there.

If you want to bypass the stock ecu so its completely out of the loop and the fans are running on their own, run a thermostat on the bottom hose of the radiator. (160 degree thermostat sensor) Preferably if you have an aluminum rad, weld a bung right at the bottom. What this will do is keep your radiator full of cooler water regarding of engine temp. The thermostat at the engine outlet will control flow to this cooler coolant in the radiator.

What is the function of this part: http://www.mx5parts.co.uk/valve-mazda-p-773.html

Can i just take it off completely and leave the holes in the manifold open?And why is it called air valve?

Can someone please give me some information on how to do that? I know Trackspeed offers a freeze plug for where the neck is, but what do I do with the other plumbing?

Thanks.

Late to the party, but for future reference...

This device was used on the '90-'93 1.6l engines in the US, and probably elsewhere. It is a thermostatically-controller air valve, which sits inline with an air passage cast into the intake manifold, which draws are in from a bypass hole cast into the throttle body flange, and dumps it into the plenum.

https://www.miataturbo.net/attachmen...ine=1334695713

It is controlled by the temperature of the coolant flowing through it, allowing a bit of extra air into the intake when the engine is very cold. The factory manual test procedure calls for it to be cooled to 32°F, but does not give an actual spec for what temperature it normally opens and closes at in typical operation.



A lot of folks think that this valve was unique to the 1.6 Miatas, but the '94-'97 cars had it as well. On that application, it was integrated into the lower section of the throttle body, in the same housing as the IAC solenoid.


https://www.miataturbo.net/attachmen...1&d=1361124623
It's the part labeled "Thermowax" and "Air Valve."



Just remove the hoses from the throttle body and air bypass valve, cap them off with rubber plugs (optional) and install a new hose between the port on the lower intake manifold and the port on the thermostat housing (if present) or mixing manifold where the hoses you removed from the throttle body and air valve came from.

Zombie thread revive:
Is the Kia thermostat housing cover the same as the water neck?
Searched all the old threads, the JC Whitney part number pulls up nothing. Found this guy on Amazon for $12.26 though...
https://www.miataturbo.net/attachmen...ine=1361121967
ASIN: B004HOA00U
Item model number: 311-0024

same-same?

EDIT: Just compared it against the BEGI website, appears identical, down to the "2-2" stamping on it.