Hey guys, i bought a new thermostat (stant) and for some reason it doesn't open until the car is nearly overheated (3/4 up) then the car runs nice and cool. This is obviously not good, what thermostat should i use for racing track days.

 

get an OEM thermostat..Stant is crap..problem solved.

 

With a rotary engine ALWAYS use a thermostat bought from the mazda dealership or from mazdatrix. The oem thermostat seems to be the only one that works properly and reliably. In fact mine has the original thermostat from the day the car was bought. i have an extra one sitting around just in case. They cost maybe $30 shipped with a gasket. i know that you can get one for $10 from autozone, but this is NOT a part to cheap out on. It functioning properly is the difference between rebuilding your engine or it lasting for another 100k miles.

 

I had overheating problems with my stock oem thermostat and I ended up removing it completly and my problem was solved. Then again I only drive the car in the summer so it doesnt bother me.

 

and the thermostat is in the Cooling system for a reason.To Regulate coolant flow so that it will actually allow the engine to Saturate the coolant with engine heat and then flow to the rad to dissipate it when cooled through the Rad.
No thermostat is NOT RECOMMENDED and will cause you to be a Member of the "Rebuild Club".
If your cooling woes went away by taking the thermostat out,then your Original Cooling problem still exists.

 

In that case the thermostat could have just needed replaced. A thermostat can go bad. The one in my car happens to be original from 28 years ago and works fine. The previous owner took great care of the car. However knowing it is that old I keep an extra one in the car in case of an emergency alongside a bottle of coolant. At the same time my friend has to buy a new thermostat almost every 5 years for his truck or pretty much every coolant change or it goes bad.

 

pittit racing has alot of nice parts i found that prices are ok, just ordered one my self

 

try running without a thermostat for a little while.

The thermostat helps to warm up the engine and coolant will not circulate through the radiator without reaching the operating temperature of the thermostat.

if you still have overheating probs... you can't buy a thermostat that will help you.

Also, if your radiator cap is failing, you can't maintain pressure in the system. A pressurized system will boil at a higher temp.