So what is the best thermostat to run? 160/180/195?

 

The OE 192/195 t-stat is ideal, although I like to run a high-flow 195* t-stat. You can get them from Summit. They help improve coolant flow when open, and tend to be more consistent with when they start and finish opening.

If you're overheating with a 195, blame your cooling system, not you thermostat. The t-stat is there to warm the engine up faster and manage the minimum operating temp, not the maximum. That's the job of the rest of the cooling system.

 

Thanks Guys,

Plenty of knowledge as always, I wish some of you lived next door, but hey this is the next best thing.

 

When would a person use a 160 or 180?

 

I read an article years ago about horsepower and torque comparisons between thermostat levels. I think different engines and tunes, like running at slightly different temperatures. Lower is not always better. Normal operating temp ranges from 190-210. 195 engine thermometer is about optimum for fuel efficiency. Higher temps are better for emissions and efficiency.

Remember, a 180 thermometer will not keep an engine at 180. An engine will run hotter than the thermostat rating because it opens and closes in a range. The effectiveness of the radiator and water pump (i.e. heat transfer) will also influence what actual temp and engine runs.

I have read that engines wear quicker at lower temperatures, so 160 is NOT recommended. I have also read that power is best in the 180-190 range, thus running a 180 is more power friendly, but not as fuel efficient.

This could all be bunk, but that is what I have read.

 

Thx UC. Good points!

 

Running cooler can, in theory, increase power by providing a slightly cooler intake charge. Some modern performance tunes are sold with lower temp t-stats with this in mind. IMO, benefits are negligible.

My car runs 190-210 most of the time, depending on atmospheric conditions and how heavy my right foot is. Mileage increases slightly when the temp stays at 210 during long trips.

 

can the instrument voltage regulator effect the readings of the various gauges? if so in what direction?