I just found out that there is also a 160 degree thermostat, anybody has one?! Any pros? or is it just going to help run your car cooler?
Change (or remove) the factory thermostat
This is based on the fact that cooler air is denser, so the less you heat the air coming into the engine, the more air/fuel mixture you can pack into each cylinder. An old shade-tree mechanic fix, but it's got several strikes against it. First, you never want to remove the thermostat completely. The cooling system has been designed with the thermostat restriction in mind, and removing it will actually _hurt_ cooling. Second, cylinder wall wear increases as operating temperatures are lowered. The stock Mustang thermostat is set for 196° Fahrenheit. Dropping to 180° will increase wear somewhat, and dropping to 160° or 140° will increase wear dramatically.
On EFI cars, cooler thermostats are rumoured to increase performance because the engine will run richer at temperatures below 180° Fahrenheit. True, the EEC-IV will richen the mixture, but staying in "warm up" mode entails more than just a richer mixture. The EEC-IV will be more conservative with the timing curves, and will never get into "closed loop" operation (where it uses the oxygen sensors to fine-tune the mixture). The result will likely be poorer drivability and decreased performance. Also, catalytic converters can be damaged over time by an engine that's continually running rich.
VERDICT - Don't remove the thermostat entirely, and don't use a thermostat below 180° Fahrenheit on an EFI car.
Totally agree I'm tired of hearing that a car will remain in open loop with a 160 T-stat. All it takes is a scanner plugged into your OBDII port to realize cars switch into closed loop at temperature bellow 100 degrees F.On my OBDII mark 8 the sensors start switching at or about 90 Degrees of ECT, so the car doesnt get stuck in "open loop" either.
Thermal Efficiency?Thermal efficiency is a big part of the engines. The cooler you run the engine,
adding that when the water gets above 220 degrees, the motor loses power.
Funny you mention Nascar.... I can tell you there is on major difference between a Nascar engine and a fuel injected mod motor... I already gave you hintThermal efficiency is a big part of the engines. The cooler you run the engine, the less thermally efficient you are. I have always heard this from many mechanics. You would never even notice a difference. If you wanted to show a difference show some tack slips of stock/180/160 thermostats with whatever EEC updates you wate. Of course these engines are rebuilt every race, but here is what they do at Nascar.
Heat is on
Steve from Redwood City, Calif.: At what temperature do the Nextel Cup teams run their engines? Specifically, what water temperature do they consider "normal" ... 180 degrees, 230 degrees .... ? I'm interested as I've seen debates on whether an engine gets more power when it runs "cool" versus runs "hot."
Tom Jensen: I walked out in the garage here at Phoenix and put your question to Robert "Bootie" Barker, crew chief of Johnny Sauter's No. 70 Chevrolet. He told me that optimal temperatures are 200 degrees for the water and 240 for the oil. In general, he said, teams try to get the oil as hot as they can, without driving the water temperature up too much, adding that when the water gets above 220 degrees, the motor loses power.
Optimum manifold temps are vastly different for "carbed cars" vs "EFI cars".And what's that have to do with the explanation of why a lower water temperature is better and why the optimal temperature is different for a carburetor?
not enough real "DATA" to give a horsepower estimate.haha I said tack times. And Nascar would cut it off like you said, but they found the optimal temperature to be what I posted.
Well relating to the track times I first ran my Cougar at 15.7. All that was done was an aluminum cold air intake all the way to throttle body, underdrive pulley, and modified the MAF. Now I get 15.3S. According to your calculation what horsepower increase does that make?
Also I'd like to see you start cold first and then hot to see the difference hopefully with less time in between.