Curious if anyone knew if there where any down falls going with the cooler thermostat from mishimoto ?

Mine is junk and need to buy on asap so if you have any experience with them let me know.

 

I'm sure the mishimoto is fine. I'd go with that or an Ralliart.

 

I have been running a Ralliart for 30K miles. It has been running cooler than stock the entire time. I do flush the system about every 12-15K miles though.. Just my OCD kickin in I guess..

 

If you do the Ralliart thermostat, do the high pressure radiator cap at the same time so that they can both work together.

I got the Greddy hi-pressure radiator cap for my evo, to dress up the engine bay, and it was causing my cooling system to lose coolant... and I would have to add coolant every other day.... I dont know why, but when i switched back to stock, everything was fine again.

 

It's good practice to change the radiator cap every few years. It is a failure point. Cheap insurance in my book.

 

If you live where it gets cold in winter you should stick with the OEM stat to maintain heat in the cab. I like to be toasty.

 

Ive been trying just to find a OEM replacement around where I live and all the stores have them in their computer as lancer thermostats and there all wrong. I just wanted to get a replacement in there.

If the mishimoto thermostat wasnt 60$ I would have bought it. But for a thermostat that's normally 10$ I dunno. Id rather just take it out and not run it in the summer time. Make for a real cool motor.

 

Yeah, I found out the same thing, and the lancer thermostat even looks right with the rubber ring and all. So, I had it all apart when I found it needed to be a third bigger. Back at the store we checked the numbers again and sure enough, all the books call for the lancer thermostat. I got one from the dealer - a 200 mile drive.

 

If you are going to run an aftermarket thermo, stick with Ralliart. I don't know anything regarding the Mishimoto and quality control or even where it is made. If there's an actual write-up on it and it worked, then I might feel good about it, but then again, I'd stick to either OEM or Ralliart.

 

The engine control program is setup for a thermostat that controls the engine temp to 80 deg C. If you get the 70 deg C Ralliart, the car will not run as it should. I can't really be specific because nearly every aspect of the engine management is set to begin operating "normally" when the coolant temp reaches 75 deg C.

 

Low-temp thermostat means it opens at 70 degrees C, not that it is going to keep your car at a steady 70 degrees C. It opens early to start circulating through the entire cooling system. Prior to it opening, the system is closed at the thermostat, allowing the engine to warm up. The car will warm up to it's pre-programmed setting, regardless of it's a low-temp, normal temp or no-temp (ghetto for running around with no thermostat) thermostat.

 

I'm pretty sure that with the Ralliart thermostat, the engine will run at 70 deg C under daily driving conditions.

 

That doesn't make any sense and defies the laws of physics. If this was indeed the case, Ralliart would be holding a patent for ability to defy the laws of heat transfer. as far as mods and EMS goes, it's always the smart choice to re-program whenever doing mods that will change engine operating parameters

 

A thermostat is a feedback type device that does regulate temperature. How else would my coolant temp run at 180F during daily driving regardless of whether the outside air temp is 5 deg F or 105 deg F? Of course it is possible for the engine to generate more heat than can be dissipated even with the thermostat going full open. Then the coolant temp will rise beyond the regulated temperature. I have yet to see that in all my logs, but others who actually push the engine for extended periods see it happen.

 

You are mistaking a thermostat, which is nothing more than a temperature-actuated mechanical device (coolant heats to a certain temperature value and the spring relaxes and opens to allow the flow of coolant; if it didn't open, it will over-heat and as a by-product of heat, pressure rises leading to bad things for combustion engines), with a sensor, which is a feed device. If a thermostat was a device that directly controlled the cooling of coolant, then why do we have radiators? The thermostat doesn't do any direct cooling. It assists in the process of heat management. Cooling is the job of the radiator, which is a heat exchanger (just like the intercooler and the oil cooler; heat exhangers), working in conjunction with cooling fans. The cooler the radiator is, the more flow of hotter coolant to the radiator (heat is attracted to cooler temps, and so is high pressure attracted to low pressure; water pumps exist to help move things along, since the by-product of heat, which is a proportional rise in pressure, doesn't create enough fluid motion to cool things down optimumly in combustion engines).

Don't believe me, then ask any science/physics teacher who understands heat transfer and thermal dynamics.