Mishimoto Thermostat

DEpointfive0

Someone is welcome to correct me, but the 150 degree thermostat means its FULLY open at 150 vs stock 180...
Which means the water temp probably won't reach 150 unless you beat on it because the thermostat will still be open at a lower temperature

kenny's 370z

the 180 starts opening at 180 and what i have read on this forum its not fully open until 200f so the 150 should be wide open at 170

ShutokuZ

You are correct sir! So, with the thermo open all the time, it is constantly circulating the coolant keeping the temps below the 150deg rating. A good way to test it (or even see if you suspect a faulty thermo), warm a pot of water to 150deg (or whatever deg rating on the thermo) and drop it in. You will see it open and how far it opens.

Edit, above is right, thermos usually fully open around 20deg past the rated temp. So, the 150 would fully open around 170, however it is still partially open at 150, causing coolant to still circulate, although not at full capacity. So, for DD around town, the car will stay around 160 unless on the freeway or pushing it hard on the streets. That is when it would get up to full opperating temps. I could actually see my temp needle moving in my Evo when I pushed it, then let off for a while.

kenny's 370z

you dont have to beat on it for it to warm up and go past 200 even with my modded stat.remember this car has a 1 row 15mm radiator on a performance engine.if it would have had the correct cooling capacity on this car then i wouldnt be having to go through extreme lengths to keep it cool which is a royal pita.

now if you drive like grandma,then disregard all of my replies even though the water temp is still going to rise at idle or in traffic with stop and go.especially if you dont have the uprev fan control.with the 180 stat,my water wants to run at 192 and jump to 200 at idle.i have also read the ecu starts cutting timing when water hits 190.so with the oem stat,you dont have very long from a cold start before the ecu starts to cut timing,or power.my car runs great when my water is at 160-170.wish i could keep it there 100% of the time after initial warm up .

binary0x01

This is true; when in traffic there's no ventilation you just sit there and bake. I will def put this thermostat on the car if you won't throw any CEL or run into anything unsavory when you do your test man.

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kenny's 370z

mine should be here next week after i get back from the mountains and i'll let you know.

ShutokuZ

I am hoping it works out for you bro! I was reading a few threads on here about people that had them. Some said good to go and some said got the CEL. Guess it all comes down to location/mods/use ect......
Anyways, good luck!

kenny's 370z

thanks ! me too man,me too.

ShutokuZ

When you get it, do the hot water test to see the true opening temp. I am curious if they do start ot open at 150, or it is just claimed. Mine before started to open 5 degrees cooler than specs.