Hey everyone! I am getting ready to get the car out of its 6 month hybernation. Over the winter I bought a Nismo thermostat. I am getting my Greddy guages installed next month. For the egt guage I have to drop the motor back out to drill and tape the exhaust manifold. I am debating putting on the stat. Here is why I first thought it would be a great addition to my car. I only drive this thing when its nice and hot outside. But I dont like to get it on the highway for 2 reasons, rock chips and cops!!!! So I stay on secondary roads as much as possible which doesnt allow alot of airflow. Doing so I have noticed the temp up a little more now with that big Greddy innercooler in front of it! What are you California, TX, and Florida guys doing that are TT'ed when the temp gets real hot outside? I want to keep my temps as low as possible. Will I notice a difference in temp with the stat or should I just keep the stock unit! You guys with this stat can you see a difference in your temp guage? Does it still ridde in the middle? Thanks for all your opinions, no smart azz comments please! Keep it constructive! I want to hear from people who have used these parts. Thanks guys, Robert

 

in the end, the thermostat cant prevent your car from reaching peak temps, only slows the process down a bit.

 

Ok, my logic of thinking was that being the stat would open up sooner it would help keep the engine/turbos/oil cooler than now. But I guess your right. Eventually it will reach the higher temps anyway. Do you have this stat? Thanks, Robert

 

get an oil cooler if you dont have one already

 

I have the Nismo Stat.... It does keep temps mostly at 170..

 

hmmm...its advertised to open up @ 154 deg F. stock opens up @ 170.

 

That's exactly right, I never understood why people make a fuss about which thermostat to buy; Except for high speed driving on a cold day the cooling fans on your radiator is what ultimately controls your engine while driving around town on a hot day. So unless you can rewrite the software on the engine ECU, the radiator fans turn on and off around 210F/200F.

 

But whats the purpose of the Nismo stat then? If it opens up a little sooner in temp, in therory wouldnt the movement of coolant threw the system be cooling it down better. And possibly not making the fans run so much? In my way of thinking the fact that the oem stat doesnt open til 170F, with my Greddy innercooler in front of the radiator blocking air flow. The system itself would cool better because its opening up sooner. I didnt know that the fans didnt kick on until around 200F. Thanks for the info! Robert

 

think of it this way lets say your car warms up to 200 degress normally... if you had the super duper nismo thermostat that opened up at 50 degrees, will your car stay at 50 degrees... not a chance. it just slows for a little while. in very cold temperatures it might help keep the temps lower but in cold weather cooling shouldnt be an issue. in the summer your gonna reach 200 degrees even without a thermostat. its a ok mod to have but really it doesnt accomplish too much. one thing it might help with is at the drag strip. since your car only runs in spurts, the lower temp thermostat could help you keep the temps down a bit more before each run.

 

So its not an upgrade that brings much to the table. Ok, how about a Koyo radiator? If the motor is going to hit 200F anyways why do so many guys switch to a thicker radiator? Is it more coolant? Other than that it doesnt really serve a purpose. So with the innercooler I just have to deal with the higher temps? I am new to turbo stuff, I was just trying the best way to keep it cooler. Thanks for everyones info!

 

Larger = more surface area = better cooling

 

a larger radiator still isnt gonna keep you at anything lower than 200 degrees.

 

Right again, People who modify there engines to burn more fuel are producing quite a bit more heat. The factory radiator can only dissipate so much heat. If your burning enough fuel (ie producing enough horsepower) your factory radiator will not disspate it fast enough and soon your radiator temp will go over 210F even with both fans running. A larger radiator can dissipate more heat in engines running more than stock horspower.

 

If your running twin turbos, a larger Koyo radiator is wise investment. Many people don't realize than heat produced in crank bearings, rod bearings, and turbo bearings is mostly dissipated by the oil flow. That is the oil enters the bearing it is then heated and the heat is carried to the oil pan where the oil is allowed to cool a little before being recycled again. Besides a larger radiator, the next best investment is an external oil cooler IMO. It's basically a radiator for your motor oil.

 

How do you install an oil cooler? Where do you run the in and out lines to and from? If I would buy a Nismo oil cooler would it come with everything needed to install? Is it as simple as putting a plate in between the filter with an in and out fitting on it? And does that come with the cooler? Good point Brazen!

 

I not sure about the Nismo oil cooler, I seen the stillen which looks exactly like GTM oil cooler which I purchased for $380, Yes there's everything you need except instructions. I had to use a dremal tool to cut and modify. around the front bumper fascia (I have already removed the bumper grill) and I mounted the cooler on the driver's side. If you search the DIY section there are a few external oil cooler installation threads.

 

oil cooler huh...i ll keep this in mind for my project...but isn't there a stock oil cooler?

 

There's is some debate weather it is a oil warmer or oil cooler. In the DIY section there is a oil warmer/cooler removal thread by Quadcam. If you look at the engine diagrams you will see that a small amount of engine coolant is pumped through a oil sandwich adapter. At best your oil can only be cooled to engine coolant tempertatures before being pumped into the rotating bearings. I can't imagine that is an efficent cooling process. The external oil cooler works like a radiator and uses air flow to cool the oil. I believe that I read somewhere in this forum that Nissan discontinued the sandwich oil cooler/warmer on later model 350Zs.(someone correct me if I am wrong)