This is a quick post on water and oil tempts, alot of people are getting tempts well above the 80°C mark on water and oil and in some cases into the 90's!!
Unless your giving it some or driving around the track, this is way too high...
To give an example of healthy tempts, while cruising on a 14°C morning the tempts shouldn’t even get hot enough to register on the MFD...On a 23°C day
with an intercooler temperature of 25°C they should be registering 71°C to 73°C in normal driving and a 3°C difference if giving it some throttle...
If your GTR is registering tempts up in the 80's or 90's its time to change the water pump and thermostat ...Nismo has designed a low temp thermostat which opens up at 62°C where as the OEM stock opens up at 75°C and a good upgrade to the stock OEM water pump is the N1 water pump, while doing these if the timing belt needs changing it would be a good time to swap it over as well.
As for boiling sounds comming from/in/around the engine bay this is not normal and should be taken care of with the above