Quote Originally Posted by Bigrig View Post
On the colder thermostat part - yep, true if it's running properly you shouldn't need a colder thermostat, however if you have it running properly (like mine) but have heaps in the way of the radiator (like mine), such as spotties, intercooler, air con radiator, oil cooler etc, then air won't be getting in as effectively and efficiently and as such, you may not be cooling properly and think its mechanical/cooling system related when it is simply airflow restriction - like me, most people don't remove the obstacles listed above, and simply fit a colder thermostat ...

How'd I go Tony? Did I pass the test??!! lol
A colder thermostat won't increase cooling capacity, it will just open at a lower temperature.

As Robo says in post #8 running a colder thermostat can lead to enrichment issues on some engines, and you did have an issue with this last year when your engine coolant temperature sensor failed.

Colder thermostat's have their place but they shouldn't be used to mask short comings in the cooling system. Get the basics right first and if you need more cooling capacity do it properly with a higher capacity radiator and increased airflow. Short cuts will always come back to bite you on the ar$e.

Tony