CantGoStraight

Do a search for the term "Heat Soak" and see if that may match the issue your having.

rotarymandan

iTrader: (15)

Really? Why is that?

moconnor

iTrader: (14)

'Cos they are water cooled. Search for many threads on this topic.

moconnor

iTrader: (14)

The consequence of that was far from clear. Turbos timers are usually designed to keep the engine running, not just the fans. Usually you need a fan controller or the stock fan recall box to keep the fans running.

I have no idea what a thermos is here. Where I come from, we use a thermos to keep our tea warm.

Boro FD

Why dont you just set your fans to come on earlier with a datalogit.

moconnor

iTrader: (14)

Setting the fans to come on earlier keeps the temperatures low while the engine is running. It will have next to no influence on post shut down temperatures. My fans are set to come on at 85C and I rarely see above 87C even when driving hard. However, after shutdown I see 110C+ within a few minutes.

fendamonky

iTrader: (6)

Honest question here..

The point of modding things to make the radiator fans run while the engine is off is...?

I don't see how it's worth the effort. It's pulling air through the radiator, however coolant isn't circulating so there is only a small pocket of coolant effected. The fans are moving air in the engine bay, however it's all very hot air... so there is still that whole heat sink issue, which is the main one to begin with...

What is so hard about driving responsibly for a couple minutes before shut down, and if you are that concerned about shut down temps, pop the hood and chill with your car for a couple minutes afterwards. At the very least that saves you money on a worthless gadget and allows heat to escape your engine bay..

Boro FD

Yes, very true. I see similar temps to that also. What if an electric water pump was added inline to work with the fan mod ?

CantGoStraight

Yes adding a pump to circulate coolant when the engine is not running would aid the fans ability to cool the engine and engine compartment. Even though the fans running only may not seem cry effective there is some cooling and coolant movement in thef cooling system. How you ask ? Convection movement, when you pass cooler air over the radiator it lowers the temperature of the coolant in the radiator with the coolant in the engine area being hotter you get differential and this a slight movement of coolant in the system. How effective is it, it's hards to say as time and external temperature are significant factors. I.E. Less edevyice in summer, more effective in winter. As long as your coolant mixture is correct, thhe thermostat functions properly and theq fans and sensors work properly then there should be no issues. Asema the biggest affect for keeping theengine cooler is a good oil cooling setup.