Water cooled turbo plumbing

[mayoturbo]

I need to plumb the watercooling in on the turbo for the GTM. Turbo is IHI RHF4 BB type from a legacy GTB

In the standard car the feed is from the hot side of the radiator and drains into the cold water entering the engine. I think this may be so it syphons after shut down and the turbo is mounted too high to be fed from the cold side.

On the GTM I have the turbo mounted lower so could feed from the cold side of the radiator and drain into the hot side.

Or is it suppose to be fed by the hot side as the water needs to be warm to stop the turbo from suffering thermal shock?

Thanks

[matty2300]

its fed from top of the engine and drains near to where the cold water enters the engine because this is the way the water pump causes the circuit to flow

the water pump draws cold water in from the bottom of the rad (suction at this end) which exits hot at the top of the engine (pressure at this end)

if you plumbed it in the other way round it would still flow in the same direction from hot to cold!

The only ways to change this would be to plumb in a feed from the "pressure" side of the water pump sufficiently close to the pump that the water was still reasonably cool or for the turbo to have its own independant water pump...

[mayoturbo]

My car is running an electric waterpump which is mounted at the front and now pushing water through the rad from the top (its mid engined)

I should be ok to run from the cold side then?

[hario]

There is such a small temperature diffference between the 'hot' side and the 'cold' side of a coolant radiator that it really doesn't matter which way you pipe the system. The delta may be 5 degrees celcius between the two, it's the volume flow of water that has an effect on removing heat. Ergo: whichever way is easiest & simplest to pipe.

My thoughts would be to perhaps fit an auxiliary coolant circulation pump in series with the turbo core coolant pipework to avoid coolant boiling in the core after a hot shutdown. Now I think about it perhaps it is this reason your turbo pipework feeds directly to the top of the radiator where air normally collects (to remove air bubbles which form after a hot shutdown). Hmm...