The picture attached is the feed and return for the coolant to the manifold. I have had them blocked off with bolts for awhile now when I had my stock turbo. I'm trying to figure out which one is the feed and can I take coolant from there to the turbo? I'm guessing the feed is the bolt block off by the thermostat?

 

rear plate is feed, thermostat is return

 

Is this an acceptable source to cool the turbo? Seems like it would just push hot water from the block to it.

 

Yes its usually a common source will work fine.

 

where are you going to return it might be good to return to rad for cooling

 

I was going to return it where i think the stock turbo does at the bottom water pump hose going to the radiator, on the bottom middle of the picture. The hose without the hose clamp on it. Let me know if i should not return it there. Thanks for the replies guys greatly appreciated.

 

Why not just use the original feed location for the stock twins? The rear plate nipple is point up and the hose will likely be running into other things, plus you'll have to route it around the LIM.

 

Im running an s5 13b where the stock coolant feed is on the lower intake manifold and is dangerously close to the exhaust housing and downpipe so i dont want to run from there so looking for other options. The rear feed looks like it would be okay running under the intake manifold.

 

I just ran mines from the stock twins location.

 

Again i have an s5 13b and it does not come stock with twins

 

So this is the plan to take coolant feed from the rear iron and return it back at the lower water pump in the picuture it has the letter "B". But after looking at the diagram i posted it looks as if the coolant feed would be heated up quite a lot coming through the block before it even hits the turbo and the return looks as if it will never cycle back through the radiator. Can someone knowledgeable give me some insight?

 

what,, insight into this subject AGAIN

what you propose to do has been done successfully umpteen thousand times for exactly the reason you have,, the little pipe feeding is too close to the turbo
- add to that the fact all RHD cars with retrofit 13bt have to move the turbo forward suit fitting the steering box location

the coolant is still colder than the core and will cool it .. , infact it will be marginally cooler now it has a slightly shorter path due to bypassing one alum housing

you can return the coolant to the normal OEM point at suction side of water pump
.. yes,, and i HAVE pointed it out MANY times over the years,, is kicking back through the engine and bypassing the radiator

OR

you can return it to the back of the water pump where the wax cam water previously returned
( the wax cam and BACV water previously used the return and source you have just pinched )
this will put the returning water back to the pump outlet,, and return it through the radiator

this path is also very desirable in those retrofit RHD cars,, cause moving the turbo forwards,, pinches that original return hose and keeps it very close to a glowing red turbo manifold


the trade off between the two choices to return the water is not so obvious on first glance.. the wax cam return looks favourable whilst running as all coolant passes through the radiator without a small kickback around the engine

however,, the reason for OEM spot choice becomes apparent AFTER shutdown
where there is significantly more pressure drop through the system and it will infact use passive thermal cycling to keep some small flow through the turbo as the system cools down

the coolant water was added primarily to aid in COOL DOWN AFTER SHUTDOWN.. evidence of this is plenty when you bother to look at the s4t training manual and it clearly shows you a graph displaying the difference AFTER shutdown between cooled and non cooled turbo
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so there it all is again,,, just for you,, about the 20th time i have had to type it out
next time would appreciate it if you used the search function more for the more common questions