Plumbing a watercooled wastegate on a WBX

[fastback]

have a Tial wastegate that is going in my car these days.
the Wastegate has two ports for watercooling.
i was thinking to get the water by a T-piece from the hose that goes to the oilcooler and return the water to the original return system that connects all the small hoses and returns to the tank.

[tencentlife]

With the 2.1 water pump, that's your available takeoff point for coolant flow, it's direct off the pump impeller. It's not as cool as it would be upstream of where the pressure tank hose cuts in, because that has the purge ring fluid in it and that stuff is hot off the heads; by dumping the wastegate flow into the purge ring as you suggest the purge ring flow would be that much hotter. Of course the coolest fluid is above the thermostat, the return hose from the radiator. But each of those locations would require a separate pump for guaranteed flow thru your wastegate loop. At the temps a wastegate would be running at, you would have a big temp differential no matter where you sampled coolant from, and the outlet right off the pump has the pressure and flow you need right there without having to add a pump to guarantee circulation.

It's safe to assume that you will have external controlled oil cooling, right? So in that case, you could omit the oil/water hx pod and use all the pump outlet flow for your turbo and/or wastegate. Or you could keep the pod for faster oil warmup. If you took the flow for the wastegate after the pod you would warm up the turbo and wastegate faster, but those don't need heat added like the engine oil does, they will warm up fast on their own. You could return their coolant flow thru the pod, but that will put more heat into the oil for even faster warmup, but consequently your external oil cooler would have to be able to dump that once full temp is reached.

If you teed into the pump outlet, you could have both flow thru the pod for faster oil warmup, and dump the flow that goes thru the turbo/wastegate into the coolant manifold off cyl. #1, so it goes straight to the radiator instead of being cut back into the engine loop where the pod output normally goes.

[fastback]

thx Tencent!
finally got the wastegate and done some work.
I T'eed the hose to the oilcooler and did the return in the original small return tubes .
I have no external oil cooler.
run's without thermostat on the water , and with hard trackdriving i had max around 117° on the oil
the oilcooler also acts like a oil heater up to the water temp.

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[Steve Arndt]

Do you have any pictures you can share of your turbo location and exhaust routing?
Steve

[fastback]

here's a couple of pic's from the build.
the flanges on the header has gone due to leak's

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[fastback]

did some testing yesterday and with the tee-connection on the hose for the oilcooler, the flow through the wastegate was close to zero.i suspect to small ID in the wastegate fittings etc.
so i dumped the tee,hooked the oil cooler back to normal and took the wastewater from the left cyl head (rear output , closest to the waterpump) and routed through the wategate.
plenty of flow then, though the wastegate gets a bit warmer water.