hi, what did you guys do with the watercooling system of the turbo on the ej20? the radiator is up front, and so is the burp tank, and filler. id rather not have a 2nd filler in back and burp tank. im talking about the black plastic one that bolts to the intake manifold. Can i just block both ends, ie the one at the block, and the one at the waterpump? i doubt ill need the watercooling of the turbo.

any help greatly appreciated.
-Ryan

Why would you "doubt" youll need watercooling of the turbo?
Watercooled turbos are designed to run....well watercooled.
L8tr
E

You will have to move that filler tank as it will hit the engine bay in a bug. Unless you have your radiator higher than the back of the motor...you tank and filler will be at the highest point..the back. I Just have a turn valve bleeder on my radiator in case some air gets trapped. You cannot just block off watercooling pipes. The turbo water needs to drain back somewhere. There is also an expansion bottle off the filler/tank to take the expanding volume and allow air to escape.

Matt

i thought of that, but after reading how the watercooling of the turbo works, it dosnt constantly run water through it, that would seem pointless. it actually only pulls water through it when the engine is shut off, so you dont need to let it idle or get a turbo timer. alot of the wrx guys upgrade to t3/t4 turbos and they dont have watercooling.

im pretty sure my radiator up front, with the filler, is the highest point in the water system.

alright, so lets say i do put the watercooling back on. do i have to raise that little black coolant tank so that the cap is the same height from the ground as the front radiator cap?

If your radiator sits in the bottom of the wheel well, shouldnt it be lower than the fill tank. Most of us have no filler cap at the front, only at the rear. If you have a cap at the front just keep them both...have the lowest one as a non pressure release cap with the expansion tank next to the high one.....

There must be some benefit in maintaining the watercooled turbo, otherwise Subaru wouldnt use them on the race cars. The sti turbos are watercooled also, and I thought they had constant water flow.
Matt

I've had the radiator cap off whilst the engine is running, at the time the level was low in the tank and I could see a flow from the turbo into the tank. I would expect to see a flow only when the engine is running.
You could run an uncooled turbo, but you might have to pay attention to the way you go about your cooldown.

Well theres an interesting take on things. Evidently, im not too old to be told something.......
Where does this particular bit of advertising actually appear?
L8tr
E

Is there any advantage in the coolant system if the burp tank is near the engine vs all the way in front of the car next to the radiator?

Thanks alot,
-Ryan

ya, im a newbie when it comes to watercooling, ive grown up with aircooled, and i guess its just an instinct of mine to make things simpler or less complex, because of the overall simplicity of the vw engine.

the turbo will stay watercooled. i will hook up the stock black tank that the turbo goes to, and from there hook up a burp tank setup. the radiator up front will have no burp tank.

i am assuming that it doesnt matter that my front radiator is higher than the coolant reservior/burp tank in the back because the whole system is under pressure correct? As long as it is higher than the engine. but correct me if im wrong.....

thanks a bunch guys,
-Ryan

alls good as long as your point of fill isthe highest point of the complete system