GTD/SB auxiliary water pump for turbo

[mk1vdub]

The GTD engine (SB code) which I am using in my Rabbit has an auxiliary  water pump (shown in red in the first pic) which pumps water to the turbo (shown in red in the second pic)
do any of you guys have this? and can you tell me if is is on constantly when the engine is running, or if it is thermostatically controlled like the rad fan?
if it is heat sensitive does it get its reading from the sensor on the top of the turbo (shown in yellow in the second pic) if not does anyone know what this sensor does?





basically I need to know if I can just hard wire it into ignition live ie. to come on and stay on when the engine is switched on, or if I need to mess around with the old engine loom and wire with its nessecary sensors etc.

Cheers
Paul

[jtanguay]

My guess is that the pump is thermostatically controlled.  Why waste energy on a really cold day?  

[lord_verminaard]

Interesting.  The VR6 engines have those too.  Sometimes they run after the car is shut off.  They even look pretty close to the same!  I'm not real sure when or how they work, although I know an extra smaller radiator is involved somewhere.  If this one just pumps water to the turbo, then perhaps it just operates when the housing or oil temp in the turbo gets to a certian point.  I dont see any problem with running it all the time, other than maybe wearing it out too fast.

Brendan
84 Scirocco 8v
00 Camaro L36 M49

[mk1vdub]

yeah I did think about just running it all the time , I also considered wiring it in with the ran fan switch, as that comes on at a certain temperature, I'm just not sure if the turbo may have got too hot by then as the fan doesn't kick in till the temps pretty high...

[VWRacer]

Heck, I'll bet it was designed to run all the time anyway. You really can't over-cool a turbo case -- it's not like pistons which swell up to fit...

I'd just sent switched 12vdc to it and forget it.

[Dr. Diesel]

i'd imagine that it's an after run feature. most likely, the engine's coolant pump moves fluid through the turbo cartridge, and after shutdown, that electric pump takes over until that little sensor says everything is cool. (literally)

[caddy]

it is thermostatically controlled like the rad fan?
if it is heat sensitive does it get its reading from the sensor on the top of the turbo (shown in yellow in the second pic)
l

that wright! :wink:

you must connect this circuit to the permanent 12v
usualy this pump turn on for cooling the turbo after  turn off  the engine.
because when the engine runing the turbo is cooling by the oil.

[dieselpower]

it is thermostatically controlled like the rad fan?
if it is heat sensitive does it get its reading from the sensor on the top of the turbo (shown in yellow in the second pic)
l

that wright! :wink:

you must connect this circuit to the permanent 12v
usualy this pump turn on for cooling the turbo after  turn off  the engine.
because when the engine runing the turbo is cooling by the oil.

so is that how most water cooled turbos are? the turbos off the 2.2L?? chryslers are all water cooled so noone takes then in the junkyards. if it gets cooled by the oil then ill just have to make a turbo timer for it or sumthing cuz thats a bit bigger of a turbo for me and it wouldnt be all that hard to get one.

[steel-jaw-sasha]

the electric water pump runs after the engine is switched off to create a water flow around the engine to prevent hot spots. it will run util the temperature drops to a safe level, sorry can't tell you where the temp sensor is located.

[veeman]

Yep... afterrun pump.  The 5-cyl turbo Audi's had them as well (5k turbo MC motor).  They were triggered to run when engine temps got to a certain level and circulated coolant through the engine / turbo even after the engine's water pump had stopped...  Good reassurance that things aren't absolutely frying in the engine bay after a good run...

Didn't know the diesels had them as well.

[autobahn]

[jack] is there any problem with putting a 'time delay off' switch on my oil pump in my 1.9L td so it will run __sec after i shut down my car? i don't think there's any stock after-run cooling for my turbo, right? [/jack]

[QuickTD]

is there any problem with putting a 'time delay off' switch on my oil pump in my 1.9L td so it will run __sec after i shut down my car? i don't think there's any stock after-run cooling for my turbo, right?

 The oil pump in your engine is mechanically driven by the crankshaft, it is not electric. It can only turn when the engine is turning. Your turbo will be fine, just don't pull in off the highway and immediately shut it down. Drive at moderate throttle or idle for a few minutes prior to shutting it down if you've been driving hard.

[JimK]

I use the 300 deg rule on my Cummins. The probe is after the turbo which is not the best. I had a 2lt turbo diesel 4x4 toyato that I bought new and now my son drives it. The turbo is water cooled on the toyato. I have yet to have any problems with the turbo on the cummins and I have barked it several times at 32 lb.   I alway let my turbo cool down and dont stand on the throttle when I start the engine.  good luck JimK

[Baxter]

All UK TD VW's have the auxilliary water pump.
On a T3 (Vanagon) there is an extra coolant temerature sender on the cylinder head, it's contacts close at 104*c and supplies an earth to a relay in he engine compartment, this energises the relay and clicks on the auxilliary water pump.
I should imagine it's the same system for the rest of the VW's, my specialit subject if ever I went on mastermind is T3's! but VW being VW it will be the same for the rest im sure.
I may have the circuit diagram for a T3 if thats any use?

[Baxter]

It should be a white sender, it comes on at 115*c, I just checked ETKA.
Part number should be
191 919 521 C
Single pin.

Try this, it's for a T3 but still relevent.

http://www.soundstore-online.de/vw-bus-tuning/info/t3-stromlaufplaene/diesel-vorglueh.gif