Was a "continued coolant function pump" AKA electric coolant pump similar to one on the S4
07-27-2005, 12:12 PM
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Was a "continued coolant function pump" AKA electric coolant pump similar to one on the S4
ever tried on the A4? IIRC Saabs had similar setup (or at least that's how I remember it from reading my 9000CD manual some years ago).
Wouldn't such a pump be a good alternative to a turbo timer? I do realise that one just pumps coolant and the other one pumps both coolant and oil (engine running).
Unless, of course, it doesn't help much in the S4s and that's why their turbos fail often...
Wouldn't such a pump be a good alternative to a turbo timer? I do realise that one just pumps coolant and the other one pumps both coolant and oil (engine running).
Unless, of course, it doesn't help much in the S4s and that's why their turbos fail often...
07-27-2005, 12:40 PM
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Do you know if the TT's system is the same as the S4s? On the S4 that pump
pulls coolant through the heads and into the turbos in the direction opposite to the "normal" flow. That system is def not simple.
Curious how it's done on the TT...
Curious how it's done on the TT...
07-27-2005, 12:55 PM
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The TT's system is the same as the transverse VWs...
The coolant pump runs EVERY time the car is shut down (even if you just start the engine and then shut it off).
On the S4, its a bit more complex. There's a fan controller and a temperature sensor in the coolant return line. If coolant temps are above the sensor threshold anytime within 10 minutes of shutdown, the fan controller will trigger the afterrun pump and electric fan on a low speed to run until the coolant temps are below the switch threshold or 10 minutes has elapsed (whichever comes first).
However, the stock thermoswitch on the S4 is set pretty high (very rarely engages the afterrun system). So many S4 owners have swapped in a lower temp VW thermoswitch.
-Dave Pramanik
On the S4, its a bit more complex. There's a fan controller and a temperature sensor in the coolant return line. If coolant temps are above the sensor threshold anytime within 10 minutes of shutdown, the fan controller will trigger the afterrun pump and electric fan on a low speed to run until the coolant temps are below the switch threshold or 10 minutes has elapsed (whichever comes first).
However, the stock thermoswitch on the S4 is set pretty high (very rarely engages the afterrun system). So many S4 owners have swapped in a lower temp VW thermoswitch.
-Dave Pramanik
07-27-2005, 02:26 PM
#7
here.
like i said earlier, i researched the afterrun circuits on the TT and S4 extensively...
for what reason i dont know
i even have a S4 fan control module sitting here next to me....hmmm.<ul><li><a href="http://www.modifieda4.com/web/archive/SSP%20207%20-%20Audi%20TT%20(english)%20(partial)%20(afterrun%2 0pages).pdf">tt afterrun circuit factory training pages</a></li></ul>
for what reason i dont know
i even have a S4 fan control module sitting here next to me....hmmm.<ul><li><a href="http://www.modifieda4.com/web/archive/SSP%20207%20-%20Audi%20TT%20(english)%20(partial)%20(afterrun%2 0pages).pdf">tt afterrun circuit factory training pages</a></li></ul>
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07-27-2005, 03:21 PM
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Thanks. I also found QCRAZY's thermo-switch mod
But I wonder if he'd achieve more dramatic results has he run the car harder during his tests.<ul><li><a href="https://forums.audiworld.com/s4/msgs/1629709.phtml">click</a></li></ul>
07-27-2005, 03:24 PM
#9
have you read this?
<a href="http://www.modifieda4.com/web/archive/SSP%20198%20-%20Audi%20S4%20Engine%20(english).pdf">s4 engine pdf</a>
btw, i helped develop the s4 afterrun mod with qcrazy
btw, i helped develop the s4 afterrun mod with qcrazy
07-27-2005, 03:37 PM
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Yes, and that's what got me thinking. Prior to this I had no idea such system
is utilized in S4.
Now, if it's indeed a worthy mod then why not to make a simple system operated by a thermo-switch? Any switch.
Also, why not to route the after-pump flow through the radiator? Will it not have enough power (wonder why on S4 they didn't do it - it seems to be pumping just through the block)
Looking at the A4 cooling diagram now...
Now, if it's indeed a worthy mod then why not to make a simple system operated by a thermo-switch? Any switch.
Also, why not to route the after-pump flow through the radiator? Will it not have enough power (wonder why on S4 they didn't do it - it seems to be pumping just through the block)
Looking at the A4 cooling diagram now...