S4 B8 OE coolant pump 100% duty cycle

[xpoweruk]

I did this mod today,very easy if you dont want it switched as it only requires the cutting of 1 wire.
The wire is Yellow/blue on my 2010 & according to the below it is the same on a 14 (thanks to @beans912 for the diagram )



The wire is located in the wiring shown being held in the below pic




The pump runs at 100% constantly once the the engine is running ,but slows to a much slower rate when the engine is off & ignition is on.
The pump stops completely about 20 seconds after removing the key from the ignition

I did some logs today & the temps didn't go over 63c & that was @ 6300rpm in 5th gear
The outside temp was 23.5c

Log is here https://www.dropbox.com/s/gbronxl9kw..._%266.CSV?dl=0

[SwankP3RF3ct10n]

What were the temps before, while taking outside temp into consideration? Did you do logs of it stock and then cut and then log again, preferably around the same time on the same day? BTW, it probably would have been better (so you could put it back to stock) if you had unplugged the harness plug off the pump and then just pulled the wire pin out of the plug and electrical taping it to the harness out of the way and sealed from the environment. Just a thought for those thinking of doing this mod.

[scottycs]

good stuff!

[xpoweruk]

I have logs from a different day,

Pre pump mod
outside temps were 20c https://www.dropbox.com/s/jjkyiscbz3...-4191.CSV?dl=0
3rd gear 2000rpm to 6900 rpm
start temp 37.5c finish temp 48.75c

Post pump mod
Today,outside 23.5c
3rd gear 2000rpm to 6900rpm
start temp 38.25c finish temp 37.5c
into 4th gear 4500rpm to 6900rpm
start temp 38.25c finish temp 43.5c


I should add that I have put connector on the cut wire in case I wish to put it back

[RLB6]

I have logs from a different day,

Pre pump mod
outside temps were 20c https://www.dropbox.com/s/jjkyiscbz3...-4191.CSV?dl=0
3rd gear 2000rpm to 6900 rpm
start temp 37.5c finish temp 48.75c

Post pump mod
Today,outside 23.5c
3rd gear 2000rpm to 6900rpm
start temp 38.25c finish temp 37.5c
into 4th gear 4500rpm to 6900rpm
start temp 38.25c finish temp 43.5c


I should add that I have put connector on the cut wire in case I wish to put it back

Good stuff. However, this would shorten the pumps lifespan. It's costs of modding

[jimrobbington]

Very interesting. I would want to add a switch so that it only runs full time when I want it to

[xpoweruk]

I dont mind shortening the pumps lifespan,good excuse to upgrade then

[hckymstr19]

I guess I dont understand your first post. You said when the engine is on its at 100%, and when the engine AND ignition are on it slows? Please explain this a little bit to me because when the engine is on isnt the ignition on? Im a little confused. Does it run when the engine is off and accessory mode on? And what did you do with that wire exaclty, just cut it and add connectors? Did this cause a code of any kind. Let me know ASAP. Looking to hit the track today and would really like to do this, temps outside are a non favorable 90.

[whiped]

I guess I dont understand your first post. You said when the engine is on its at 100%, and when the engine AND ignition are on it slows? Please explain this a little bit to me because when the engine is on isnt the ignition on? Im a little confused. Does it run when the engine is off and accessory mode on? And what did you do with that wire exaclty, just cut it and add connectors? Did this cause a code of any kind. Let me know ASAP. Looking to hit the track today and would really like to do this, temps outside are a non favorable 90.

Not sure on the first question but to the second:

If you cut the wire or short it to positive it will run the pump in "emergency mode" which is 100%.

He just added the connectors so he could restore normal functionality later.

If you are going to the track I would absolutely cut it

xpoweruk is not the first to do this mod.

[hckymstr19]

Not sure on the first question but to the second:

If you cut the wire or short it to positive it will run the pump in "emergency mode" which is 100%.

He just added the connectors so he could restore normal functionality later.

If you are going to the track I would absolutely cut it

xpoweruk is not the first to do this mod.

Does it throw a code just cutting the wire?

[whiped]

I'm not sure... I know it does if you unplug the pump completely

[xpoweruk]

I guess I dont understand your first post. You said when the engine is on its at 100%, and when the engine AND ignition are on it slows? Please explain this a little bit to me because when the engine is on isnt the ignition on? Im a little confused. Does it run when the engine is off and accessory mode on? And what did you do with that wire exaclty, just cut it and add connectors? Did this cause a code of any kind. Let me know ASAP. Looking to hit the track today and would really like to do this, temps outside are a non favorable 90.

It should of read
The pump runs at 100% constantly once the the engine is running ,but slows to a much slower rate when the engine is off & ignition is on.
The pump stops completely about 20 seconds after removing the key from the ignition


It does throw a code,but it's a soft code so no MIL is thrown


1 Fault Found:
7814 - Coolant Pump for Intercooler
P190C 00 [039] - No Signal
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 4
Mileage: 90823 km
Date: 2016.08.05
Time: 15:31:53

[hckymstr19]

It should of read
The pump runs at 100% constantly once the the engine is running ,but slows to a much slower rate when the engine is off & ignition is on.
The pump stops completely about 20 seconds after removing the key from the ignition


It does throw a code,but it's a soft code so no MIL is thrown


1 Fault Found:
7814 - Coolant Pump for Intercooler
P190C 00 [039] - No Signal
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 4
Mileage: 90823 km
Date: 2016.08.05
Time: 15:31:53

Perfect! that is exactly what I wanted to know, and it does run with the engine off and ignition on. Awesome Thanks alot? Doing this as soon as I get out of work. And to make sure, all you did was cut that yellow/blue wire?

[cspcrx]

Awesome. Proof of some of the discussion in my thread on the pump supposedly not working.

Great job on being willing to try it. Like others have said may be a great way to address heat when at the track and waiting in staging lanes.

[xpoweruk]

I unplugged the connector first as it gives you room to pull the wire up,but yes I just cut the Yellow/blue wire
I have attached a connector to each wire in case I want to go back to OE

[hckymstr19]

Awesome. Proof of some of the discussion in my thread on the pump supposedly not working.

Great job on being willing to try it. Like others have said may be a great way to address heat when at the track and waiting in staging lanes.

That is my thought exactly, with that added heat exchanger and the two 9" fans I have behind them wired to a switch, if i can have the engine off in the staging lanes and the fans on and coolant pumping through there, that sounds like the best scenario to combat heat at the track!

[whiped]

That is my thought exactly, with that added heat exchanger and the two 9" fans I have behind them wired to a switch, if i can have the engine off in the staging lanes and the fans on and coolant pumping through there, that sounds like the best scenario to combat heat at the track!

Be sure to post your times man! Haven't seen much coming out of the EPL camp.

[RLB6]

I dont mind shortening the pumps lifespan,good excuse to upgrade then

Nothing wrong with that.

[Tom/APR]

Be forewarned, a new OEM pump retails for $556, and there are not many aftermarket pumps that outflow it. It is PWM controlled from the engine computer so it does not have to run at 100% all the time, and was not designed to do so...

[whiped]

Be forewarned, a new OEM pump retails for $556, and there are not many aftermarket pumps that outflow it. It is PWM controlled from the engine computer so it does not have to run at 100% all the time, and was not designed to do so...

Thanks for the info Tom.

Just for documentation here are some other pump options:

switch out to an aftermarket one and wire it as above but the green wire to 12v of the aftermarket pump.

Pump APR uses: Jabsco
https://www.amazon.com/Jabsco-50840-...=1&*entries*=0

Pump AMS uses: Varimax
https://www.summitracing.com/parts/l...x4AaApnz8P8HAQ

Pump AWE uses: Meziere'
http://www.jegs.com/i/Meziere/680/WP...rentProductId=

I believe the Varimax (AMS one) flows the best.

[cspcrx]

I think if you just use it as a track option it makes sense. You can separate the wires at the track and get the advantage of the extra cooling. Before you leave plug it back in and functions as normal. Makes sense to me.

[Jflow23]

Any codes?

[cspcrx]

I believe he showed he was. This is what I was told by the dealer as well.

[14S4GWM]

Any codes?

9 posts up

[fitzydude]

Has anyone done this with the AMS system installed? I am considering this mod with a switch in my dash.

[DGVR6]

Basically, the pump is now running on emergency mode ..
Is there anyway to disconnect it rather than cutting it?

[jlaudio]

Basically, the pump is now running on emergency mode ..
Is there anyway to disconnect it rather than cutting it?

here:

I unplugged the connector first as it gives you room to pull the wire up,but yes I just cut the Yellow/blue wire
I have attached a connector to each wire in case I want to go back to OE

he is saying you can put quick disconnect connectors on the wires. heres a few:

https://www.waytekwire.com/products/...k-Disconnects/

[DGVR6]

here:



he is saying you can put quick disconnect connectors on the wires. heres a few:

https://www.waytekwire.com/products/...k-Disconnects/

Ahh ok I see.. That's pretty neat.

Sounds like a good option to disconnect while at the track and reconnecting once you're done.

[Pawan2013]

Is there a separate pump for the supercharger and the rest of the engine or is it all one loop with one pump?

[xpoweruk]

Just for info,I believe the OE pump is rated at 50 l/m or 3000 l/hr

[RyanJon]

It would be good to solder a toggle switch into the circuit and hide it out of the way to engage it as and when required

[Loe]

Thanks for doing this for everyone!

[waxxonMTL]

Thanks for the info Tom.

Just for documentation here are some other pump options:

oh lord.. so many choice haha!! have you done any research regarding these pumps as the one that is the quieter/flow more/durability/warranty/reputation of brand etc. ? I will need to have some read on the different system, seems like the awe/ams is pretty popular.

[cspcrx]

Is there a separate pump for the supercharger and the rest of the engine or is it all one loop with one pump?

Supercharger loop has its own electrical pump. Main cooling system uses the primary water pump to circulate the coolant

[Moloki]

Yellow/blue wire right? Lol just making sure I didn't cut the wrong wire, as these do go right with the ignition coils.

Sent from my XT1254 using Tapatalk

[14S4GWM]

^ Those two connectors don't go together.

[xpoweruk]

That's the one on my 2010 & the same on the 2014 diagram

Easy enough to check.
Turn the steering on full lock to the right & undo the 2 screws that hold the left arch liner at the bottom & top to the bumper.Fold the liner out of the way & the pump is exposed :)

[SwankP3RF3ct10n]

^ Those two connectors don't go together.

lol. I thought I was the only one who thought that, but then I saw blue wire loom and green duct tape, so I was like . hahaha

[xpoweruk]

Deffo wrong connector for :)

[BG SQ5]

Supercharger loop has its own electrical pump. Main cooling system uses the primary water pump to circulate the coolant

So do we know which one is on when, and is there a way to log these in VCDS? I assume the s/c one runs 100% all of the time?