Oem supercharger coolant pump question

[hckymstr19]

Does anyone know exactly when the supercharger coolant pump turns on, under what conditions? I have heard 20% throttle, but is that only at certain times? Let me know. Thanks

[Loe]

There is a 3.0T .pdf floating around somewhere and one of the items addressed was the coolant loop. IIRC one of the requirements were IAT's at least 50c before it will cycle on.

[ellwood]

According to the 3.0t self study, the supercharger coolant pump is activated according to the temp and pressure downstream of the intercooler. Pump turns on at a pressure of 1300 mbar or coolant temp of 122F (50C).

[Ray Khan]

I would reach out to Tony as each tuner might make adjustments to this feature.

[hckymstr19]

OK, yea I'll see what Tony says. I wish vcds worked like other 3rd party ecu access. Like I remember my old car the tuning software allowed me to basically turn on any fan or pump whenever I wanted, and I kno my dad's BMW jb4 allows him to turn on coolant fans and what not. I know vcds can test somethings but it's really limited in terms of specificity of being able to control certain things. If that makes sense.

[infinkc]

OK, yea I'll see what Tony says. I wish vcds worked like other 3rd party ecu access. Like I remember my old car the tuning software allowed me to basically turn on any fan or pump whenever I wanted, and I kno my dad's BMW jb4 allows him to turn on coolant fans and what not. I know vcds can test somethings but it's really limited in terms of specificity of being able to control certain things. If that makes sense.

from another post, it was said that if you tie the 12v and signal line together the pump will turn on. No one has tried it yet.

[cspcrx]

I thought it came on when the door opens.

[whiped]

I thought it came on when the door opens.

Some of the aftermarket ones do. OEM does not.

[cspcrx]

my AMS Alpha should be here soon, I will have to listen for it.

[xpoweruk]

The pump is activated according to the temperature and
pressure downstream of the intercooler, both of which
are read from a map stored in the engine control module.
The pump begins to run at a pressure of 1300 mbar or a
coolant temperature of 122 °F (50 °C).

The below is a possible work around for the OE pump

If the signal line to the pump is broken or if a short circuit
to positive occurs in the signal line, the pump will enter
an emergency mode delivering 100 % output. If a short
circuit to ground occurs on the signal line, the pump will
stop.

[hckymstr19]

The pump is activated according to the temperature and
pressure downstream of the intercooler, both of which
are read from a map stored in the engine control module.
The pump begins to run at a pressure of 1300 mbar or a
coolant temperature of 122 °F (50 °C).

The below is a possible work around for the OE pump

If the signal line to the pump is broken or if a short circuit
to positive occurs in the signal line, the pump will enter
an emergency mode delivering 100 % output. If a short
circuit to ground occurs on the signal line, the pump will
stop.

OK so I'm not the most electrically inclined, but is there a way I could set something up so when I'm at the track I can have something I activate or wires it put together to create that emergency mode?

[cspcrx]

If it is a single sensor, only signal wires, unplugging it might do it.

[hckymstr19]

Unplugging the sensor? From what I understand from xpoweruk, I just need to run a 12v wire to the signal line of the pump and it will trigger it to turn on? So I could run a 12v switch from the cabin to the signal line? Would that work?

[cspcrx]

"If the signal line to the pump is broken or if a short circuit to positive occurs in the signal line"

The way I read that means the signal wire can be unplugged with the same result and not have to run wires. I have not done this or seen the harness just basing it on what was said above.

[hckymstr19]

OK I see what your saying, yea I'll do some testing this weekend see what I can find out. If I can find away to have the car off in the staging lanes but still be able to have coolant flowing through the supercharger circuit and air flowing across and cooling down that circuit, then that's the most ideal situation for the track.

[Loe]

Unplugging the sensor? From what I understand from xpoweruk, I just need to run a 12v wire to the signal line of the pump and it will trigger it to turn on? So I could run a 12v switch from the cabin to the signal line? Would that work?

In theory, it should turn on whenever the ecu wakes up: unlocking/locking, opening/closing doors, when the engine is on, and more.

[infinkc]

Unplugging the sensor? From what I understand from xpoweruk, I just need to run a 12v wire to the signal line of the pump and it will trigger it to turn on? So I could run a 12v switch from the cabin to the signal line? Would that work?

It's not the sensor but the wire going to the pump. There are 3 wires at the pump, 12v, ground and signal. Either cut the signal wire or connect the 12v and signal together should do the trick. This will make the pump operate the same way as the awe/ams where when you open the door or have ignition on, the pump will be on.

[lowjonathan]

It's not the sensor but the wire going to the pump. There are 3 wires at the pump, 12v, ground and signal. Either cut the signal wire or connect the 12v and signal together should do the trick. This will make the pump operate the same way as the awe/ams where when you open the door or have ignition on, the pump will be on.

does this method will overwork the stock pump?

looking at the jabsco 2 wire..red and black...

12v and signal goes to red and black to black will turn it on per the awe/ams?

[amz]

I thought it came on when the door opens.

That's the fuel pump priming the fuel rails for ignition. If you leave your door open long enough you'll hear it keep re-priming as pressure dissipates.

[hckymstr19]

does this method will overwork the stock pump?

looking at the jabsco 2 wire..red and black...

12v and signal goes to red and black to black will turn it on per the awe/ams?

Well thats why I want to wire it to a switch. I want it to operate like oem everywhere but at the track. When im in the staging lanes, I want the car engine to be off but have coolant circulating through the supercharge circuit only and have the fans on cooling that circuit down while I wait (I plan to divorce the system). I feel this is the best scenario for the track.

[Woodybangs]

If there is room you could add a pull fan to the aftermarket coolers. This along with a trunk tank and an additional pump would help a ton with IAT's and keeping things cool at the track.

[Hofahome]

Well thats why I want to wire it to a switch. I want it to operate like oem everywhere but at the track. When im in the staging lanes, I want the car engine to be off but have coolant circulating through the supercharge circuit only and have the fans on cooling that circuit down while I wait (I plan to divorce the system). I feel this is the best scenario for the track.

With my setup I found that running the coolant with the engine off is not super effective (drops IAT at startup from 150 to 140). Obviously this is due to lack of passing air. Adding a fan would definately help although you might do a lot better with adding ice instead since you are only using it at the track. Maybe get a C02 sprayer, which are cheap. Heck I might do that....

[cspcrx]

I do something like this on my CRX for the cooling fan, simpler system though. I have a switch and relay connected to the thermo sensor at the bottom of the radiator. I can manually turn the fan on any time I want with the flip of a switch. It is just seeing ground when the relay trips.

I do not see why you could not do the same thing but make it see 12v.

[infinkc]

I was going to add one of these fans to the cooler in the driver wheel well on the b8 https://www.amazon.com/Spal-30103011.../dp/B009OBP0Z6

[cspcrx]

Is there room to put it behind it?

[hckymstr19]

With my setup I found that running the coolant with the engine off is not super effective (drops IAT at startup from 150 to 140). Obviously this is due to lack of passing air. Adding a fan would definately help although you might do a lot better with adding ice instead since you are only using it at the track. Maybe get a C02 sprayer, which are cheap. Heck I might do that....

Hey hofahome, I actually just got the same heat exchanger you did, if you mount it as far forward as possible, is there enough room to fit an aftermarket slim fan behind it or no?

[B8S4OZ]

Hey I've been wondering wiht the larger heat exchange kits, some have upgraded pumps that say they give you "100% gain in flow-rate over the factory pump". If that is true (and I don't doubt it as I have knowledge on pumps etc) does that mean more pressure also?