Where are you guys mounting your temp sender on your FI cars? I was reading on another thread and didnt want to hijack it to ask.... someone was asking about high water temps and another member asked if the sender was mounted in the lower hose or upper hose. I was wondering what is the best spot for the sender with the motor already in the car?

 

i think the best spot is to put it in the rear coolant pipe behind the engine if you can get in there

 

I used this to install my temp sensor in the upper radiator hose http://www.z1motorsports.com/350_g35...365&imageNum=1 Now I just have to figure out where I can mount the oil temp sensor.

 

The upper hose has coolant flowing from the engine to the radiator when the thermostat is open.

The lower hose has coolant flowing from the radiator to the engine when the thermostat is open.

The upper hose sensor placement will give a more accurate reading of the current engine coolant temperature as it flows out of the engine.

The lower hose sensor placement will give a more accurate reading of the temperature of the coolant that is flowing into the engine. Some car owners are actually more interested in the coolant temperature flowing "into" the engine vs. the coolant temperature flowing "out" of the engine. That's why you see some variation in regards to the placement of the sensor from one car to the next.

When comparing coolant temps from one car to another, its important to know where the sensor is located.

 

I believe the upper and lower coolant hoses do not have constant flow only when the thermostat opens, I have mine on the hard pipe running along the passenger side of the engine

 

Good point.

 

Excellent guys!!! Thanks so much. I am gonna put it in the upper hose, cause I care more about the heat in the motor.

 

The upper has constant coolant in it...so I usually put the sensor somewhere prior to that hose, including the hardpipe that Westpak mentioned. The OEM sensor is located on the cast aluminum bridge pipe in between the two cylinder heads.

 

How can the hard pipe not have constant flow when the upper hose is connected to the hard pipe? If the hose doesnt have constant flow, the pipe isnt going to either, right?

Plus the water pump is always turning, so there should be constant circulation throughout the motor and into the radiator.

 

What about oil temp sensors? Are the sandwich plates OK to use for this? If so, are there any brand that are 'better' than others?

 

The hardpipe has constant flow because there is a hose connected at the front of it that flows to the driver's side of the block, the upper hose connected to it and the radiator doesn't flow unless the thermostat is open. It is probably close enough to that it will probably read accurately but I am picky and wanted the sensor to always have coolant flowing past it for accurate temps, and it is pretty much dead on with the ECU readings.

Coolant doesn't flow through the radiator all the time, only when the thermostat opens up, that is how the engine is kept cool, the coolant stays in the radiator cooling down from airflow and when the thermostat opens up the cooler coolant from the radiator goes into the engine

 

Hey Sharif,

Do the standalone EMS's (FCON, Haltech) get their coolant temperature readings from the OEM sensor ?

 

Put the oil temp sensor in your oil pan or spacer if you have one.

 

Fcon does

 

That is where i have mine, on the JWT oil pan spacer

 

I've been trying to figure out where I can mount my oil temp sensor. I'm having my APS TT installed next week. So I cant put it on the pan and there is no room by the oil pressure switch for a tee. I'm hoping once the motor is pulled we'll be able to find a place for it.

 

When my APS-TT was installed, the shop drilled & tapped a hole into the APS oil pan for the oil temp sensor. They put it on the side of the pan.

While they were drilling new holes into the pan, they also put in a heli-coil in the same place as the existing drain plug. Some APS oil pan owners have had a problem with the APS drain plug stipping if it is over tightened. Usually not a problem if you DIY oil changes and are careful.

In the pic, the sensor is located right under the oil filter.

 

+1 that's where mine is too.

 

If you do not have a spacer use a sandwich plate I did and it works fine.

 

Again, thanks guys. I can't get to the hardpipe while the engine is in the car, so I am just gonna put it in the upper hose. I mainly want it for emergency uses anyways... not for precise readings.