interesting observation with water temps
Discussion
yesterday I took my car for a spin, and while driving home I went a little faster than usual and it was already a little chilly.
Funny enough my water temp probe of the dash was reading around 63 degrees when the fans kicked in (i have installed a LED in the dash)
The probe for the ECU for the LS engines is in the right head towards the back of the car close to an exhaust port and it seems that the
water in the head is heating up very quickly and the flow in the engine has its limitations. The ECU is programmed to start the fans around 80 degrees.
MY dash probe sits in the exit of the water pump, so it seems like there can be quite a difference between head temp and pump temp. Maybe the reason
why GM has been putting the probe there.
Anybody seen a similar behaviour with their LS setups ?
Funny enough my water temp probe of the dash was reading around 63 degrees when the fans kicked in (i have installed a LED in the dash)
The probe for the ECU for the LS engines is in the right head towards the back of the car close to an exhaust port and it seems that the
water in the head is heating up very quickly and the flow in the engine has its limitations. The ECU is programmed to start the fans around 80 degrees.
MY dash probe sits in the exit of the water pump, so it seems like there can be quite a difference between head temp and pump temp. Maybe the reason
why GM has been putting the probe there.
Anybody seen a similar behaviour with their LS setups ?
My first thought would be are they calibrated.
To set up MegaSquirt you give the calibration system resistance readings for three different temperatures, ambient, boiling water & freezer. You do this for both water temp and inlet air temp. With the engine off and cold you can then go into the software and check they both read the same.
Steve
To set up MegaSquirt you give the calibration system resistance readings for three different temperatures, ambient, boiling water & freezer. You do this for both water temp and inlet air temp. With the engine off and cold you can then go into the software and check they both read the same.
Steve
steve the probes are fine, it is really the difference in temps at different parts of the system. I am sure if you have an ECU
with the water temp probe in the location where I would think every LS engine has it, that after turning the engine off, the temp will climb
quickly and then actually kick in the rads when you have the ignition (ECU and fan supply) still on. The probe at the water pump will show you a different
figure as it is more or less decoupled from the heat built after turning the engine off.
I now noticed a similar fast increase and difference while driving the car hard.
with the water temp probe in the location where I would think every LS engine has it, that after turning the engine off, the temp will climb
quickly and then actually kick in the rads when you have the ignition (ECU and fan supply) still on. The probe at the water pump will show you a different
figure as it is more or less decoupled from the heat built after turning the engine off.
I now noticed a similar fast increase and difference while driving the car hard.
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