Throttle body coolant line sender discussion
#1
Throttle body coolant line sender discussion
The weather has been particularly cool in the late evenings here on the central coast of Ca. lately. We normally have pretty mild weather year round. Lately, late evening temps have dropped into the upper 30's on a regular basis.
I have my coolant temp sender in my throttle body coolant line. Lately, when driving at night on the freeway, my coolant temps are staying at about 170. I'm not boosting the car, just cruising home on fairly flat roads for about 15 miles. I believe that my temp gauge is working properly because it gives me the readings I expect during warm up, and around town. I'm thinking that the cold air temps are keeping the TB pretty cold, and that the cool TB may be dropping the temp of the coolant before it reaches my sender.
I don't have a way to measure intake temps. I'm wondering what intake temps would generally be when cruising down the freeway on a 35 degree night, with no boost (or heat soak), and coolant temps of 180. If intake temps are close to ambient, would they cool the TB enough to effect my sender?
Helpful comments appreciated
Thanks, Adam
I have my coolant temp sender in my throttle body coolant line. Lately, when driving at night on the freeway, my coolant temps are staying at about 170. I'm not boosting the car, just cruising home on fairly flat roads for about 15 miles. I believe that my temp gauge is working properly because it gives me the readings I expect during warm up, and around town. I'm thinking that the cold air temps are keeping the TB pretty cold, and that the cool TB may be dropping the temp of the coolant before it reaches my sender.
I don't have a way to measure intake temps. I'm wondering what intake temps would generally be when cruising down the freeway on a 35 degree night, with no boost (or heat soak), and coolant temps of 180. If intake temps are close to ambient, would they cool the TB enough to effect my sender?
Helpful comments appreciated
Thanks, Adam
#2
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I also have the sender "T" into the coolant line at the throttle ,one thing i can say is that it seems to be roughly 10 degrees lower than what the power FC says (which is the thermostat housing)
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To add mate, when im crusing on the motorway im getting tempratures about 72 degrees which is about 162F roughly same as yours (i have M2 large intercooler and noticed that when lifting the bonnet after motorway cruising the throttle body is remarkably cool so i wouldnt be supprised if this was responsible for the difference in temprature between throttle body and thermostat housing)
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The PFC uses the temp sensor mounted in the block, not in the t-stat housing.
Hey Adam, how are things? AITs on my car in that type of weather just cruising are typically in the high teens C.
Hey Adam, how are things? AITs on my car in that type of weather just cruising are typically in the high teens C.
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Same thing here in San Diego.
My car rarely ever runs below 85C even in cold NY winters when I lived there. A few days ago, I was cruising down a long hill (Torrey Pines) w/o throttle input at all and was surprised to see my coolant at 82C and AITs in low 20C iirc.
Ambient was something around 50F. Brrr that was cold.
My car rarely ever runs below 85C even in cold NY winters when I lived there. A few days ago, I was cruising down a long hill (Torrey Pines) w/o throttle input at all and was surprised to see my coolant at 82C and AITs in low 20C iirc.
Ambient was something around 50F. Brrr that was cold.
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#8
Originally Posted by rynberg
.....Hey Adam, how are things? AITs on my car in that type of weather just cruising are typically in the high teens C.
Originally Posted by BillM
Yesterday in NJ it was 20deg. My TB sensor moved between 180-220. Same as it does in the summer.
#10
When I first installed the TB sensor, I tested it against my upper radiator hose sender. The tests were done at idle. I got almost identical readings at several different temperatures. I didn't do a test with the car in motion. I have not removed the radiator hose sender, or the wiring to it. Perhaps I should do a test to see what differences there are during driving conditions.
#11
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I have the sensor mounted in the TB hose (of course!) and I also have the HKS fan controller that reads temps from the ECU's water temp sensor which is on the back of the water pump housing right by the fan thermoswitch. BTW, this is also where the PFC reads its temps from.
My temps dead-on agree with each other, but I had some air in the system after the intercooler install and would sometimes read lower on the gauge due to the air.
Besides that, they've dead-on agreed with each other. Sometimes when warming up the temp gauge reads higher, as it's seeing the hottest water in the engine first. That sender might also react a bit faster as well. Once up to temp, they agree within one or two degrees.
Dale
My temps dead-on agree with each other, but I had some air in the system after the intercooler install and would sometimes read lower on the gauge due to the air.
Besides that, they've dead-on agreed with each other. Sometimes when warming up the temp gauge reads higher, as it's seeing the hottest water in the engine first. That sender might also react a bit faster as well. Once up to temp, they agree within one or two degrees.
Dale
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Rynberg as dale said the temprature sensor is mounted with the fan switch in the water pump/thermo housing (i was racking my brains then thinking i dont remember the temprature sensor been in the block). ive noticed my throttle coolant line gauge is always 10 degrees short of my power FC from cold until they reach about 170F then they seem to be within 2 degrees of each other.
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Originally Posted by DaleClark
Sometimes when warming up the temp gauge reads higher, as it's seeing the hottest water in the engine first. That sender might also react a bit faster as well. Once up to temp, they agree within one or two degrees.
Dale
Dale
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