turbo coolant flow question
11-10-02, 05:46 PM
#1
don't race, don't need to
Thread Starter
turbo coolant flow question
So I've been trying to figure out whether the coolant flow through the turbos is before or after the thermostat.
Here's the deal: When I prepare to shut the car off, I turn on the fans to low for about a minute. This pulls the gauge temp down to 177F, right at the thermostat's lowest open temperature. Then I shut it off and open the hood. What I'm wondering is, am I cooling the turbos as well when I do this? The sensor is in the block, the fans in the radiator, and when the thermostat is closed, these two systems become more or less separated. What I don't know is if the turbos are "isolated" to the radiator circuit (in front of the thermostat) wherin the temp gauge would not show the turbo temp, if you will. Thus, my engine might be cooled to a good temp, but the turbos still need more cooling time before shutoff.
So can anyone definately tell me where the turbo cooling lines lie with respect to the water pump/thermostat/radiator?
Thanks in advance and stuff..
Here's the deal: When I prepare to shut the car off, I turn on the fans to low for about a minute. This pulls the gauge temp down to 177F, right at the thermostat's lowest open temperature. Then I shut it off and open the hood. What I'm wondering is, am I cooling the turbos as well when I do this? The sensor is in the block, the fans in the radiator, and when the thermostat is closed, these two systems become more or less separated. What I don't know is if the turbos are "isolated" to the radiator circuit (in front of the thermostat) wherin the temp gauge would not show the turbo temp, if you will. Thus, my engine might be cooled to a good temp, but the turbos still need more cooling time before shutoff.
So can anyone definately tell me where the turbo cooling lines lie with respect to the water pump/thermostat/radiator?
Thanks in advance and stuff..
11-10-02, 11:42 PM
#2
Rotary Enthusiast
I'm not sure what your definition of before or after is. But the coolant flows from the block through the tstat to the radiator, then pumped back in. On one side on the t-stat there is only the radiator (and ast).
The temperature sensor is located on the opposite end to the turbos (before the coolant gets to the turbos). So you assumption is correct, you would not see the temp fluctuations at the turbos. That is also why turbo timers are made.
In general here is the sequence, more or less:
Radiator->water pump->block->turbos->t-stat->radiator. Hope this helps.
The temperature sensor is located on the opposite end to the turbos (before the coolant gets to the turbos). So you assumption is correct, you would not see the temp fluctuations at the turbos. That is also why turbo timers are made.
In general here is the sequence, more or less:
Radiator->water pump->block->turbos->t-stat->radiator. Hope this helps.
11-11-02, 01:06 AM
#3
Rotary Enthusiast
turbo coolant comes from high pressure port on wp housing. return is at wp suction. so yes if t-stat closed, then the engine loop and tubo loop are separated, but join and mix as they pass thru pump.
if an gauge on front of tstat cover is 177, coolant flowing in hsg and turbos are not much over 180, or tstat would crack open.
Can still get some gurgle, since pressure drops with long cool cycle, and coolant at 50/50 will boil at 225F, possible with heat soak from turbos.
http://home.istar.ca/~dvandit/coolingsystem.htm
if an gauge on front of tstat cover is 177, coolant flowing in hsg and turbos are not much over 180, or tstat would crack open.
Can still get some gurgle, since pressure drops with long cool cycle, and coolant at 50/50 will boil at 225F, possible with heat soak from turbos.
http://home.istar.ca/~dvandit/coolingsystem.htm
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