Engine Temp Difference in Sport Mode?
08-11-2018, 07:55 PM
#1
Race Car
Thread Starter
Engine Temp Difference in Sport Mode?
Have been using Sport Mode more and more lately and have noticed a distinct lower engine temperature as opposed to Normal Mode.
Has anyone else noticed this?
For example, on a 97-98 degree day my engine temperature is usually up at 218 - 221.
But when I turn on Sport Mode, my engine temperature is literally locked at 191, and sometimes is as low as 189.
These temps are registered when doing suburban boulevard cruising with traffic with speeds between 25 and 55.
Has anyone else noticed this?
Has anyone else noticed this?
For example, on a 97-98 degree day my engine temperature is usually up at 218 - 221.
But when I turn on Sport Mode, my engine temperature is literally locked at 191, and sometimes is as low as 189.
These temps are registered when doing suburban boulevard cruising with traffic with speeds between 25 and 55.
Has anyone else noticed this?
Last edited by Diablo Dude; 08-11-2018 at 08:20 PM.
08-11-2018, 09:32 PM
#2
Yes. Activation of the sport mode and its result on temp display/values has been discussed numerous times on here. Please search for more details.
08-11-2018, 09:45 PM
#3
Rennlist Member
Have been using Sport Mode more and more lately and have noticed a distinct lower engine temperature as opposed to Normal Mode.
Has anyone else noticed this?
For example, on a 97-98 degree day my engine temperature is usually up at 218 - 221.
But when I turn on Sport Mode, my engine temperature is literally locked at 191, and sometimes is as low as 189.
These temps are registered when doing suburban boulevard cruising with traffic with speeds between 25 and 55.
Has anyone else noticed this?
Has anyone else noticed this?
For example, on a 97-98 degree day my engine temperature is usually up at 218 - 221.
But when I turn on Sport Mode, my engine temperature is literally locked at 191, and sometimes is as low as 189.
These temps are registered when doing suburban boulevard cruising with traffic with speeds between 25 and 55.
Has anyone else noticed this?
08-11-2018, 09:59 PM
#4
Rennlist Member
Sport mode on a GT4 only engages the thermostat heater and activates the auto-blipper. That's all. It does not "engage" the center radiator -- the center radiator is always "active", just like the other radiators.
08-11-2018, 10:15 PM
#5
Rennlist Member
08-12-2018, 05:11 AM
#6
I have also noticed lower temp while in sport mode. Can hear the fan working as well.
08-12-2018, 05:22 PM
#7
Race Car
Thread Starter
2.8.1 Coolant temperature level, engine
The operating temperature is reached quickly thanks to a rotating piston valve that is actuated by the DME control unit according to a control map. The engine is at operating temperature when an engine coolant temperature of 221° F (105° C)
is reached.
Map-controlled thermostat
The thermostat is an insertion map-controlled thermostat with a heating element. The electric heating element of the map-controlled thermostat is energized via the DME control unit. The flow of current through the heating element (electric resistor) causes it to heat up, which in turn influences the expansion element in the thermostat and enables it to be opened. Actuation by the DME control unit is performed by means of pulse width modulation (between 2.5 and 97.5%), which means that the coolant temperature level can be continuously controlled.
The usual coolant temperature is 221° F (105° C) when the engine of the Cayman GT4 is at operating temperature; it is reduced to 185° F (85° C) during sporty driving and in Sport/Sport Plus mode by opening (energizing) the thermostat. This supports a performance-oriented driving style.
The DME control unit can also have the thermostat closed by switching off the heating current. A precondition for this is a coolant temperature of less than 216° F (102° C). The map-controlled thermostat starts to open at 216° F (102° C) +/- 4° F (2° C) when de-energized and is fully open at 239° F (115° C).
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08-13-2018, 01:40 AM
#8
Drifting
08-13-2018, 10:29 AM
#9
08-13-2018, 10:55 AM
#10
Rennlist Member
Thanks!
2.8.1 Coolant temperature level, engine
The operating temperature is reached quickly thanks to a rotating piston valve that is actuated by the DME control unit according to a control map. The engine is at operating temperature when an engine coolant temperature of 221° F (105° C)
is reached.
Map-controlled thermostat
The thermostat is an insertion map-controlled thermostat with a heating element. The electric heating element of the map-controlled thermostat is energized via the DME control unit. The flow of current through the heating element (electric resistor) causes it to heat up, which in turn influences the expansion element in the thermostat and enables it to be opened. Actuation by the DME control unit is performed by means of pulse width modulation (between 2.5 and 97.5%), which means that the coolant temperature level can be continuously controlled.
The usual coolant temperature is 221° F (105° C) when the engine of the Cayman GT4 is at operating temperature; it is reduced to 185° F (85° C) during sporty driving and in Sport/Sport Plus mode by opening (energizing) the thermostat. This supports a performance-oriented driving style.
The DME control unit can also have the thermostat closed by switching off the heating current. A precondition for this is a coolant temperature of less than 216° F (102° C). The map-controlled thermostat starts to open at 216° F (102° C) +/- 4° F (2° C) when de-energized and is fully open at 239° F (115° C).
2.8.1 Coolant temperature level, engine
The operating temperature is reached quickly thanks to a rotating piston valve that is actuated by the DME control unit according to a control map. The engine is at operating temperature when an engine coolant temperature of 221° F (105° C)
is reached.
Map-controlled thermostat
The thermostat is an insertion map-controlled thermostat with a heating element. The electric heating element of the map-controlled thermostat is energized via the DME control unit. The flow of current through the heating element (electric resistor) causes it to heat up, which in turn influences the expansion element in the thermostat and enables it to be opened. Actuation by the DME control unit is performed by means of pulse width modulation (between 2.5 and 97.5%), which means that the coolant temperature level can be continuously controlled.
The usual coolant temperature is 221° F (105° C) when the engine of the Cayman GT4 is at operating temperature; it is reduced to 185° F (85° C) during sporty driving and in Sport/Sport Plus mode by opening (energizing) the thermostat. This supports a performance-oriented driving style.
The DME control unit can also have the thermostat closed by switching off the heating current. A precondition for this is a coolant temperature of less than 216° F (102° C). The map-controlled thermostat starts to open at 216° F (102° C) +/- 4° F (2° C) when de-energized and is fully open at 239° F (115° C).
08-13-2018, 11:28 AM
#11
Race Car
Thread Starter
08-13-2018, 12:40 PM
#13
Rennlist Member
Interesting. My understanding is Al block/head motors are at risk for warping above 230-240F coolant temp. I have actually warped a BMW straight 6 head at similar temps. Seems nuts to not even open the TS all the way until it's about too late, but maybe I'm missing something.
08-13-2018, 04:04 PM
#14
Race Car
Thread Starter
Interesting. My understanding is Al block/head motors are at risk for warping above 230-240F coolant temp. I have actually warped a BMW straight 6 head at similar temps. Seems nuts to not even open the TS all the way until it's about too late, but maybe I'm missing something.
https://rennlist.com/forums/gt4/8824...erature-3.html