Coolant temperature has never run so low.
07-14-2017, 10:30 AM
#1
Race Director
Thread Starter
Coolant temperature has never run so low.
Since my purchase in 2006, my '99 coupe has never run this cool, not even in winter. Just took a 25 mile spirited drive
on back twisty roads and my coolant temp. never got over 80 degrees celsius(176 F). I had been postponing a water pump and thermostat(low temp. from Jake Raby) replacement and a coolant flush for awhile, but now that has been done and I no longer have 90-95 degree celsius temperatures. My WP and thermostat were original with 74k miles. There were no leaks or signs of WP failure, but I won't wait as long next time. I rarely drive my Porsche without displaying the coolant temperature, but I may now with much cooler operating temperatures.Nothing that earth shattering, but I thought I'd share my results.
on back twisty roads and my coolant temp. never got over 80 degrees celsius(176 F). I had been postponing a water pump and thermostat(low temp. from Jake Raby) replacement and a coolant flush for awhile, but now that has been done and I no longer have 90-95 degree celsius temperatures. My WP and thermostat were original with 74k miles. There were no leaks or signs of WP failure, but I won't wait as long next time. I rarely drive my Porsche without displaying the coolant temperature, but I may now with much cooler operating temperatures.Nothing that earth shattering, but I thought I'd share my results.
07-14-2017, 11:11 AM
#2
Drifting
Great data point in favor of LTT. Oddly ,there are some who are still skeptics about the LTT.
Did you also clean the gap between the radiators and condensers ?Just wondering if that contributed to your positive result.
To give others further encouragement to optimize the cooling system - see the Threads were the actual temperature of the hottest part of the system is contrasted to the gauge reading.
Did you also clean the gap between the radiators and condensers ?Just wondering if that contributed to your positive result.
To give others further encouragement to optimize the cooling system - see the Threads were the actual temperature of the hottest part of the system is contrasted to the gauge reading.
07-14-2017, 12:33 PM
#3
Race Director
Great data point in favor of LTT. Oddly ,there are some who are still skeptics about the LTT.
Did you also clean the gap between the radiators and condensers ?Just wondering if that contributed to your positive result.
To give others further encouragement to optimize the cooling system - see the Threads were the actual temperature of the hottest part of the system is contrasted to the gauge reading.
Did you also clean the gap between the radiators and condensers ?Just wondering if that contributed to your positive result.
To give others further encouragement to optimize the cooling system - see the Threads were the actual temperature of the hottest part of the system is contrasted to the gauge reading.
And the LTT recommendation ignores the results of industry testing over the years that has found engine wear increases with a decrease in operating temperature and engine performance (and fuel economy) improve with an increase in operating temperature.
But the OP's engine didn't blow in his test drive so the LTT science is settled then.
07-14-2017, 12:58 PM
#4
Rennlist Member
Amazing the OP's 996 engine lasted 74K miles with that bad old factory T-Stat in there.
And the LTT recommendation ignores the results of industry testing over the years that has found engine wear increases with a decrease in operating temperature and engine performance (and fuel economy) improve with an increase in operating temperature.
But the OP's engine didn't blow in his test drive so the LTT science is settled then.
And the LTT recommendation ignores the results of industry testing over the years that has found engine wear increases with a decrease in operating temperature and engine performance (and fuel economy) improve with an increase in operating temperature.
But the OP's engine didn't blow in his test drive so the LTT science is settled then.
07-14-2017, 01:01 PM
#5
Race Director
Thread Starter
Great data point in favor of LTT. Oddly ,there are some who are still skeptics about the LTT.
Did you also clean the gap between the radiators and condensers ?Just wondering if that contributed to your positive result.
To give others further encouragement to optimize the cooling system - see the Threads were the actual temperature of the hottest part of the system is contrasted to the gauge reading.
Did you also clean the gap between the radiators and condensers ?Just wondering if that contributed to your positive result.
To give others further encouragement to optimize the cooling system - see the Threads were the actual temperature of the hottest part of the system is contrasted to the gauge reading.
07-14-2017, 01:07 PM
#6
Race Director
Thread Starter
Amazing the OP's 996 engine lasted 74K miles with that bad old factory T-Stat in there.
And the LTT recommendation ignores the results of industry testing over the years that has found engine wear increases with a decrease in operating temperature and engine performance (and fuel economy) improve with an increase in operating temperature.
But the OP's engine didn't blow in his test drive so the LTT science is settled then.
And the LTT recommendation ignores the results of industry testing over the years that has found engine wear increases with a decrease in operating temperature and engine performance (and fuel economy) improve with an increase in operating temperature.
But the OP's engine didn't blow in his test drive so the LTT science is settled then.
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07-14-2017, 01:40 PM
#8
I have same results with my water pump and LN LTT swap. Put 2500 hot summer traffic commuting miles on since and its running great. No noticeable dif in fuel consumption. I will say the trans shifts on my TIP have gotten very noticeably smoother then when it was at temp with OE therm. Esp between into first, 2 to 3, and 3 down to 2. I am very happy with it so far.
07-14-2017, 01:52 PM
#9
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Join Date: Dec 2016
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Same here. Temperature settles during driving at 82C (LTT fully open) and with airco on will stay during city driving between 82-86C. With airco off it will go up obviously because then the fans are off. No LN thermostat so I believe it is a Wahler. Does the same as far as I can observe.
With the location of the thermostat where it is the engine will be running at a somewhat higher temperature then indicated. Seems totally OK to me!
With the location of the thermostat where it is the engine will be running at a somewhat higher temperature then indicated. Seems totally OK to me!
07-14-2017, 01:54 PM
#10
Advanced
I did my LTT swap last week. I was constantly running at 186F at cruising and 197F in traffic (with fans on). Now i run 174F at cruising speed and 186F in heavy traffic with fans on. On days over 90+F i was running up to 204F in traffic and now it's at 192F.
07-14-2017, 01:55 PM
#11
Rennlist Member
I put in a LN LTT and new water pump last year, had no change in readings on the dash. I find this thread interesting and most who put in the LTT do not see any changes in readings, it just opens sooner.
07-14-2017, 02:11 PM
#13
Advanced
I have a OBD2 scanner/guage installed and it gives digital readouts which is more precise then the dash guages. Before LTT the dash needle would sit between "8" and "0" (which is 186F on digital). Now it sits just a hair left of the line mark above the "8" (which is 174F on digital).
07-14-2017, 02:24 PM
#15
Rennlist Member
Since my purchase in 2006, my '99 coupe has never run this cool, not even in winter. Just took a 25 mile spirited drive on back twisty roads and my coolant temp. never got over 80 degrees celsius(176 F). I had been postponing a water pump and thermostat(low temp. from Jake Raby) replacement and a coolant flush for awhile, but now that has been done and I no longer have 90-95 degree celsius temperatures. My WP and thermostat were original with 74k miles. There were no leaks or signs of WP failure, but I won't wait as long next time. I rarely drive my Porsche without displaying the coolant temperature, but I may now with much cooler operating temperatures.Nothing that earth shattering, but I thought I'd share my results.
on back twisty roads and my coolant temp. never got over 80 degrees celsius(176 F). I had been postponing a water pump and thermostat(low temp. from Jake Raby) replacement and a coolant flush for awhile, but now that has been done and I no longer have 90-95 degree celsius temperatures. My WP and thermostat were original with 74k miles. There were no leaks or signs of WP failure, but I won't wait as long next time. I rarely drive my Porsche without displaying the coolant temperature, but I may now with much cooler operating temperatures.Nothing that earth shattering, but I thought I'd share my results.