S13 CA18DET @ 260HP
Something odd-ish that I noticed. I have been doing a few top speed runs that made the stock water temp gauge climb towards the red border for the first time. However the aftermarket one wasn't showing over 85c (185f). The temperatures given by two different sensors were quite far apart.
As soon as the stock gauge reaches a notch before red, I back off. The defi reads 85c. I can cruise 180-190km/h fine but over that more power is needed and that is when the engine starts getting warm.
Now having looked at this thread and incredible input by John Bennet: http://www.sxoc.com/vbb/showpost.php...4&postcount=64
It looks as the water temperature measured before the thermostat by the stock sender (replaced sender and stat 10k ago) should be around 105c (221f), so it differs by about 20c from the radhose temperature. Can this be true?
I have measured the Defi with a water boiler and it read 100c (212f) precisely, so I'm thinking that the reading from the top hose is accurate. I also think - based on mr. Bennets findings - that the stock gauge is accurate. But where does this 20-25c difference comes from, what am I missing?
Could it be an air lock? I doubt it as the gauges all work fine the rest of the time, and I also purged the cooling system a few times. Well.. purged, I took the stock sender out and filled it up till coolant came out and let it idle with rad cap off a few times.
What are your views guys?
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Ok I had a thought while writing this;
The "overheating" happens during 200kp/h + action. That goes paired with a lot of cooling air. Can it be the front of the radiator hose (where the accurate sensor is) gets cooled enough to drop the temp 15c? Cause the airflow is extreme, plus the visco fan is blowing to the side as well, right at the sensor housing...?
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Something odd-ish that I noticed. I have been doing a few top speed runs that made the stock water temp gauge climb towards the red border for the first time. However the aftermarket one wasn't showing over 85c (185f). The temperatures given by two different sensors were quite far apart.
As soon as the stock gauge reaches a notch before red, I back off. The defi reads 85c. I can cruise 180-190km/h fine but over that more power is needed and that is when the engine starts getting warm.
Now having looked at this thread and incredible input by John Bennet: http://www.sxoc.com/vbb/showpost.php...4&postcount=64
It looks as the water temperature measured before the thermostat by the stock sender (replaced sender and stat 10k ago) should be around 105c (221f), so it differs by about 20c from the radhose temperature. Can this be true?
I have measured the Defi with a water boiler and it read 100c (212f) precisely, so I'm thinking that the reading from the top hose is accurate. I also think - based on mr. Bennets findings - that the stock gauge is accurate. But where does this 20-25c difference comes from, what am I missing?
Could it be an air lock? I doubt it as the gauges all work fine the rest of the time, and I also purged the cooling system a few times. Well.. purged, I took the stock sender out and filled it up till coolant came out and let it idle with rad cap off a few times.
What are your views guys?
--
Ok I had a thought while writing this;
The "overheating" happens during 200kp/h + action. That goes paired with a lot of cooling air. Can it be the front of the radiator hose (where the accurate sensor is) gets cooled enough to drop the temp 15c? Cause the airflow is extreme, plus the visco fan is blowing to the side as well, right at the sensor housing...?
--
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