Dual Spal teperature switch choices
Thread Starter
Race Director
Joined: Jul 2004
Posts: 12,679
Likes: 329
From: Scottsdale Arizona
Dual Spal teperature switch choices
For those of you that are running dual spal setups, what temperature switch(es) are you running? My kit came with a single, 195 degree switch which I installed in the driver's side head. Both fans are connected to this switch. I was contemplating putting a higher temp switch in the other head (210). I know others are running the second fan on direct ground so it runs as soon as the ignition comes on. Any consensus?
Also, I'm trying to verify the running temperature of the coolant against the temperature gauge with an IR thermometer. Is the upper rad hose a good approximation? Will this give a false, low reading? Is there a better place to compare it from?
Also, I'm trying to verify the running temperature of the coolant against the temperature gauge with an IR thermometer. Is the upper rad hose a good approximation? Will this give a false, low reading? Is there a better place to compare it from?
Le Mans Master
Joined: Dec 2007
Posts: 6,422
Likes: 591
From: McHenry Illinois
Checking the temp on the intake manifold near the thermostat housing or near the head should give you a more accurate reading. You could also check it with the IR gun near the temp sensor in the head, but you may read some of the heat the exhaust manifold or header is giving off.
Melting Slicks
Joined: Jun 2005
Posts: 2,293
Likes: 6
From: North of the Bay California
Thread Starter
Race Director
Joined: Jul 2004
Posts: 12,679
Likes: 329
From: Scottsdale Arizona
Melting Slicks
Joined: Jun 2005
Posts: 2,293
Likes: 6
From: North of the Bay California
..but I think it's the dk50. I believe it has 3 different temp settings(as max settings) . It's very compact. btw, it comes with a temp sensor that he suggests mounting near the inlet in between the fins, for a good reading.
Race Director
Joined: Jun 2000
Posts: 10,036
Likes: 667
From: FL
195 switch wired to both fans with a 180 Hi-Flow thermostat (BeCool radiator). Fans never run on the highway and cycle in town. Usually about a minute for them to cool the radiator down and shut off.
IMHO, simple is best. No fan running all the time, no dual temp switches. Works great for the last 10 years.
IMHO, simple is best. No fan running all the time, no dual temp switches. Works great for the last 10 years.
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
Zirgo makes a temp switch that is a "180* on 175* off". I use this one and it works well BUT if you mount it in the radiator tank like the Dewitts rad has, it will actually kick on at 185*, off at 178*. For the most part, my car hovers in the 175-180* range. If it idles enough to get to 185-186*, the MK8 fan kicks on and it's below 180* in 30 secs or so.
Ok but I wish the fan kicked on right at 180* and off at 170-175*. I would have to move the sensor to the intake to get it closer to 180. Gonna leave it as is for now though.
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Drifting
Joined: Jul 2009
Posts: 1,532
Likes: 14
From: Dallas-Fort Worth TX
Rob I would not be running YOUR engine that hot...especially with AC.
Zirgo makes a temp switch that is a "180* on 175* off". I use this one and it works well BUT if you mount it in the radiator tank like the Dewitts rad has, it will actually kick on at 185*, off at 178*. For the most part, my car hovers in the 175-180* range. If it idles enough to get to 185-186*, the MK8 fan kicks on and it's below 180* in 30 secs or so.
Ok but I wish the fan kicked on right at 180* and off at 170-175*. I would have to move the sensor to the intake to get it closer to 180. Gonna leave it as is for now though.
Zirgo makes a temp switch that is a "180* on 175* off". I use this one and it works well BUT if you mount it in the radiator tank like the Dewitts rad has, it will actually kick on at 185*, off at 178*. For the most part, my car hovers in the 175-180* range. If it idles enough to get to 185-186*, the MK8 fan kicks on and it's below 180* in 30 secs or so.
Ok but I wish the fan kicked on right at 180* and off at 170-175*. I would have to move the sensor to the intake to get it closer to 180. Gonna leave it as is for now though.
I have not been using the AC either. I think my compressor has a leak. It keeps oozing this oil out. I guess that is the pag oil.
