Coolant Temps
05-02-2007, 04:42 PM
#21
Scott is getting his temp from the thermosensor in the back of the head. The sensor in the tstat housing is actually thermoswitch that goes to ground at 97c- which IMO is too late for a boosted car in the south. The link can control the fans though if you run a relay ground to the designated pin on the ecu (I did it per the manual). My fan comes on when the car comes to a stop - set to 95c (which I believe is the stock NA 1.8 setting).
Would be nice to see some oil and coolant temps from water/oil cooled turbos, and oil cooled only turbos.
I'd post my oil temps, but they're not representative of a working system. Either my sending unit is whacked OR my oil tstat in the sandwich plate (with cooler attached) isn't working. On my 3 hour round trip I was getting 270f at 3500-4000 cruise. Boost showed the same.
Would be nice to see some oil and coolant temps from water/oil cooled turbos, and oil cooled only turbos.
I'd post my oil temps, but they're not representative of a working system. Either my sending unit is whacked OR my oil tstat in the sandwich plate (with cooler attached) isn't working. On my 3 hour round trip I was getting 270f at 3500-4000 cruise. Boost showed the same.
I've got an oil temp gauge, and the sender is in the drain plug. Getting anything really meaningful from this is tough since it takes a long time for either the oil in the sump to get hot or the sender is REALLY slow. So I don't know if I could show a difference between boosted and none-boosted. I also think the oil pan does a pretty reasonable job at cooling the oil when driving. I can see my oil temps come up significantly when in slow moving traffic.
Also it takes a good 15 to 20 minutes to get any movement on the gauge, which starts at 140.
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05-02-2007, 04:50 PM
#26
My oil will be at 220 from a warm 180 if I make several boosted runs. Around town driving I see 240 - but constant hwy cruise shows 270f and that's just plain wrong for somebody with over 5 qts oil capacity and a cooler.
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05-02-2007, 04:54 PM
#29
Yes you could, since you're just substituting the ecu for the thermoswitch ground- I've got a giant spal that pulls about 22amps on startup so it's got a 30amp relay. The real advantage of using the ecu is being able to control your fan points depending on season. It's far easier to keep the fluids from getting hot, than to try and cool them down after they've gotten hot.
My oil will be at 220 from a warm 180 if I make several boosted runs. Around town driving I see 240 - but constant hwy cruise shows 270f and that's just plain wrong for somebody with over 5 qts oil capacity and a cooler.
My oil will be at 220 from a warm 180 if I make several boosted runs. Around town driving I see 240 - but constant hwy cruise shows 270f and that's just plain wrong for somebody with over 5 qts oil capacity and a cooler.
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05-02-2007, 06:36 PM
#31
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ok, reflashed it correctly with Aussie's settings.
Reading closer to 170 after sitting for a minutes, low speed cruise I dip down to 160-165, if i sit at a light it hits 170 then peaks at about 175 when the fans turn on. so I'm going to assume it's good.
Reading closer to 170 after sitting for a minutes, low speed cruise I dip down to 160-165, if i sit at a light it hits 170 then peaks at about 175 when the fans turn on. so I'm going to assume it's good.
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05-02-2007, 09:42 PM
#35
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Both sensors were mounted next to each other.
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05-03-2007, 10:27 AM
#37
Tstat fully opens at 100c
I thought this was interesting. It's the OE specs for the FE tstat (my engine).
The tstat isn't fully open until 100C! I've got the fan coming on at 94c and shutting off at 88c. 100c seems incredibly high for full coolant flow to be initiated - no? Wonder if there's a spec like this for the Miata engines?
The tstat isn't fully open until 100C! I've got the fan coming on at 94c and shutting off at 88c. 100c seems incredibly high for full coolant flow to be initiated - no? Wonder if there's a spec like this for the Miata engines?
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05-03-2007, 11:00 AM
#40
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I thought this was interesting. It's the OE specs for the FE tstat (my engine).
The tstat isn't fully open until 100C! I've got the fan coming on at 94c and shutting off at 88c. 100c seems incredibly high for full coolant flow to be initiated - no? Wonder if there's a spec like this for the Miata engines?
The tstat isn't fully open until 100C! I've got the fan coming on at 94c and shutting off at 88c. 100c seems incredibly high for full coolant flow to be initiated - no? Wonder if there's a spec like this for the Miata engines?
Last edited by y8s; 01-12-2009 at 12:34 PM.
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