Cooling upgrade question
#41
I appreciate you guys providing input that suggests my car is broken, but I assure you it is not. The only reason I posted in this thread was to advise the OP that the hood louvers were WAY overkill for a street driven car due to what I've seen with my car with the same radiator he was looking at getting. Prior to having the hood louvers installed and all else exactly the same the car would be right in the proper range of ~180-205* while on track as it should be. I added the hood louvers due to an assumed underhood temperature build up issue that I THOUGHT was present due to continually cooking my CPS on track. It turned out that what I thought was excessive heat build up and cheap CPS replacements was not the actual culprit as the cause was that the CLIP for the CPS was faulty. Put a new pigtail on and problem went away. However, I had already installed the hood louvers, so I can't exactly take them off...nor do I feel the need to source a different hood.
My point was that the hood louvers increased air flow so much that while moving at race pace, and ONLY while moving, during a cooler month event (March and November) then my car overcools. The rest of the year it settles in 10-15* degrees below target exactly as it should with the increased airflow of the hood louvers. This past weekend in particular was so cold in the morning that some of the Spec Miata guys were taping their radiators, indicating that they, too, were overcooling. I'm willing to bet that taping up my louvers will bring the temperature at race pace back up to 180-190.
At the end of the day I wish I didn't have the hood louvers as it was unnecessary money spent on top of being an unnecessary modification now that I have found the cause of my CPS issue. I simply did not want the OP to make the same unnecessary mistake I did. I'm sure I will, however, thoroughly enjoy the louvers if/when I decide to build for SPM S1 and/or NASA ST4 and add a heat generator under the hood haha.
#43
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Your bypass is the heater core. Warmup time is the same. Larger radiators only allow the water in them to cool for a longer period of time.
Your Tstat will will only open slightly if head temp is 180* and coolant is 60*. Its not an on/off switch, it opens in increments. Properly functioning Tstat will open only just slightly so that a small amount of very cold coolant will enter, keeping the coolant temp in the head at 180*.
Your Tstat will will only open slightly if head temp is 180* and coolant is 60*. Its not an on/off switch, it opens in increments. Properly functioning Tstat will open only just slightly so that a small amount of very cold coolant will enter, keeping the coolant temp in the head at 180*.
And thanks for the info Quigs. It seems that the reroute + upgraded radiator + louvers would definitely be overkill for a street car. With this in mind, I was tickled with the thought of having the reroute with a stock radiator, and louvers. I do just generally like the idea of having the engine bay be cooler overall instead of being warmed by the stagnant-ish air.
Regardless, cost savings of getting the m.net glorified amazon tyc special - seems to be a moot point now that it seems the generic ~2" core aluminum radiators are "trusted" while being just $20 more. So it'll be that with contemplating getting a QMAX installed in the back with the engine still in the car. Any have experience installing that withOUT removing bolts off the PPF to tilt the engine forward to get more clearance during install? I fear that I'm not particularly secure in bolting it back (the PPF) in place with the right alignment, etc. afterwards.
#44
So it'll be that with contemplating getting a QMAX installed in the back with the engine still in the car. Any have experience installing that withOUT removing bolts off the PPF to tilt the engine forward to get more clearance during install? I fear that I'm not particularly secure in bolting it back (the PPF) in place with the right alignment, etc. afterwards.
Overall it wasn't that horrible, it took a whole day but I suck at cars so take that with a grain of salt. Two recommendations though, get a thin socket for the bolt that goes into the head it's a tight fit. Replace the heater core hose that connects to the housing. I about **** myself when it started leaking a day later, I was convinced I botched the gasket maker on the q-max and was going to have to pull it, but it was just the tired old hose.
#46
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You say you have a proper reroute. I would question that. I'm guessing the overcooling has something to do with the design of your reroute.
And to the other question, boats have an unlimited supply of cool liquid and use a thermostat to regulate their temperature. A properly working thermostat and water pump does not allow it to over cool or under cool.
Additionally, thermostats are not a binary device that are either 100% open or 100% closed. They can open gradually if exposed to a slow warming near their target temperature and close gradually as well. It is possible to have one just slightly open if maintaining and even temperature right near the opening value.
And to the other question, boats have an unlimited supply of cool liquid and use a thermostat to regulate their temperature. A properly working thermostat and water pump does not allow it to over cool or under cool.
Additionally, thermostats are not a binary device that are either 100% open or 100% closed. They can open gradually if exposed to a slow warming near their target temperature and close gradually as well. It is possible to have one just slightly open if maintaining and even temperature right near the opening value.
#47
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Sixshooter - I like the boat example. Good good.
Also - random question. Back in the day, there used to be a brand or something called "failsafe" thermostats (aka...when it fails, it fails open) - are all thermostats today, that way, now? Or do I need to specifically look for it to be called out?
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09-11-2018 02:38 PM