Quote:
Originally Posted by Irace86.2.0
I don’t know if there are situations beyond oil coolers in cool weather where overcooling might be an issue, especially at the factory level; it seems more possible on aftermarket cars where cooling systems are setup for worse case cooling needs and not for all environmental needs. I probably missinterpreted unnecessary cooling as avoiding overcooling; I concede that those are definitely different things.
Considering radiators and intercoolers are often much taller than the bumper openings, and they are thus blocked from any significant air flow, it seems like stacking a cooler might not be a big deal, especially when size often can trump being behind dirty air, as might be the case for SMIC versus FMIC, or where there is a compromise between air flow and ducting to brakes versus an oil cooler or SMIC.
I think there is still a case for determining what are the OP’s needs, if not for avoiding overcooling because that isn’t a thing, then more for not doing anything that is overkill like purchasing things that aren’t necessary or putting work into designing/fabricating a solution for a problem that may not exist.
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It's precisely why variable thermostats exist. Lets revisit the Supra. Like most modern non-economy cars, it has 4 states.
1. everything closed, circulate within engine only. This is to warm the engine up as quickly as possible to minimize emissions.
2. heater core only. For comfort. In typical california conditions, the heater will be warm within 25-30 seconds in such cars.
3. low flow. For economy. Regulates coolant temp to about 105C.
4. Max cooling. Typically regulates coolant temp to a floor of 85C.
Many folks going into a supra complained that their cars were running hot/overheating when they saw 105-108C cruising, not realizing.... that's how all modern euro cars are, whether its a Supra, BMW, Porsche, Merc, or Audi. Even basic VWs do this.
Why do most 86's "overcool the oil"? Because people just don't seem to be able to get it into their heads that the oil temp observed is post-cooler. And the thermostatic plates are very basic.
Cooling is an equilibrium problem. A hot oil cooler in front of an intercooler, even if the intercooler is much larger, hurts efficiency.