Quote:
Originally Posted by bNks334
Previously, n54 platforms cooled oil via an oil to water heat exchanger. Therefore, coolant temperatures did used to play a larger role in lowering oil temps.
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Engine oil or AT oil? Engine oil never. AT oil always.
Quote:
Originally Posted by bNks334
When BMW upped the power output with the ppk they also had to improve the water cooling as well via an additional radiator and a larger fan as well to help keep temps down in traffic.
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What difference would make additional coolant radiator in traffic?
Quote:
Originally Posted by bNks334
However, BMW has since reseperated the two cooling functions. Oil cooling is now achieved via an oil to air radiator. Oil is not tied to the water via a heat exchanger anymore.
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The two cooling functions are not separated on all n54/55 as on some coolant is still the solely cooling remedy. Engine oil was never tied with heat exchanger.
Quote:
Originally Posted by bNks334
Further, oil and coolant do not cool the same parts of the engine. When you up the power levels, yes, you generate more heat. This heat is almost directly going to cause oil temps to rise. Through conduction, heat from the oil cooled portions of the engine can indeed cause an increase in coolant temps. However, data does not support that the radiator is a bottleneck in engine cooling. The data, and engine design, support that you need better oil cooling which is achieved via the oil cooler.
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Originally BMW had neither oil cooler nor additional coolant radiator. 1st the added on oil radiator 2nd when that was not enough they added additional coolant radiator and stronger fan for the existing radiator and not one more oil cooler. Do you doubt the engineers? I don't
Quote:
Originally Posted by bNks334
Again, data does not support that the stock coolant system is an issue in the first place (for all but the most hardcore 30min+ track sessions). Yes, there is a place for improved water cooling, but only after you've tackled the engine oil temps which will throw you into limp mode long before the coolant ever gets "too hot."
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Only on AT as the coolant system is overwhelmed by cooling the engine oil and AT oil. People found rescue in upgraded oil coolers only because for a longest time upgraded coolant radiator for AT n54 did not exsisted, only for the MT n54. Now there are better coolant radiators for AT n54 and you know what? People that have upgraded those and left everything else as is do not experience issues. Why? Because no matter who you look at it coolant will remain the primarily cooling provider and everything else will be just a support.