Dave,
Might not be speed based fan control in the E38 or E67 (I haven't looked at all the code or all the OS's that exist for all of those ECM's to be able to make an across the board statement like that, one way or the other) but plenty of other earlier GM systems did have speed based control criteria. The controllers used with the Gen III GM V8 engines ("Warren PCMs") all had speed based fan control criteria available in the code and most of the vehicles had it enabled.
PSS
Quote:
Originally Posted by mikels
There is no speed dependency for fan control. Strictly based on temps vs. fan output %. ECT, EOT, TOT, IAT each have their own table - and highest request wins. What this means is say each input below with respective fan %:
ECT = 60%
EOT = 40%
TOT = 35%
IAT = 0%
Result will be fans driven at 60%.
You can access fan tables with HPT or EFILive.
Don't make mistake in assuming max fan % is only ~90% - so you should raise to 100%. PWM fan controllers have max output at some level <100% (depending on controller). Raising will NOT increase fan output, but can damage fan controller.
BTW- 280 is well within temp limits of synthetic oil, so will present no problems.
Dave
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