XDF table for waterpump management with aftermarket radiator?

[cloud9blue]

Quite a few of us with aftermarket radiator has been noticing that takes a lot of effort for the car to warm up on a really cold days, especially on the highway with a lot of airflow through the engine bay. This thread on N54tech described the problem pretty well: http://www.n54tech.com/forums/showthread.php?t=35394


My guess is that the DME is allowing too much flow through the more efficient aftermarket radiator. Doesn't seem like a stuck thermostat for me, since the car warm up as long as it is not crazy cold out there (like sub zero of single digit F) or I stick to mostly city driving with doesn't allow tons of airflow through the radiator. Just wondering anyone has any idea what's the duty cycle settings for water pump in low-temp operation and has anyone discover the tables for waterpump speed so we can adjust it through reflashing the car?


Or is taping up the front grilles with masking tape is the only viable solution for now, which is what I have been doing so far for the last few weeks...

[NniftyFour]

@jyamona@motiv did anything come of that thread where (someone) found a temp toggle for one of the cooling modes. And was able to lower the target.

[bradsm87]

The water pump should operate in closed-loop mode with a target temperature when driving pretty easily. There are a handful of tables which may or may not help this. There's the water pump map-based operation table but my interpretation of that table is that it's for wide open throttle/open loop mode. There are also thermo fan factor tables which tell it how hard to run the thermo fan for a given situation. Are you IJE0S?

[cloud9blue]

The water pump should operate in closed-loop mode with a target temperature when driving pretty easily. There are a handful of tables which may or may not help this. There's the water pump map-based operation table but my interpretation of that table is that it's for wide open throttle/open loop mode. There are also thermo fan factor tables which tell it how hard to run the thermo fan for a given situation. Are you IJE0S?

Yep, IJE0S running MHD pump backend flash for the winter. I would guess the water pump should be in closed loop mode as well, but my guess the minimal pump speed set by the DME is still too much for cars with aftermarket radiator in freezing temp.

Found the posts regarding the waterpump/thermostat control. http://www.bimmerboost.com/showthrea...398#post677398

Not very conclusive at the moment, seems like we need to discover more tables for this to be truly useful.

Taping up the kidney grilles is not the end of the world for me lol. Just look a little retarded though.

Also, I believe the stock oil thermostat allow small amount of flow to pass through even in closed position I believe. So if you have aftermarket oil cooler, your oil temp will take some time to warm up as well. But that can be easily solved with an aftermarket thermostat.