bellacotim

My commute puts me in a log traffic jams and I don't like how the car ends up cycling between 205 and 195 *F. I want to bring that down 10 degrees.

Has anyone found the tables that will let me fiddle with the Evo X's cooling fan engagement temperature? Looking at the schematic, the fans are wired to run in series (low speed) or in parallel (high speed), depending on condition of the three fan control relays. So there should be two engagement temperatures to play with.

RS200Z

Golden probably have the answer...

http://www.evoxforums.com/forums/sho...21&postcount=4

bellacotim

Yes. I've played with this table, but they didn't do anything for me. I've even tried setting the entire table to 100%, but that still no affect on the fan engagement temps. These tests were performed while parked with engine running, A/C off. Maybe these tables are referenced only when other conditions are met that I'm not satisfying. Maybe there are other tables?

domyz

iTrader: (6)

Our thermostat tends to stick slowly/crack open when it starts to fail. I would look into that. And under 205F you're okay, absolutely no rush to mess with these tables.

bellacotim

Car runs fine. I just have a touch of OCD. I daily drive and deal with lots of traffic. I found a long time ago from experimentation and logging that if I switch on A/C controls whenever I'm stuck in traffic, both fans kick on high speed and the car maintains consistent temps of around 192 F. Well then, how about I additionally pulled my A/C compressor clutch fuse to prevent A/C compressor clutch engagement. No compressor sapping engine power and avoid introducing additional heat from physics of refrigerant condensation. From this, I got even lower temps -- steady 185 F. One side-effect though is with A/C is set to "on" ECU runs engine in idle up mode, something I'd like to avoid. BTW, I'm not concerned with how this affects fan life -- they're pretty cheap.

Here's a plot from a data collection displaying coolant temp along with vehicle speed. I want to get these results using the tables instead of the ghetto A/C hack and deal with all the silliness that comes with it.

I know the good engineers at Mitsu say it's OK to let the car heat cycle like that, but if you can get these demonstrated consistent temps, then why not explore? Also, this could be a good way to cool down in the paddocks after track sessions.

bellacotim

Hi guys,

Merry Christmas, and please enjoy this little stocking stuffer. I've been trying to get a handle on how/when my cooling fans turn on, mostly to keep the temps stable during traffic on my commute. I've managed to discover this thermo fan temperature tables, and tweaking the values has proven effective. The table axis descriptions should be pretty self explanatory.



Here are two logs superimposed. Car comes to a stop and is left to idle. Red is the stock fan cycle, blue is modified.



To add this to ECUFlash, you'll need to define new scaling factor for 1byte temperature, either in Evo10base.xml or directly in your particular vehicle's metafile.

Then add this blurb to your vehicle specific ROM:

For 52680015,
For other model years, copy the above but tweak the table address to suit your ROM.

For 55570005_2010_UDSM_5MT, modify above code to read: address="5643E"
For 56890009_2011_USDM_5MT, modify above code to read: address="5643E"
For 58010005_2012_USDM_5MT, modify above code to read: address="56456"
For 59590004_2013_USDM_SST, modify above code to read: address="56456"

richardjh

Nice! Thanks very much.

Rich