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I recently bought a Versatuner and have begun to play with it. I had purchased it to alter the fan settings, optimize the dwell settings for the LS2 coils and eliminate catalyst related CELs. I found that once I got in there, I needed to do some interpretation with regards to ECT sensor voltages. Mainly, I needed to translate the voltage output by the sensor into usable temperature correlation. So, I went through the factory ECT calibration data and copied that into excel and went to work. I made a quick table to show the factory on/off temps and voltages, then what I changed my car to. I interpolated the factory data set in order to get a little more resolution into the factory voltages because the factory data set jumped in 20 degree increments.
Here is the table for the on/off settings:
relay 5 is for the key off fan on settings that series 2 uses to cool the engine bay if the ECM sensor sees too high of a temperature and I didn't alter it. Below are the engine coolant temperature voltages correlated to the coolant temp in F. The yellow block are the ones I added.
I tested these settings on my car here in the Phoenix heat, and now once the coolant gets to 207F, the fans ramp up and the temps drop back to 202 within 30 seconds. I'm happy with this setup, although with ambient temperatures in the 107F+ range couple with AC usage, the stock cooling system seems to struggle to combat the temperatures. Hope this data helps someone.
Sorry to reply an one year old thread... But I am also planning to buy a Versatuner to optimize the fan settings considering I saw my S2 ECT heating up to 220F quite fast during NorCal summer trackday sessions. I would like to figure out what table/value exactly I should change and program before I pull the 'ORDER' trigger. I have couple of questions regarding the fan control settings from Versatuner and really appreciate if you can share your understanding of them.
After Run Fan Relay PCM Temperature Trigger Off/On (1D)
Fan Relay 1 Coolant Temperature Trigger Off/On (1D)
Fan Relay 2 Coolant Temperature Trigger Off/On (1D)
Fan Relay 3 Coolant Temperature Trigger Off/On (1D)
Fan Relay 4 Coolant Temperature Trigger Off/On (1D)
Fan Relay 5 Coolant Temperature Trigger Off/On (1D)
Primary Fan Temperature (1D)
Secondary Fan Temperature (1D)
Secondary Fan Vehicle Speed (1D)
However, your post shows that your successfully lowered the fan on temperature by modifying only the On/Off values of Fan Relay 1/2/3/4. My question is that how about all other values? Like, On/Off of Fan Relay 5, Primary Fan Temp, Secondary Fan Temp and Secondary Fan Vehicle Speed? Are they just dummy parameters that has no actual impact on fan on/off settings?
It is quite surprising that the change worked without modifying Fan Relay 5 On/Off value because accroding to the S2 service hightlights (attached below), both Relay 4 and 5 needs to be on in order to have the fan on High Speed. The assumption I made here is that the parameters of Fan relay 1-5 from Versatuner matches the actual Relays 1-5 in the vehicles fan control circuits.
Just realized you have already mentioned that relay 5 is for key off fan on settings... I was definitely not paying attention when reading lol. Now I think I kinda understand how this thing works in VersaTuner. I could not help myself match those relay parameters to the actual relays in the circuit when I first saw those parameters..
07-12-2020, 01:34 PM
Fan control data
