I just purchased tuner cats and a cable from akm. I'm new to tuning, but looks like there is plenty of info on the site to provide lots of help. I searched the threads, but could not find an answer to this question. In tuner cats 2.11 where the heck is the cooling fan constant? I see constants for turning the fans on at differnt oil temps (I don't beleive my LT1 even has an oil temp sensor), and different a/c pressures...but what about coolant temp? Obviously there has to be a constant for this, but why can't i see or modify it with tuner cats like everyone else has? Please help? Also, anyone have a proven tune that works well with my mods (see signature) that would be willing to email it to me? (jayjenny2@aol.com). Thanks in advance from anyone willing to help out a newbee to tuning!

 

Look in the middle column about halfway down. It has its own table now. I think it was changed in the last update to the definition files.

 

There is a table for fan enable coolant temp vs speed, but no table for setting the actual temp at which each fan comes on and goes off.

 

Those numbers are the temps at which the fans come on, they are in celsius.

you can use this converter to figure out what temperature to put in. http://www.stabb.com/tools/convert.html

 

I appreciate the feedback, but I must not be explaining myself very well. The table only has 4 boxes, and those 4 entries are mph...not degrees c. If you have the tunner cats program, pull up any tune and look for the table called fan enable coolant temp vs speed. it shows this:
Fan# MPH
low high
1 107.75 107.75
2 113.00 113.00
I can not find any table that shows fan on and off control based on coolant temp. If someone wants to take a look at my stock tune file, I will email it to you.

 

I can't get the table to display properly in the post for some reason...but the fan # column has the 1 and 2 under it, and the mph comlumns have the low and high mph values under them

 

That is the table to set fan temp. It seems strange to me too. If your tune is stock you should have 108 for fan #1 and 113 for fan #2 in the table. I think the low and high is to set the temp for low speed and another temp for high speed. I changed my temp before the new definition file in the constants table and it shows up in the new table now. The temp that I set shows the same for low and high and it goes out to .25 degree increments instead of 1 degree.

The numbers in the table are degrees celsius not mph.

 

Thanks....the way the table is labeled, it looks like the 107.75, and 113 are mph....confusing. so what are the 4 values in your table? Do you know of any sites where I can look at different tunes people have used with various mods? I would like to view the tables the hypertech programmers use, or even some of the tunes pcm for less uses. Thanks for all of your help.

 

http://www.bfranker.badz28.com/LT1Edit/LT1files.htm

Youl'l need tuneconv to convert lt1 to bin

 

I haven't figured out exactly how it works for sure, since there is a difference how the fans work depending on the year it's kind of confusing. Early cars had their fans run at only one speed (high), but they could turn on individually.
Later cars could run their fans on low rpm or high rpm, but not individually, both fans had to be doing the same thing, both off, both on low rpm, or both on high rpm.

Earlier cars had fan 1 come on a certain temp and then fan 2 come on at a higher temp. Later cars have fan 1 and fan 2 come on low speed (fan RPM) at a certain temp and then at a higher temp they both bump up to high speed (fan RPM).

There is a setting in the ECM Constants Table called Fan Threshold High Speed (MPH)

So the way I think it works in the Fan Enable Coolant Temp Vs. Speed table is this:
The two numbers in the "Low" column (Low is referring to MPH, not fan speed) labeled "1" and "2" are the temperatures in Celsius that activate the respective fan.

Fan 1 is literally Fan 1 and Fan 2 is literally Fan 2 on the older cars. On the newer cars I believe Fan 1 to mean "both fans turn on low rpm" and Fan 2 means "both fans turn on high rpm".

Now, if you go to the ECM Constants Table called "Fan Threshold High Speed (MPH)" and enter a value (in MPH) then the two numbers in the "High" column control the fans in the same manner as the entries in the "Low" column. They just do it when the MPH of the car exceeds the value entered in the ECM Constants table.

I hope that make a little more sense, I could be wrong about some of this. If anyone can explain it better of point out any thing that is incorrect please chime in.
, then column two affects the fans in the same manner as column

 

Actually TunerCats can open .lt1 files, when you click Files>Open then you get an explorer window to locate the file you want to open. At the bottom of the window is a box labeled "files of type", by default it says "Binary Files (*.bin).

Use the drop down arrow to select LT1 Files (*.lt1) or All Files (*.*) then you can see the .lt1 files and open them.

 

Tanks to everyone for your help!