I have the X3 tuner with 3 custom tunes from Doug @ Bamachips. When I got the tunes they were for 3.31 gears and now I have changed to 3.73. To change the gear ratio you have to go to the custom tunes and it asks if you want to change options. You select yes, then it gives the options for fuel, shift firmness, rpm limit, gear ratio, etc. All the options like fuel, shifts, show 0 and gives the option to + or minus. Is this changing the custom settings or the factory settings? So if I go into the 93 performance tune and change gear ratio to 3.73 the change the shift firmness +4 then is this changing Dougs settings +4?

 

I spoke with Doug regarding this exact issue. Yes, when you change a setting,
it's changing the current setting (his setting).

 

JUst to make sure I'm correct, if I change the shift firmness in the 93 performance tune +5 then I'm adding +5 to what Doug already has put in the tune?

 

Yes. Let me tell you my experience. I tried to change the shift point in Dougs tune
for my AT. He has it shifting at 5900 RPMs. So, I changed the WOT shift point to
+2, mph then tried +4 mph and saw no difference. Maybe that section is locked, I don't know.