Use a momentary switch, with the IAT sensor deal. So when pushed in, see's no reading. Then use the IAT table to drop you timing down to nothing.
No timing, car won't be making power, so can build up boost. Then let go of the button when you let off the brake.
I have my PCM setup to where regular timing tables are setup to drop timing in a certain RPM range and PEvsTime table to richen up the fuel, to kick turbo some in the ass.
Worked well on my 3000 stall, stock brakes, and small booster.
I can launch at 10psi now... But the method I use, with no switch, leaves me a small window to launch in.. to low of an RPM.. and it bogs... to high of an RPM, and car lurches forward and
will just smoke show the tires...
