I can never get my SSEi to burn rubber really...it always retards my timing....even after the new chip ...are you holding down the emergency brake during the burn out?
You should read my thread in On the Road and Track....
So, I assume from the thread that you used the parking brake but that the computer, sensing that it is on and you are driving, will pull timing to try and slow you down and save your parking brakes.
Disconnecting the parking brake sensor will fool the computer into thinking that it is not set.
....still don't understand the rear wheel speed sensors though.....