LS motor with stock computer and stock coils. I have 4150 style big shot plate that I progress thru 1st gear. I want to put a 2nd plate on the car that turns on in high gear. I use a LNC2000 to pull timing for my first kit. Do i just buy another LNC2000 or what options do I have? if I buy another one how do i wire it to pull additional timing off the already pulled timing? I really dont want to run the car with all the timing pulled for the combined kits right off the bat. maybe it wont be that bad I'm only adding another 100 shot on top of 225. Whats the best way to do this?

 

Try the iat resister trick with an additional relay. Just google iat timing tricker. Use the iat method for first stage and lnc for the second. Do u do your own tuning? Might be best to and pull timing on your own.

 

EFI Live COS#5 and have the pcm pull timing when the 2nd stage cuts on.