97grnrs

i did this on my eclipse and it worked nice.. i did not need a ML or anything so i wanna try it on my civic.. but how can i test what the max voltage my map sensor needs to see so i dont set this device too low. do i just turn on the car and probe the signal lead of the map and mess with the throttle or what ? heres the link to what i have built. http://www.fwdmopar.com/sites/dennis/howto.html and also is a ML or this even necessary? cause on my car im only usin a stock ls ecu and an fmu and stock injectors and it runs fine when crossing from vac to boost and it dont throw a code or anything but i am running too rich so i was wondering if when the map sees boost it just makes car dump more fuel or something even though its not throwing any codes .. and sometimes after hard boost the idle will drop real low to like 3-400 instead of 8 where i have it set at.