i install it on my 4g91 engine...if reach more than 1500..say like 3500...it will sound from starting 3500 untill drop to 1500...when u accelerate..it will not make a sound...after u release the padle then it will...from the begining of 3500 untill reach 1500...ill try adjust the top screw...but onli can until 1500 below..upper cannot...upper u cannot hear any sound
i dont understand what u are saying...
the sound will only come out if you're in between 1500-3000?
or NO sound from 1500-3000.. only after 3000 got sound ?