i just bought a forward motion wastegate and i installed it and its suppose to hold like 15psi to redline but mine is spikeing 17 and dropping to 10 whats wrong and how do i fix it

 

this isnt unusual, if u dont have a boost controller u mite want to get one. then set the wastegate for 12-13 and control the boost with the controller. or else you have a boost leak somewhere so u mite want to tighten up ur clamps.

 

tighten what clamps

 

on all the lines, your piping (where it connects to the turbo, where it connects to the i/c, where it connects...) you get the idea there? the can work loose and cause a boost leak