Boost is generally not a good parameter to use for triggering the WI. I would consider using the ACT (air charge temperature), post-blower, reading instead. ACT is directly responsible for detonation. In my experience (and this becomes engine specific based on combustion chamber shape and engine assembly measurements), an ACT of over 200* F is starting to get borderline. Additionally, note that a centrifugal type of blower at 15 psi may produce ACTs of 180* F whereas a Roots style blower at 15 psi may produce ACTs of up to 280* F, simply because of the inherent difference in efficiencies of the blower types.
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'71 Mustang - C90E 408W @ 9.6:1 CR, N/A
'89 5.0L Mustang: Dart block based 2.2L Blowzilla supercharged combo @ 8.5:1 CR
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