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90 daytona 2.5 turbo

large front mount intercooler (19" x 14" x 3.5" core, 2.5" inlet/outlet)
hybrid T3/T4
grainger set to 13psi
stage 3 fwdperformance computer
otherwise BONE STOCK

at full throttle OTC indicates less than 3 degrees retard on cylinders 1 through 3, (some are zero, or 1, highest I saw one one was 3), but I saw 7 degrees on cylinder #4

no audible knocking

what is normal? what does all this mean?

i have an EGT gauge installed on cyl #4 exhaust runner 1.5" from head

engine DID AUDIBLY DETONATE without intercooler, at 7+ psi
 
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