If you look at the IAM value, if it's not at 16, you've had a knock. Also, depending on the tune it may pull only a degree of timing or even more in the event you get a knock. Just depends on how it's tuned.
Also, intake temps do play a big part on the performance of the car. If you want proof, find a nice cool day with low humidity, make a pull in 3rd. Then wait for an unbearably hot and humid day, make a pull in 3rd. Guess which one is quicker. The colder your intake air, the denser the air and the bigger the bang.
VF34'd Corvette Killer aka Doug