Or in this case... when you jet too lean.
It's not necessary, but I'm going to share my lesson with you all, save you some time and money this way.
I typically run 91 with a bottle of Lucas octane boost on the street and 100 sunoco at the the track....not this time. First run was shit, garbage reaction almost half a sec....left okay..but spun in 2nd and peddled for 8.0 in the high 80's.
Track is just over 2000ft, it was a hot dry day... I run one jet'75' under stock'76' @500 ft ... I...
When shit hits the fan