Both the No. 15 Rahal Letterman Lanigan Racing Honda of Rahal and the No. 4 Chip Ganassi Racing Honda of Simpson were hit with a six-position starting grid penalty for unapproved engine changes after last weekend’s 108th Running of the Indianapolis 500.
According to a release by IndyCar, the teams were in violation of Rule 16.2.3.2., which states:
