I know few on this forum uses Racechrono for datalogging.
QStarz recently released a 10hz model, BT-818XT for under $100.
LINK
Would be a nice upgrade to get more data resolution for lap time comparisons.
Alan
94 Miata R package RPF1 195 RS-R RB FSB FCM Bilstein Ebay Coilover 550/350
91 Civic Si Daily Beater
"Its more fun to drive a slow car fast, than it is to drive a fast car slowly".