The RA100E utilized the first type of butterfly throttle systems on F1 power-plants. The same principal is used in production cars such as the Dodge Viper, Toyota MR2 and Mercedes AMG machines. The RA109E suffered from ingestion vortices in the lower power-band due to the conventional slide type throttle used. The use of a butterfly throttle calmed the ingestion of combustion gas allowing for improved drivability.
The RA100E helped McLaren-Honda fend off Ferrari in the 1990 World Championship leading team Mclaren-Honda and Britain to the top of the charts and a spot in history.