A Hondata system consists of additional components which are added to the standard ECU to allow the ECU to use a Hondata program (this modification is normally done by the dealer). An interface box is then connected to the ECU which contains circuitry for datalogging, stores rev limits and interfaces to switches in the vehicle. Optionally a clutch switch, push button and datalogging cable may be installed. Collectively all this is known as a Hondata system.


The s100 offers the same tunability as the s200 without the additional options (datalogging, 3-step) that the s200 offers.
 
The s100 system has the following features:
Fits inside the ECU. No external wiring.
Speed limiter removed (if applicable).
Tunable fuel and ignition tables.
Expanded fuel & ignition tables for boost.
Expanded rpm fuel & ignition tables.
A/C cutout.
VTEC control (non user adjustable).
Rev limiter (non user adjustable).
 
Ecus supported by hondata s100/s200:
92-95 Honda/Acura OBD1 ECUs only.
USDM Vtec: P28, P72, P61   JDM Vtec: p30, p72, p08, p27, pr3, p91  
USDM Non-Vtec: P75, PR4, P05, P06
*Hondata can be used in OBD2 96 and newer vehicles with OBD jumper harnesses.