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Hondata S300
Hondata S300
Hondata S300
Hondata S300
Hondata S300

Hondata S300

  • Serial output for dashboards like the AiM MXL and Racepak IQ3 - (needs 230-vmefi-hond)

  • CAN output

  • 2-4 times faster datalogging

  • Bluetooth technology for laptop programming/datalogging and mobile datalogging

$590.00 $595.00 $595.00 /
On Backorder Only Available Available 40+ in stock Available


The Hondata s300 Version 3 is a plug-in module for the OBD1 factory Honda Engine Computer (not included) for manual transmission vehicles that vastly expands the capabilities of the factory ECU. Forced induction, data logging, real-time programming, Bluetooth, and engine protection are but a few of the comprehensive s300 features. It was designed, manufactured, and assembled in the USA.

The S300 uses SManager software for tuning and data logging. Warning: Within the USA, this product is legal only for racing vehicles, which may never be used on a public highway.  

  • Ethanol content sensor support
  • Bluetooth technology for laptop programming/data logging and mobile data logging
  • 2-4 times faster datalogging
  • CAN output
  • Serial output for dashboards like the AiM MXL and Racepak IQ3 - (needs 230-vmefi-hond)  
Real-time Update

The s300 can be updated in real-time with the engine running without affecting the vehicle's operation.  This means calibrations and changes can be uploaded to the ECU very quickly (2 seconds for a new calibration, a fraction of a second for anything else) without interrupting the engine's operation.  Changes made in the SManager software are uploaded to the ECU instantly, and you can see the effect immediately.  The s300 does not use an EEPROM or equivalent, so you never need to open the ECU to change chips or 'burn' ROMs. No EPROM programmer is necessary - you need a laptop with a USB port or Radio technology capability.

Data logging

The s300 has datalogging to the SManager software built in via the USB or Radio technology. Using a laptop or mobile device the various ECU sensors can be data-logged, viewed, graphed and saved for later analysis. Additionally the s300 has on board flash memory which allows a datalog to be made without a laptop, for later access and download.  Multiple recordings can be made and stored in the s300 for a total of around 120 minutes of total datalogging time. An external switch can be used to start and stop recordings, or engine conditions can trigger recording. For instance in a drag race, the s300 can be set to start recording once the rpm is bought up to near launch rpm and automatically stop once past the traps and the rpm drops below a certain level.  
1994-2001 Acura Integra
1992-2000 Honda Civic
1992-2001 Honda Prelude
There is no warranty stated or implied due to the unusual stress placed on competition product(s) and/or the inability to monitor their modification, installation, and use, unless otherwise stated. In such case, Hondata warrants all products to be free of defects in materials and workmanship for normal use and service for a period of (30) days from date of retail purchase. 

As of September 01, 2018, the warranty on these specific Hondata products is extended to one year from the date of retail purchase: s100, s300, KPro, FlashPro, Coil Pack Retrofit (CPR), excluding: Harnesses 
(For any issues with 4 or 7 bar map sensors, the end user must contact us directly for further instructions.)  

*This will still need to be approved by Hondata Management. State and Federal laws may supersede this. *  

Parts returned must be determined by Hondata to be defective before any warranty credit or replacement is issued. Hondata’s obligation under warranty shall be limited to repairing or replacing, at its option, any part proven defective. The customer must prepay transportation charges. Final determination of the suitability of the products for the use contemplated by the buyer is the sole responsibility of the buyer. 

Products purchased from unauthorized dealers, or with the serial number missing, removed, or altered, are not eligible for warranty service. Proof of purchase, in the form of an invoice or sales order, may be requested. 

Hondata shall not be liable for any special, direct, indirect, incidental, or consequential damages, that might be claimed because of the failure of any part, including claims for delay, loss of profits, or labor. Hondata shall not be liable for any damage or injury to persons or property resulting from improper installation or misuse of any part subject to this warranty. There are no other warranties expressed or implied extending beyond those set forth above. 

All software must be used in accordance with the respective software license(s). 
Some products are not legal in California for off-road vehicles only and should NEVER be used on public highways.