UberData is a legacy Honda OBD1 ROM editor. This article preserves its archived setup and tuning FAQ while identifying its example values as historical guidance rather than a ready-to-run calibration.

Warning

The example settings in this archived FAQ are not a safe tune for every engine. Verify ROM compatibility, use suitable instrumentation, and tune under controlled conditions.

Hardware Requirements#

The original FAQ specifies a 1992-1995 OBD1 Honda Civic or Integra ECU and lists these socketing parts:

• Resistor: 1/4 W, 1 kohm
• Capacitors: Two 0.1 uF ceramic disc
• Address Latch: 74HC373
• Socket: 28-pin ROM socket
• ROM: 28-pin EPROM (e.g., 27C256)
• Programmer: Compatible ROM programmer

Socketing Procedure#

1. Desolder the component holes.
2. Solder a 28-pin socket into the empty ROM footprint.
3. Solder in the 74HC373.
4. Solder a resistor into R54 (Note: Not required on USDM P72 GS-R ECUs).
5. Solder 0.1 uF capacitors into C51 and C52.
6. Install the J1 jumper.
7. Insert the ROM in the correct orientation.

Caution

Installing an EPROM or EEPROM backward can overheat and damage it when power is applied. If a new error appears after socketing, test a verified stock bin and inspect the soldering. Cutting J1 returns the ECU to stock code.

For a broader hardware guide, see Introduction to ECU chipping0.

Baseline Bin Suggestions#

Important

These are legacy UberData examples. Confirm that a baseline matches the ECU code base, hardware, injectors, sensors, and engine before using it.

Map Definitions#

The archived FAQ describes the UberData grid as follows:

• Y-axis: Engine speed in RPM.
• X-axis: MAP-derived engine load.
• Vacuum: Displayed in inches of mercury (inHg).
• Boost: Displayed in psi.
• Fuel Map: Higher values command more fuel.
• Ignition Map: Values represent degrees before top dead center (BTDC).

Note

The statement that injectors max out at a fuel value of 800 is software-specific and does not establish actual injector duty cycle.

Boost Column Configuration#

Stock ROMs do not automatically populate the boost side of fuel and ignition maps. The FAQ suggests these calculator examples:

• Boost Average Efficiency: Set to 120% to generate fuel values.
• Boost Ignition Retard: Set to 1.0 degree per psi to generate ignition values.

Warning

These are archived software examples, not universal safe settings. Required fuel and ignition values depend on the engine, fuel, compression ratio, intake temperature, boost, and other conditions.

Rev Limits and VTEC#

1. Open the Rev Limits tab.
2. Set Fuel Cut to the desired rev limit.
3. Set Fuel Resume approximately 100 RPM lower.
4. Set the VTEC enable and disable RPM values.
5. Apply the changes.

Full Throttle Launch#

Full Throttle Launch uses a lower rev limit below a configured vehicle speed.

• Fuel Cut: The launch RPM.
• Disable MPH: The speed at which the launch limiter deactivates.

Idle Adjustment#

Idle speed limits are adjusted under the Misc tab. For IACV frequency issues:

• Low-idle: Move the frequency setting left.
• High-idle: Move the frequency setting right.

TPS Enrichment#

TPS enrichment adds extra fuel during rapid throttle opening. The FAQ suggests this scaling for injectors larger than the stock 240 cc/min:

starting_percent = (240 / new_injector_size) * 100

Add 5% to 10% to the result (e.g., ~65% for 450 cc/min injectors).

Note

This rough example does not account for injector dead time, fuel pressure, voltage compensation, or nonlinear low-pulse behavior.

Fuel Map Scaling#

To scale a fuel map for larger injectors, select the entire map and apply a multiplier:

multiplier_percent = (240 / new_injector_size) * 100

Add 5% to 10% to the result to account for non-proportional behavior at low pulse widths. Verify all results with measured wideband data.

Related#

• Introduction to Honda ECU tuning0
• Understanding fuel and ignition maps0
• Injector sizing0