AÂ basemap is a starting calibration used to get an engine running safely enough to begin the tuning process.
It is not the same thing as a fully tuned calibration.
A basemap is usually built around the basic details of the setup, such as:
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Engine
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Injector size
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Fuel type
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MAP sensor
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Naturally aspirated or turbo setup
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VTEC configuration
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Basic rev limit
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General engine modifications
The goal is to give the engine a reasonable starting point so the vehicle can be started, checked, and datalogged.
Is a Basemap Safe to Drive On?
A basemap may be close enough to start and move the vehicle, but it should not automatically be treated as a finished tune.
Every engine behaves a little differently.
Fuel pressure, injector condition, engine condition, sensor readings, mechanical differences, boost level, and other factors can all affect how the engine actually runs.
That is why datalogging is important.
Once we can see the engine's actual air/fuel ratio, load, RPM, sensor readings, and other data, the calibration can be adjusted specifically for that vehicle.
Basemap vs Custom Tune
A basemap is a starting point.
A custom tune is built around the specific setup and can be further refined through datalogging or dyno tuning.
For example, two cars may both have:
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B18C engine
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1000cc injectors
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Turbo
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4-bar MAP sensor
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E85
That does not mean both cars will require the exact same fuel and ignition settings.
The basemap gets the calibration in the right general area.
The tuning process is what actually dials it in.
Can I Go Wide Open Throttle on a Basemap?
We do not recommend doing full-throttle pulls on an unverified basemap unless specifically instructed during the tuning process.
Before increasing load, air/fuel ratio and other important engine data should be checked.
A basemap should never be treated as permission to immediately make full-boost or high-RPM pulls.
Why Do Tuners Use Basemaps?
Starting from a basemap saves time and gives the tuning process a proper foundation.
Instead of starting with completely stock ECU settings, the calibration can already be adjusted for major changes such as:
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Larger injectors
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Boost
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Different MAP sensors
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Engine swaps
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Different fuel types
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Modified rev limits
From there, the tune can be refined using actual data from the vehicle.
The Simple Version
A basemap gets the car started and close.
A finished tune gets the car dialed in.
If you are using a basemap as part of a remote tuning process, follow the tuner's instructions before making higher-load or wide-open-throttle pulls.
DGTune specializes in Honda and Acura OBD1 ECU tuning, chipped ECUs, ECU socketing, and remote tuning.