OMEM710 Hardware Manual 2v11
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value as it will trigger fuelling changes that are not needed. The delay after engine start before
starting oxygen feedback is set in the OX FB Delay Table.
15.2 Wideband
When mapping an engine on a rolling road or engine dyno it is normal to use a wideband lambda
reader that is totally separate to the ECU. However, some tuners prefer to see the lambda value on
the mapping software too for easier reference or for datalogging purposes.
The lambda reader should have a 0-5V output available, and the lambda reader’s manuals should
give the lambda value for each voltage. The ECU scales the incoming voltage of 0-5V as 0-256 in
the OX sensor table. Enter the relevant lambda values into this table, then the lambda can be
constantly monitored by parameter lambda1. The output from the lambda reader is usually a
straight line relationship, so just the 0 (0V) value and the 256 (5V) value can be entered, then the
values in-between calculated by MAP4000 (see the software manual for how to calculate on tables).
Ensure that the lambda feedback is OFF when the wideband input is being used for logging by
setting OX FB rate = 0.
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