Wheatley Posted December 23, 2008 Report Share Posted December 23, 2008 (edited) you can bring your switch points down,or get a wideband and run open loop.I tune my 03 Tahoe in open loop SD (speed density) During a steady state cruise and flat terrain I have it at a 15.5:1on the highway My mileage increased to 19mph from 16.5 at a steady 75-80MPH When I get to inclines and more load is on the motor,I have it where the air fuel richens to a 14.7:1 until the terrain gets flat again.This works great You can also mess with your DFCO (deceleration fuel cutoff) some.Just be careful and do not overshoot hope this helps some Edited December 23, 2008 by Wheatley (see edit history) Quote Link to comment Share on other sites More sharing options...
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