Quote:
Originally Posted by dannichols1474
Part 7
With the mechanical work done it was time to start the software side of the project....
I also entered the ignition advance data I collected from the stock set up into the Ignition Table.
The VE, AFR and Ignition Timing tables are from after the dyno tuning.
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Hi Sal,
The answer to your question is yes - the old mechanical advance had more timing than optimum at WOT and all high loads.
The above graph shows, amongst other things, the ignition table for the stock 2.7L motor with ITB EFI after dyno tuning.
The 2.7L stock engine has a CR of 8.5:1 and MBT at 6500rpm / WOT is 29.1 degrees.
The rebuilt 2.8L engine has a CR of 9.8:1 and MBT at 6500rpm / WOT is 28.8 degrees.
So as expected, the timing needed comes down as CR goes up. Also, timing needed goes down as load goes up in line with what I have read in tuning literature.