Quote:
Originally Posted by Kodename47
This could explain why it goes lean after the rich dip, not why it reads rich. The sensor won't see the fuel in the exhaust. It's also highly unlikely at low RPM that there is enough vacuum to pull the charge straight through the cylinder, this is where the load logs will be of some use. Those logs show a dip in VE where these fluctuations are happening so it's not a sudden vacuum. Also, most of the fuel is provided by the DI. There is a much lower possibility (almost impossible?) of this being blown through the exhaust valves.
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Coming back to this quote. Would increasing the GDI firing angle help prevent if indeed some of the charge goes straight through?
Or would injector ratios play a part in the selection of firing angle?
I noticed in the stock MY17 tune that GDI firing angle at e.g. 3600 rpm has been increased from 300 to 320 and 4000 rpm from 300 to 330.
Except for the area where the ratios have been changed the rest of the table is virtually unchanged?
Given that I have almost the same injector ratios as the MY17 (and OTS doesn't) I'm tempted to try to increase the 320 values to 330 from 4000 and load 0.8 and up and see what it does...
My (OTS) injector values vs. stock v.s. MY17:
