[Diy_efi] sequential injection timing

[Kent Martin]

Does any one know at what angle you should start fuel injection
in a sequential injection arrangement. I would have assumed 
that you would start injection just before or when the intake begins 
opening. I had a look on my car and found that they started injection 
somewhere around 70 or 80 degrees before TDC. The valve is not
open at this time, why do they do it then?
This was measured at idle, and they might have been timing it so at
maximum load the injection finished when the valve was closing at the
expense of spraying on a closed valve at lower loads. Does anyone
have an explanation for this? What are the advantages and disadvantages 
of different injection start times?
Kent.



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