Quote:
Originally Posted by serialk11r
I think you can't mess with the piston shape with D4-S, they don't use stratified charge but the piston is shaped so the direct injector + port injector create a very even distribution of fuel in the cylinder. If you remove the piston shape, don't expect the performance to stay the same; uneven AFR will promote detonation and poor combustion.
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D-4S on the 2GR absolutely uses a version of stratified charge for cold start. PI is used on the intake stroke, and DI is used on the compression stroke. toyota calls this "weak stratified charge".
the dish in the piston has little to do with D-4S, because other cars without D-4S have the dish as well.