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- Mazda
I could summit my ASE write up as soon as I have another ASE proof check it for wording and technical information. hahahaha! I can tell you that most current DI engine will build carbon up and running them at higher RPM levels will not prevent that from occurring. We tested and scoped the intakes and combustion chambers of various platforms with DI and on my own MAZDA 2.5 I have been trying to find ways to lower the carbon that does form. At this point the water/meth injection pretty well stops it but the down fall is tuning for the new volumes of fluid going into the intake. PIA!!!!!!!!I will see if I can find the articles for reference but they alluded to even more direct injection buildup if you don't exercise a direct injected engine more often with higher RPM use.
I can say but have no data to confirm it yet the use of top tier fuels like Shell and Chevron and or genuine quality fuel system cleaners seems to effect a slight reduction in carbon formation in the combustion chambers only.