Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - dual injection is just a long overdue solution to carbon build up?

Ryephile · 11-07-2011, 04:19 PM

NOx levels rise as AFR goes lean, it's not related to the style of fuel injection.
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The carbon deposition problem on GDI engines is due to EGR and/or PCV routing "dirty" air through the intake and the gasoline not being injected far enough upstream to perform its wonderful solvency and wash away the deposits. Gasoline is a fantastic solvent; it doesn't need over-marketed "additives" to significantly improve is ability to clean.

The best solution for GDI engines is to not have either PCV or EGR; then the only source for "dirty" air is whatever gets through the air filter.

So yes, Toyota's D4-S is just a band-aid for being legally stuck having to keep PCV on the car from the factory. Damn red tape.

11-07-2011, 04:19 PM	#2
Ryephile Hot Dog Join Date: Apr 2011 Drives: quicker than arghx7 Location: Metro Detroit Posts: 1,316 Thanks: 103 Thanked 173 Times in 83 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	NOx levels rise as AFR goes lean, it's not related to the style of fuel injection. __________________________________________________ ____________________ The carbon deposition problem on GDI engines is due to EGR and/or PCV routing "dirty" air through the intake and the gasoline not being injected far enough upstream to perform its wonderful solvency and wash away the deposits. Gasoline is a fantastic solvent; it doesn't need over-marketed "additives" to significantly improve is ability to clean. The best solution for GDI engines is to not have either PCV or EGR; then the only source for "dirty" air is whatever gets through the air filter. So yes, Toyota's D4-S is just a band-aid for being legally stuck having to keep PCV on the car from the factory. Damn red tape. __________________ "Wisdom is a not a function of age, but a function of experience." Just Say No to unqualified aftermarket products.