Quote:
Originally Posted by serialk11r
Why would EGT be higher with DI? Higher thermal efficiency=lower EGT.
Why would catalytic converter "built for DI" be worse? Toyota claims reduced emissions due to just the DI system alone.
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Hmmm Im thinking that EGTs would be higher because air mixtures should burn be leaner (cleaner), but result of cleaner tailpipe emissions is super heated NoX. Or so i saw on those Lexus tech articles with the use of new proprietary DI o2 and catalytic technologies.
And they built a catalytic converter to strip down that NoX...but Iv never seen inside of it...so i really don't know how restrictive they are over normal cats.
But anway...higher thermal efficiency for air is usually richer mixture..or at least thats what iv witnessed with my rx7.
So that said...i dont think that the Direct injection is aiding thermal efficieny for tailpipe gases.