Quote:
Originally Posted by cRiPpLe_rOoStEr
Depending on the proportion of fuel enrichment, it won't harm performance, it may actually lead to some improvement. On a sidenote, replacing the so-called inert gas with a gaseous fuel is more likely to decrease NOx, as it will decrease the amount of free oxygen molecules to reach with the nitrogen. A richer AFR is usually more likely to result on lower NOx, regardless of how the supplemental fuel is delivered to the intake tract.
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I think I wasn't clear. I meant replace EGR with a flow of propane and more air so it wouldn't enrich the air fuel mix, but rather keep it the same.