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We introduce a new chemical enrichment and stellar feedback model into GIZMO,using the SIMBA sub-grid models as a base. Based on the state-of-the-artchemical evolution model of Kobayashi et al., SIMBA-C tracks 34 elements fromH$\rightarrow$Ge and removes SIMBA's instantaneous recycling approximation.Furthermore, we make some minor improvements to SIMBA's base feedback models.SIMBA-C provides significant improvements on key diagnostics such as the kneeof the $z=0$ galaxy stellar mass function, the faint end of the main sequence,and the ability to track black holes in dwarf galaxies. SIMBA-C also matchesbetter with recent observations of the mass-metallicity relation at $z=0,2$. Bynot assuming instantaneous recycling, SIMBA-C provides a much better match togalactic abundance ratio measures such as [O/Fe] and [N/O]. SIMBA-C thus opensup new avenues to constrain feedback models using detailed chemical abundancemeasures across cosmic time.

SIMBA-C: An updated chemical enrichment model for galactic chemical evolution in the SIMBA simulation