  Using the well known quantum hadrodynamics (QHD), we study the effects of
meson-hyperon coupling constants on the onset of hyperons in dense nuclear
matter. We use the SU(3) symmetry group to fix all these coupling constants,
constrained to experimental nuclear matter results and astrophysical
observations. While the discovery of massive pulsars PSR J1614-2230 and PSR
J0348+0432 points towards a very stiff equation of state at very large
densities, results from heavy ion collisions point in opposite direction for
densities below five times the nuclear saturation density. We study some well
known parametrizations and see that most of them cannot satisfy both types of
constraints. Indeed, although in our model we can simulate a 2.25 $M_\odot$
hyperonic neutron star, the heavy ion collision constraints limits the maximum
mass around 2.06 $M_\odot$.
