I generated 10000 single-pi+ events (pt=5, -.8<eta<.8) with the following geant settings:

  dcay 0 (no decay)
  anni 0 (no positron annihilation)
  brem 0 (no bremsstrahlung)
  comp 0 (no compton scattering)
  hadr 0 (no hadronic interactions)
  munu 0 (no muon-nucleus interactions)
  pair 0 (no pair production)
  pfis 0 (no photo-fission)
  phot 0 (no photoelectric effect)
  rayl 0 (no rayleigh effect)
  loss 4 (energy loss without fluctuations)
  dray 0 (no delta ray production)
  muls 0 (no multiple scattering)
  stra 0 (no collision sampling)
  physi
  debug on
  **CUTS   CUTGAM CUTELE CUTHAD CUTNEU CUTMUO BCUTE BCUTM DCUTE DCUTM PPCUTM TOFMAX GCUTS[5]
     CUTS     1e-3      1e-3      .001       .001       .001        .001  .001      1e-3    .001      .001    50.e-6

These settings should turn off physics processes in geant.  The kumac used for this purpose, along with my fzd and root files, are available in /star/institutions/mit/wleight/noPhysics/.  After doing reconstruction (with perfect hits, no smearing), I plotted the Y and Z pulls for each Pixel layer, the IST, and the SSD.