Timing on a blower car?
wideband (portable) for street, get it dialed in and lay low on the boost, but do PART throttle the boost to ensure open loop kicks in any time boost is present.
Then take to dyno. You can do it opposite, but no matter what a boosted car has to be portable-wideband tuned, unless you plan to live a 1/4mile at a time..
Closed loop+Part throttle+boost = icky.

