In regards to Question 2
" Question 2: I was intending to "notch" my bellhousing to make removal of the senaors bracket unnecessary in the future if removing the bellhousing. Can/should this still be done with the single sensor set-up?"
I am suggesting that it should
not be done on the S2 & 968 or any daily driver-DD 924S 944 series or 951. Track cars -----sure.
Previously....
It is a reccommendation that owners who have the the 924S, 944 & 951 cut the bell housing to avoid future difficulties with reference sensors that with age are rotted/frozen or by contamination, welded to the bracket and the difficulty of getting the sensor bracket off if the reference sensor breaks in half when trying to remove.
Porsche began using the sensor bracket "sleeve" to avoid the electronic interference of the use of the turbo starter electronic field when starting. The starters were causing hard starts & detonation without the "sleeve".
As mentioned in the TSB, Porsche did have a notch in some '87 models and went back to the original design with 2 holes for the sensors. In some models they also used 2 holes AND the "sleeve" (my 88 924S).
Porsche upgraded the bell housings to
have 2 slots for the reference sensors.
When I changed the clutch on the 88 924S, I left the bell housing intact.
When I changed the clutch on the 87 924S, I cut the notch.
I also got a Bosch re-manufactured turbo starter and installed. I do not find any difference in starting or any detonation before or after cutting the notch. The 87 924S did not come with the "sleeve". Maybe I am fortunate.
I would not cut the notch on another bell housing in the future.
What I would do...
I would not use the hex head pan bolts origninally on the sensor bracket. I would use the same length 13mm head bolt and coat with anti seize. I would use anti-seize on the reference sensor bracket pivot and rub on the reference sensors as well before installation.
GL
John_AZ