[AndrewCologne]

Hi Walt,

additionally regarding the vacuum connections of the throttle body of the SC with 930.16 engine usable for map sensoring ...
I correct my statement above that the lower connection on the throttle body front for the ignition retard of the dizzy can't be used for MAP sensoring as directly when accelerating from idle the vacuum drops to zero, which would mean a full load which would be useless. This vakuum does exactly what its meant to be: lettng the dizzy move to approx 5° ATDC only at idle at factory state. So when leaving idle it does not affect the ignition advance and therefore the engines preformance.

The vacuum connection which actually can be used for map sensoring is the lower one on on the back side of the throttle body. Here as factory default the hoses for the deacceleration valve and the cruise control are connected via a T-connector. Just unplug the hose of the T-connector if no cruise control or the function of the deacceleration valve is needed and put on a separate hose to connect to a MAP sensor. I used the hose of the dizzys retard connection and sealed its open connection of the throttlle body using a plug.


As you can see below at idle and approx 800-900 RpM it provides 45 kpa which is optimal. If more kpa's do result, then its an indicator for an existing false air leak between the throttle butterfly and combustion chamber. On the right of my application you can see the kpa/load, below the RpMs and the advance.
The load based table on the left will be included with their values the next days and here has no effect, till now the advace is only affected by the RpM.



Also the presence of this manifold vacuum does perfectly correspond the engines load as you can see in the video below when driving with accelerating and deaccelerating.