So what is everyone getting with starter draw voltage? Car I am messing with has a battery relocation to the rear bin and seems decent. I ended up doing the rx8 starter swap for the 2K starter to get the starting faster. So these 3 are starts with different wiring.

First is stock(well without the jumper cables added and with the battery relocated to rear), second is with a set of jumper cables with only ground attached between battery and starter, and third is with the ground and positive jumper attached to starter from battery.

12.7
6.7
7
7.3
7.5
7.8
8.4


12.8
5.8
9.1
9.2
9.3
9.4
9.5

12.9
6.5
6.6
9.9
9.9
9.9
10

 

Think I'm in the first scenario in your description - relocated battery but no jumper cables to the starter.

7.7 - 7.9 is what I see during cranking most of the time. If I see anything less than 7.7 (mostly when the car hasn't been driven for more than a week) I know i"ll have to jump start the car.