Check the voltage before starting. If your battery is bad you won't be charging the capacitor bank to the desired level.
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In the case of the BCAP350, the max discharge rating is 170 Amps
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That's a lot. Depending on the voltage, the battery and the capacitor are each either a source of current, or a sink of alternator current. I've had a lot of starting problems caused by dodgy batteries or by poor connections to battery posts (unfortunately the latter won't show up until you are actually cranking).
I guess I'm losing the point of this exercise. Removing 20 or 30 pounds at substantial expense, in dollars and time, it is worth it? And that's assuming no backup battery! To me this is interesting in a motorcycle, where every pound counts and the backup is an easy bump start, but in a car?