The battery can store thousands time more than capacitor, so to speak. So, it is pretty much useless if you are expecting capacitor power for even 1 minute

the 1400F 2.5V capacitor can provide only about 73W of power over 1 minute duration. So for 6 capacitor. you get about 438W for 1 min burst. If your alternator cannot supply enough power, capacitor cannot help since the alternator does not enough power to start with.

Capacitor can help for sudden power surge like in milliseconds that is beyond the capability of car battery but personally I think would be unlikely to happen in car environment. The car battery can provide far more power for 30s than those capacitor above I believe based on CCA rating

what are thoseeeee???

u want photo of my engine bay? ill take it tomorrow. P/S, my cables i run them behind the engine. the only cable u can see is at alternator 

ya engine works fine with battery taken out while engine on