Yaaay! We have a winner! You are right! Unless you are tuning your ecu for mods, ie.injector size change.,leave if to the pros who designed the system to work under any circumstance. See now...now that I think of it...the only place a (capacitor might actually help would be in the ignition system for stronger spark) but I believe all this then would fall under the (coil) category? I always figured capacitors were used for 1 thing, to filter the energy from spikes and drops, and I'll come back to my original response, no need at all! Unless u have a kickass system that strains the charging system.(lights dim, alt gauge bounces around to the mind numbing bass you must be producing) hehe. Been there! Done that.....wifey didn't like it...so.....that. was that...haha. honestly peps,,,,,instead of the capacitor thought train,,,,look into better grounding techniques! You will actually feel and see gains from that improvement. All electrical needs a good ground to work right ,, right?

 

That's probably all true, but the people that designed it did so with the electrical system as it is and not with a steadier voltage. It does not follow that changing the electrical system post-design will be guaranteed to give an improvement, since the designers will not have anticipated this change. Systems are designed as systems and even an "upgrade" to part of a system can have unintended consequences.

They actually designed this system to work on anything from 9 volts to 15 in quarter volt increments yes every car computer is set up to handle any and I mean any changing the voltage so the car runs the same the only time people mess with injector latency is when they change injectors either going bigger or a different brand wen doing mods. Help you understand a little more look up Chrome ECU tuning for Hondas you can download the free version and you can see all the different things you can change and the voltage variances only effect the timing when the injectors open and close now granted that's for mid to late nineties Hondas and the cars today or lot different but they all still work off the same principle keeping the electrical system at one solid point is good because you're not weakening the load on anything but again they were designed to handle it

 

Thank you all for the replies. Learnt a lot from this.