Capacitor - Need a recommendation.

[Z from Japan 10+ year member]

Just to give you the background on this.... this is for a Nissan R32 Skyline GT-R, lots of mods, stock 80amp alt, Optima yellow top remote mounted in the trunk, everything is well connected and grounded. No stereo in the car.

I want to smooth out the running voltage and am thinking about mounting a capacitor with the battery. The stock 80amp alternator obviously ***** but the alt upgrades are $500+ so that will have to come later. Voltage takes a big hit when turning on the lights, A/C, etc. Smoother cleaner voltage is a plus for injectors, ign coils, and ecu.

Would a cap help me out? If so, what would be a good high quality cap for this purpose? A digital voltage display is a plus.

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[05fronty 5,000+ posts]

no get another battery for back. nice car by the way

 

[tylork92 10+ year member]

i would get a bigger battery for the trunk....also post pics of the car...im sure alot of peps would want to see it.

 

[Z from Japan 10+ year member]

You don't think the Optima Yellow top is sufficient?

Due to the intake design I can't run a battery up front, and I don't want two batteries in the trunk. Wouldn't a good cap help me stay above the battery voltage (~12.2ish) and / or smooth the fluxuations?

 

[DBBOOM 10+ year member]

Get a Jacob's Electronics Accuvolt.

Troll //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[tylork92 10+ year member]

a XS Power d3100 would do you good. i would just get the upgraded alt and be done with it. a cap isnt gonna help you.

 

[stangman67 10+ year member]

Hmm you should not be seeing any voltage drops with out any major electrical additions. Do you have any serious electrical upgrades done to the car?? Seems you may have another issue

 

[Burton6431 10+ year member]

what about one of those grounding/voltage regulator kits? many of us "honda boys" say they dont work but who knows?

 

[helotaxi 5,000+ posts]

Grounding kits are pointless.

It's quite likely that you're getting voltage drops because your alt is regulated by the ECU and requires a certain voltage drop to activate. I had 165A alt stock on my last car but because the ECU was running the show, the lights would dim when the AC compressor kicked on or you turned up the blower for the heater.

 

[Burton6431 10+ year member]

Grounding kits are pointless.
It's quite likely that you're getting voltage drops because your alt is regulated by the ECU and requires a certain voltage drop to activate. I had 165A alt stock on my last car but because the ECU was running the show, the lights would dim when the AC compressor kicked on or you turned up the blower for the heater.

many of us "honda boys" say they dont work

 

[slim2fattycake 10+ year member]

Grounding kits are pointless.
It's quite likely that you're getting voltage drops because your alt is regulated by the ECU and requires a certain voltage drop to activate. I had 165A alt stock on my last car but because the ECU was running the show, the lights would dim when the AC compressor kicked on or you turned up the blower for the heater.

x2. This is the same on my car. If I don't have headlights or ac running already, my voltage would sit at battery level even with my high output until there is enough of a load for the ECU to kick the alt on.