disprovable Posted April 17, 2017 Report Share Posted April 17, 2017 My setup: 2006 Infiniti G35 Coupe 6 MT 2 10in. DC Audio Level 3s Crescendo Audio bc2000.1 Pioneer AVH-4000NEX Mechman 270 Amp HO Alternator Big 3 done in Soundqubed 1/0 gauge OFC Power wire 1/0 gauge OFC Sky High Car Audio Ground wire 1/0 gauge OFC Soundqubed ran from the amp to the battery Starting battery/Only battery XS Power D3400 Stinger Volt meter wired straight to my head unit Problem: So I just recently installed the HO alternator due to my stock 120 amp not being enough. The install went smooth. Started up my car just fine, resting voltage is 14.2-14.4v. When driving I have no issues my voltage sits at 14v and very rarely drops to 13.9v. My car idles at about 600 RPM or so. According to mechanical my alt should make about 130 amps at 600 RPM. Its rated for 800 rpm, and does 173 at 800. When idling my voltage drops down to lower 12vs and bounces all over the place. Sometimes it even gets down to high 11vs. What can I do to fix this? I want to be able to play full tilt while idling at a stop light or coming to a stop. Link to comment Share on other sites More sharing options...
hdorre Posted April 17, 2017 Report Share Posted April 17, 2017 I understand that you idle at 600 rpms. However, when your volume is up, does your idle drop a tad lower? Also, are you wired to .5 or 1? If wired to .5, that makes complete sense. You are drawing more power than your alternator supplies, which drops you into resting. From there, additional power is being pulled from your battery. On 5/8/2011 at 7:38 PM, Kranny said: On 5/8/2011 at 7:35 PM, 'Maxim' said: It hurts me inside when I read stuff like this and remember you're 15 LMFAO so true Mitsubishi 3000GT (Old Build) Headunit: Pioneer 80PRS Frontstage: (2) McLaren Audio MLT-2 Tweeters & (4) PRV Audio MR Series Neo 6.5" Mids Substage: 4 15" Hybrid Subs - Tantric Motors & Sundown Softies Amps: Banda 2.4D Amp (Tweets), American Bass VFL 350.4 (Mids), and (2) Ampere 3800s Electrical :Singer 260A Alt & JY Power Lithium 2005 Chevy Colorado Ext Cab Headunit: Pioneer 80PRS Frontstage: 4 PRV 700Ti Tweets & 6 10" Delta Mids on 3000wrms Substage: 6 Fi BTL 18s in a 4th Order Walkthrough on 3 Wolfram 4500s Electrical: Singer "390" and JY Power My Official Feedback Thread Link to comment Share on other sites More sharing options...
Masterbasser Posted April 17, 2017 Report Share Posted April 17, 2017 sounds like ur alts not charging at idle, same way my 320 was I ended up raising my idle with a zip tie on the throttle cable to throttle body area Kenwood excelon ddx795 3 370 amp CES alternators (audio side only) McLaren dome tweeters Crescendo 6.5 ultra neos NVX JAD800.4 4 PA x4 SPL 18's 4 Digital Designs m5's at .7 ohms each 2 K2 80 ah lithiums 3 group 31 agms Ledglow million color (12 piece) 2007 Yukon xl Link to comment Share on other sites More sharing options...
Ron36 Posted April 17, 2017 Report Share Posted April 17, 2017 Sounds about right got 4K RMS and at stop lights drop to 12.7-12.9 u may need more batteries to help alittle, I got 6 batteries . I also see your alt not charging really high when I put my HO alt on I went from 14.4 to 14.9-15v , u should be charging more then stock voltage that's the point of a HO alt. 2022 Ford Maverick on 22’s Skar SK1500.1 on 4 Skar VD-8’s Mids Sundown Super tweeters, Skar TX 6.5 components on Skar SKM400.4 LC2 for audio control , XS Power D680 XS Series Extra Battery Link to comment Share on other sites More sharing options...
ShadeTreeMechanic Posted April 17, 2017 Report Share Posted April 17, 2017 You need batteries in the back. When the voltage bounces around it is because the voltage regulator can't react fast enough for the demand. A battery or two in the back will help a lot. 91 C350 Centurion conversion ( Four Door One Ton Bronco) 250A Alternator (Second Alternator Coming Soon) G65 AGM Up Front / Two G31 AGM in Back Pioneer 80PRS CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon) Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon) Link to comment Share on other sites More sharing options...
disprovable Posted April 18, 2017 Author Report Share Posted April 18, 2017 1 hour ago, ShadeTreeMechanic said: You need batteries in the back. When the voltage bounces around it is because the voltage regulator can't react fast enough for the demand. A battery or two in the back will help a lot. How should I wire the second battery? Should I use an isolator? Also, when I'm full tilt my idle does bounce a lot. Goes back and forth up and down. Link to comment Share on other sites More sharing options...
disprovable Posted April 18, 2017 Author Report Share Posted April 18, 2017 2 hours ago, hdorre said: I understand that you idle at 600 rpms. However, when your volume is up, does your idle drop a tad lower? Also, are you wired to .5 or 1? If wired to .5, that makes complete sense. You are drawing more power than your alternator supplies, which drops you into resting. From there, additional power is being pulled from your battery. I'm wired to 1 ohm. Link to comment Share on other sites More sharing options...
disprovable Posted April 18, 2017 Author Report Share Posted April 18, 2017 2 hours ago, Masterbasser said: sounds like ur alts not charging at idle, same way my 320 was I ended up raising my idle with a zip tie on the throttle cable to throttle body area I've looked into ways to raise my idle, but there doesn't seem to be a way on my car without reflashing it. There's no idle adjustment screw. Also, sorry for all the posts. I'm on my phone.. Link to comment Share on other sites More sharing options...
Ron36 Posted April 18, 2017 Report Share Posted April 18, 2017 Positive from front battery to positive on rear, grounds go to body grounds . 2022 Ford Maverick on 22’s Skar SK1500.1 on 4 Skar VD-8’s Mids Sundown Super tweeters, Skar TX 6.5 components on Skar SKM400.4 LC2 for audio control , XS Power D680 XS Series Extra Battery Link to comment Share on other sites More sharing options...
Ron36 Posted April 18, 2017 Report Share Posted April 18, 2017 Your car is a fly by wire throttle no cable , not going to be easy to adjust it. Still with that HO alt in park idleing system off u should see more then 14.4 , should be close to 15 I think that's odd. 2022 Ford Maverick on 22’s Skar SK1500.1 on 4 Skar VD-8’s Mids Sundown Super tweeters, Skar TX 6.5 components on Skar SKM400.4 LC2 for audio control , XS Power D680 XS Series Extra Battery Link to comment Share on other sites More sharing options...
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