Mobileaudio25 Posted March 27, 2013 Report Share Posted March 27, 2013 I have a 180 amp alternator and I drop down to 12.8 on heavy bass notes at idle. Would putting a smaller alternator pulley make much of a difference or no? Link to comment Share on other sites More sharing options...
Raptorman Posted March 27, 2013 Report Share Posted March 27, 2013 It should, yes. 1996 GMC Sonoma Four Fi BTL Neo 18's In 2:1 6th Order Bandpass 2 Ampere 5k's @ .5 TEAM FI TEAM #LITHIUMCANTDEMO On 10/20/2013 at 0:37 AM, KillaCam said: Fucking with a Prius driver is like making fun of a disabled kid. Pussies. Link to comment Share on other sites More sharing options...
MarioB Posted March 27, 2013 Report Share Posted March 27, 2013 The smaller pulley does help at idle. 12- DC Audio m2Lvl3 12's1- Hertz HSK3 way2- DC5K's2- ZX350.42- Stinger SP1500D batteries in rear3- runs of 1/0ga. to the rearTeam DC Audiodcsoundlab.com Quality is all in how you take pictures I have plenty of projects that look WAY better on camera then in person crazy to fit so many in so little. Reminds me of some of the porns I've seen? Link to comment Share on other sites More sharing options...
Mobileaudio25 Posted March 27, 2013 Author Report Share Posted March 27, 2013 I'm sure this is a very difficult question to answer without testing, but do you have any idea how much it will help at idle? Should i just try and get the smallest one on there without any belt slippage or tension problems ? Link to comment Share on other sites More sharing options...
SnowDrifter Posted March 27, 2013 Report Share Posted March 27, 2013 It will help at idle. But there is a tradeoff: depending on your pulley ratios and shift points on your car, you might overspin the alt at high-rpms, and you will increase your chance of belt slip. ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
Mobileaudio25 Posted March 27, 2013 Author Report Share Posted March 27, 2013 This car is by no means a high rpm car. It's lifted with 22s and I just cruise in it. I don't even run over 65 on the highway ever, so hopefully I don't run into that issue. But I guess there isn't anyway to tell without testing... Link to comment Share on other sites More sharing options...
SnowDrifter Posted March 27, 2013 Report Share Posted March 27, 2013 20,000rpm is usually the max allowable RPM for an alternator. You can measure your crank pulley and the smaller pulley for your alt. Divide the crank pulley diameter by the alt pulley diameter to get your ratio. Then multiply that by your engine RPMs to get your alt RPMs. Example: I have a 150mm crank pulley and a 50mm alt pulley. This is a 3:1 ratio. My car relines at 6500rpm, so 3*6500=19,500rpm. So that's safe, but I couldn't put a larger alt pulley on or I would exceed the maximum rpm ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
Crandis16 Posted March 27, 2013 Report Share Posted March 27, 2013 in a perfect world... yes. and in your case I wouldn't think that you will have any issues... I have a 98 escort zx2, primarily driven by teen girls and old women, and I upgraded the alt from 95a to 230a WITH an overdrive pulley on it. All I had to do was get a tighter belt belt to compensate for smaller diameter and everything was up and running. My Red zx2 Build Log My Black zx2 Build Log My Red zx2 UBL Link to comment Share on other sites More sharing options...
Mobileaudio25 Posted March 27, 2013 Author Report Share Posted March 27, 2013 Could thanks for the schooling I'm to the mathatics. Definitely doing to start using that Link to comment Share on other sites More sharing options...
OrzechNJ Posted March 27, 2013 Report Share Posted March 27, 2013 I got my singer alt with smaller pulley and it works great.. I dont know how much but im SURE it helps !!! sometimes Loud is NOT pretty Sounds like its safe to go ahead and bend that ass over. Link to comment Share on other sites More sharing options...
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