Jump to content
 
 

Sign in to follow this  
Mr DeeBeez

? About clamping alt

Recommended Posts

A friend of mine doesn't think his alternator is putting out what he should. He has a mechman s series 240a alt a northstar under the hood, a northstar 480 in center console, and 2 xs d7500's in the trunk and running a sq4500 on 2 hdc3 18's and 3 q90.4's. He is still dropping in the low 12's when playing music full tilt.

I went to clamp his alternator to see if it was putting out as many amps as it should, but he has 2 runs of power wire coming from his alternator. My question is, when clamping, do I clamp both wires, or just one?

When clamping one I got around 82a, and both I got a little over 160a. But to me, 160 still seems low for a 240a s series mechman. Any input would be great.

Here's a pic for reference. He went pretty overkill on electrical but still having low voltage issues somehow.

770716E3-4AFA-46B5-9FD0-08877A5BA027.jpg

  • Like (+1 Rep) 2

Fi Team 18's (4)
Crossfire 16k
Crossfire 400.4 & 800.4
Pioneer AVH-X491bhs
140ah cmax
CES 320's (2)

Share this post


Link to post
Share on other sites

Alright. Then when he played a tone, he dropped to 12.4 and alt was clamping 160ish amps. Does that seem low for a 240a s series mechman? He was also revving to 2k rpm.

It just seems like his voltage is dropping more than it should. I have pretty much same amp, less battery Reserve, and a 240a g series mechman and I've never even went below 13.7v full tilt.


Fi Team 18's (4)
Crossfire 16k
Crossfire 400.4 & 800.4
Pioneer AVH-X491bhs
140ah cmax
CES 320's (2)

Share this post


Link to post
Share on other sites

Alright. Then when he played a tone, he dropped to 12.4 and alt was clamping 160ish amps. Does that seem low for a 240a s series mechman? He was also revving to 2k rpm.

It just seems like his voltage is dropping more than it should. I have pretty much same amp, less battery Reserve, and a 240a g series mechman and I've never even went below 13.7v full tilt.

Seems low. Yes. For reving, yes. See if he revs more if it can do over 200 hot. 200 hot would seem OK i guess. But, yes, to me. Low. What is the difference between the A and G series ?

Share this post


Link to post
Share on other sites

I'm not too sure on the difference. I know the s series is used for higher rpm applications like racing. But still thinking at 2k rpm it should be putting out at least 200. On mechman website it says "offers the best balance between peak output, and output at engine idle RPM."

And especially with almost 600 ah of battery reserve, low 12's seems low for just a single q4500 and 3 q90.4's


Fi Team 18's (4)
Crossfire 16k
Crossfire 400.4 & 800.4
Pioneer AVH-X491bhs
140ah cmax
CES 320's (2)

Share this post


Link to post
Share on other sites

I'll try clamping it tomorrow with higher rpm's to see if that helps any


Fi Team 18's (4)
Crossfire 16k
Crossfire 400.4 & 800.4
Pioneer AVH-X491bhs
140ah cmax
CES 320's (2)

Share this post


Link to post
Share on other sites

Naw... i feel ya.

If you where doing 170 or whatever, but voltage was staying "higher" id just say your not making enough demand. But, dropping that low, and not seeing a larger amperage number is a bit odd, im with ya. No idea what mechman stuff is. But, seeing 11's or whatever, id think the amperage would be up there. Around rated at least. Dunno man. How old is the alt? All that good shit?

Edited by Kyblack76

Share this post


Link to post
Share on other sites

Do you know what pulley diameter he went with?


That being said a lot of people's definition of "music" is a clipped 30 hz sine wave with some 80 IQ knuckle head grunting about committing crimes and his genitals.

Share this post


Link to post
Share on other sites

Alt is only a little more than a year old, but he's not the original owner. And he's not sure on the pulley diameter, but he knows it's smaller than stock. Had to get .8" smaller belt


Fi Team 18's (4)
Crossfire 16k
Crossfire 400.4 & 800.4
Pioneer AVH-X491bhs
140ah cmax
CES 320's (2)

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...