01-31-2008, 03:27 PM
Join Date: Sep 2007
Total Cats: 0
High output alternator (where can I get a good one, and how good are they?)
I have been doing some current measurements (DC clamp-on ammeter at the alternator and see a large draw when everything is on - spal's, blower, lights - I'll post the component draw numbers below if anyone is interested). I am first trying to track down if I should be drawing this much current but assuming I need more steady state juice does anyone have direct experience with high output alternators, how much current can I get from a good one and where might I source it)? Knowing how much current I can get will inform how I modify the current system once I confirm that everything is working properly).
Here are the numbers:
I used a clamp-on DC ammeter and measured at the alternator and turned on one component at a time and recorded the reading (rechecking the base current each time too). Listed is the excess current above the baseline when that component is turned on (I also continually checked the logged voltage which stayed at 14V during the measurements).
All measurements are done at idle and there is no fan in front of the car (no airflow into the radiator).
The car is a 91 with a turbo, MSPNP, big injectors, FM radiator and IC and other stuff...
Baseline current: 13A
Fans (FM dual Spal package) 27.6A (18A for the big fan, 9.6A for the small fan)
PIAA Headlights (Xtreme white) 18.6A
PIAA Foglights 11.4A
Aftermarket sound system on full 7.4A
Last edited by aseer; 01-31-2008 at 03:38 PM.