Alternators and TPI
11-04-2005, 02:25 AM
#4
Racer
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What is the output of the 77 alternator? What accessories are you running on the 77? I think stock tpi f-bodies ran 105 amp alternators. The b4c police special cars ran 140 amp alternators. The alternator has to put out as much power as the car's electrical load demands plus a little extra to charge the battery. If you are going to run electric fans for the cooling system, that adds a little to the draw. A/c will also add to the current draw. I doubt if the electronic fuel injection system of a tpi really draws all that much power, but the ecu is very sensitive to low voltage. Like any computer, it demands a good solid 12 volts at all times.
11-04-2005, 05:59 AM
#5
Racer
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In addition to the TPI I will have the dual fan set up off the GTA, AC, and an aftermarket stereo plus 100 watt amp. I average 14.4 volts but that drops when I roll down the windows, or at night when the headlights are on. The stock alternator puts out 63 amps @ 12 volts (I think).
11-04-2005, 08:03 AM
#7
Le Mans Master
I use an alternator from an 85 Vette on mine. I do have electric fans. In my truck I used the stock alternator, but stock fan. I would want at least 100 amps with electric fans.