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The Terminator
Engine/Tuning
Voltage dropping at WOT pulls. Need Help!
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<blockquote data-quote="04Mach1Blurr" data-source="post: 14148409" data-attributes="member: 92273"><p>So I am in the middle of having my car tuned. Tuner sees that the voltage is dropping from 13.5 to 12.1 under WOT at 4500rpm. Battery is a new Motorcraft, Alternator is a PA 160 with a 3.5 inch pulley. From the battery at idle and normal driving its at 13-13.5 volts. But as soon as its under boost it starts dropping. I swapped to a brand new OEM alternator and used the 3.5 inch pulley, same thing, 13 down to 12 volts under WOT. Tried using the stock smaller pulley on the OEM alternator and it dropped even quicker at idle and at WOT to high 11s.</p><p></p><p>I'm at a loss of knowledge and need some help.</p><p></p><p>Run-down of the car:</p><p>04 Mach 1</p><p>04 Terminator Longblock</p><p>08 GT500 Posi Blower</p><p>60lb injectors</p><p>Ford GT fuel pumps (2)</p><p>Wiring upgrade to FPDM</p><p>Modified FPDM.</p><p></p><p>Thank you</p></blockquote><p></p>
[QUOTE="04Mach1Blurr, post: 14148409, member: 92273"] So I am in the middle of having my car tuned. Tuner sees that the voltage is dropping from 13.5 to 12.1 under WOT at 4500rpm. Battery is a new Motorcraft, Alternator is a PA 160 with a 3.5 inch pulley. From the battery at idle and normal driving its at 13-13.5 volts. But as soon as its under boost it starts dropping. I swapped to a brand new OEM alternator and used the 3.5 inch pulley, same thing, 13 down to 12 volts under WOT. Tried using the stock smaller pulley on the OEM alternator and it dropped even quicker at idle and at WOT to high 11s. I'm at a loss of knowledge and need some help. Run-down of the car: 04 Mach 1 04 Terminator Longblock 08 GT500 Posi Blower 60lb injectors Ford GT fuel pumps (2) Wiring upgrade to FPDM Modified FPDM. Thank you [/QUOTE]
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The Terminator
Engine/Tuning
Voltage dropping at WOT pulls. Need Help!
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