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06-29-2011, 08:29 AM
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03 Mach
 
Join Date: Jan 2009
Location: Savannah, GA
Posts: 1,396
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voltage drop
Im looking for some opinons, Im having a voltage drop issue, when in gear, at WOT. It will be cruising 14.1-14.5 and be great, then as soon as i lay the gas down it drops, quick, down into the low 11's, its causing me to max out my pumps and I let out instantly so i dont blow the motor from a lean condition.
But Ive been playing with it, and if I fire up the car, cold, (ill let it get to around 150) and i do a WOT pull, voltage stays above 13.5 and im golden. Once ive been riding for a while and its hot is when I notice this. any ideas? Thanks.
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-03 AB Mach 5spd Accufab TB, BBK LT's, BBK O/R X, Mac Catback, JLT RAI, 98 Cobra intake cams, EBC redstuff pads, slotted drilled rotors, 31 spline mosers, 31 spline cobra posi, 3" studs, FRPP 3:73, welded tubes, smoked tails. Eaton swap! 465hp,425tq @ 15deg and 3.4pulley @ 10lb. T56 magnum! - Tuned by Eric Brooks! Built motor coming soon  -95 Chevy C1500 5.7 auto Stock, tow rig and DD. -Joey 
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06-29-2011, 03:02 PM
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Take life 1/4mi at a time
 
Join Date: May 2005
Location: Ontario Canada
Posts: 200
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Re: voltage drop
Sounds to me like a 'flying short' in your alternator. Not all that uncommon. Best bet would be to try a known good alternator first. Sometimes the centrifugal force of high rpms will cause an open or short in the alt. windings then all you are reading on your guage is battery voltage because the alternator has stopped charging. It may only happen when hot because it's just starting to fail and thermal expansion is contributing to the failure.
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 --------------------------------------------------------------------------------------- K&N FIPK, Int.Spacer, SCT Livewire, M/T 315ET's, AFS10.5's, Tri-ax, Steeda alum. uppers/lowers.QA1adj. shocks/struts. Flows w/3.5" MRT chrome rolled tips, 31Splines(the hard way), 4:30's W/Carbon Fibre Clutches, Evolution Sub X-brace W/DS Loop, SLP Line Lock+X-pipe,4 Cobalt Guages, Wideband, Meziere pump, Alum D/S, Fitch, Fiore adj.+Quad, Blue LED Conversion, Hood 4coatsofclear. |
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07-04-2011, 08:16 PM
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#3 | |
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twinturbomach
Join Date: Jul 2007
Location: lavergne tennessee
Posts: 341
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Re: voltage drop
Quote:
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TWIN HP 57MM TURBOS. BOSS BLOCK 5.5 L STROKED ENGINE. FULL BALANCED AND BLUE PRINTED, FULL RACE HEADS AND STAGE III CUSTOM GRIND CAMS TKO 600 ROAD RACE TRANNY TWIN DISC CLUTCH RETURN FUEL SYSTEM 80LBS INJECTORS FULL RACE SUSPENSION 18LBS DUAL WASTEGATE SPRINGS TWIN 62MM THROTTLE BODY KENNY BELL BAP AND BAS MAFIA BIG AIR CHIP AND MORE FUN STUFF PUMP GAS 776RWHP 16LBS BOOST C-16 RACE 981 RWHP 20LBS BOOST I RACE CROTCH ROCKETS FOR FUN 
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07-05-2011, 11:43 PM
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Registered User
Join Date: Oct 2010
Location: Arizona
Posts: 202
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Re: voltage drop
with the car warm, sitting at idle, with the voltmeter connected.. raise the rpm slowly up the rpm range all the way up to 5K.. does the voltage get fubard?
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