Voltage Drop with A/C (Now voltage spike while driving)
#21
I'm with Joe on this... Those little alternators don't have a lot of nuts to begin with, add a little wear and a lot of load at a sub-optimal speed for them (most alternators don't get to full output till 1800rpm or so)... You're just asking it to do more than it can do. I hope you're running a full size battery?
#22
Boost Czar
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I wasnt trying to suggest that the low voltage was causing low rpms but that somewhat low rpm dips are causing incredibly low voltages when the a/c is running.
The voltages maintain 13.5v in most conditions without it running.
I have the run-of-the-mill "high performance" oem battery.
the voltage spike today is what really had me headscratching. I couldn't get my car running without holding the throttle, and it wouldn't drive. The voltages never came back down so I shut the car back off...took a couple of key cycles before it finally reported 12v again and all was normal.
The voltages maintain 13.5v in most conditions without it running.
I have the run-of-the-mill "high performance" oem battery.
the voltage spike today is what really had me headscratching. I couldn't get my car running without holding the throttle, and it wouldn't drive. The voltages never came back down so I shut the car back off...took a couple of key cycles before it finally reported 12v again and all was normal.
#28
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i head those arent even that great. are they PNP?
the stock is 60 amps. I was looking at some 65 amp ones... do i really need 140Amps?
I was thinking about going with a remanu. instead of used.
what are they rated at 12 or 14v?
12 * 60 = 720watts
12 * 65 = 780watts
12 * 140 = 1680watts
I do have a 500watt amp in the trunk...but I doubt I need that much reserve.
assuming 14v running
14 * 60 = 840watts
14 * 65 = 910watts
14 * 140 = 1960watts
this however could work out: http://cgi.ebay.com/ebaymotors/MAZDA...item45df0e5fc3
the stock is 60 amps. I was looking at some 65 amp ones... do i really need 140Amps?
I was thinking about going with a remanu. instead of used.
what are they rated at 12 or 14v?
12 * 60 = 720watts
12 * 65 = 780watts
12 * 140 = 1680watts
I do have a 500watt amp in the trunk...but I doubt I need that much reserve.
assuming 14v running
14 * 60 = 840watts
14 * 65 = 910watts
14 * 140 = 1960watts
this however could work out: http://cgi.ebay.com/ebaymotors/MAZDA...item45df0e5fc3
Last edited by Braineack; 04-26-2011 at 01:06 PM.
#31
Getting the pulley off is a PITA. I've pulled them two ways. The dumb way is to hold the pulley in a vice - 100% chance of damage to the pulley. The recommended way is to pull the case apart and hold the rotor in the vice.
#32
Boost Czar
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they are identical but for the pulley. Problem would be removing the ribbed one and finding out my v-notch's keyway doesn't fit.
I'll probably pick up a remanufactered 1.6L automatic alt, they run at 65A vs the 60A of the manual.
ill just leave the a/c off in the time being.
I'll probably pick up a remanufactered 1.6L automatic alt, they run at 65A vs the 60A of the manual.
ill just leave the a/c off in the time being.
#38
means I have to air up the tires, push it into the garage, pick it up in the air, get underneath it, remove the undertray, remove the alternator, put the undertray back on, put a warning on the battery cables, drop the car, push it back out of the garage, box up the alternator, shower as much crap off of me as possible, take it to the post office and put it in a flatrate box, and hope I don't get hurt doing it.
I'll do it for $45 shipped - not because I think the part is worth that, but my time is quite valuable, might be 2 or 3 days before I can get it out of the car.
Comes with a close-box guarantee. I guarantee it until I close the shipping box.
Up to you. The car was running before it was a parts car, but due to the PO being a CR.NET wannabe, he had destroyed it so bad that I deemed it irrepairable. It's the 203rd miata ever made per VIN
I'll do it for $45 shipped - not because I think the part is worth that, but my time is quite valuable, might be 2 or 3 days before I can get it out of the car.
Comes with a close-box guarantee. I guarantee it until I close the shipping box.
Up to you. The car was running before it was a parts car, but due to the PO being a CR.NET wannabe, he had destroyed it so bad that I deemed it irrepairable. It's the 203rd miata ever made per VIN