What voltage does the 98 z24 idle at? THe reason im asking is because amplifiers usually rate their amps at 14.4v so I want to know what rpm our cars have to be to acheive 14.4v
With stock alt 1/0 big 3 and 2 battery i idle at 14.7
ic.. how about the stock setup though, at least it gives me a reference point
It's going to vary with temperature and a thousand other variables, should be around 13.5 or so.
It's going to vary with temperature and a thousand other variables, should be around 13.5 or so.
My 1997 2.2 tends to sit between 14.0 and 14.3, if I'm to believe my aftermarket volt gauge. This does not vary with higher RPMs, although I can quickly reduce it with a bit of stereo volume -- especially while idling.
Edited 1 time(s). Last edited Friday, January 25, 2008 11:30 AM
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Depends on alot of things, weather included. And it wont charge higher voltage by "revving" the motor.
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Achieving 14.4V is easy (at least with no load on the alt).
It's keeping it there that's the hard part.
GAM (The Kilted One) wrote: if you think you're that much better than them because you're "correct" I hope your progeny don't turn out as screwed up as yourself.
how does temperature affect voltage?, that one surprised me?? Is it that warmer temperatures promote higher voltage. And I always assumed revving helps increase voltage, cant back it up with any hard facts just a word of mouth thing. So that means, the power produced at 14.4v rated on most amps are generally true.
dan z24 wrote:So that means, the power produced at 14.4v rated on most amps are generally true.
Not really. Every amp (even the same model) is different. That rating is just a safe average from tests at the factory. If you wanted to know what your amp can actually do you'd need some decent test equipment and time.
generated voltage in any generator is related to speed of the rotor and magnetic field strength (coming from the voltage regulator). everything else is determined by the design of the generator itself (number of windings ,number of poles, air gap spacing). revving the motor does help over idling. at idle the regulator is working hardest because the speed is lower therefore the field must be greatest, but once the alternator speed and regulator output is enough for your alternator to put out its rated output, revving the engine higher doesn't do any more good.
temperature effects....minimal. not even worth discussing.
all generators have an natural voltage "droop" also. this causes voltage to lower with rising output current. the only way to combat this is with a different alternator with more capacity or use something to store reserve power such as another battery or capacitor.
When my car is cold it idles at 14.9-15 volts. when it warms up it drops to 14.7. I of course have an aftermarket alternator with external voltage regulator.
Lanman31337 - Cavfire wrote:When my car is cold it idles at 14.9-15 volts. when it warms up it drops to 14.7. I of course have an aftermarket alternator with external voltage regulator.
is the idle speed the same. most cars idle slightly faster when cold. Electrically there is no reason for the temperature to affect voltage noticeably.
O ok i mentioned temperature because it was mentioned that idle voltage depended on many factors and temperature and weather was mentioned. But it seems like those facts are almost negligible with the only ones being making a difference in the alternator the big 3. And i guess its safe to say that our cars idle at just above 14v then. I was interested mostly in the 14.4v value because a lot of amps are rated at that voltage.
I want to throw this in rather than making a new thread. But my HU is the 880PRS but the HU voltmeter says i have 15.7v at idle, but using another voltmeter on the batt it reads normal (14.4v). Anyone know why my HU would read 15.7v??
maybe it's measuring the voltage of the remote output?
actually reving helps to a certain extent, for an alt to put out it's maximum current (not voltage) it needs to be spinning at 2000 rpm, this wont increase the voltage however, but when runnign car audio it helps to have that extra current.. at idle your average car should sit around 14.4 depending on lots of things, mine usually sits around 14.3 to 14.5.
