1983 Toyota Celica GT-S - Message Forum (Re: addendum)

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Re: addendum

Posted By: Steven Benner

Posted On: July 08, 2002 at 12:18 pm EDT

Exactly right, 660 to 720 watts at 12V running 55 to 60 amps off of the alternator. But the electrical system isn't just run off the alternator. There is the batter wich is capable of massive amperage. Then there are capacitors and transformers to handle the individual extra requirements. The battery itself serves as a big powerful capicitor for the alternator.

To give you an idea of what I am tring to say. My new MSD ignition system will put out 460-480V primary from the box. That requires only 5 Amps at 5,000 RPM, less at lower RPMs. Then that 470V is sent through the Blaster coil, after that, when it finaly meets the spark plugs there is 45,000V to the plugs. This is only for a tiny length of time but at any amperage this is way in excess of what the alternator is 'rated' for. But is not bad for the elictrical system.

All sterio amplifiers (and all other components) are rated to peak power, on the loudest note, for the smallest time. RMS is usualy about half the number on the amp. My 600w amp has an RMS of 300 or so. There are still people out there running 1,000w or more RMS to their sound system. Often with multipul amps.

Steve

Bryan Stuurman wrote:

> Toyota service manual says the
>  celica alternator is rated at
>  55 to 60 amperes. read this a
> s 660 to 720 watts. keep in mi
> nd this is PROBABLY a reccomen
> ded peak value, meaning that y
> ou may be able to get away wit
> h 800W, provided nothing else
> electrical is running, like sa
> y, gauges, ECU (go twin sidedr
> aft!) or dash lighting.. obvio
> usly this is un-feasible. my q
> uestion is: is it really 800W
> RMS? check the rating on the f
> use that plugs into the side o
> f the amplifier and get back t
> o us.. my buddy bought a 300W
> amp only to find out that it p
> roduces 100W rms, or loads the
>  alternator to about 10 ampere
> s.
> if people want, i can make you
>  ALL savy on stereo power rati
> ngs, and the big load the mark
> eting guys will feed you.
>    -Bryan

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Message:	Steven Benner wrote: > Exactly right, 660 to 720 watt > s at 12V running 55 to 60 amps > off of the alternator. But th > e electrical system isn't just > run off the alternator. There > is the batter wich is capable > of massive amperage. Then the > re are capacitors and transfor > mers to handle the individual > extra requirements. The batter > y itself serves as a big power > ful capicitor for the alternat > or. > > To give you an idea of what I > am tring to say. My new MSD ig > nition system will put out 460 > -480V primary from the box. Th > at requires only 5 Amps at 5,0 > 00 RPM, less at lower RPMs. Th > en that 470V is sent through t > he Blaster coil, after that, w > hen it finaly meets the spark > plugs there is 45,000V to the > plugs. This is only for a tiny > length of time but at any amp > erage this is way in excess of > what the alternator is 'rated > ' for. But is not bad for the > elictrical system. > > All sterio amplifiers (and all > other components) are rated t > o peak power, on the loudest n > ote, for the smallest time. RM > S is usualy about half the num > ber on the amp. My 600w amp ha > s an RMS of 300 or so. There a > re still people out there runn > ing 1,000w or more RMS to thei > r sound system. Often with mul > tipul amps. > > Steve > > > Bryan Stuurman wrote: > > > Toyota service manual says t > he > > celica alternator is rated > at > > 55 to 60 amperes. read this > a > > s 660 to 720 watts. keep in > mi > > nd this is PROBABLY a reccom > en > > ded peak value, meaning that > y > > ou may be able to get away w > it > > h 800W, provided nothing els > e > > electrical is running, like > sa > > y, gauges, ECU (go twin side > dr > > aft!) or dash lighting.. obv > io > > usly this is un-feasible. my > q > > uestion is: is it really 800 > W > > RMS? check the rating on the > f > > use that plugs into the side > o > > f the amplifier and get back > t > > o us.. my buddy bought a 300 > W > > amp only to find out that it > p > > roduces 100W rms, or loads t > he > > alternator to about 10 ampe > re > > s. > > if people want, i can make y > ou > > ALL savy on stereo power ra > ti > > ngs, and the big load the ma > rk > > eting guys will feed you. > > -Bryan
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