How (and why) to Ramble On your domestic shorthair - Page 702 - Miata Turbo Forum -Boost cars, acquire cats.

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Old 09-04-2012, 02:29 AM   #14021
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Been a while since I took physics and I'm ******* horrible at this **** so I pose a simple circuit question.

I plan to run a mini amp off the cigarette lighter circuit. Amp calls for 12v DC @ 6amps. What would I need to get to reduce the amperage off the cigarette lighter circuit so the amp doesn't distort since apparently it's picky about power. Resistor? Resistor with zenner diode? The goal is to just junk the head unit and run just an mp3 player.

School my ***.
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Old 09-04-2012, 04:23 AM   #14022
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Nothing, the amp will still draw a max of 6A. The cigarette lighter socket can't force the amp to draw more than 6A.
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Old 09-04-2012, 12:30 PM   #14023
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Yup.

When speaking of a power supply, consider the analogy of a water pipe in your home.

The pressure inside this pipe is regulated (by a device at the inlet to the home) to some constant pressure, say 40 PSI. Most of the devices in your home which use or consume water (the toilet, the sink, the water heater, the shower, etc) are designed to operate at this pressure. If you supply them with less pressure then the toilet will take longer to fill and your shower will produce a crappy spray pattern. If you subject them to significantly *more* pressure than this, they might fail catastrophically (toilet overflows, water softener bursts, etc.)

That's the "voltage" of the system- the amount of electrical pressure on the line. Volts = PSI.


Now, because the line coming into the home is only 1" in diameter, there's a limit to how much water the home can supply at once. If you've got the sink and the shower both on, you're drawing maybe 10 gallons per minute. If you then also flush the toilet, start a load of laundry and attempt to drown gophers in the lawn with the garden hose, these devices combined are now trying to draw 40 GPM, except that's more than the house can supply, so the pressure starts to drop and none of the devices work right.

That's the "rated supply current" of the system- the amount of electrical flow which it can deliver to all loads combined without falling below rated voltage or failing in some other way. Amps = gallons per minute.


There is no such thing as too much supply current. You could connect your little car stereo thing directly to the car's battery, which is capable of supplying upwards of 500 amps for short periods of time, and it would work just fine.

You must not connect any electrical device to a supply with a voltage which is higher than the device's rated voltage, however your MUST ALWAYS connect an electrical device to a supply whose source current rating is higher than the device's current requirement.

Assuming that you meet the voltage spec, the amount of current which any electrical device will consume is inherently self-limiting. For instance, a 100w headlamp, when connected to a 12v supply, will always draw 8.3 amps (google Ohms Law to see why this is). And your car stereo, likewise, will only draw as much current as it requires when connected to a 12v supply.


Note that for the purposes of this post, I am using "12 volts" to cover any supply voltage in the range of 11 - 14.5v which you'd normally encounter in a car. The math does move around a bit as the supply voltage goes up and down, but not enough to radically change the underlying principles being conveyed here.
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Old 09-04-2012, 09:57 PM   #14024
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Thanks, gays. Much appreciated.
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Old 09-05-2012, 06:37 AM   #14025
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Picking up a new(er) diesel today, very excite
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Old 09-05-2012, 05:40 PM   #14026
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Stupid question time again.

There was talk of ebay turbos fitting in genuine garrett parts and vice versa. Any reason why this wouldn't fit into my .48 garrett turbine housing? I don't see why not but I figured it couldn't hurt to run it by the more trained eyes of MT.

GSP T3 INTERNAL WASTEGATE UNIVERSAL TURBO CHARGER .48AR 8PSI 2.5" V-BAND STAGE 3 | eBay

Bonus points for posting up a link to Brain's china charger on ebay if this isn't the same.
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Old 09-06-2012, 09:50 AM   #14027
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You guys know how to clean the breather on top of the diff? A new one is like 10 bucks and a couple days out.
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Old 09-06-2012, 09:57 AM   #14028
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Quote:
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You guys know how to clean the breather on top of the diff? A new one is like 10 bucks and a couple days out.

remove it and clean it?
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Old 09-06-2012, 10:18 AM   #14029
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remove it and clean it?
What's the Correct way to do it, I know they get blocked on the inside.
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Old 09-06-2012, 10:22 AM   #14030
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its just a ball/spring.

soak it in seafoam or something.
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Old 09-06-2012, 10:24 AM   #14031
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Quote:
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its just a ball/spring.

soak it in seafoam or something.
K. Easy enough.
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Old 09-06-2012, 10:24 AM   #14032
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Quote:
Originally Posted by redturbomiata View Post
What's the Correct way to do it, I know they get blocked on the inside.
Changing the rear differential vent

Rear Differential vent plug - MX-5 Miata Forum

Differential vent - MX-5 Miata Forum
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Old 09-06-2012, 02:19 PM   #14033
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why do my packages of parts and cool stuff deliver a day before or on I leave for something for the air force? This is the 6th time this has happened since the beginning of this year, i hate waiting just to get a package, let alone waiting extra days to see it because I just left.

Damn you UPS.

At least I get my two GTX 660ti's today, but my forged rods, pistons and other biddies come in tomorrow when I leave!




/rant
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Old 09-06-2012, 02:22 PM   #14034
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you're bad at logistics/planning?
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Old 09-06-2012, 02:24 PM   #14035
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Quote:
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you're bad at logistics/planning?
Actually im a pro at it (aerial transporter)


they are bad at it.
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Old 09-06-2012, 03:38 PM   #14036
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the have fancy little maps that show you exactly how long it will take a package from X to Y; always accurate for me.
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Old 09-06-2012, 03:47 PM   #14037
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Quote:
Originally Posted by Braineack View Post
the have fancy little maps that show you exactly how long it will take a package from X to Y; always accurate for me.
I like blaming UPS for their lame chockout hour for the day, but the real blame goes to whoever packages the item and lazily drops it off at UPS.
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Old 09-06-2012, 07:26 PM   #14038
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Just bought this!



Back Magic Multi-Level Adjustable Back Stretching Device: Amazon.com: Sports & Outdoors Back Magic Multi-Level Adjustable Back Stretching Device: Amazon.com: Sports & Outdoors


I'm tired of slamming my back against the floor after a long day. Time to try something a little easier.
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Old 09-07-2012, 10:48 AM   #14039
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Quote:
Originally Posted by Vashthestampede View Post
Just bought this!



Back Magic Multi-Level Adjustable Back Stretching Device: Amazon.com: Sports & Outdoors


I'm tired of slamming my back against the floor after a long day. Time to try something a little easier.
So wait what exactly does that contraption do or help do?
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Old 09-07-2012, 10:50 AM   #14040
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i have one of those:



sometimes referred to as a "chair arm" and come in 3 different styles.
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