New Accessory Pulley = Better MPG?

[NiHaoMike]

Originally Posted by yanlapanic

pretty cool but too late

my eco stop there when its time to turn up the volume ...

im 16 so you can understand that I love party music and my subwoofer also

A digital or hybrid audio amplifier is much, much more efficient than an analog audio amplifier since the transistors are ideally either fully on or off. In theory, analog is only up to about 60% efficient while digital or hybrid can potentially get 100% efficiency (with peak real world efficiencies in the 90s). The efficiency of analog drops very fast with decreasing average output power. Due to the very dynamic demands of music, real world efficiency of analog is 30% or less. In contrast, digital or hybrid retains excellent efficiency over a very wide range of output powers, meaning that real world efficiencies easily exceed 70% and often exceed 80%.

The idling loss of a hybrid is also much lower than analog or even digital. It has neither the wasteful idle bias of an analog nor the energy intensive logic of a digital.

You'll also be surprised just how little power you need to get good volume with proper design. I can turn my TI hybrid surprisingly loud and still keep the input power under one watt.

[yanlapanic]

Originally Posted by NiHaoMike

A digital or hybrid audio amplifier is much, much more efficient than an analog audio amplifier since the transistors are ideally either fully on or off. In theory, analog is only up to about 60% efficient while digital or hybrid can potentially get 100% efficiency (with peak real world efficiencies in the 90s). The efficiency of analog drops very fast with decreasing average output power. Due to the very dynamic demands of music, real world efficiency of analog is 30% or less. In contrast, digital or hybrid retains excellent efficiency over a very wide range of output powers, meaning that real world efficiencies easily exceed 70% and often exceed 80%.

The idling loss of a hybrid is also much lower than analog or even digital. It has neither the wasteful idle bias of an analog nor the energy intensive logic of a digital.

You'll also be surprised just how little power you need to get good volume with proper design. I can turn my TI hybrid surprisingly loud and still keep the input power under one watt.

where is the waste in that ?

how much would it cost for a 200 watts rms amplifier or maybe a 300 watt with 4 channels

edit :do you mean this ? http://cgi.ebay.com/NEW-PYLE-AUDIO-2...d=p3286.c0.m14

[i_am_socket]

I am so jealous of your idle consumption! Fully warmed up I can't get below .30 GPH.

[Tygen1]

I've now seen it idle down to 0.12 GPH, but normally around 0.13-0.14 now. Maybe it's time for you to buy Ford

[chuckm]

I_am_socket:
My idle consumption is typically 0.22, but it will drop to as low as 0.16 occasionally. Granted, I'm putting it in neutral at stop lights, but even in gear I'm not that high unless my A/C is on.

[Doofus McFancypants]

the Alti typical idle is 0.22 with nothing else on.
~0.23 with radio
~0.3 with headlights
~0.4 with AC

with only 70K on the car i am probably a long way from needing to replace the with underrrive. and with the few miles i put on - probably not much in the way of payback for the costs.

Will keep in mind if ever is an issue though...

[yanlapanic]

Originally Posted by i_am_socket

I am so jealous of your idle consumption! Fully warmed up I can't get below .30 GPH.

please show a bigger picture of youre front end (youre corolla )

[NiHaoMike]

Originally Posted by yanlapanic

where is the waste in that ?

how much would it cost for a 200 watts rms amplifier or maybe a 300 watt with 4 channels

edit :do you mean this ? NEW PYLE AUDIO 2 CHANNEL 2300watt DIGITAL CAR AMPLIFIER - eBay (item 200378333480 end time Sep-27-09 21:09:16 PDT)

A TI TAS5630 (2nd generation hybrid digital chipset) costs about $7 each and provides two 300w channels, so about $14 for 4 300w channels. Then you need a power supply. One that runs from 12v would have to be custom built (not as hard as it seems), but common telecom and data center 48v supplies can be used if you have a source of 150-350v DC (hybrid or EV pack). Idle power usage should be about 2.7w per chipset plus idle usage for input signal conditioning circuits and power supply circuits. Expect about 8w total idle usage. (Dynamic supply voltage can be used to reduce that, but the power supply would be significantly more complex.)

The one you linked to is a regular digital amplifier. I don't know much about that one but most mass market amplifiers are rated under ideal, unrealistic conditions. (The TI hybrid digital I built has been tested to play at about 30w RMS per channel for a few hours into a pair of test loads without any problems. Don't expect that with any consumer grade amplifier.) Also, you'll need a digital source to use a regular digital amplifier. Not a problem if you use a car PC but very few MP3 players have digital output. (A hybrid digital amplifier, in contrast, uses Delta Sigma in order to accept analog input.)

[yanlapanic]

Originally Posted by NiHaoMike

A TI TAS5630 (2nd generation hybrid digital chipset) costs about $7 each and provides two 300w channels, so about $14 for 4 300w channels. Then you need a power supply. One that runs from 12v would have to be custom built (not as hard as it seems), but common telecom and data center 48v supplies can be used if you have a source of 150-350v DC (hybrid or EV pack). Idle power usage should be about 2.7w per chipset plus idle usage for input signal conditioning circuits and power supply circuits. Expect about 8w total idle usage. (Dynamic supply voltage can be used to reduce that, but the power supply would be significantly more complex.)

The one you linked to is a regular digital amplifier. I don't know much about that one but most mass market amplifiers are rated under ideal, unrealistic conditions. (The TI hybrid digital I built has been tested to play at about 30w RMS per channel for a few hours into a pair of test loads without any problems. Don't expect that with any consumer grade amplifier.) Also, you'll need a digital source to use a regular digital amplifier. Not a problem if you use a car PC but very few MP3 players have digital output. (A hybrid digital amplifier, in contrast, uses Delta Sigma in order to accept analog input.)

ho man this is so complicated for me ....

its ok I know that it exist but im not interessted to do it myself ...

but thanks for info !!

[moorecomp]

After my 52 mile ride home from work today, I checked the screen on my MPGuino that gives gph. At idle fully warmed up and nothing else running, it showed from .30 to .27, I guess I need to check out my pullys and maybe clean the MAF sensor. I did get 43.4mpg on this tank, but out of the 449 miles this tank, 52 miles of that was EOC. I should be getting way better than that. My guino is very accurate, within 1.5 miles and .04 mpg.