Direct Power System (DPS)

[goldwing2000]

Well while your alternator is charging the battery, it is putting a greater parasitic load on the engine. The sensible thing to do would be to program the ECU to disable battery charging while the engine is under WOT or heavy acceleration. This would give a perceived power boost. Set it where the battery is not charged during normal operation until it gets down to around 11.5 volts. Then start charging the battery more aggresively.

I personally don't understand why we haven't seen a push to power the engine accesories (power steering, water pump, A/C, EGR stuff....) by small DC motor? A small 5 HP DC motor made out of rare-earth magnets would provide plent of torque for running all of your accessories at a constant speed, leaving all engine HP available for the drivetrain....

Our 3 does have a small DC motor to run the Power Steering.

A step in the right direction?

 

[Pheonix]

Well while your alternator is charging the battery, it is putting a greater parasitic load on the engine. The sensible thing to do would be to program the ECU to disable battery charging while the engine is under WOT or heavy acceleration. This would give a perceived power boost. Set it where the battery is not charged during normal operation until it gets down to around 11.5 volts. Then start charging the battery more aggresively.

I personally don't understand why we haven't seen a push to power the engine accesories (power steering, water pump, A/C, EGR stuff....) by small DC motor? A small 5 HP DC motor made out of rare-earth magnets would provide plent of torque for running all of your accessories at a constant speed, leaving all engine HP available for the drivetrain....

that'd be nice, i'd probally be able to identify stuff under the hood better then.
i heard the AC draws 10HP, could and electric motor run the compressor without killing the battery?

goldwing2000, crazy, can you move your wheel easily when the engine is off? i'll try it with my brother's 6. unless it's locked when the ignition is off.

 

[goldwing2000]

Nope. The system is disabled when the engine's not running. Dammit. (evil)

 

[rodslinger]

Nope. The power steering system is disabled when the engine's not running. Dammit. (evil)

I found that out the hard way... If you've ever had a check engine light come on you can sometimes kill it by cycling the key while driving (just don't turn the key so far back as to lock the steering)... Last winter I got the thermostat code while driving and did a quick ignition switch flip to shut it back off. Well when you do that, the PS shuts off to even though the engine is still running. It will come back on after a few minutes of driving you can pull over and just restart the car normally... Makes whipping into a gas station a little difficult.

 

[goldwing2000]

Yikes. Sounds like at least a pucker factor of 5 on that one. (wow)

 

[Mazda3ofKent]

Actually it's not physics. It's mathematics...

Horsepower is a calculated number based on torque. The forumla is (Torque X RPM's)/5252... The horsepower and torque values should ALWAYS cross at 5252 rpm's because that is how it is calculated.... If their dyno chart doesn't show that then something is fudged. I'll take a long shot and guess that they fudged their dyno numbers..... If you change the forumla values, you change the result.... If they decided to divide by 4200rpms instead, voila, more horepower...

-edit-
I just looked at the dyno charts. The first one appears to cross right at 5000 rpms, the second about 4750. This would account for claims in increased HP. I doubt there are any real gains, just a marketing gimmick. Whoever bought it got hosed. Bow your head in shame or go by a Tornado fuel saver....

damnit math has real applications out side of class