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View Full Version : Anyone use Labella's PWM?



Brent
08-06-2011, 07:59 PM
I'm back in the market for a 30-50amp PWM and was wondering if anyone is using the Labella's Garage unit? This one actually comes with mounting brackets.

Brent
08-06-2011, 10:15 PM
I like the low profile of yours along with the mounting flanges. The PCU-3 (and PCU-2) doesn't have any external mounting hardware. And the four small 8-32 holes I drilled into the corners of the enclosure were by the company's terms "damage" that caused the unit to fail.:rolleyes: (I have the emails to document that)

I can only conclude that they intend for their units to either bounce around loose under the hood or to be secured with bungie cords. Call me crazy but I tend to avoid using either of those methods for securing expensive high amperage components.

Weapon_R
08-06-2011, 11:46 PM
That's nothing more than a motor controller. You want a constant current PWM.

Here is my latest design:

http://www.hhoforums.com/attachment.php?attachmentid=1899&stc=1&d=1312681164

Not officially on the market yet.... price will be $125 or less shipped.

Shane that unit looks interesting. Please provide me with more info on this unit. What is the current rating.

myoldyourgold
08-07-2011, 12:11 AM
Shane, exclent looking and I am sure it works as good as it looks. How is the reactor doing? Give us an update.

lhazleton
08-07-2011, 11:57 AM
Looking good, Shane! Glad to see you're getting something accomplished.;)

Brent
08-07-2011, 08:08 PM
Would you suggest a cooling fan as some added insurance or does the case sink the heat away adequately by its self?

Brent
08-08-2011, 01:02 AM
Keep us posted, that unit sounds like it's going to work great. My entire system has been bench tested, flow measured and is installed ready to go. The only thing left is a PWM that actually works for me. Wouldn't that be fun!

Weapon_R
08-08-2011, 11:45 PM
Shane would love to see this unit controlled by voltage as an option. That would allow the input to be controlled via a map sensor for example or throttle position sensor.

myoldyourgold
08-08-2011, 11:56 PM
Shane would love to see this unit controlled by voltage as an option. That would allow the input to be controlled via a map sensor for example or throttle position sensor.

I second that. I would then be convinced to use a PWM.

BioFarmer93
08-09-2011, 09:40 AM
Shane would love to see this unit controlled by voltage as an option. That would allow the input to be controlled via a map sensor for example or throttle position sensor.

X3 on that-
Shane, I will be pulling about 100A+, what will it take to upgrade the terminals, and is it adjustable with a pot so I could just clamp an arm onto the shaft for mechanical input from my throttle cable?
At the amperage I'm pulling I'm reasonably sure it would be a good idea to have some supplemental cooling and I have plenty of room under the hood, could you assemble one on a chunk of finned aluminum heat sink so I could direct some airflow over it?

myoldyourgold
08-10-2011, 12:05 AM
I already have my reactors switch off at idle. The only time the lag is even an issue is if you are idling for a long time. The reactor keeps working for a little after current is shut off so if it is not long there is just less volume. Unless you are building a hot rod the lag should not be a giant problem. It will sure help with tuning though.

Weapon_R
08-12-2011, 03:11 AM
X3 on that-
Shane, I will be pulling about 100A+, what will it take to upgrade the terminals, and is it adjustable with a pot so I could just clamp an arm onto the shaft for mechanical input from my throttle cable?
At the amperage I'm pulling I'm reasonably sure it would be a good idea to have some supplemental cooling and I have plenty of room under the hood, could you assemble one on a chunk of finned aluminum heat sink so I could direct some airflow over it?

Yes that could work too. Lol :D

Weapon_R
08-12-2011, 03:22 AM
Some details: There is always a delay between the current and the gas available at the output. So, when you step on the pedal, the MAP sensor will activate the PWM, but you will not get the gas in the same moment. The delay is related to the cell. Did you consider this problem?

Yes I have thought of this. I will adjust output based on rpm. The alternator amperage varies with rpm so at idle little current draw is required. This type of setup is most suitable for gradual acceleration. Another way around the delay is to set the unit to increase amperage about 1000 rpm before its needed buying some time. This would again depend on driving style but the point is with electronics trickery and proper tuning I am sure the delay can be brought to a minimum.