[dougsfastz]

I believe I have one of your older black controller boxes in my GN. Here is a pic.

How does the DevilsOwn controller box provide voltage to the pump? Meaning how is voltage supplied to the pump during the ramp up gap between the two PSI settings? Is it cycling 12 volts or is it ramping up the voltage gradually. What kind of PSI and voltage should I see when it's on 100%? I'm running a shur flo 8009 pump. Is my box any different then the current ones you sell?

I've had this homeade kit for a couple years now and it works flawless. I just want to make sure I know how the box works.

Thanks,

Doug D

[dvldoc]

Another undercover GN customer

The controller uses Pulse-width modulation control which works by switching the power supplied to the motor on and off very rapidly. The DC voltage is converted to a square-wave signal, alternating between fully on (whatever imput voltage) and zero, giving the motor a series of power "kicks".

Our controller operates at up to 1 KHZ so (It does this up to 1000 times a second)



If the switching frequency is high enough, the motor runs at a steady speed due to its fly-wheel momentum.

By adjusting the duty cycle of the signal (modulating the width of the pulse, hence the 'PWM') ie, the time fraction it is "on", the average power can be varied, and hence the motor speed..

Here's the general operation of the unit.

Then the unit will read the dial settings and calculate the slope of the progressive control.

Map voltage is read and converted to a boost value
Pump duty cycle is calculated based on dial settings and slope

When boost PSI reaches the START setting the pump will come on with a 15% duty cycle
It will ramp up to 100% as boost approaches FULL setting.
The pump voltage percentage will increase with a 0.2 pound increase in boost.
This means the voltage will step up 5 times over an increase of 1 PSI making a very linear response curve

For ease of adjustment, each dial has 21 settings that are incremental
There is a setting for every hash mark and another setting in-between each
Having the arrow close to a setting will provide the exact setting.

For example the 12 o'clock position on the START dial of a 2 BAR unit is a PSI setting of 7
It will also be a 7 if the arrow is 6 degrees to right (or left) of 12 o'clock
once it is beyond half way to the middle the setting will be 7.5PSI
This allows the user to easily set the unit to exact values without having to be fussy with the dial

For reference the Dial settings for each version are as follows:
If the FULL setting is set to a lower PSI than the START setting, the start setting will be ignored and the pump will switch on to 100% when PSI is above FULL setting and will switch off when it is below the FULL setting.

[dougsfastz]

Great explaination, thanks!

What would the PSI be for the 8009 Shur Flo pump at 100% duty cycle? What voltage is it sending the pump at 100% duty cycle?

Doug D

[dvldoc]

Originally Posted by dougsfastz

Great explaination, thanks!

What would the PSI be for the 8009 Shur Flo pump at 100% duty cycle? What voltage is it sending the pump at 100% duty cycle?

Doug D

Nozzle size determines PSI of the pump. On average most cars when they are running put out around 13.5 to 13.8 volts so the controller is putting out exactly what it is getting in. It has a internal voltage regulator so your voltage is always constant. So if your putting in 13.8 volts the pump is getting 13.8 volts at all times. The voltage regulator is to keep it smooth our unit has one of if not the best liner response out there.

Heres the output you'll see on our pumps. Other pumps will be a bit lower since ours is custom and has a different Cam ect.

This is at 13.25 volts, The higher the voltage the more psi.
M2 230psi
M3 225psi
M4 215psi
M5 190psi
M7 180psi
M10 170psi
M12 Not tested
M14 155 psi

[dougsfastz]

Originally Posted by dvldoc

Nozzle size determines PSI of the pump. On average most cars when they are running put out around 13.5 to 13.8 volts so the controller is putting out exactly what it is getting in. It has a internal voltage regulator so your voltage is always constant. So if your putting in 13.8 volts the pump is getting 13.8 volts at all times. The voltage regulator is to keep it smooth our unit has one of if not the best liner response out there.

Heres the output you'll see on our pumps. Other pumps will be a bit lower since ours is custom and has a different Cam ect.

This is at 13.25 volts, The higher the voltage the more psi.
M2 230psi
M3 225psi
M4 215psi
M5 190psi
M7 180psi
M10 170psi
M12 Not tested
M14 155 psi

Cool, I'm running a M15 nozzle, but it maybe less PSI then above since it's just a standard Shurflo.

Thanks again,

Doug D

[pacemkr86]

more pics of the Buick Doug

[dougsfastz]

Originally Posted by pacemkr86

more pics of the Buick Doug

http://www.alcohol-injection.com/for....html#post6268

Doug D