Has anyone installed the Vargas shotgun yet?

[NoQuarter]

This is similar to work I am doing to run 2 S55 HPFP pumps from the N54 DME.

Have made some good progress but summer time projects like these get less attention.

 

[doublespaces]

I'm in the middle of doing it, I got the bolts in on the bracket but they're bottoming out, any chance the hardware is too long for the a.c. bolts? Instructions say not to use washers but I don't see any other way, otherwise the bracket isn't snug down.

Hey, did you ever figure out the length of these bolts? I need to order one

Pretty sure its an M8 95mm

 

[doublespaces]

So, I got some PTFE stainless lines and fittings and converted the Y hose into something better while I was repairing my broken fitting. The HPFP inlet with the olive is not idea, I'd like to have a custom fitting produced for it.

 

[martymil]

make your own, very easy.

Take your pump to rail line cut the ends off and weld on a steel dash 6 hex base fitting.​

 

[doublespaces]

I thought about having one brazed on. Did welding affect the ID?

 

[Jake@MHD]

It would be nice to just run both pumps wiring in parallel off the DME but it doesn't work and tends to fry the controller. Try at your own risk.

Yea, one pump can draw around 3.1-3.2A at 100% DC. The ATIC chip that monitors the VCV I think was only 4A or 5A capable, so 2 pumps could kill it.

There's also a current feedback loop through the same ATIC chip, similar to a shunt resistor.

 

[martymil]

I thought about having one brazed on. Did welding affect the ID?

Nope, its still bigger than the olive connection

The only reason I done this is because I lost the olives and the alloy fitting has to many connections so I simplified it by making this.

This works the best and minimises the number of connections and possible leaks

 

[martymil]

Yea, one pump can draw around 3.1-3.2A at 100% DC. The ATIC chip that monitors the VCV I think was only 4A or 5A capable, so 2 pumps could kill it.

There's also a current feedback loop through the same ATIC chip, similar to a shunt resistor.

Is there a way to control the second pump via the dme in anyway like a second external control chip and the dme then can control the second pump just like the flex fuel box

 

[NoQuarter]

A

Is there a way to control the second pump via the dme in anyway like a second external control chip and the dme then can control the second pump just like the flex fuel box

A Simple MOSFET circuit would take the DME pwm and then drive the pumps

 

[Jake@MHD]

Is there a way to control the second pump via the dme in anyway like a second external control chip and the dme then can control the second pump just like the flex fuel box

Yes, very nicely too. I'll have to check what amperage the additional output can handle, but at most a simple small circuit would be all that is required, with all logic residing in the DME.

Unfortunately, this project is queued behind some bigger ticket items in my workload right now.

A Simple MOSFET circuit would take the DME pwm and then drive the pumps

Correct, but the DME also expects a certain L/hr of flow for a given amperage, among other things.

 

[Rob09msport]

Yes, very nicely too. I'll have to check what amperage the additional output can handle, but at most a simple small circuit would be all that is required, with all logic residing in the DME.

Unfortunately, this project is queued behind some bigger ticket items in my workload right now.



Correct, but the DME also expects a certain L/hr of flow for a given amperage, among other things.

If dme would have issue with too much flow per amp wouldnt current pi and shotgun solutions cause error or are you saying it would try to adjust and would just be all over place

 

[Jake@MHD]

If dme would have issue with too much flow per amp wouldnt current pi and shotgun solutions cause error or are you saying it would try to adjust and would just be all over place

Not sure what they're doing currently. But at a certain point, L/Hr requested through the HPFP reaches a cap of 255L/hr. At this point, PI or a 2nd hpfp is definitely required, so operating in this range the DME wouldn't care.

I imagine it would complain at lower demand levels if duplicating the signal to a second hpfp so that both are always active. The second should be turned on and regulated as needed.

 

[martymil]

This is good to hear, just have to wait I guess but very impatiently lol

Its not a necessity as the current aic solution works quite well but it would be nice if it happened so I understand it not on the urgent list.

 

[Erichale77]

I'm patiently waiting for that as well Jake

 

[Rob09msport]

Not sure what they're doing currently. But at a certain point, L/Hr requested through the HPFP reaches a cap of 255L/hr. At this point, PI or a 2nd hpfp is definitely required, so operating in this range the DME wouldn't care.

I imagine it would complain at lower demand levels if duplicating the signal to a second hpfp so that both are always active. The second should be turned on and regulated as needed.

So If a single barrel outflows a stock lpfp and you need a stage 2 to utilize does this mean that we aren't using it to fullest extent,or once above 255 it just goes balls to wall and valve is wide open with no metering?

 

[doublespaces]

Had this welded on by @BlackMarketRacing the other day. It fits great and feels so much more snug.

 

[martymil]

This is the best way and will not break or come loose.

Only if you could buy these fittings but no one makes them out of stainless

If there was big enough order of lets say 500 I could get them made.

 

[BlackMarketRacing]

Had this welded on by @BlackMarketRacing the other day. It fits great and feels so much more snug.

Glad to see that worked out well for you!

 

[zmon1300]

Anyone figure out a work around to get the shotgun to fit XI cars? I would love to ditch PI if I had a solid solution...

 

[martymil]

I could be wrong but there is not a big market for XI and the development costs would be far greater than any profit to be made.