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BD Quick Spool Valve Install with Pics

personally I'd want a vac operated system that failed in the open position. truck would act like it normally would without the QSV
 
Big T said:
Didn't think of it being closed at low boost unloaded highway speed. That's a real issue and further pushes towards developing a vacuum operated QSV. I know Slim is working on it and I'll place my trust in him.
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Stage 1 in the developement could be a vac override or a solenoid w/ mech override set to a toggle to be flipped and set to open, then back down to provide performance.
 
Big T said:
I like the idea, but would expect fitment issues. Basically it would be a low boost bypass of the QSV but you need room to fit it between the QSV and the manifold and between the QSV and the turbo. It would create a stack so high, the turbo would not fit under the hood.

I do like the size of their boost actuator.
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Thought of that also. Was thinking of remote mounting the turbo possibly. Just brain storming at this point.
ak diesel driver said:
personally I'd want a vac operated system that failed in the open position. truck would act like it normally would without the QSV
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If its not allready that way a simple spring would make it so.
 
Guys I have my machinist working on it and also have a prototype already made but running into some issues with the valve actuation. There are a few ways to mount the vale on the unit each has benefits but each also has a different arc to move the arm through it's full motion without binding. Remember vacuum actuators are linear and the arm travels in an arc albeit a lesser arc closer to the shaft but none the less an arc. I want this to be bullet proof and fail open.
 
Burning oil said:
Dennis do you think the BD QSV being closed during low boost will affect MPGs?
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I do think we will lose some MPG because of the diverter valve if it is on at anything above 1700 rpm. At least from what i have seen running tunes and playing with some of the issues the diverter valve creates. Under light load it may not be that much of an issue, it is when we are under load that it would need to be off or mostly off.
 
I didnt really notice a change in mpg with mine. I am averaging 18.5mpg mixed driving and that is with the valve never opening.
 
6.5L said:
I didnt really notice a change in mpg with mine. I am averaging 18.5mpg mixed driving and that is with the valve never opening.
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That's with the larger exhaust housing correct? I still think the stock wastegate control system with a GM8 actuator hooked up with a slightly tweaked boost table would work out nicely. The stock system is already set-up to open up around 7-8 pounds of boost at WOT, and later revised tunes from GM would hold boost around 1-2 at cruise. It wouldn't be hard to make it open at say 1500 RPM's at 30% throttle and below, but close off at idle to improve throttle response. To make the valve fail to open would simply involve a standard vacuum actuator, but offset mount the valve to the shaft so the exhaust pressure would open the valve. The only real problem is finding a setup that can sustain 1500 degrees or so for extended periods as those kinds of temps could easily be reached on a long grade towing. And the last thing you want is to have a piece of shrapnel coming loose and going through the turbo.
 
Yeah, larger housing, although I didn't notice much of a change in mileage when i swapped housing. Maybe .3-.4mpg less with the smaller housing depending on conditions
 
6.5L said:
Yeah, larger housing, although I didn't notice much of a change in mileage when i swapped housing. Maybe .3-.4mpg less with the smaller housing depending on conditions
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Good information to know.
 
6.5L said:
Yeah, larger housing, although I didn't notice much of a change in mileage when i swapped housing. Maybe .3-.4mpg less with the smaller housing depending on conditions
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I'm just thinking the larger housing is helping your mileage with the QSV installed. Essentially the QSV with the larger housing reacts more like the small housing without when driving empty, but gives you the extra exhaust flow in the upper RPM's to keep the engine breathing and the boost in a good range for a 6.5.
 
I'm not going to say it doesnt help mileage, I just didnt notice a significant change unloaded. Its hard to say since some days all you do is drive in the nasty wind then some days its calm, so it could be accounted for by other variables. Who knows. I like the idea of the vacuum operated system. Hope we can get something developed soon
 
Can you talk about the smaller vs larger housing? Is that an option when you order the ATT?
 
No. it was a fluke from the factory. They ended up with some up-sized housings. I got sent one when I ordered mine. Slim was nice enough to send a regular sized housing, but I held on to the large housing for shits and giggles.
 
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