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BD Quick Spool Valve Install with Pics

sshewins said:
Makes me wonder if this would "help" other turbos as well? Or is this really only beneficial to non-wastegated turbos.
Click to expand...

Well, it depends on the application.

Wastegate or not isn't really relevant in the context of this application.

Generally, if you have a single turbocharger that has an exhausting housing that is a bit large for the application (and have a divided volute and common manifold) then a diverter valve can be used to direct all the exhaust flow into one volute. In essence, making for more pressure as seen by the turbine.

To draw an analogy; it's like using a garden hose to spin a wheel on your lawn mower when cleaning it. Open hose makes the wheel spin. Stick your thumb over the opening and the pressure increase for the same volume of water passed and the wheel spins faster.

In our use, this means the compressor reaches its effeciency island/rpm range quicker and we see more boost sooner.

Google a cut away picture of a double volute housing and you'll see why it works similar.

That's a little simple, but the nut of it.

A wastegate works more or less in the reverse: it allows you to run a smaller turbo for good low and transient response while attempting more flow higher ( ie
: wastegate opens limiting boost but also attempting to "pass more gas" like a larger turbine housing)

Wastegates also have an additional design limitation of exhaust gas rejoin flow. Basically, the exhaust from the wastegate can mess up the main flow depending on how it rejoins the main discharge ( ie: 90 degree rejoin = bad). This leads to problems with efficiently exhausting the main flow.

But that's a subject for another thread....
 
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Thats a good way to reduce the lag, especially for the high altitude driving. For the price it would be great if it came with an electric actuator that could be controlled to pop open under low load where you dont need boost. That was the main concern before, possibly losing the MPG improvement from the bigger housings that flow well rolling down the interstate. Good on you for getting it done and testing it out. Did cruise boost increase much after putting it on?

Might be able to find a dual ball bearing turbo that spools faster for a little more dough than the combo. Can't wait to see the torque curve comparison, after the printer malfunction last time.
 
yeah. I hope the printer works to. And actualy cruising boost is only slightly up. At 65mph i would usualy run no boost. Now i only run 2-3psi. So far just by knowing how i drive and how it affects my fuel gauge, MPG seems to be the same. Will do a mileage test when im done playing with it haha
 
Just thinking out loud here, but wouldn't this allow us to utilize even larger turbos, kinda like what 6.2 uses? (Sorry, can't remember if was an hx 55, or something else)
 
I can't wait to see a video of it in action.

I'm running the ATT right now and would be curious as to how much the lag would be reduced running this product.

Although for the cost of the ATT and the cost of the BD valve together you could find something that would perform better with alot less fabrication.

The spool valve theory has been out there for awhile and should be a pretty good tuning tool for gaining back the bottom end lost by running a turbo that doesn't have optimal bottom end spooling capibilities.

Kind of like have a poor mans compund setup if it gets the desired results.

I'm looking forward to seeing your results.
 
robzombie4551 said:
I can't wait to see a video of it in action.

I'm running the ATT right now

I'm looking forward to seeing your results.
Click to expand...


Are you running the tune designed for the HX clone on the ATT? Fueling properties of the tune designed for the HX clone? Maybe your tune should be optimized for the ATT if it isn't then the test is not relevant without a tune optimized for the turbo like your tune is for your HX clone. ? If you have lag with the ATT your truck has a mechanical problem or it isn't tuned properly or you are one of the few out of over 100 plus people that have a special truck. Or you have an agenda.

I also spoke with a few people that have shaft play with the Hx clones you and Buddy have been recommending and more than a few have said they don't like the way the turbo falls off when the waste gate opens. Have more been having excessive shaft play?

Send 6.5 L your HX clone so we can test the clone on a truck that we have dyno numbers from the ATT, so they can compare the tubos on a dyno not just your butt dyno. Lets put up or shut up or are you afraid to have someone else do a test? I am sure many people hear would like to see 6.5l run the turbo on his truck

SO when are you sending 6.5 l the turbo to test? Let's do a real documented test without tuning anomalies?

Also my switchable tune seems to have lost the ability to recognize the switch from tune to tune. Just started to show up. The tunes either degraded or the programming is corrupted it has a glitch at a specific accel pedal and fuel rate in one tune then at different spots in two others, annoying to say the least. Had to ditch one of the chips with the switchable tune because two tunes failed.

Going to send it out to someone here to get it looked at. So at this juncture I wouldn't recommend it from my experience maybe it is just my truck ? just my observation.
 
Slim Shady said:
Are you running the tune designed for the HX clone on the ATT? Fueling properties of the tune designed for the HX clone? Maybe your tune should be optimized for the ATT if it isn't then the test is not relevant without a tune optimized for the turbo like your tune is for your HX clone. ? If you have lag with the ATT your truck has a mechanical problem or it isn't tuned properly or you are one of the few out of over 100 plus people that have a special truck. Or you have an agenda.

I also spoke with a few people that have shaft play with the Hx clones you and Buddy have been recommending and more than a few have said they don't like the way the turbo falls off when the waste gate opens. Have more been having excessive shaft play?

Send 6.5 L your HX clone so we can test the clone on a truck that we have dyno numbers from the ATT, so they can compare the tubos on a dyno not just your butt dyno. Lets put up or shut up or are you afraid to have someone else do a test? I am sure many people hear would like to see 6.5l run the turbo on his truck

SO when are you sending 6.5 l the turbo to test? Let's do a real documented test without tuning anomalies?

Also my switchable tune seems to have lost the ability to recognize the switch from tune to tune. Just started to show up. The tunes either degraded or the programming is corrupted it has a glitch at a specific accel pedal and fuel rate in one tune then at different spots in two others, annoying to say the least. Had to ditch one of the chips with the switchable tune because two tunes failed.

Going to send it out to someone here to get it looked at. So at this juncture I wouldn't recommend it from my experience maybe it is just my truck ? just my observation.
Click to expand...

WOW. Really?
 
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