Competition blowoff valve question...

[GOT-Torque]

Is the only purpose to keep from barking your turbo (or turbos) when you get out of the boost very quickly? Thanks

 

[Pat@BD]

That is what we make the Turbogaurd for is to prevent damage from an off throttle surge. Blow off valve is a very inefficient way of controling how much boost you make.

 

[the whale dog]

not to steal the thread but what damage is done when the turbo barks on sudden letoff of the throttle?

 

[Pat@BD]

What happens is you have all this exhaust being generated by your engine. That is spinning the turbocharger. The charger is then taking intake air and pressurizing it and sending it through the intercooler then into the engine. When you get off the throttle quickly you no longer have any exhaust driving the turbo, but you still have pressurized air on the intake side. This pressurized air is looking for the easiest way out, which is not into the engine. It will actually try to spin the turbo backwards, which can cause the shafts to break. The turbo gaurd we have is hooked up between the intercooler and the intake. When you back off the throttle quickly it will release that pressure to atmosphere then close up right again saving the turbo.

 

[MRector]

it will release that pressure to atmosphere then close up right again saving the turbo.

You dont happen to have any sound clips or video w/ sound one of your turboguards, do ya?? Never heard one I dont think and just curious to what they sound like.



thanks, mike

 

[JasonCzerak]

What happens is you have all this exhaust being generated by your engine. That is spinning the turbocharger. The charger is then taking intake air and pressurizing it and sending it through the intercooler then into the engine. When you get off the throttle quickly you no longer have any exhaust driving the turbo, but you still have pressurized air on the intake side. This pressurized air is looking for the easiest way out, which is not into the engine. It will actually try to spin the turbo backwards, which can cause the shafts to break. The turbo gaurd we have is hooked up between the intercooler and the intake. When you back off the throttle quickly it will release that pressure to atmosphere then close up right again saving the turbo.

Isn't this the very definition of a "blow off valve"?

 

[Pat@BD]

You dont happen to have any sound clips or video w/ sound one of your turboguards, do ya?? Never heard one I dont think and just curious to what they sound like.



thanks, mike

Sorry dont have any sound clips of it. It isnt going to be as loud as a import car, but it is the same sort of sound. Just a quick pressure release. The valve is open for less than a third of a second.

 

[Pat@BD]

Isn't this the very definition of a "blow off valve"?

A blow off valve by definition is when you have boost pressure overcoming a spring pressure allowing the valve to be pushed open to control boost. You can also hear them called Pop Off Valves. If you wanted to get into the nitty gritty of it there really isn't a definition for "blow off" valve. Just different interpretations of what it does. The valves that we use are used in some Blow Off valve kits. Just a different method of using them.

 

[GOT-Torque]

How do you know if you need them or not? Would a manual truck need it more than an automatic truck? Or can you just control it with your right foot and try not to ever jump out of the boost that fast?

 

[Highfinance97]

Would a manual truck need it more than an automatic truck?

Id say yes,

A stick truck would need it more than a auto. because an auto can shift quicer than a stick (obveisly) and when YOU shift your letting off the pedel which inturn stops the drive pressure.



Correct??



Michael

 

[Highfinance97]

not to steal the thread but what damage is done when the turbo barks on sudden letoff of the throttle?

This could happen :-laf :-laf :-laf

Michael

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[Pat@BD]

The manual transmission is definitely more susceptible to damage from the off throttle sure. We do install them on both manual and automatic transmissions.

 

[BigDan]

The Turboguard will give you poor acceleration in a manual truck since it blows all of your boost away during every shift. If your running a larger then stock turbo thats a major PITA. I have a friend that took his BD turboguard off his truck and its now sitting in a box. It took him many hours to dial it in so it would work properly. Yes it worked but he couldn’t live with the lost in boost every time he shifted.



He said it would probably work just fine in an auto since you don’t have to let off during acceleration.



BTW its not a simple bolt on application. It take some fabing and testing and re-shimming to get it to work properly

 

[JVolpe]

Michael at Hot Rod Diesels installed mine a few weeks ago. I am satisfied with it. It is definitely not a simple install. There is quite a bit of fab work needed. Cut, weld, paint the valve itself into the intake tubing. Then there is a lot of wiring, tubing, relay, controller to get connected, then mounted and controller ran into the cab. Then you have to tune/adjust the controller for your specific truck and your specific perferences. Glad I did not tackle the job.



Mine does stop most of the barking I had. Mainly accelerating onto freeways or traffic and then letting off. That use to irritate me. It does not stop all barking however. If you are at full throttle through OD lockup mine will still bark. There is no TPS backoff to trigger the BOV.