I'm assuming any of the big vendors include this with a twin setup, but where would one go if they were building their own?
I've seen some for smaller cars, mostly imports, I'm quite sure these wouldn't be near big enough to service a CTD?
And what about the blowoff valves? Just looking for a source.

Any help's appriciated,

Ian

 

I thought I read somewhere that BD sells what your looking for.

 

BD has the Turbo Guard, which is what your talking about

 

Diesels don't need blow off valve like gassers.

Dean

 

See how many twin kits Piers sell's without "pop-off" valves.

 

my twins have no blow off valve

 

There are a number of external wastegate manufacturers to choose from, but the most popular are Tial and Turbonetics. Most are in the 35-45mm range for opening size. Obviously a hotter setup will require a larger wastegate, but you don't want one that is bigger than you need, either. The wastegating can also be done via the internally wastegated housings, but the flappers are often not large enough to flow enough gas to keep the pressures right. On my setup I am running both an internal and an external to keep things where I want them. I also have two pop offs in the pipe going to the intercooler from the small turbo to keep my max boost down should the wastegates fail. Look at your nearest industrial supply store for a "pressure-relief" valve (not a pop valve... they open all at once). I have two mfr. by Watts, and they are adjustable to open at whatever pressure you want within its given range. IMO it is not good practice to use the pressure relief valve as a means to control boost, although some do it and I did for a little while. They are good for emergency boost control (i.e. wastegate fails), but they a very inefficient way to keep boost at a certain level. Hope this helps....

John

 

Here is two sources
http://www.turboengineering.com/wast...ste_gates.html

http://www.tialsport.com/

Opps! Banshee beat me to the keyboard!

RJ

 

If you have a small set of twins they will max out and there is no need for a blow off valve. My blow off valves there are two are set at 70#. I can reach 73# max boost, they are needed because my twins are able to make over that and I want to keep under 75# even if the set-up can make more.
Bruce

 

Woops, I didn't know you guys are running seq turbos. I stand corrected.

Dean

 

I wasn't planning to use the blowoff valve to control boost. I plan on putting a manual trans on my truck this spring, and as I understood it as you have the boost pressures up and shift all that pressure tries to go back through the turbos now that the engine has dropped rpms. So that in turn slows the turbos down and reduces your spoolup after you shift and are back on the throttle. Blowoff valves are supposed to prevent this? could be wrong, maybe it doesn't apply to diesel motors because of the lower rpms? I plan on putting a 4k kit in it, so I'll be up there with the rpms, it's probably a marginal performance gain if any, but figured it wouldn't hurt it.

 

The reason for the BOV in a gasser is that you have a throttle plate that closes when you let of the gas pedal. The BOV relieves the sudden pressure spike. Diesel engines have no throttle plate so they have a much less or no pressure spike. I am not sure if you need one in your app.

Good luck on your project

Dean

 

That would be true,,,never thought about the absence of the throttle plate,,,

 

Very true about gassers having a higher pressure spike after quickly letting off the throttle because of the throttle plate. But, a high hp diesel's problem is the fact that they push alot more boost. Letting of the fuel at 70psi is hard on the turbo(s) becuase of all the boost rushing back through the compressor. A BOV would help prevent damage and allow faster spool-up when shifting. Most of this apply to manuals. I dont think its much of a problem on autos, but could be wrong.

 

Well how would you hook that up to open with you shift? The gassers' work off vaccuum I know, but last I checked my CTD didn't have any vaccum lines lol. like I said, in spring, I'm going to an NV5600, and after that I think my $$$ will be gone for awhile so blowing up turbos wouldn't be good

All the responses are appriciated guys,

Ian