Any Feedback on the BD diverter valve?

[Tuesdak]

Ah That's good to know. So it will work that way even with a split t4 manifold ? Sorry for the ignorance. Just trying to exploit my options.

Yes it merges the split when closed for spool up. It keeps the 'split' intact when full open. The valve moves vertical and the manifold 3x3 cylinder split into the turbo is kept. BTW that's a T3 to a T4 pictured above and BD makes many flavors to bolt up what you got.

 

[dsldude]

Got it. Awesome. Do you think I will have to modify the down tube or anything else to make this thing fit? See Pic.

 

[Gumby79]

JDoremire I just finished reading 6.5l's write-up when i got the notification of responces to this thread. Yours is next.
Dose orientation matter?
Judging from the cutaway images of a devided exhaust housing the rear (closest to the down pipe) air flow is close to 180° change of direction through the turbine. The front is less than 90°. For this reason I'm thinking feed through the rear. This also moves the concentration of heat further from the center housing.
What kind of effects did the valve have on EGT? I am expecting it to rise 2-400° at cruse 70mph in the flats valve full closed?
Any ideas on drive pressure Vs boost? This was the warning the BD rep gave me for use with my intention of sticking to the 2500 gov till other goals are met.

dsldude
the butterfly type dose block and requires an open manifold to alow diversion to happen. So not for stock cummins manifold. But available in T3
The BD spool valve is for devided or open manifold, available in 3 flavors ;T3/T4, T4/T4, T4/T6 (T3/T3 is insufficient demand). So if you are T3 then a T3/T4 adaptor is needed. On DP yes the write-up from 6.5L said 3" added. +1/2" for the extra adaptor if staying in a T3 like me.

1/2" T3/T4 adaptor over or under the spool valve? If under open or devided?

 

[Tuesdak]

EGT doesn't matter on a 6.5 like it does on a Cummins. I have attempted to get a 6.2 with uncoated pistons to I TRIED TO BY-PASS THE CUSSING FILTER melted pistons out the exhaust and sustained 1550 EGT towing during said attempts. All it did was give me heartburn and turn the turbo blanket black. 6.5's have coated piston tops and that helps engine oil live to the 2500 mile change interval. So EGT was not a concern that I watched.

If you look at the diverter valve itself you see the "angle" it is at. This angle diverts 1/2 the manifold into the smaller wheel section of the turbo. IMO it would be fine in a devided manifold, but, it may need more room for decent exhaust flow. Just saying the valve doesn't block. Doesn't mean it's a recommend configuration.

This brings up install orentation. It has to be mounted to divert away from the larger part of the wheel. So it would keep heat away from the center section in theroy. I had to move AC lines and coolant surge tank as I could not spin the BD 180 degrees and have it work.

In practice keep in mind this was designed for a Cummins and 'we' threw it on 6.2/6.5's without piston oil squirters, piston coolers. I ruined, via overheating, conventional engine oil as exhaust restrictions keep heat in the engine. Synthetic was able to take the heat. Yeah drive pressure goes up when closed. The large turbo I was using had a 1:1.1 drive pressure ratio. Way better than factory. Did not measure BD valve, but, when open it would be the 1:1.1.

Once you build boost the valve opens up and is more or less out of the way. What boost do you have at 70 MPH cruise now? This will tell you if the valve would be open or not.

 

[Gumby79]

650-700 depending on wind 2.5-3psi with full exhaust manifold wraped from head to down pipe. Was 750-800egt and 1-2psi before the wrap . I have found my EGT to be more of an indicator of boost than speed.. I can hold 60-80mph at 600-800EGT at 1-5psi. (0-3psi before the wrap)

 

[Gumby79]

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