What is your overall boost at the manifold?

 

I'm surprised they used a free float housing on the secondary.

 

I don't have a drive pressure gauge, but I see about 70-75 total at the airhorn

 

Whats the A/R on the secondary? 4.4:1 PR on the primary vs 1.3:1 PR on the secondary, the secondary sounds real lazy.

 

I'm not sure what it is, never measured it when I got them and didn't find out. I could always find out. It seems to work well. Spools fast, egt's stay below 12-1300. Tows great

 

Been away all week... As was mentioned, this has turned out to be a very educational thread !!



The ATS 3K secondary is wastegated in the twins configuration.
I was surprised on ABdiesels.com when you pointed out the ATS 3k was NOT wastegated in a single configuration. I did not know that.
It's a little different but it's easy access in the cast iron intermediate hot pipe. This is not my pic but shows the top/secondary 3k turbo wastegate.
That's the 5k turbo on the bottom. My kit is identical except for the lame ATS purple...
The stock turbo elbow & V-band bolt right up to the ATS bottom 5k turbo. This was a really nice feature for me with my exhaust brake just downstream.

ATSTwinsWGAdjusment1.jpg?t=1302308756



Brad's DDP kit is not wastegated which was not my preference but no question his kit works just fine.
On the downside there is nothing to adjust. On the upside, it makes everything simpler & less to go wrong.

It is true that the BD recommends to make sure the top/secondary wastegate is screwed down to never open on their R700 twins kit.

On a positive note, the Cdn dollar is US$1.04 today. Making it an excellent time to make US purchases.

The new & unique Industrial Injections twins config (primary on top, secondary on the bottom) looks good from the top but it looks awkward to me from a hot pipe point of view.
Here is a look at them...http://www.cumminsforum.com/forum/3r...ing-twins.html

Here's a link to the Industrial Injection instructions for their inverted twins:
(7mb PDF file download) http://www.4shared.com/document/xcs0...TRUCTIONS.html

 

Boy that hot pipe is a nice piece of work!..

 

Run you can use regulated air pressure to fine tune the opening pressure on the gate. Of course you don't have drive pressure variable, but sure helps knowing what everything set at. Typically I start at 24-26psi on the secondary. Turbine housing size makes a difference and how much power the truck makes. Less pressure the gate opens sooner and push the load more to the primary. More pressure just will load up the secondary more. I prefer the in-cab adjuster myself, just easier to tune.

The clip comes off easier if you apply air pressure to the wastegate actuvator. Same goes when you install and reverse the process.

Boost leak check guys, more boost cause more air leaks.

 

Just found this interesting Garrett technical paper on why it uses coolant filled bearing housings.
http://www.turbobygarrett.com/turbob...te_Papers.html

 

Good info.^^^ Still glad I went with Garrett. The BB setup is money. I put my little hybrid 17/22 Garrett on my TDI through torture zero issues so I now they're great turbos.

 

Oh Mike, did you know you are building me some twins?? Brett does!!

 

Cool writeup. Some of the industrial machinery I see have oil accumulators that are in line with the turbo oil feed line that will inject oil once the engine shuts down and oil pressure drops off. Others have post lube systems. Not many have center section water cooling.

 

I was thinking about trying out an oil accumulator, as these GT series garrett will spin for 6-10seconds after you shut-off the truck. They don't use much oil flow as journal bearings and have an inline oil restrictor. The earlier GT didn't have a restrictor built in, just had a bolt on restrictor, the new stuff have them built into the bearing housings.

 

LOL, yeah I keep him in the loop, after all he does the turbo purchasing...

 

I forgot that.. with the oil restricter orifice in the flow, the oil doesn't flow through that much. You need the water cooling more so with the rolling element bearings. Makes sense.