The BOMB'rs new set of lungs....

[DoghouseDiesel]

I'll let ya know what I find.

There's a few things I'm looking at with this.

[FUBAR]

Definitely watching this one...curious to see how the tuning plays out. Les's got me dreaming 'triples' now.

[2007 5.9]

Mmmmm triples....mmmmm

[DoghouseDiesel]

Mmmmm triples....mmmmm

Smack it up, flip it, rub it down......

[DoghouseDiesel]

Definitely watching this one...curious to see how the tuning plays out. Les's got me dreaming 'triples' now.

This will be a whole new tune for this configuration.

Not just because of the turbos, but I'm also changing to a larger cam, a set of Exergy injectors to flow 400 lph at 3000 uS at 26k psi, both pumps are getting worked over, and I'm waiting on the head to come back from the machine shop so I can cut the intake plenum off and put one of Shane's XHP side draft manifolds on and port / polish it, as well as change all the intake valves over to exhaust valves.

[2007 5.9]

Are you going with the 143* marine nozzles or staying with the factory 124* ones?

Who's cam and what size??

And I assume Todd is "working" your pumps...lol!!!

[L31Sleeper]

I saw this "unconventional" set up and had to chime in. I really don't think the compressors will care either way, but I definitely see the small turbine chocking the larger turbine unless you install a waste gate between the turbines. If you place a 60mm waste gate in that 90* elbow, set to open when the small turbo tops out the large turbo will think it's dumping into atmosphere.

trying to help
-Justin

[DoghouseDiesel]

Justin,

That's already part of the plan.

What I want to do first is see just how much back pressure is in the hot pipe and how it effects the pressure ratios.

That small 1/8 NPT port you see on the hot pipe is for the fitting for the drive pressure. The Steed Speed manifold is the competition version, so there are already 6 ports tapped into it for various sensors.

I already up'd the size of the turbine housing that was on the 475 from a 1.10 to 1.25, so it really shouldn't present a problem for the Garrett. Also, both turbine housing and the hot pipe will be getting ceramic coated inside and out. I already have a blanket for the Garrett's turbo, so all that heat is going in the right direction.



Here's the reason I don't see much of an issue....

In a conventional setup, with the small tubo on top, you're already choking the engine at the manifold when it has to pass through what is usually a T3 divided flange. This already causes a pressure drop that effects the, what would be the larger turbo down stream, which usually has a T4 or T6 flange and larger turbine. The other effect is the drop in exhaust gas temp that drops significantly after going through the small charger. This also effects the down stream charger.

In this setup, all the pressure and heat is hitting that big turbine first through a T6 flange and a 1.23 housing. Now even though the size of the turbine is pretty large, the turbine wheel is a 93 with an 82 trim, so the exducer is only about 3.5". That dumps into a T4 flanged, 1.25 turbine housing. So, technically, it has enough flow to not back up and dead head the Garrett.

But yes, a 60mm gate is part of the plan, but I want to do some measuring before we go that route. And yes, you are correct that it would be like dump straight into a down pipe, but I want to measure that actual pressure first.

[DoghouseDiesel]

And I assume Todd is "working" your pumps...lol!!!

You know it brotha!

Only the most technically skilled, knowledgeable, and competent hands and minds will touch those pumps. Who better to send them to....



If my sarcasm didn't shine through bright enough, just follow THIS LINK and you'll see what we're talking about..

[L31Sleeper]

How can you take pressure measurements with all that heat ?

-Justin