Staged turbosystem

[JBrady]

I have often pondered building a staged turbosystem. IMO would be very good for the 2jzgte applications.

Build a manifold for a BIG turbo, one "wastegate" outlet would go to a small turbo, a redirect valve after small turbine feed port would direct all exhaust to the small turbine. Small turbine outlet would route back to big turbine inlet after redirect valve.

Small compressor would lead to big comp inlet. One way pressure valve at big comp inlet before small comp port would boost engine through big comp.

As RPMs rise the exhaust redirect valve opens directing flow to big turbine. Once spooled big turbo takes over. Wastegate controlls peak boost.

So, imagine my suprise to find this picture.

 

[JBrady]

Can't say if this EVO has a staged system or not (probably not) but check out this mean 4 banger.

http://www.youtube.com/user/roadtesttv#p/u/10/j2A5BYFQ1u4

While your there at Roadtest TV check out the CL65 vs Mustang Cobra

 

[cribbj]

John, have you seen BoostLogic's 2 stage turbo system for the 2JZ-GTE?

 

[XR8tt]

Prefer the KISS system myself !!!

 

[JBrady]

John, have you seen BoostLogic's 2 stage turbo system for the 2JZ-GTE?

Wasn't aware it existed!

http://www.boostlogic.com/xcart/product.php?productid=160&cat=9&page=1

http://www.6speedonline.com/forums/...ed-my-new-turbo-set-up-520-ftlb-tq-4krpm.html

Interesting they blow through the small turbo. Not sure how they are controlling the system but will try to find out more.

OK, maybe the mother thread here. 28 pages so I will review in time.

http://www.supraforums.com/forum/showthread.php?t=527336&page=1

 

[spf_lexus]

So the small snail dumps it's pressure into the large snail's inlet? I'm curious how the small snail mounts to the manifold. The 1st pic shows the majority of it's workings but I can't picture the exhaust housing would mount. Possibly large snail's downpipe routing into the small snail's exhaust inlet?

 

[XR8tt]

They usually run two wastegates with the smaller turbo wastegate exhaust venting into the bigger turbine housing.. The wastegate on the larger turbo controls the actual boost... As per Subaru's twin turbo Liberties...
The compressors are not compound ...

Here's another fine set up which is limited to 1500 h.p...
http://www.nizpromarine.com.au/the_engine.html

 

[JBrady]

They usually run two wastegates with the smaller turbo wastegate exhaust venting into the bigger turbine housing.. The wastegate on the larger turbo controls the actual boost... As per Subaru's twin turbo Liberties...
The compressors are not compound ...

Here's another fine set up which is limited to 1500 h.p...
http://www.nizpromarine.com.au/the_engine.html

That is definitely a fine set up. Do you know what 32v DOHC engine that is based on? Maybe a Ford?

I again wonder on the controls. The compressor routing is not shown but the exhaust is visable.

 

[JBrady]

The Boost Logic system looks like a hybrid sequential/compound system with the boost from the large turbo feeding the inlet to the small turbo.

The exhaust flows through the small turbo first then to the large turbo. A wastegate bypasses the small turbo to feed the large turbo for the transition.

I am wondering about the dynamics of the small compressor dealing with the full flow of the large compressor and if there is any compounding of boost or if the small turbo begins to "freewheel" and simply allows the boost to flow through unaltered?

 

[XR8tt]

It looks like our {Aussie} Ford Boss engine here 4v 5.4.. With forged rods, pistons & oil pump...
In alloy block .. Our Boss "at pressent" is cast iron...

Turbo's work well on long stroke motors...
Sheesh do the exhaust manifolds have to be so long ??

 

[White ls400]

i think its a Nissan vk56de, well thats what they used to use

 

[JBrady]

i think its a Nissan vk56de, well thats what they used to use

Yes, that would be it. The machined or made new cam drive covers and made some other changes but the nissan 5.6 liter is the base.