20psi at 2800 rpm's. 800rwhp. Compound turbos!

[tsuper92]

i'm curious to see if they can keep the 2j head from shooting off the block.the compound's i've seen for the cummin's were small turbo feeding a large.the dp from the first turbo went to the second one's t3 inlet and the compressor outlet feed the larger turbo's compressor inlet.there's a company that sold the piping set-up for like $1200.all you needed was the second turbo and an external wastegate.of course the o-ringed head and a heavily upgraded tran's are a must too.two thing's i'm not ready to spend money on yet

 

[Orion ZyGarian]

I always thought Compound Large Turbo into Small Turbo was done for diesels to achieve 100+ psi boost and isn't applicable to a Gas engine due to detonation?

I've thought about its use, but there's no way 95% of us would be able to usefully use and get worth out of a proper compound setup. A single will do anything we need it, and the gains from using two turbos (be they parallel, sequential, or compound) are most likely out of our financial grasp and feasibility.

It'd sure as hell be "something fun to do in your spare time" though!

 

[tsuper92]

orian your quoting a guy who spent more money on his standalone then a mkIII is worthwe all now if anybody could pull this off it would be him.

 

[Orion ZyGarian]

orian your quoting a guy who spent more money on his standalone then a mkIII is worthwe all now if anybody could pull this off it would be him.

I'm well aware of how much IJ has put into his MkIII. His extensive, detailed experimentation and information is nothing short of invaluable. He's a hero for us 7M guys

 

[IJ.]

I'm well aware of how much IJ has put into his MkIII. His extensive, detailed experimentation and information is nothing short of invaluable. He's a hero for us 7M guys

Gives me an excuse to wear my underwear on the outside

Hardly a hero though I'm just a petrol head that likes experimenting and learning new things!

 

[tekdeus]

Hell, if I had the money right now, I'd go for this turbo setup and the AWD build by those guys in Russia! 800 rwhp with AWD? Now we're talking fast...

 

[IJ.]

You already have the 4wsteer Brad

 

[sk6471]

Wouldn't the big turbine block the exhaust from the first turbine, slowing the spool of the small turbo?

 

[SupaMan]

800 rwhp with AWD?

Say wha? :3d_frown:


on the real. this is pretty cool.

 

[TuRbOdReAmZ87]

Thats nuts!!! :aigo:

 

[RacerXJ220]

So how would a theoretical setup like two custom triple ball bearing S474 and S256 wheeled turbos work out with huge cams and a race ported head assuming as much VE as you could get with the 1J head and a 3.1L bottom end?

What kind of A/R's would you need on the respective hotsides? It seems weird, and I don't know where to start. I was thinking it would be a larger one for both.

Is one wastegate bigger than the other one? Looks like the bigger one controls the smaller turbo? Am I seeing that wrong?

I'd appreciate some input to those questions, as my 1.5JZ needs a new path in upgrades and this is epic sick...

 

[RacerXJ220]

The thing is that my thermodynamics is saying that you will lose some energy in the process thereby making the big turbo even laggier, even with the pressure ratio being better.....

What if one were to use SP's quick spool valve in conjunction with this setup? Would it make a difference in spool for the larger turbo if you just used it on that one?

 

[juhanis]

my brain hurts after looking at that... but it does make sense, imagine trying to find an oil leak on that.

 

[figgie]

What if one were to use SP's quick spool valve in conjunction with this setup? Would it make a difference in spool for the larger turbo if you just used it on that one?

it is simple. You use energy to make turbo 1 spin up = less energy available to turbo #2. Adding the "quick spool" valve is adding even more complexity to a complex system.

 

[IJ.]

xx size hole in the Turbine entry to turbo #1 sets the total volume that will flow through the system.

 

[RacerXJ220]

it is simple. You use energy to make turbo 1 spin up = less energy available to turbo #2. Adding the "quick spool" valve is adding even more complexity to a complex system.

it's really not going to make that much difference lol

If the quick spool was on the large turbo it would help nontheless.

 

[RacerXJ220]

xx size hole in the Turbine entry to turbo #1 sets the total volume that will flow through the system.

What size would be enough for a total volume of air worth 700whp to pass through and still make lots of power down low?

Finding out what number 1 turbo I want to use is my question. Dealing with 3 liters and wanting more power from a compound setup has me thinking my ideal number 1 turbo could be a restriction. Basically, I want the turbo to pass as much air as the larger turbo can push out right?

 

[suprahero]

Jeff, all you need is your pt67...........don't go trying to have the fastest MKIII in Alabama.........:evil2:

 

[tekdeus]

RacerXJ220, read the thread on SF. Many of your questions have been covered there: http://www.supraforums.com/forum/showthread.php?t=527336

 

[RacerXJ220]

Jeff, all you need is your pt67...........don't go trying to have the fastest MKIII in Alabama.........:evil2:

What? Me? Who? You are a very very SILLY person Jay. Of course I mean that in the most sarcastic way possible. It's not all about peak HP on the dyno with me, I really want a flat line torque curve that's mean from 3,000 to 8,500 if I ever wanna go there, just power all the time. Street friendly low boost power that is just enough for some huge rubber drag radials.

Yeah pretty much this kit is going on my car, depends on when it can be made and who can make sure it'll fit into a MK3.

Tekdeus, I looked through the whole thread, and I still demand answers or I'm going to call Chuck Norris. They listed several of the larger turbo combinations, but they don't list the smaller one. I'm thinking a 57-61mm would work well.

I'm trying to find out how the A/R's for the hotside works on this setup and what size will be good.