Theoretical Question - Real twins

[Mikey]

Anybody try running 2 stock variable geometry turbos. Does the vvt have any effect on the ar? Since the turbo's are variable, maybe they could be programmed for a twin setup by controlling the vanes?

I was thinking of running a second stock lbz vvt by rerouting the passenger side manifold directly to the 2nd turbo where a compound would sit and using block off plates on both turbos.

 

[Slammed2007Lbz]

I believe what you a tryin to do by what you said is run a parrellel turbo setup which has been done but you use real small turbo with parrellel turbo kits because you are relying on 4cylinders to light each turbo instead of all 8. From what ive seen you would be much better suited with doing a stock/s475 compound turbo kit

 

[Mikey]

any technical info on ar?

 

[TeaBagger2006]

I like the idea, but I wonder how you would control both turbos (vanes). I would make some sweet intercoolers for each turbo then fab up a snazzy intake manifold. But as far as a stock lbz turbo goes, are you just going to make something fit the exhaust inlet because the stock crap is just one big piece. I think having equal lenght exhaust piping would be critical for something like this....... I don't think lbz turbos would be practicall but 2 precision 66mm units would be tits and really fun

 

[SSchmi5519]

The turbo vanes would not be able to be controlled independently with a single ECM.

 

[BLKLMM]

SucksI wanted to run my stocker on my bros honda

 

[Mikey]

Wouldn't need to control them individually, just make them simultaneously spool together.
I've read about stock Toyota Supras having twin vvt's.

 

[Cornell]

The turbo vanes would not be able to be controlled independently with a single ECM.

Ideally you wouldn't want to have them independently controlled. You'd want each VVT to be in the exact same vane position at all times.... right?

 

[Mikey]

That is what I was thinking.
Does anybody know the turbine and ar specs on the vvt?

 

[1lowdiesel]

How would you go about the pedistal? if you kept one charger in the valley and remote mounted the other one, that would change how they spool and if you stick the vanes at one position then it kinda defeats the purpose of having a VVT in the first place.

I like the outside the box thinking, but i think you're WAY outside the box on this one. You're so far from the outside of the box, the box looks like a dot from where you're standing.

 

[Mikey]

I was thinking the vanes would just be stuck to 1 position longer for spool up.
Does anybody have any technical info on exhaust flow rates?

 

[1lowdiesel]

yea but now you're talking about only having 4 cylinders to spool a charger that was normally spooled by 8 cylinders. And even with 8 cylinders to create heat/energy you still have to wait for it to spool.

I would bet that if you got say 2 HE351VE chargers from a Dodge, they would work better than 2 dmax turbo's.

 

[Mikey]

For a stock tune yes, but with double the output from a 600 hp or higher tune might spin them.
Remember the stock turbos were designed for 300 - 400 hp range.
Now maybe 600 - 800 can be made?

 

[LWATSON]

I think your on to something. The stock LBZ vvt's spool fast. I wonder if you could just splice wires together that control the vanes. It would definately spool allot slower, but I think it would work and flow allot. I bet Mark at Danville could probably come close to telling you if it will or will not work. It would be cool to have a pair of Danville vvts under the hood.

 

[Mikey]

Reason for the buzz is because funds are limited, I have 2 LBZ turbos and fabrication availability.
On the intake side, does anybody know if twin turbos could be joined with a y pipe before the intercooler?

 

[TrentNell]

I have a thread in my vendor section on a true twin setup we built and some of the findings, functional systems are possible but it won't be worth your effort using 2 stock vvt chargers.

 

[D-MAX Mafia]

If you wanted to get rid of the stock LBZ turbine housings you could do so by finding 2 stock turbos from a 7.8 inline 6 duramax. They use a t3 style inlet instead of the two port design and are a garrett variable turbo.

The 7.8 uses the same size turbo as a 6.6. I know because I have one.

 

[GeneralTJI]

I've read about stock Toyota Supras having twin vvt's.

No.. they have a sequential twin turbo system. Exhaust is all routed into one turbo until a pre-defined condition (rpm, boost, etc.) and then a valve starts letting exhaust drive up the other turbo. It's quite a setup to make this all happen.. leave it to Toyota to make it work though, clear back in 93 no less!



As far as your idea.... It's interesting. If you had the room, and could locate them with shorter piping, divide off the right 2 cylinders for each scroll of the turbo, had a way to duplicate the vane single to each turbo, played with vane positioning to get it dialed in right... it could make for a setup that flowed in theory up around 1100hp.. and spooled decent. Wonder if you could get it to spool on a stock stall range converter? Wonder how drive pressure would be with only half the exhaust? it would probably still suck once you started to push them..... probably wouldn't be worth it in the end, but cool idea :thumb: