How much would the VGTT's benefit from a sequential turbo setup.
Some people will say it cant be done, but i disagree. I think it could be done relatively easy, ecspecially with completely divided intake tracks.Sound performance is in the process of creating an aftermarket sequential setup for the 2jz supra's and i think this could be even more benificial to the Z's. The design is actually quite simple.
1. The hard part is making a conection between the two cylinder banks. (obviously)
idea:
devise a 3/4-1" spacer that would be placed inbetween the exhaust manifold and the turbo exhaust inlet flange, extend the manifold studs to accomidate. This new "flange" would have an opening on the back side to allow exhaust pressure to "vent" into a cross over pipe that would run behind the engine and connect the two exhaust manifolds, equalizing back pressure from side to side.
2. The exhaust "brake"
Stopping the exhuast from flowing through one of the turbos. (probebly passenger side)
Idea:
This is where i "borrow" a design from the sound performance setup, its a simple round plate that is mounted in the down pipe that will restrict/ stop the exhaust flow enough to force it through the driver side turbo, essentially making the entire engine spool one turbo before the other. This restrictor will be hooked to a control mechanism that will open and allow the exhaust to flow through and spool the passenger side turbo at a given boost pressure. 3. The intake air restrictor.
The intake tracks have to join to give the engine equal boost pressure to both throttle bodies, but the idle turbo must be shut off to prevent the working turbo from recurculating its own boost pressure through the idle turbo and back into the intake.
Idea:
Another theft from the sound performance setup, they plan to use a reed valve of sorts to stop the boost pressure from leaking out the idle turbo. Another simple way to create this part would be to use a stock throttle body again hooked to a boost actuator. If this actuator was to be set at a slighly higher boost pressure it may even alow it to "pre-spool" the passenger side turbo alittle bit to minimize mid rpm lag, as the passneger side intake track would already be to pressure before the valve opend. Basicly if im on the right track, the VG could be equiped with much larger turbo's with out the lag of larger turbo's being they're spooling one at a time.
I "think" with a setup like this the GT28RS turbos could be considered "small". Because untill a given boost pressure you'd use one turbo to create low rpm boost and mid range power, and above that boost pressure you'd have a second turbo to create the flow, and keep the boost pressure in the higher rpms. Just some late night pondering. Where would the problems be? Would the system be "worth while"?
 "Why is it every time somebody wastes a ton of time and money reinventing the wheel, poorly, the critics are "haters?"- Kenny 09:29:05 08/15/06 AIM: Onebadz32
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