It's not the wastegates that make it spool faster, its the twin separate systems that splits the cylinders. The only way to do that is to have 2 complete wastegate systems. Once it gets from the discharge of the wastegate and the turbocharger turbine it doesn't matter anymore.
Unless your divider in the wategate feed goes all the way to the valve on the single wastegate setup. I was looking at your dyno plots and was aghast at how early you spool and what you make top end. Before I disappeared for a while it was my goal to get the earliest spool I could at hp, and I tried a lot of systems, including ryan's mapping of the vvti system, and always a cast manifold as it made so much difference to throttle response and spool, but nothing comes close to touching your system, it's quite something.
I had a tubular manifold from boost logic, and it just turned to putty eventually, mind you, so did their 4" stainless exhaust. Agree with most of what is being said here, from a technical stand point that is regarding twin scroll and dual wastegates etc, this advantage is more noticeable on larger turbos, but if you run a smaller setup in the region of hp I very much doubt you see any real world gains, in fact if you are not careful with the newer turbos now available you may increase the chance of surge.
If I was looking for big power then Jamies setup is ideal, for hp a much smaller single scroll turbo on a cast manifold would be my choice, not only for cost but also for simplicity. The problem with current cast manifolds for the 2JZ is they are all the log design. This is okay for quick spool, but otherwise the design is flawed, as they're restrictive and encourage high EGTs.
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Restore formatting. Only 75 emoji are allowed. Display as a link instead. Clear editor. Upload or insert images from URL. We have placed cookies on your device to help make this website better. Left, Right, Left, Right Even though it may seem like it, we are not looking for a wastegate to flow At least no where near the amount that the header tubes and turbo housing are.
Therefor, if the wastegate is not flowing the same amount, it is going to create a pressure barrier in the manifold, at the point where it joins. This is barely going to interrupt exhaust charge if it is done right. Infact, I have even seen the cars they use in Indy running an entire manifold bank to the wastegate alone. Either way, I guess the conclusion that is in my mind is that joining the two sides together is not really going to disrupt anything. I was always under the impression that 2 wg's are only necessairy on a large frame turbo regardless of wether or not its a twin scroll if you're trying to run low boost levels.
There are plenty of people on the supra forum that run a single mm wg on a r that try to run psi and they just cant do it. How will you controll boost on the side that will allow exhaust gas to still pass over the turbine wheel and continue to spin it? Unless your wastegate is on the turbine housing itself or on the downpipe you might boostcreep. I do agree with the statement about bigger turbos needing smaller wastegates though. You must log in or register to reply here.
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The only way a single WG would work on a split-scroll turbo is if you could somehow keep each secondary's exhaust completely separate from the other's right at the WG flange. The reason now is I scored a hx40 with a ar84 turbine for very cheap.
About 14cm2 And the housing is not internally wastegated. I thought about tieing both the tubes together, but that would then be pointless having a twin scroll. Venting off 2 cyls may work, but I feel unsure about it. I think I'll put two wastegates in. Thank you for all the responses. That is impossible I think. Should translate to 14cm2.
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