Holset M2 Two-stage with RTC

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@adamb8418 9 жыл бұрын

Simply put, it's not at all a compound setup yet two different sized turbos controlled by wastegates or diverter valves depending on engine load. Normal driving uses the smaller turbo, high rpm utilizes the larger and for maximum load both contribute but the smaller never at any point feeds the larger (compound style). Correct?

@crazyhass84 7 жыл бұрын

Kind of... If the small compressor didn't feed the larger one then where does it get the air from? there is only ONE intake. Like you said this cummins setup has two separate compressors and two turbines. aka two turbos. The valve on the intake and exhaust is to determine if the flow goes to both turbos or just one. If you look at the 2.53 and 3.45 marks you can see the side profile of the compressor housings. If the intake valve is closed the larger feeds the small. If the valve is open they both get fed but since the path of least resistance is now the intake the flow "skips" the high pressure compressor. There is only 1 intake valve so its either open or closed... yet there are 3 conditions... low pressure turbo, high pressure, or both. one of those modes happens with physics and natural air flow.

@xXBurntBaconXx 9 жыл бұрын

So here is what I'm getting from this, it has 3 turbines, 1 exhaust, 1 high pressure compressor, and 1 low pressure compressor. It just uses a valve to switch which compressor turbine it goes to right?

@theq4602 8 жыл бұрын

Its two turbos connected . A small one for acceleration and a larger vgt for boost at low rpm.The big turbo's compressor wheel leads to the small turbos compressor wheel. The exhaust flows through the small turbo then to the large turbo. Although there is additional valv and piepes for different modes. Ford's 6.4liter power strokes have a similar setup but with no bypass valves. (Im a ford guy here to learn bout what he's up against) But other than that both setups give your truck a seat of pant acceleration. P.S don't ever buy a 6.4 powerstoke (2008-2010 fords) if its a "good deal" something is bad wrong. Not because of systems like this which work amazingly, but because 6.4s have many problems that are expensive and are caused by the dpf.

@crazyhass84 7 жыл бұрын

not really. this isn't like the ford. the ford 6.7l had 1 turbo. it had 2 compressor wheels on one shaft. both driven by the same turbine. That design sucked at high altitude because it had no variability. Then now went back to a conventional VGT. This cummins setup has two separate compressors and two turbines. aka two turbos. The valve on the intake and exhaust is to determine if the flow goes to both turbos or just one.