Island Flow definition
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Island Flow definition
Island Flow—This is the flow rate at which the supercharger is most efficient. Note: This flow rate is not the peak flow of the supercharger. Typically, smaller superchargers have lower Island Flow, meaning that they perform most efficiently at lower flow rates. While high Island Flow is commonly a characteristic of larger superchargers, and ideal supercharger would have high Island Flow (be efficient at high flow rates) and have a small physical size (making it more efficient at low speeds and low-flow delivery rates).
thats what I got anyhow, any other inputs?
thats what I got anyhow, any other inputs?
Last edited by moregrip; 12-11-2005 at 11:56 PM.
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Originally Posted by moregrip
Island Flow—This is the flow rate at which the supercharger is most efficient. Note: This flow rate is not the peak flow of the supercharger. Typically, smaller superchargers have lower Island Flow, meaning that they perform most efficiently at lower flow rates. While high Island Flow is commonly a characteristic of larger superchargers, and ideal supercharger would have high Island Flow (be efficient at high flow rates) and have a small physical size (making it more efficient at low speeds and low-flow delivery rates).
thats what I got anyhow, any other inputs?
thats what I got anyhow, any other inputs?
Right on. The only turbochargers that are close to ideal are the VGT (variable geometry turbochargers) turbos. These act as you describe (high island efficiency at high flow and efficient at low flow as well). They can be programmed to perform like a small or large turbo. Though most work in the lower rpm ranges of diesels, workable versions for performance applications should be available in the near future. Chevy and Ford diesels both use these and Gale Banks has introduced an aftermarket one (VGT turbo and electronic controler) for the new cummins that does not.
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Aerocharger had VATN turbos years ago. The kicked ***, but they were tiny. They were even self contained too. I've looked ALL OVER for various comp. maps on them. It would be very interesting to see a VATN or VGT turbo vs. a similar regular turbo or SC. I bet its one big island!
#6
Originally Posted by vanillagorilla
Aerocharger had VATN turbos years ago. The kicked ***, but they were tiny. They were even self contained too. I've looked ALL OVER for various comp. maps on them. It would be very interesting to see a VATN or VGT turbo vs. a similar regular turbo or SC. I bet its one big island!
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Originally Posted by natural1
Right on. The only turbochargers that are close to ideal are the VGT (variable geometry turbochargers) turbos. These act as you describe (high island efficiency at high flow and efficient at low flow as well). They can be programmed to perform like a small or large turbo. Though most work in the lower rpm ranges of diesels, workable versions for performance applications should be available in the near future. Chevy and Ford diesels both use these and Gale Banks has introduced an aftermarket one (VGT turbo and electronic controler) for the new cummins that does not.
one thing I have read about vgt at higher temperatures is that the fins get "slow" and dont move as fast.
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I would probably say the tuning issues, if any, of an aftermarket vgt turbo might overwhelm most people. Oh yeah, and let us not forget about the price of an electronically controlled vgt. I seriously doubt these come cheap. I cannot even find a price for the 03-06 cummins version on Banks' site. I think the "user friendliness" of your average turbo is about all most people are intrested in at this point. That is unless you own a diesel without one or a low cube high rpm vehicle like an indy car. Great idea but a little too much quid for the small benefit in my application. IMO.
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most blowers and turbo's have a compressor map to read. getting out of a blowers efficiency range is very common and will lead to big numbers on a dyno, but not so for track use. throwing around hot air just doesn't get the job done.
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Originally Posted by zippy
most blowers and turbo's have a compressor map to read. getting out of a blowers efficiency range is very common and will lead to big numbers on a dyno, but not so for track use. throwing around hot air just doesn't get the job done.
This was from the "single or twin turbo" post on 12-10-05. All I can say is word.