Video of 3 rotor, 3 turbo P-Port.
There's a bunch of vids of the 3-rotor apparently in its earlier form (looks like it had a huge single before) on the company's website:
www.cityperformancecentre.com
Figures it'd be Aussies doin' crazy sh*t like that...
www.cityperformancecentre.com
Figures it'd be Aussies doin' crazy sh*t like that...
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Originally Posted by soloracer951
Very trick motor but what is the advantage of doing a three turbo set up? Seems like a lot of complexity for very little difference from going with a properly sized single. Anyone?
Using 3 turbos as opposed to 1 large one will actually allow better flow through the exhaust. Each turbine wheel takes less effort to turn in relation to 1 large heavy one. While it would seem that the fact there are 3 would cancel out any benefit of one larger heavier one, it doesn't work that way. There is still an advantage to the 3 smaller ones. The goes for flow as well. Basically you can still have faster spool and less exhaust backpressure with 3 small turbos vs 1 large one. Sounds a little strange but true. The more overlap you have on an engine, the more and more this becomes critical. You want to keep exhaust backpressure as low as you can. The higher it is, the more intake dilution you will get during overlap which means hotter air and less oxygen. You'd actually find that you can make more ultimate power with less boost by using smaller turbos with such large overlap engines.
This was seen on my friend's (TURBOSTREETFIGHTER who no longer comes around here) old bridgeport 13B engine. He ran one large turbo and had a hard time going over 22 psi of boost. He just wasn't getting much more power above that point. If he went to a larger exhaust housing he could spool it up fast enough and a smaller one cost him power. He went to 2 smaller hydrib t3/t4 units and picked up alot of power. They spooled faster and made more power. He made more power with them at 19 psi than he did the single at 22 psi. He took it up to 26 psi before an injector failure killed the engine. Mazda also figured this out in the late 80's with their race engines. They found using 2 smaller turbos vs 1 larger one resulted in faster spool rates and less backpressure. On their turbo bridgeport engines they'd use a turbo per rotor. Even Racing Beat adopted this for the same reason with their Bonneville cars. The more port overlap you have, the more critical it is.
This was seen on my friend's (TURBOSTREETFIGHTER who no longer comes around here) old bridgeport 13B engine. He ran one large turbo and had a hard time going over 22 psi of boost. He just wasn't getting much more power above that point. If he went to a larger exhaust housing he could spool it up fast enough and a smaller one cost him power. He went to 2 smaller hydrib t3/t4 units and picked up alot of power. They spooled faster and made more power. He made more power with them at 19 psi than he did the single at 22 psi. He took it up to 26 psi before an injector failure killed the engine. Mazda also figured this out in the late 80's with their race engines. They found using 2 smaller turbos vs 1 larger one resulted in faster spool rates and less backpressure. On their turbo bridgeport engines they'd use a turbo per rotor. Even Racing Beat adopted this for the same reason with their Bonneville cars. The more port overlap you have, the more critical it is.
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