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As far as I know, the twin turbo legacy is a sequential system, meaning all four cylinders drive each turbo, at different parts of the rev/load map.
Ultimately this is the ideal setup, with limited lag from the smaller turbo but still having the top end power of a larger turbo.
1200RC's setup isn't sequential. It uses 2 cyl to fire one turbo and the other 2 cyl to fire the other turbo.
1200rc your newer design of cyl's 1 and 4 firing turbo 1 and cyl's 3 and 2 firing turbo 2 is better than the previous setup of cyl's 1 and 2 firing turbo 1 and cyl's 3 and 4 firing turbo 2. As the newer design evenly pulses the turbos throughout the engines cycle.
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it's true what it says, i remember my bro's starion (a little old skool but still) it would make positive boost at 80km/h in second gear, this meant he never really used boost, cause when it arrived he was already on the speed limit, basically in the every day driving around suburban roads it was pointless, the only time he could really use it was down the occasional freeway on ramp
You can't compare these to setups.
If you were to swap your 2 turbos for 1 turbo that had the same flow rates as the 2 turbos put together you would still get the same driving charactoristics from the single turbo as you did with the 2 turbos.
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The argument does not apply to 4cyl cars. A turbo works by the turbine being driven by exhaust gasses - obviously enough. But when you halve the number of cylinders feeding each turbo, you not only halve the total flow over the turbine, you have also made it operate on the turbine for half the time. Not big problem if you started with a 6cyl, but not so good if it was a 4cyl. Ever heard a V twin bike running? Nice way to drive a gas turbine huh?
L18 I cant see how it doesnt apply to 4 cyl's.
Yes as you say obviously a turbos turbine is driven off exhaust gases but when sized correctly 6, 4, 3 or 2 cyl's plays no part.
I understand what you are sayin with the V twin bike engine but this cant compare to a turbo. On an engine the firing position is fixed ie; V twin #1 cyl fires at 0 degrees and #2 cyl fires at 180 degrees. So obviously if you ad more firing positions evenly the engine will rotate smoother.
On a turbo there is no fixed exhaust pulsing position as the turbine is driven by gas flow.
On an engine the exhaust gas flow for each cylinder pulse is varied through out different opperating conditions. So really 3 cyl's or 2 cyl's doesnt come into play.
At the ended of the day it comes down to the turbos sizing for flow rates through the turbine housing.
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You've fallen for the age old "if some is good, more must be better" trap...
As for that statement yeah I too belive thats true of 1200rc but L18 I think you yourself with your statements of there being no factory 4 cyl's with twin turbo setups means you have fallen into the way of thinking " Ive never seen anyone do it, so it must be impossible"
Thats Just My Thoughts On The Subject.
feel free to correct me if you think otherwise.
Cheers Steve
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migth have a little bit of lag but will go pretty well on a 1200cc engine. LOL if your really game try two with 30psi. The stock bottom end should handle it you may need to run premium unleaded.
