Twin Charge!!! (the best of both worlds) - Toyota Yaris Forums

gboezio · 11-09-2008, 09:37 AM

The idea have been discussed and discussed in the BMW community, we assumed that it's more about the "bling" factor, people will always go wow and want to pop the hood to check that insane setup. But in reality, high performance happens at higher RPM, the RPM should never come short of 4000 RPM on a track or road race, leaving the starting line is at WOT and traction is controlled trough the clutch if you ever want to get ahead of the pack, on a road race you just pop two gears and you are boosting within one second.
If someone would build a dyno queen and need help to spool the monster it could do some good and will need a SC bypass valve or the SC would act as a butt plug for the turbo, for this purpose NO2 is usually used to jump start the turbo, as soon as it's generating enough exhaust gases under boost, it will get to peak efficiency pretty easily.
A Yaris is a bad car for running long stretch races, it's nimble and quick around a short track and will benefit from a smaller turbo that will spool fast and make instant boost from 3000 to 6500, this makes more average horsepower going trough the gears than a fat turbo.
Consider the cost and complexity of a compound setup an overkill for speed purposes.
More rotating mass, higher gravity center from the high placed extra weight.
Two compressor, twice the chance of one failing, not to mention that the first one will kill the second then the engine (ok the IC will hold the bigger debris).
Beside that, the Yaris is a very small engine and pulling horsepower from the crank is worth a thread by itself, using power that have been produced trough the small pistons, rods, crank to spin a SC, while the turbo is there and getting the free exhaust energy is a big no-no to me, I feel that these economically engineered parts are the weak link more than the induction capacity, I'd rather want to have this power available to the wheels.
If one is not afraid of complexity, a SC clutch system could be done to desactivate the SC when the turbo is spooled up, along with the SC bypass valve...and it's not gonna win the race

Why not putting that money on the suspension, tires, brakes where it will definitely gain overall performance.
My two cents

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11-09-2008, 09:37 AM	#35
gboezio Drives: Yaris 4dr 2008 Join Date: Nov 2008 Location: victoriaville,Qc,Canada Posts: 28	The idea have been discussed and discussed in the BMW community, we assumed that it's more about the "bling" factor, people will always go wow and want to pop the hood to check that insane setup. But in reality, high performance happens at higher RPM, the RPM should never come short of 4000 RPM on a track or road race, leaving the starting line is at WOT and traction is controlled trough the clutch if you ever want to get ahead of the pack, on a road race you just pop two gears and you are boosting within one second. If someone would build a dyno queen and need help to spool the monster it could do some good and will need a SC bypass valve or the SC would act as a butt plug for the turbo, for this purpose NO2 is usually used to jump start the turbo, as soon as it's generating enough exhaust gases under boost, it will get to peak efficiency pretty easily. A Yaris is a bad car for running long stretch races, it's nimble and quick around a short track and will benefit from a smaller turbo that will spool fast and make instant boost from 3000 to 6500, this makes more average horsepower going trough the gears than a fat turbo. Consider the cost and complexity of a compound setup an overkill for speed purposes. More rotating mass, higher gravity center from the high placed extra weight. Two compressor, twice the chance of one failing, not to mention that the first one will kill the second then the engine (ok the IC will hold the bigger debris). Beside that, the Yaris is a very small engine and pulling horsepower from the crank is worth a thread by itself, using power that have been produced trough the small pistons, rods, crank to spin a SC, while the turbo is there and getting the free exhaust energy is a big no-no to me, I feel that these economically engineered parts are the weak link more than the induction capacity, I'd rather want to have this power available to the wheels. If one is not afraid of complexity, a SC clutch system could be done to desactivate the SC when the turbo is spooled up, along with the SC bypass valve...and it's not gonna win the race Why not putting that money on the suspension, tires, brakes where it will definitely gain overall performance. My two cents