Twincharging
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Twincharging
Hi my honda now currently has a supercharger on it sc14 from toyota to be exact, now.. i bought a new engine and will fully build it i want to add turbo so question is.... Does anyone here build a similar setup? How would the piping be? SC to turbo or turbo to sc? I want to keep the SC btw 😊
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Re: Twincharging
Its been done a few times. You kinda get the best and worst of both worlds. The supercharger gets you improved scavenging, and instant boost off idle, but with the parasitic loss, high rotating inertia, and poor thermal efficiency. Then you still have the heat and packaging complexity of a turbo setup, but youre missing out on the top end power and good efficiency you get with a FMIC because youre cramming the boost through the supercharger. You can make up for that last bit by using a bypass, but even still.
IMO, a properly sized turbo setup accomplishes the same thing, only its better and lighter.
Superchargers are used because people want to be different, not because they are the optimal solution. It sounds like you have already made up your mind about keeping it on there, so you have your answer right there. A twin charged setup will be "different" and that is apparently your goal. So have fun.
To answer your question though, you would want to run the turbo compressor to the supercharger, because the turbo will most likely way outflow the supercharger, unless you use some kind of super tiny turbo. Doing it the other way would make for a really poor performing setup.
IMO, a properly sized turbo setup accomplishes the same thing, only its better and lighter.
Superchargers are used because people want to be different, not because they are the optimal solution. It sounds like you have already made up your mind about keeping it on there, so you have your answer right there. A twin charged setup will be "different" and that is apparently your goal. So have fun.
To answer your question though, you would want to run the turbo compressor to the supercharger, because the turbo will most likely way outflow the supercharger, unless you use some kind of super tiny turbo. Doing it the other way would make for a really poor performing setup.
Thread Starter
Honda-Tech Member
Joined: Mar 2021
Posts: 5
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Re: Twincharging
Its been done a few times. You kinda get the best and worst of both worlds. The supercharger gets you improved scavenging, and instant boost off idle, but with the parasitic loss, high rotating inertia, and poor thermal efficiency. Then you still have the heat and packaging complexity of a turbo setup, but youre missing out on the top end power and good efficiency you get with a FMIC because youre cramming the boost through the supercharger. You can make up for that last bit by using a bypass, but even still.
IMO, a properly sized turbo setup accomplishes the same thing, only its better and lighter.
Superchargers are used because people want to be different, not because they are the optimal solution. It sounds like you have already made up your mind about keeping it on there, so you have your answer right there. A twin charged setup will be "different" and that is apparently your goal. So have fun.
To answer your question though, you would want to run the turbo compressor to the supercharger, because the turbo will most likely way outflow the supercharger, unless you use some kind of super tiny turbo. Doing it the other way would make for a really poor performing setup.
IMO, a properly sized turbo setup accomplishes the same thing, only its better and lighter.
Superchargers are used because people want to be different, not because they are the optimal solution. It sounds like you have already made up your mind about keeping it on there, so you have your answer right there. A twin charged setup will be "different" and that is apparently your goal. So have fun.
To answer your question though, you would want to run the turbo compressor to the supercharger, because the turbo will most likely way outflow the supercharger, unless you use some kind of super tiny turbo. Doing it the other way would make for a really poor performing setup.
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Joined: Dec 2011
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Re: Twincharging
Hey Kai
I've built twin charged and compound charged engines. With a paddle-based positive displacement supercharger like the SC14, you want turbo on top of blower. There is some merits to having the SC feed the turbo on a centrifugal setup. However, since you don't have a centrifugal charger I won't get in to it. It's also slightly different for a lysholm twin-screw style blower.
Really the only thing you need to look at is turbo sizing for the HP you want to make. You need to size the turbo like you would for a larger engine. How large? Take your current engine displacement multiplied by your current pressure ratio. If you have a 1.8L engine and are running 8 psi, that would be 1.8*[(14.7+8)/14.7], or equivalent to a 2.8L engine. Your turbo control strategy is going to be identical to a normal turbo set-up.
I've built twin charged and compound charged engines. With a paddle-based positive displacement supercharger like the SC14, you want turbo on top of blower. There is some merits to having the SC feed the turbo on a centrifugal setup. However, since you don't have a centrifugal charger I won't get in to it. It's also slightly different for a lysholm twin-screw style blower.
Really the only thing you need to look at is turbo sizing for the HP you want to make. You need to size the turbo like you would for a larger engine. How large? Take your current engine displacement multiplied by your current pressure ratio. If you have a 1.8L engine and are running 8 psi, that would be 1.8*[(14.7+8)/14.7], or equivalent to a 2.8L engine. Your turbo control strategy is going to be identical to a normal turbo set-up.
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