Compound turbo with electric supercharger?
#21
A couple years back Audi invited me to drive a prototype A6 TDI that was equipped with an electrically-driven centrifugal compressor.
In this car the s/c was added in series with the turbo, just downstream of the intercooler. It wasn't sized to handle the max airflow requirements of the engine, just to fill in way down low in the rev range and during transients, switching off once the turbo was huffing in earnest. Because this was a diesel, the electric s/c wasn't just a performance adder, it was also an emissions helper.
It worked great. The engine had heaps of torque right off idle and pulled like a freight train.
The downside? The electric supercharger used a dedicated 42 volt bus to keep the current draw to a reasonable level. Cost on top of cost.
You see a similar situation with the electrically assisted turbo stuff. Realistically they all need a high voltage bus, making them suitable for use only use on hybrid vehicles. And hybrids are inherently costly, what with having two powertrains on board already, so adding zoomy turbo electrons is a hard sell.
In this car the s/c was added in series with the turbo, just downstream of the intercooler. It wasn't sized to handle the max airflow requirements of the engine, just to fill in way down low in the rev range and during transients, switching off once the turbo was huffing in earnest. Because this was a diesel, the electric s/c wasn't just a performance adder, it was also an emissions helper.
It worked great. The engine had heaps of torque right off idle and pulled like a freight train.
The downside? The electric supercharger used a dedicated 42 volt bus to keep the current draw to a reasonable level. Cost on top of cost.
You see a similar situation with the electrically assisted turbo stuff. Realistically they all need a high voltage bus, making them suitable for use only use on hybrid vehicles. And hybrids are inherently costly, what with having two powertrains on board already, so adding zoomy turbo electrons is a hard sell.
#22
I recall a compound set up has the smaller turbo compressor inlet connected to the compressor outlet of the larger turbo? So, for a compound set up with this Phantom turbo, would you set it up as follows?
1. Outlet of turbo compressor feeds the intake of phantom turbo.
2. Outlet of phantom turbo to hot side of intercooler.
3. Bypass valve between between turbo outlet and phantom turbo (which opens at optimal pressure ratio of the phantom turbo) and bypasses the Phantom turbo completely. Whenever bypassed or not called on for boost, the Phantom motor is turned off and it's battery is recharging.
4. Tune
5. Very little turbo lag?
1. Outlet of turbo compressor feeds the intake of phantom turbo.
2. Outlet of phantom turbo to hot side of intercooler.
3. Bypass valve between between turbo outlet and phantom turbo (which opens at optimal pressure ratio of the phantom turbo) and bypasses the Phantom turbo completely. Whenever bypassed or not called on for boost, the Phantom motor is turned off and it's battery is recharging.
4. Tune
5. Very little turbo lag?
#27
I did this with my car
Has anyone thought of adding this electric centri supercharger to a big turbo setup to help low end and spoolup?
Openflash Electric Supercharger (Dyno & Pics) - MX-5 Miata Forum
Openflash Electric Supercharger (Dyno & Pics) - MX-5 Miata Forum
In this image the green line was on 91oct and the red on e85.
In this image the blue line was with stock front pipe. And the green line with catless aftermarket front pipe.
Last edited by Bloody_Booger; 09-03-2020 at 01:50 AM.
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