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Old 06-09-2014, 08:28 PM   #21
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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.
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Old 06-17-2014, 08:41 PM   #22
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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?
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Old 06-17-2014, 08:44 PM   #23
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You'd want them in parallel. But even still. We have near zero turbo lag options for the BP up to 500hp. Why would you want more than that?
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Old 06-17-2014, 08:56 PM   #24
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My EVOIII 16G, small as it is, still does not really get going until ~4000 rpms. Sure, it could be overkill. But, just thinking, that's all. It would be easier to set up with no need to plumb up another hot side.

Why would parallel be preferred over compound?
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Old 06-17-2014, 08:59 PM   #25
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You're not going to have the electric on all the time.

Your evo 3 16g isnt even ball bearing. Install EFR, remember that nothing belower 3000rpms really matters for going fast, profit.
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Old 06-17-2014, 09:06 PM   #26
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EFR would be too easy, lol.
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