Electrical Supercharger / Turbo Anti-lag

[Jens Stobernack]

Geoff Watts wrote:

> How about an electronic anti-lag?
>
> Compressor, get about 15psi happening, and a little tank, big
> solenoid, release it into the exhaust manifold.  Would that work?
>
> How does the anti-lag work on the Mitsubishi EVO4's?
>
> geoff
>
> -----Original Message-----
> From:   avos at cochlear.com.au [SMTP:avos at cochlear.com.au]
> Sent:   Friday, May 09, 1997 7:11 PM
> To:     diy_efi at coulomb.eng.ohio-state.edu
> Subject:        Re: Electrical Supercharger
>
>      In the interest of efficiency though, the turbo is still the way
> to go
>      since kinetic/thermal energy in the exhaust is essentially free
>      anyway. Perhaps the problem of lag in turbos may be solved by
>      producing a turbo that has an electrical propulsion when not
> enough
>      exhaust gases are being produced. This would be efficient, as at
> low
>      revs the engine does not consume as much gas, so the electrical
>      propulsion could be relatively low power, but at higher revs when
>
>      higher intake flows are required, the exhaust propulsion will be
> up to
>      the task.


I've seen two types of Anti-Lag methods.

The first is to inject a small amount of gas into the exhaust gas before
the turbo. The gas ignites and keeps the turbo wound up. If you've ever
watched the Canadian Rally Championship you will see a Ford Cosworth
with this setup. When the car passes you, you will hear chirping, like a
bird, this is the ignition of the gas in the exhaust.

The second was used in the American supercar the "Vector", I think. The
manufacturer mounted an electric motor on the turbo and kept the turbo
spinning below a certain motor rpm. I'm not sure if they still use the
setup and I cann't remember the current requirements.

Hope this helps you out,
Jens