Turbo Lag & superchargers..

[Craig Pugsley]

Hi,

> I wonder if you aimed a little compressed air jet at the impeller (so you
> wouldn't be cooling the turbine side), and just gave a little blast of air
> when the throttle tipped in.

I wondered about this too, like have an air tank in the trunk filled by
a small 12V compressor, and a 1/2 inch air line to the turbo with a
solenoid valve to dump all the tank into the turbo (like pointing a
water hose at a bicycle pedal).

> Even more years ago, there was a deal about variable inlet scrolls.
> Wouldn't that be something -  variable inlet vanes under electronic
> DIY_EFI control?

Err, another innovation from the rotary world- 13B turbos have had 'twin
scroll' exhaust profiles, selected by a vacuum controlled flap since 1986
(or was it 1987??)

Re the electric motor powered supercharger, on RX7 club a 'CVT drive'
was suggested (ie power the supercharger from the crankshaft). I thought
you could use a '2-speed drive' similar to the following:


       A           B            A
       _____________              |\#/|
      /  _______/. .\        |\#/|| # |
     |. O_______. O .|       | # || # |
     | ...      \.../        | # || # |=== To s/c input
     |             /         | # || # |
     |            /          |/#\|| # |
     |           /             #  |/#\|     
     |          /              #    #
     |         /             |\#/||\#/|
     |        /             ]| # || # |
     |       /              ]| # || # |
     | ...  /     a/c clutch]| # || # |=== Idler wheel 
     |.   ./                ]| # || # |
      \___/  C              ]| # || # |
                             |/#\||/#\|  
                      'overspeed'  'Normal'
                        pulley      pulley

The idea is that 'A' has a pawl arrangement for both belts and when the
a/c magnetic clutch is engaged this 'overspeeds' the normal pulley.

(However, I can get a complete 13B turbo engine for less than a 2nd hand
toyota supercharger so I canned this idea).

Cheers,
Craig.