Originally Posted by
Stavros
Will-
Cutting it out is a shit idea IMO, and should run the turbo thru the charger, as long as the chargers a posi displacment one. Pointless with centrifugal one.
Mike- Its not the size thing thats the issue there (tho thats tiny), its the fact you used a type of supercharger thats TOTALLY pointless for a twincharged application
Why use a charger that only gives maximum boost at maximum rpm for something to give you more low down power?
You need a positive displacment charger to make any twincharged setup work.
Ideally you would want to keep it in, but you run into some major problems of compressor overspeed, and basically having a negative pressure behind it, the supercharger will always be the restricion. Somthing like a down geared roots blower would be ideal, to give lots of boost at low engine RPM, but you would have to slow it down somehow or disconnect it via a clutch ( like an aircon clutch), as the vanes would just explode at 8000 RPM (engine speed) and would possibly cause a big restriction meaning the turbo could notget enough air in.
Way I would do it is run the charger into the turbo inlet, but have a Y pipe with a non-return valve and a auxilley air feed, so as the charger runs out of puff, the NRV would open and allow extra air to be drawn into the turbo, with an RPM switch to disengage the charger at say 4000Rpm.
. Space is the big problem, as is finding an electro-magnetic clutch man enough to hold a supercharger.
Any idea how much power a eaton blower off a mini cooper would take to drive at max airflow? I am told it would take about 20-30hp which is a hell of a lot for an aircon clutch to hold onto.