I don't have the slightest doubt that it works because I've already tasted it on the little VW.
The initial spool is electric (no doubt about this too) and then there's a progressive catch from the mechanical part. Very nice.
So, I want to do it to the Uno. First thing I'd like to know from you savvy guys is what kind of metering does the ECU rely on? MAP sensor?
And... as a side note, I was just watching the new 2 cylinder FIAT engine in the Geneva motor show that'll feature not less than 85HPSame approach.
As already stated, the 'electric superchargers' you see on Ebay do not work. Louie has already explained the amount of air volume that is needed to increase induction pressure to be of any benefit for engine power/ effciency. A kit you can buy off Ebay will not be able to do that. If you have proof otherwise of an aftermarket electric supercharger, with substantiated and proven test results, then please feel free to post up links. As of yet, there has been no proven aftermarket electrical supercharger system that can be retro-fitted to a vehicle and give it any benefits.
The VW system you mention is a hybrid combining turbocharging AND an 'electric'/ mechanical supercharger and is also a non permanent system that is switched on via ECU only when demand is required. Are you converting your engine to be turbocharged as well as this 'electric' super charger? Where are you going to get this electro mechanical hybrid system from? What turbo are you going to be fitting and where are you getting it from? What engine management system are you going to be using as you are going to need a lot of sensors to monitor the engine and to control the additional components?
This sounds to me to be a complex and expensive system that will give little practical or affordable gains on an old car like the Uno. It appears to be technology that is only just coming on to the market with production vehicles, and it is hybrid technology utilising turbocharging and supercharging rather than a fully electric supercharger on its own.
You need to give full details of what parts you intend to fit, how you are going to integrate them onto your Uno's engine and where you are going to source these parts (plus their estimated costs). You also need to explain how you are planning to control these with a customised and mappable aftermarket engine management system and what ECU system you are going to use. At the moment it sounds to be an impractical, uneconomical (financially) and implausible proposal that cannot be achieved without substantial costs and work involved.
Also, as has already been mentioned, the Uno SPi system is a very basic mono-point injection system that acts more like an electrically metered carburettor rather than a full multi-point injection and ignition system. As far as I'm aware it doesn't even have a MAP sensor nor AFM units. As a consequence, to get the best out of a system like as used on the VW you would also need to look at changing the entire Uno SPi system to one that is more mappable and controllable.
Some further details of the VW and 'electric' VTES system can be found in these links:
http://www.gizmag.com/electric-supercharger-promises-instant-power-boost/9364/
http://www.treehugger.com/files/2009/09/electric-supercharger-hybrid-boosts-torque-better-mpg.php
http://www.greencar.com/articles/electric-superchargers-boost-high-power-small-engines.php
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