These are asked about daily so please read before asking if they are any good.
Ebay modifications - chips and electric superchargers.
Due to many people ripping people off on ebay selling these modifications i felt i should write up about them.
Firstly the ebay chip.
It will not give the claimed bhp by the companies, tuning is not that simple you dont just get 25bhp from adding a £10 ebay chip. The ebay chips are simply a resistor in a flash box, all this does to the ecu is make it think there is more air comming into the inlet than there actually is, so fueling is increased, this overfueling will just cause bad MPG and engine wear which will lead to you eventually killing your engine.
A chipped ECU (superchips)
In some cases with some engines they can work quite well, however they really are not the best you can get, if you are putting a set of cams into your engine with some headwork for example you need to have the ecu MAPPED, this mapping should be done on a rolling road by a specialist. They will plug your ecu into a laptop/computer and reprograme the ecu so that it works the best with all of the modifications you have done to it. A Chip does not do this, a chip has a base map which will not be programmed to get the best out of the modifications you have done in your car. A mapping session can be done on a standard ecu although if you plan to go wild with the engine and fit throttle bodies/supercharger/turbocharger an aftermarket/standalone ecu is something you need to look into.
Electric supercharger
This one seems to be popping up alot recently, a proper supercharger conversion will cost several thousand pouds and is driven off of the engine to give good power, a belt is connected via a set of pulleys to the charger that effectively compresses the air going into the inlet manifold giving it more pressure and then more power.
The electric supercharger is basically a very poor imitation of this, its using a tiny fan rather than like that in your PC, now stick your head out of a window and feel the pressure when you are driving, this is the speed at which the air is going into your inlet, the fan WILL NOT be able to increase the velocity of this air as its just a tiny little electric fan, it will probably get more speed from the air passing through it than it gets from its own driven motor.
Basically tuning isnt cheap, if you want big bhp you need to spend big £££, if you find something on ebay thats claiming big bhp gains for pennys its usually not going to happen.
please note this is just a rough guide.
Ebay modifications - chips and electric superchargers.
Due to many people ripping people off on ebay selling these modifications i felt i should write up about them.
Firstly the ebay chip.
It will not give the claimed bhp by the companies, tuning is not that simple you dont just get 25bhp from adding a £10 ebay chip. The ebay chips are simply a resistor in a flash box, all this does to the ecu is make it think there is more air comming into the inlet than there actually is, so fueling is increased, this overfueling will just cause bad MPG and engine wear which will lead to you eventually killing your engine.
A chipped ECU (superchips)
In some cases with some engines they can work quite well, however they really are not the best you can get, if you are putting a set of cams into your engine with some headwork for example you need to have the ecu MAPPED, this mapping should be done on a rolling road by a specialist. They will plug your ecu into a laptop/computer and reprograme the ecu so that it works the best with all of the modifications you have done to it. A Chip does not do this, a chip has a base map which will not be programmed to get the best out of the modifications you have done in your car. A mapping session can be done on a standard ecu although if you plan to go wild with the engine and fit throttle bodies/supercharger/turbocharger an aftermarket/standalone ecu is something you need to look into.
Electric supercharger
This one seems to be popping up alot recently, a proper supercharger conversion will cost several thousand pouds and is driven off of the engine to give good power, a belt is connected via a set of pulleys to the charger that effectively compresses the air going into the inlet manifold giving it more pressure and then more power.
The electric supercharger is basically a very poor imitation of this, its using a tiny fan rather than like that in your PC, now stick your head out of a window and feel the pressure when you are driving, this is the speed at which the air is going into your inlet, the fan WILL NOT be able to increase the velocity of this air as its just a tiny little electric fan, it will probably get more speed from the air passing through it than it gets from its own driven motor.
Basically tuning isnt cheap, if you want big bhp you need to spend big £££, if you find something on ebay thats claiming big bhp gains for pennys its usually not going to happen.
please note this is just a rough guide.
hopefully we should get less 'electric supercharger' threads popping up 
