by Hellbound on Mon, 10 Oct 2011 7:18 +0000
Heres about as much as i know about these types of chips, more than happy to be corrected here as we can all learn something...
VMN only adjusts is the timing and duration of the injector cycles, no pressure adjustments to the actual fuel rail as it isnt what this type of chip is designed to do. Chip-It on the other hand adjusts both the injector timing /duration and increase the rail pressure for even more power, as timing adjustments only can only increase power within a certain range before more rail pressure is needed. This is where some other cheaper chips have problems because they ONLY raise fuel rail pressure, and as the fuel rail sensor is very sensitive to changes it can throw the car into limp mode, thats why these are the inferior types of chips to get as fas as i can see.
As with all engines since the dawn of time the more fuel you can fit into the combustion chamber - matched to the correct amount of air then you are going to make more power during the power stroke, limited by the physical size of the combustion chamber. So in a way altering the timing and duration means you are holding each injector open for longer at the correct time of the stroke and thus putting more fuel in, so along with a correct amount of air you are going to get more power than standard.
Maybe someone on here knows more about the difference between just pumping more fuel in during normal injector cycles at an increased set rate across the rev range, or altering the opening duration of the injector only during a tweaked timing sequence without raising the pressure. Cos i for one dont know the answer to that but both methods achieve the same effect but do it in different ways. What way is the safest who knows but limp mode is a scary thing to experience when your trying to overtake a road train at 120km...
Last edited by
Hellbound on Mon, 10 Oct 2011 7:22 +0000, edited 1 time in total.
60% of the time, it works every time