21-04-2015, 07:47 PM
The reason you gain power from them is because of how they work... I need to do a guide video on the differences between IDI injectors and DI injectors...
IDI injectors near enough cause no restriction - especially when combined with a VE pump, you're not limited by how much the nozzle will flow, rather the ramp rate of the camplate inside the pump - remember that a VE pump can only increase injection duration it cannot and will not affect how much fuel it puts in over a given amount of time, that is a constant - you only build the line pressure up to the break point and that's it...
DI on the other hand has a cover over the nozzle and you end up building more line pressure due to the more aggressive ramp rate on the camplate, so you can turn up the pump as much as you like, but all that will happen is you extend the injection duration past the injection window of it actually able to burn the fuel properly and just end up with it burning as it goes out the exhaust valve... OR you end up with high line pressure as always, but the profile of the camplate ends up dropping before you managed to finish the injection that you wanted, due to the small nozzles, hence when you bang on a big set of nozzles, even with NO adjustments to the fuel pump, they can deliver more fuel in less time and the line pressure drops - now you've got less pressure, so worse atomisation of the fuel entering... So yes, more power, but probably a drop in economy and a bit more soot.
IDI injectors near enough cause no restriction - especially when combined with a VE pump, you're not limited by how much the nozzle will flow, rather the ramp rate of the camplate inside the pump - remember that a VE pump can only increase injection duration it cannot and will not affect how much fuel it puts in over a given amount of time, that is a constant - you only build the line pressure up to the break point and that's it...
DI on the other hand has a cover over the nozzle and you end up building more line pressure due to the more aggressive ramp rate on the camplate, so you can turn up the pump as much as you like, but all that will happen is you extend the injection duration past the injection window of it actually able to burn the fuel properly and just end up with it burning as it goes out the exhaust valve... OR you end up with high line pressure as always, but the profile of the camplate ends up dropping before you managed to finish the injection that you wanted, due to the small nozzles, hence when you bang on a big set of nozzles, even with NO adjustments to the fuel pump, they can deliver more fuel in less time and the line pressure drops - now you've got less pressure, so worse atomisation of the fuel entering... So yes, more power, but probably a drop in economy and a bit more soot.
