Quote:
Originally Posted by adsayer
Sorry to pull this up John, but I'm rather interested in the the effect of increasing the fuel pressure in terms of increasing efficiency - as I'm guessing there would be better atomisation with increasing exit velocity (through an increase in fuel pressure). My worry is that it will run rich in open loop conditions (idle is my biggest concern for MOT emission regs). You mention 'will usually give you another 12-15%', is that power I'm assuming?
I've got standard injectors, and the usual intake and and exhaust modifications so I know that increasing the fuel pressure would be overkill in my case if I'm pursuing hp although I'm not thinking of it increasing it to even 4 bar - is it viable or am I barking up the wrong tree?
Cheers,
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a std ecu is in closed loop control at most times except for certain conditions decided by the ecu designer ,
std vts ecu is in closed loop at everything but fullthrottle up to around 4k ,after that it is open loop from around 70% --these are not exact figures -but your worry about raising fuel pressure and mot is unfounded ,the std ecu is adpative and will correct quite happily when using a 4.5 bar reg ,but yes it will make it richer on WOT.
I,m not sure what you are trying to achieve ,but if by effiency you mean economy ,then there is a lot more to it than making car run lean .
a stand alone ecu with full w/band will allow yopu to decide where it is controlled and allow you to decide at what lambda level you run at at any given throttle /load setting .
economy + emission are not the same lambda level for cruise --
too deep a subject for a full reply
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