Increasing Fuel Pressure to Increase Injector Flow
After coming to realise the cost of an aftermarket ECU and larger injectors, Ive decided that I'll utilise what I've got (with a turbo set up) for the moment. I'm considering using the Vortech Super FMU (adjustable rising rate regulator for those unaware), or possibly one of their fixed rising rate regulators.
Anyways, after LOTS of reading, Ive found the following formula:
the square root of (New Fuel Pressure/Old Fuel Pressure [in PSI] )* original injector flow (cc/min)
I have heard that anything more than around 75PSI through the stock injectors is NO good because:
1) The spray pattern gets completely screwed, therefore causing an inefficient explosion of the air/fuel mixture
2) The pressure becomes too high so the solenoid, or whatever it is, cant open against the pressure of the fuel. (Perhaps thats why WRX use "side-fed" injectors??
Anyway, does anybody know what the limit of the stock injectors are?? (Think turbotrana said they were around 200cc/min)
This means that if I run a rising rate regulator, and increase the OVERALL fuel pressure to around 80PSI (I'm assuming stock its 33PSI at a guess), then I could increase the flow of my injectors to just under 320cc (or I think just over 45KW each), allowing (theoretically) up to 270kw.
So, IF 80PSI is the maximum pressure injectors can handle, if I chose to run UP TO 10PSI through my turbo, I would set the rising rate to about 5:1 (ie. for every pound of boost, the fuel pressure increases by 5PSI).
All this of course, depends IF 80PSI is the limit.
Anybody know about the injectors limits?
(PS Sorry, bout the long post for those of you who don't like to read, but this information took me a few hours to find and understand)