Tuning perspective on high fuel pressure vs low?
04-24-2006, 02:43 PM
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Tuning perspective on high fuel pressure vs low? For the thread's sake I'll leave this question open to N/A and FI cars, but for my scenario I'd like to know about N/A. 
Just to reitterate, I'd like to look at this from a tuning perspective if possible (mods, please don't move this 
).
I'm running an Aeromotive regulator on a H/C car, racetronix P&P fuel pump, and SVO 42lb injectors. My fuel pressure is still set at the 62psi I was running with the SVO 30lb'ers, but I'm wondering if I'd be better served to back off the pressure since I'm around 65% duty cycle right now. I've heard that running a higher fuel pressure can lead to a more erratic spray pattern for the injector, but I don't completely understand what the consequences of this are, and I'm curious about details as to what it does to the way the car runs. I'm considering dropping my fuel pressure down to around 50psi or so.
Any thoughts or opinions for high OR low pressure on this one?
Just to reitterate, I'd like to look at this from a tuning perspective if possible (mods, please don't move this ).I'm running an Aeromotive regulator on a H/C car, racetronix P&P fuel pump, and SVO 42lb injectors. My fuel pressure is still set at the 62psi I was running with the SVO 30lb'ers, but I'm wondering if I'd be better served to back off the pressure since I'm around 65% duty cycle right now. I've heard that running a higher fuel pressure can lead to a more erratic spray pattern for the injector, but I don't completely understand what the consequences of this are, and I'm curious about details as to what it does to the way the car runs. I'm considering dropping my fuel pressure down to around 50psi or so.
Any thoughts or opinions for high OR low pressure on this one?
04-24-2006, 03:23 PM
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Lower pressure will load the pump less and allow more volume to flow before a pressure drop results.
It may also add some control & resolution at very small PW's.
It may also add some control & resolution at very small PW's.
04-26-2006, 10:04 AM
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Sounds like enough of a reason to drop it to me.
Should provide a good chance to log and provide proof that the Injector spreadsheet at allmod.net is accurate too.
Should provide a good chance to log and provide proof that the Injector spreadsheet at allmod.net is accurate too.