Quote:
Originally Posted by KingLT1
Again the low side isn't dropping enough to cause the high side to strain. If the low side drops too far, then the high side drops, and the injectors pulse open up. That is how it works plain and simple. If the Injectors and High side parameters remain constant without fluctuation through the entire pull then the engine is getting the fuel.
|
King you are correct, if the high side is holding - you have plenty of low side - I don't car how low the low side gets.
As a matter of fact we drop the low side on our Camaro to 35 PSI at idle, cruise, and a good portion of part throttle, then bring it to 50 at WOT. No reason to run the pumps hard if it's not needed.
The high side is a positive displacement pump and fuel (unlike air) is essentially incompressible, so no matter how much pressure you run on the low side the high side is going to pump the same amount, up to the point where you start reaching the flow capability of the pumps inlet port internal passages. At that point you can find a bit more flow through the HP pump by raising the low side above 50psi - but this is in the order of 3-5% more flow...