09-29-2020, 05:55 PM
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#23
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Moderator
Drives: 2017 Camaro 2SS A8
Join Date: Aug 2018
Location: New Ipswich NH
Posts: 6,350
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Quote:
Originally Posted by toohighpsi
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...
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So Mike, am I screwing up by commanding 72 psi on my low side? It struggles to keep up, but the high side is not dropping off.
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, ATI 8L90, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors & BB HPFP, TooHighPSI/Katech port injection, 15” conversion 1066 WHP STD/1027 SAE, 9.10@152.5 (new times coming)
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