Base fuel pressure 43.5 psi vs 58 psi - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

BigMatt · 06-29-2023, 08:52 AM

Boost reference return fuel system guys: what do you set your base fuel pressure to? I've been reading mixed things on whether to run at 43.5 vs 58psi. I'm running twin 450 in pumps with id1300x injectors aeromotive boost reference regulator -10feed -8 return lines. I've heard that running 43.5psi will not provide enough pressure for the suction from the passenger saddle to pull fuel to the drivers saddle. Anybody have any feedback on if this is true or not? Thanks in advance for any help.

NoDakZ/28 · 06-29-2023, 09:19 AM

I ran 58lbs base pressure with my twin turbo 1le on a twin pump fore system and once 1psi was reached second pump turned on to achieve 65psi. That was on FIC 1000cc injectors on E85.

dreksnot · 06-29-2023, 10:04 AM

I used to run 58psi but have since dropped to 43.5psi to generate less heat. I have triple Fore Hellcat pumps and had not experienced what you said (not enough suction, which makes no sense).

FasNuf · 06-29-2023, 10:17 AM

I've heard that 43.5 psi doesn't allow the fuel to atomize as well as higher pressure but I never noticed an issue.

I started at 43.5 but on E85 my Injector DC was too high at redline. Changing to 58psi would put my 1200cc injectors to over the 127 lb/hr hard limit in the ECM and I didn't want to scale the tune.
I put it at 50psi and now I'm 78% Inj.DC at redline on the E85 and still able to have a stable idle.

My issue was my injectors were slightly too big and running higher pressure made my idle a little wonky because it hit an area the injector couldn't control. Lowering my pressure allowed the injector to get into that area so the idle would stabilize.

Dreksnot has a good point on the heat and besides, why make the pump work harder if it doesn't have to.
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BigMatt · 06-29-2023, 10:27 AM

Quote:

Originally Posted by dreksnot

I used to run 58psi but have since dropped to 43.5psi to generate less heat. I have triple Fore Hellcat pumps and had not experienced what you said (not enough suction, which makes no sense).

The heat generated by the higher fuel pressure was my biggest concern as well.

06-29-2023, 08:52 AM	#1
BigMatt 2010 Camaro 2 SS/RS M6 Drives: 2010 Camaro SS/RS Join Date: May 2009 Location: Clayton Delaware Posts: 1,218 View My Garage	Base fuel pressure 43.5 psi vs 58 psi Boost reference return fuel system guys: what do you set your base fuel pressure to? I've been reading mixed things on whether to run at 43.5 vs 58psi. I'm running twin 450 in pumps with id1300x injectors aeromotive boost reference regulator -10feed -8 return lines. I've heard that running 43.5psi will not provide enough pressure for the suction from the passenger saddle to pull fuel to the drivers saddle. Anybody have any feedback on if this is true or not? Thanks in advance for any help. __________________ Forged LS3, FED M311 heads, CAI Inc, ARH 1 7/8, Corsa Xtreme, Taylor Wires, MGW Shifter, Street slayer twin carbon clutch, Tick braided clutch line & speed bleeder, ZL1 Diff Swap, BMR Split drop, Sway Bars, Trailing Arms, Toe Rods, Pro bushing kit, Carslyle racing 15in conversion, Whipple, LPE dual fuel pumps, Rx catch can, Id1300x, Alky Control

06-29-2023, 09:19 AM	#2
NoDakZ/28 Drives: 2014 Z/28 CTF Join Date: Sep 2017 Location: North Dakota Posts: 626 View My Garage	I ran 58lbs base pressure with my twin turbo 1le on a twin pump fore system and once 1psi was reached second pump turned on to achieve 65psi. That was on FIC 1000cc injectors on E85. __________________ 2014 1LE - Sold 2014 Z/28 #99008 CTF SIM

06-29-2023, 10:04 AM	#3
dreksnot Served USN - Atomic Chimp Drives: 13 Camaro LSX434 TT M6, 21 ZLE A10 Join Date: Jul 2012 Location: Fort Collins, CO Posts: 1,605 View My Garage	I used to run 58psi but have since dropped to 43.5psi to generate less heat. I have triple Fore Hellcat pumps and had not experienced what you said (not enough suction, which makes no sense). __________________ In excess of 1,000WHP LSX434 \| AGP 65/65 TT \| BTR Equalizer Intake \| Trickflow 245cc cathedral \| BTR custom cam \| Cortex EBC \| n2mb WOT \| ID-1700x \| Brisk GR12S \| RPM Lv 7 TR6060 \| AGP's Triple 525LPH Fore Fuel \| Monster LT1-S Triple \| 4.11 DSS Proform 9", CF driveshaft, 1400hp axles \| Hurst Line Lock \| MGW Retro Short Throw w/old skool Hurst T-handle \| ADM solid subframe mounts \| Prothane Motor Mounts \| Revshift Poly Trans insert \| Moreno camber/caster plates

06-29-2023, 10:17 AM	#4
FasNuf Drives: 2014 Camaro ZL1 Join Date: Jul 2019 Location: Oregon Posts: 1,617 View My Garage	I've heard that 43.5 psi doesn't allow the fuel to atomize as well as higher pressure but I never noticed an issue. I started at 43.5 but on E85 my Injector DC was too high at redline. Changing to 58psi would put my 1200cc injectors to over the 127 lb/hr hard limit in the ECM and I didn't want to scale the tune. I put it at 50psi and now I'm 78% Inj.DC at redline on the E85 and still able to have a stable idle. My issue was my injectors were slightly too big and running higher pressure made my idle a little wonky because it hit an area the injector couldn't control. Lowering my pressure allowed the injector to get into that area so the idle would stabilize. Dreksnot has a good point on the heat and besides, why make the pump work harder if it doesn't have to. . . . . . .. __________________ . . . . https://www.youtube.com/channel/UCgN...etl17hA/videos Last edited by FasNuf; 06-29-2023 at 11:20 AM.