Need some fuel system expert advice - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

manbag83 · 08-24-2018, 05:10 PM

So I have a 2011 SS. Fully built lq9. 2.8 kB, 90lb injectors. etc. Swapped a Lonnie’s drop in double pump, a few years back, which is basically a ctsv pump. I just recently put in the deatschwerks dw300c (340lph) pumps to increase ability. I’m still having fuel pressures drop to 45 at wot. The car still has a stock fpcm and fuel lines. Thoughts.

hunter1660 · 08-24-2018, 08:45 PM

Reading on hptuners, the stock ss pump with the ss Fpcm flashed with the zl1 Fpcm data falls on its face past 6000rpm. Is your ss Fpcm flashed with the zl1 or maybe the ctsv data?

agent5 · 08-24-2018, 09:28 PM

Would a BAP help in this case?

hunter1660 · 08-24-2018, 09:50 PM

Reading on hptuners forum, The programming in the ss Fpcm causes the fuel pressure to drop from 58 psi to 49 psi at 3000 rpms and up. Flashing it with the zl1 programming the ss Fpcm carries the 58psi thru 6000 rpms. not sure what the findings were with bap.

Slickcas · 08-25-2018, 02:16 AM

Can the Stock FPCM supply the amps needed for the 340s? Also how well do they work with a PWM type of speed adjustment.
That’s why most people eliminate the FPCM and go with a regulated returned style.
I am running a ZL1 pump NO BAP with the fuel pressure set 450(65psi) at every RPM. Also a DSX Auxiliary fuel pump set to turn on at 4 psi. With the ID1050x fuel injectors and VP E85 she holds steady at 65 psi. I am putting down 684RWHP with going through a TH400.

Pro-tuned · 08-26-2018, 01:37 PM

I’m running LQ9 and whipple. I run dual Fore, eliminated FPCM, BAP, ... never had an issue since. Rock solid fuel pressure throughout.

scv_guy · 08-26-2018, 02:10 PM

Quote:

Originally Posted by Slickcas

Can the Stock FPCM supply the amps needed for the 340s? Also how well do they work with a PWM type of speed adjustment.
That’s why most people eliminate the FPCM and go with a regulated returned style.
I am running a ZL1 pump NO BAP with the fuel pressure set 450(65psi) at every RPM. Also a DSX Auxiliary fuel pump set to turn on at 4 psi. With the ID1050x fuel injectors and VP E85 she holds steady at 65 psi. I am putting down 684RWHP with going through a TH400.

Been down this road I had basically the same fuel system you have. To answer your question no the FPCM is limited by the amount of current (Amps) it can supply to the fuel pumps. On a hard pull you will get a MIL do to FPCM at it limit. You have a few options
1. Get rid of the FPCM and pick up a Vaporworx controller they work great I'm still running mine with my Fore innovations dual 450s.
2. Run your current pumps in a return style
3. Depending on your power goals step up to a full fuel system.
As I said I have done the exact same thing you did. Let me know if you have any questions.

08-24-2018, 05:10 PM	#1
manbag83 Drives: 2011 Camaro 2SSRS YUDLOSE Join Date: Mar 2012 Location: San Antonio, TX Posts: 117 View My Garage	Need some fuel system expert advice So I have a 2011 SS. Fully built lq9. 2.8 kB, 90lb injectors. etc. Swapped a Lonnie’s drop in double pump, a few years back, which is basically a ctsv pump. I just recently put in the deatschwerks dw300c (340lph) pumps to increase ability. I’m still having fuel pressures drop to 45 at wot. The car still has a stock fpcm and fuel lines. Thoughts. __________________ ^777RWHP/680TQ^ Last edited by manbag83; 08-24-2018 at 05:27 PM.

08-24-2018, 08:45 PM	#2
hunter1660 Drives: 2011ss/rs camaro Join Date: Sep 2011 Location: florida Posts: 1,261	Reading on hptuners, the stock ss pump with the ss Fpcm flashed with the zl1 Fpcm data falls on its face past 6000rpm. Is your ss Fpcm flashed with the zl1 or maybe the ctsv data? __________________ . OBX LTH,Rotofab,Magnuson Heartbeat.AEM wideband, HP Tuners

08-24-2018, 09:50 PM	#4
hunter1660 Drives: 2011ss/rs camaro Join Date: Sep 2011 Location: florida Posts: 1,261	Reading on hptuners forum, The programming in the ss Fpcm causes the fuel pressure to drop from 58 psi to 49 psi at 3000 rpms and up. Flashing it with the zl1 programming the ss Fpcm carries the 58psi thru 6000 rpms. not sure what the findings were with bap. __________________ . OBX LTH,Rotofab,Magnuson Heartbeat.AEM wideband, HP Tuners

08-26-2018, 01:37 PM	#6
Pro-tuned Angewendet Ingenieur Drives: 14 Camaro ZL1 Join Date: Apr 2015 Location: USA Posts: 401	I’m running LQ9 and whipple. I run dual Fore, eliminated FPCM, BAP, ... never had an issue since. Rock solid fuel pressure throughout. __________________ ———— LQ9, Iron Block, Forged internals, 408CI, Jannetty custom cam, TS short block, Whipple, Hardened Jackshaft, PRC 260, 2X3 Dynatech Full Competition, HF Cats, CAI, NW 103, Chee, ID 1300, COPO Breather, MSD, Fore Dual Pump, ultratorque, E85, dual Meth, True Trac, 3:45, 1500hp axle-shafts, DSS CF, BMR, custom Pearl/Candy paint by Jaidah.

08-24-2018, 09:28 PM	#3
agent5 Drives: 2013 Camaro SS (+RS) + Hurst+ DME Join Date: Sep 2012 Location: Saint Louis, MO,United States Posts: 147	Would a BAP help in this case?

08-25-2018, 02:16 AM	#5
Slickcas Drives: 12' 2SS/RS LS3 IBM Join Date: Nov 2011 Location: Odin. ILL Posts: 487 View My Garage	Can the Stock FPCM supply the amps needed for the 340s? Also how well do they work with a PWM type of speed adjustment. That’s why most people eliminate the FPCM and go with a regulated returned style. I am running a ZL1 pump NO BAP with the fuel pressure set 450(65psi) at every RPM. Also a DSX Auxiliary fuel pump set to turn on at 4 psi. With the ID1050x fuel injectors and VP E85 she holds steady at 65 psi. I am putting down 684RWHP with going through a TH400.