Boost-a-pump on LLT? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Pearlj10 · 08-01-2020, 10:38 PM

I’m SC-ed and running out of fuel at about 6100 rpm. Can anyone confirm that a JMS FuelMax or other fuel boost-a-pump will work with the LLT pump and FSCM? If so, is the tap wire on the FSCM the same color/amp as SS (red/white wire with 30 amp fuse)? Thanks

DSX_Camaro · 08-02-2020, 02:38 PM

ZL1 fuel pump for the tank. But how much power are you making? If you're on a smaller pulley over 10# you're gonna run out of fuel with the HPFP. Might be able to use LF3 or LF4 injectors and high pressure fuel pump?

Pearlj10 · 08-02-2020, 09:59 PM

Thanks for the reply. I was pulling 362 rwhp just shy of 6000 rpm and 9.5 lbs of boost. Running Overkill Stage 1, which is supposed to be 8-9 lbs of boost max. Tuner thought I’d max out at 12-13 lbs of boost and around 400 rwhp. The boost seems really high to me, and that’s with a 3-7/8” upper pulley. I can’t run a boost-a-pump on the LLT? If not, I’ll go with the ZL1 pump. Tuner thought that factory injectors should be adequate (?). My fuel pump is dropping from 1800 psi to around 800 psi at 6100 rpm.

bill522 · 08-03-2020, 07:57 AM

ZL1 fuel pump will help a lot, and you may want to explore the larger injectors that Will has used on some other builds ( #119 I think ?), and get the LF4 HPFP, which will also help. The problem with a boost-a-pump is that you are putting a bandaid on a larger problem ( dependable fuel supply). I am at 525+ to the wheels , but had to change to larger injectors, LF4 HPFP, methanol direct injection, and a change to an Aeromotive Camaro Eliminator Fuel System with Fuel Speed Controller to get there $$$$$. (2014 LFX V-6 Camaro)

Pearlj10 · 08-13-2020, 11:50 PM

Thanks Bill. That info is very helpful. I was watching my data logs and the tank pump appeared to be holding steady at about 60 psi, but I still saw fuel rail pressure drop from 1800 to 800 psi. A bit frightening. I’ll look into the HPFP options.

tlavoie87 · 08-14-2020, 02:50 PM

go with the zl1 in tank pump also do a fresh full read out with hptuners we now have access to the FPCM to turn up the pressure.. next step is cams with moded fuel lobe that good til about 450-500 with no meth .. injectors are a plus.. the lf4 hpfp wont work on the LLT and minimal gains on LFX. last resort is spray it with meth .. i have all of the above done except injetors at 500+ whp with room on the table

bill522 · 08-15-2020, 12:59 PM

Quote:

Originally Posted by tlavoie87

go with the zl1 in tank pump also do a fresh full read out with hptuners we now have access to the FPCM to turn up the pressure.. next step is cams with moded fuel lobe that good til about 450-500 with no meth .. injectors are a plus.. the lf4 hpfp wont work on the LLT and minimal gains on LFX. last resort is spray it with meth .. i have all of the above done except injetors at 500+ whp with room on the table

Sometimes I forget the difference in motors

Pearlj10 · 08-15-2020, 01:59 PM

I'm thinking that the tank LP fuel pump is providing enough volume/pressure and the HPFP is the weak link in my current situation. Here are some screenshots showing fuel rail pressure at WOT with things going well in the first shot, and then a rapid fuel rail pressure decrease in the next two shots. I was going to install an Alky meth kit to relieve some demand on the HPFP (and clean the valves!) but tlavoie87 mentioned that option as a last result. Advice is much appreciated. Thanks

fhrex · 08-15-2020, 09:02 PM

Christ, you guys are really talking some power here....I'm a OEM stock kinda guy....mine's a daily.

08-02-2020, 02:38 PM	#2
DSX_Camaro Drives: 2013 SW 2LT/RS LFX/AY6 Join Date: Feb 2013 Location: Orlando, FL Posts: 1,741	ZL1 fuel pump for the tank. But how much power are you making? If you're on a smaller pulley over 10# you're gonna run out of fuel with the HPFP. Might be able to use LF3 or LF4 injectors and high pressure fuel pump? __________________ K&N CAI, 1LE Strut Tower Brace, Elite Engineering Catch Can and Clean Side Separator, Apex Scoop w/ Washer Relocation Kit, CTS Front Calipers and Rotors, JacFab Ported Intake Manifold, JacFab Intake Manifold Spacer, 80mm Overkill Throttle Body, SS Brake Lines, Ideal Garage Master Cylinder, Monster Twin Disc Clutch, NPP Retrofit w/ Magnaflow Resonated X, ARH Catless Downpipes, JRE Built 3.45 Diff, 1LE Axles, 1LE Hubs, Overkill Tuned, BMR Anti Wheel-hop Kit Stage I, ACS TL1 Hood Insert, ZL1 Spoiler

08-14-2020, 02:50 PM	#6
tlavoie87 Built Not Bought Drives: 2010 Twin Turbo LFX Join Date: Jun 2016 Location: Massachusetts Posts: 618	go with the zl1 in tank pump also do a fresh full read out with hptuners we now have access to the FPCM to turn up the pressure.. next step is cams with moded fuel lobe that good til about 450-500 with no meth .. injectors are a plus.. the lf4 hpfp wont work on the LLT and minimal gains on LFX. last resort is spray it with meth .. i have all of the above done except injetors at 500+ whp with room on the table __________________ 2010 Twin Turbo LFX In Memory of my DAD Gone but never Forgotten 2014 "Built Not Bought!' Sponsors: OverKill Motorsports

08-15-2020, 09:02 PM	#9
fhrex Drives: 2011 Camaro 2LT/RS Join Date: May 2015 Location: Farmville, Virginia Posts: 1,022 View My Garage	Christ, you guys are really talking some power here....I'm a OEM stock kinda guy....mine's a daily. __________________

08-01-2020, 10:38 PM	#1
Pearlj10 Drives: 2011 Camaro 2LT Join Date: Oct 2018 Location: Az Posts: 367	Boost-a-pump on LLT? I’m SC-ed and running out of fuel at about 6100 rpm. Can anyone confirm that a JMS FuelMax or other fuel boost-a-pump will work with the LLT pump and FSCM? If so, is the tap wire on the FSCM the same color/amp as SS (red/white wire with 30 amp fuse)? Thanks

08-02-2020, 09:59 PM	#3
Pearlj10 Drives: 2011 Camaro 2LT Join Date: Oct 2018 Location: Az Posts: 367	Thanks for the reply. I was pulling 362 rwhp just shy of 6000 rpm and 9.5 lbs of boost. Running Overkill Stage 1, which is supposed to be 8-9 lbs of boost max. Tuner thought I’d max out at 12-13 lbs of boost and around 400 rwhp. The boost seems really high to me, and that’s with a 3-7/8” upper pulley. I can’t run a boost-a-pump on the LLT? If not, I’ll go with the ZL1 pump. Tuner thought that factory injectors should be adequate (?). My fuel pump is dropping from 1800 psi to around 800 psi at 6100 rpm.

08-03-2020, 07:57 AM	#4
bill522 Drives: 2014 LS Camaro Join Date: Jan 2019 Location: Florida Posts: 113	ZL1 fuel pump will help a lot, and you may want to explore the larger injectors that Will has used on some other builds ( #119 I think ?), and get the LF4 HPFP, which will also help. The problem with a boost-a-pump is that you are putting a bandaid on a larger problem ( dependable fuel supply). I am at 525+ to the wheels , but had to change to larger injectors, LF4 HPFP, methanol direct injection, and a change to an Aeromotive Camaro Eliminator Fuel System with Fuel Speed Controller to get there $$$$$. (2014 LFX V-6 Camaro)

08-13-2020, 11:50 PM	#5
Pearlj10 Drives: 2011 Camaro 2LT Join Date: Oct 2018 Location: Az Posts: 367	Thanks Bill. That info is very helpful. I was watching my data logs and the tank pump appeared to be holding steady at about 60 psi, but I still saw fuel rail pressure drop from 1800 to 800 psi. A bit frightening. I’ll look into the HPFP options.