Low side fuel pump
Thread Starter
Pro Mechanic
Joined: Mar 2007
Posts: 397
Likes: 4
From: San Antonio, Texas
Low side fuel pump
Anyone know the specs on the LT4/LT5 low side fuel pump. Looking for a stock fuel pump to run my LSA in a C5 chassis with around 800fwhp. Running an aftermarket fuel pump controller and not GM wiring.
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor
I don’t known the exact specs but the LT4 pump is same as LT5 for 2019 and later. The max PSI is the same as all prior years actually just uses a different control module that regulates it better. I have one available and ready if you’re looking for one.
Ant
Ant
Thread Starter
Pro Mechanic
Joined: Mar 2007
Posts: 397
Likes: 4
From: San Antonio, Texas
I'm not really sure yet. I could really use measurements though to see if it will fit into a late C5 or C6 fuel tank though. It seems almost impossible to find any info on this pump. In theory it's supplying enough fuel for 755hp to 8 direct injectors and 8 regular fuel injectors, so it should support 800 through 8 regular injectors I would think.
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor
I'm not really sure yet. I could really use measurements though to see if it will fit into a late C5 or C6 fuel tank though. It seems almost impossible to find any info on this pump. In theory it's supplying enough fuel for 755hp to 8 direct injectors and 8 regular fuel injectors, so it should support 800 through 8 regular injectors I would think.
PSI.
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
LPE makes a nice 225 lph pump that works great in the C5 basket and runs off of the stock wiring. You could add a RaceTronix hot wire kit to the pump also to maintain better voltage to the pump for more output. I doubt it will feed 800hp though. No stock pump will feed that much power, except MAYBE a C6 ZR1 pump...with a Boost a Pump box on it.
i ran the LPE pump as my primary pump and a Bosch 044 for a secondary pump that came on with boost on my C5Z. Perfect setup, never had a problem in 15k miles... at 900 rwhp
Thread Starter
Pro Mechanic
Joined: Mar 2007
Posts: 397
Likes: 4
From: San Antonio, Texas
LPE makes a nice 225 lph pump that works great in the C5 basket and runs off of the stock wiring. You could add a RaceTronix hot wire kit to the pump also to maintain better voltage to the pump for more output. I doubt it will feed 800hp though. No stock pump will feed that much power, except MAYBE a C6 ZR1 pump...with a Boost a Pump box on it.
i ran the LPE pump as my primary pump and a Bosch 044 for a secondary pump that came on with boost on my C5Z. Perfect setup, never had a problem in 15k miles... at 900 rwhp
i ran the LPE pump as my primary pump and a Bosch 044 for a secondary pump that came on with boost on my C5Z. Perfect setup, never had a problem in 15k miles... at 900 rwhp
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor
ZR1 pump is 3 phase and needs a fuel pump control module. That’s why I was asking about the C7 LT4/5 pump because it doesn’t require the same kind of controller and I can run a Vapor Worx setup with it. I’m really trying to stay with a GM pump if I can and not a piggy back system or a boost a pump as this is more road course setup.
Last edited by FYREANT; Sep 16, 2019 at 08:34 AM.
Thread Starter
Pro Mechanic
Joined: Mar 2007
Posts: 397
Likes: 4
From: San Antonio, Texas
You do realize that the ZR1 has an LT5 in it right? The ZR1 (LT5) AND the Z06 (LT4) for 2019+ both uses the same pump with that use that new module. And it does not pump more than prior years. So if you don’t want to deal with the new module, then you’re going to need a 2014-2018 pump and those are all the same across all models for those years.
Last edited by CamaroAJ; Sep 16, 2019 at 09:39 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor
I do, that’s why I typed LT4/5. He specifically said the C6 ZR1 pump though, which is 3 phase. I see where I wasn’t clear on what gen ZR1 I was replying about so I understand how that could be misunderstood. I’m specifically asking about the 19+ pump to try and retrofit it into a C5/6 fuel tank as it’s not 3 phase and can be pulse width modulated for low flow driving and ramped up for when in boost with a stand alone fuel pressure/boost referenced module that Vapor Worx makes.
Thread Starter
Pro Mechanic
Joined: Mar 2007
Posts: 397
Likes: 4
From: San Antonio, Texas
Then yes, I could use measurements to compare to a C5 tank. I think height and diameter should work along with any pictures you can share of it. Thank you.
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor
I’ll have to get measurements later tonight or tomorrow. Its buried in a box in my “parts room” so I gotta find it lol
Thread Starter
Pro Mechanic
Joined: Mar 2007
Posts: 397
Likes: 4
From: San Antonio, Texas
Have pics already in my for sale thread here: https://www.corvetteforum.com/forums...brand-new.html
I’ll have to get measurements later tonight or tomorrow. Its buried in a box in my “parts room” so I gotta find it lol
I’ll have to get measurements later tonight or tomorrow. Its buried in a box in my “parts room” so I gotta find it lol
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor
Sorry it took a few days to find it. 15’ to the top, 13 1/4” compressed, and 4 3/4” across the top (the very top lip edge to edge) and 3 3/4” edge to edge of the part below the lip that would sit inside the tank (right under the lip).
Thread Starter
Pro Mechanic
Joined: Mar 2007
Posts: 397
Likes: 4
From: San Antonio, Texas
Thank you for checking that for me. That’s awesome that a C7 pump will fit in the C5 fuel tank. Looks like I’ll just need the in tank cross over hose and I should be good to go.
Thread Starter
Pro Mechanic
Joined: Mar 2007
Posts: 397
Likes: 4
From: San Antonio, Texas
Looks like the LT4/5 fuel pump will support 800 fwhp on my LSA. Here are the flow numbers I got back on it compared to the CTS-V pumps.
At 60psi = 1.37gal/min, 82.2gal/hr.
At 6lbs/gal, = 82.2 * 6 = 493.2 lbs/hr
Most modern supercharged engines up to 750hp need 0.6 lbs per hour per horsepower (Brake Specific Fuel Consumption/BSFC) 493.2/0.6 = 822hp.
CTS-VLH, CTS-VRH, 2019 Z06/ZR1 (liters per minute.)
40psi 6.28 6.35 6.30
45psi 5.95 5.96 6.02
50psi 5.61 5.66 5.75
55psi 5.39 5.38 5.54
60psi 5.02 5.03 5.18
65psi 4.22 4.35 4.92
70psi.............. 4.65
75psi.............. 4.35
80psi ..............3.13
86psi ..............0
At 60psi = 1.37gal/min, 82.2gal/hr.
At 6lbs/gal, = 82.2 * 6 = 493.2 lbs/hr
Most modern supercharged engines up to 750hp need 0.6 lbs per hour per horsepower (Brake Specific Fuel Consumption/BSFC) 493.2/0.6 = 822hp.
CTS-VLH, CTS-VRH, 2019 Z06/ZR1 (liters per minute.)
40psi 6.28 6.35 6.30
45psi 5.95 5.96 6.02
50psi 5.61 5.66 5.75
55psi 5.39 5.38 5.54
60psi 5.02 5.03 5.18
65psi 4.22 4.35 4.92
70psi.............. 4.65
75psi.............. 4.35
80psi ..............3.13
86psi ..............0
Last edited by CamaroAJ; Oct 14, 2019 at 05:09 PM.
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor
Looks like the LT4/5 fuel pump will support 800 fwhp on my LSA. Here are the flow numbers I got back on it compared to the CTS-V pumps.
At 60psi = 1.37gal/min, 82.2gal/hr.
At 6lbs/gal, = 82.2 * 6 = 493.2 lbs/hr
Most modern supercharged engines up to 750hp need 0.6 lbs per hour per horsepower (Brake Specific Fuel Consumption/BSFC) 493.2/0.6 = 822hp.
CTS-VLH, CTS-VRH, 2019 Z06/ZR1 (liters per minute.)
40psi 6.28 6.35 6.30
45psi 5.95 5.96 6.02
50psi 5.61 5.66 5.75
55psi 5.39 5.38 5.54
60psi 5.02 5.03 5.18
65psi 4.22 4.35 4.92
70psi.............. 4.65
75psi.............. 4.35
80psi ..............3.13
86psi ..............0
At 60psi = 1.37gal/min, 82.2gal/hr.
At 6lbs/gal, = 82.2 * 6 = 493.2 lbs/hr
Most modern supercharged engines up to 750hp need 0.6 lbs per hour per horsepower (Brake Specific Fuel Consumption/BSFC) 493.2/0.6 = 822hp.
CTS-VLH, CTS-VRH, 2019 Z06/ZR1 (liters per minute.)
40psi 6.28 6.35 6.30
45psi 5.95 5.96 6.02
50psi 5.61 5.66 5.75
55psi 5.39 5.38 5.54
60psi 5.02 5.03 5.18
65psi 4.22 4.35 4.92
70psi.............. 4.65
75psi.............. 4.35
80psi ..............3.13
86psi ..............0
Thread Starter
Pro Mechanic
Joined: Mar 2007
Posts: 397
Likes: 4
From: San Antonio, Texas
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 921
From: Lehigh Acres FL
Tech Contributor