LT4 HPFP/Injectors
Drifting
Joined: Oct 2002
Posts: 1,898
Likes: 35
From: Fairview Hts. IL
will it work? Yes. Should you do it? No. Why? The C7 has a known issue that when the intank pump is worked too hard it will overheat and die under racing conditions on C7’s that haven’t even been modified. Several people have had their C7’s bought back through lemon law as a result of this. Because everytime they would replace the pump the owner could replicate the issue again under the same conditions.
The ZR1 and the 2019 Z06, (and only the 2019 Z06, not prior years) were believed to have a higher flowing pump, however, if I remember correctly it was discovered that the pump is voltage regulated to run at a lower PSI than all the prior year C7 in tank pumps (which were all the exact same regardless of Z06 or non-Z06 prior to 2019) until it was commanded to pump higher, at which point it would be cooler for a longer period of time to fight the overheating issue. The max PSI on the low side remained the same though. If I remember correctly, all C7 up through 2018 flowed 72 PSI on the low side. In 2019 they flowed around 59 PSI and then when commanded higher based on acceleration demand they would raise to 72 PSI.
Knowing this information, do you feel comfortable trying to boost this pump? I sure don’t..
- Ant
Unlike NA setups, in a forced induction setup, voltage fluctuation results in different fuel pressure. If the voltage delivered to the pump becomes low, the pump will not deliver the fuel at the right fuel pressure. So, to answer your question, yes. As of now, I have 0 concerns with adding a voltage booster. If the fuel pump is bad...it's bad...supplying the correct voltage (that the fuel pump is designed to receive) will not be a cause for failure. Personally, I would be more concerned about voltage fluctuation resulting in inconsistent fuel pressure...
I will talk to my tuner to get his thoughts. Thanks for the heads up.
Last edited by hogurt; Jan 15, 2019 at 07:05 PM.
I'm Batman..
Joined: Apr 2014
Posts: 6,142
Likes: 920
From: Lehigh Acres FL
Tech Contributor
Good question and interesting data. Just thinking through that information, here are my initial thoughts: I don't believe a voltage booster causes the pump to "work harder". The fuel pump needs a certain amount of voltage to perform correctly. In normal driving without boost, the drops in voltage and drops in fuel pressure aren't that big of a deal. I will have to get some logs of my car and see what it shows.
Unlike NA setups, in a forced induction setup, voltage fluctuation results in different fuel pressure. If the voltage delivered to the pump becomes low, the pump will not deliver the fuel at the right fuel pressure. So, to answer your question, yes. As of now, I have 0 concerns with adding a voltage booster. If the fuel pump is bad...it's bad...supplying the correct voltage (that the fuel pump is designed to receive) will not be a cause for failure. Personally, I would be more concerned about voltage fluctuation resulting in inconsistent fuel pressure...
I will talk to my tuner to get his thoughts. Thanks for the heads up.
Unlike NA setups, in a forced induction setup, voltage fluctuation results in different fuel pressure. If the voltage delivered to the pump becomes low, the pump will not deliver the fuel at the right fuel pressure. So, to answer your question, yes. As of now, I have 0 concerns with adding a voltage booster. If the fuel pump is bad...it's bad...supplying the correct voltage (that the fuel pump is designed to receive) will not be a cause for failure. Personally, I would be more concerned about voltage fluctuation resulting in inconsistent fuel pressure...
I will talk to my tuner to get his thoughts. Thanks for the heads up.
Le Mans Master
Joined: Mar 2010
Posts: 7,043
Likes: 944
From: DFW TX
It in effect “overspins” the pump similar to pulleying down on a supercharger.
Pro
Joined: Aug 2018
Posts: 652
Likes: 156
From: Clarksville, TN
I believe the LT1 fuel system runs out just over 600whp. If I went with the LT4 HPFP and LT4 injectors what kinda power are they good for on a boosted LT1? I don't want to use meth and I'm not looking to make crazy power. I'm looking to make around 625whp being I'll be limited by the stock pistons.
I'm assuming if i go this route I'll be limited to the same stock fuel limits of a stock Zo6, I just haven't heard what that is.
I'm assuming if i go this route I'll be limited to the same stock fuel limits of a stock Zo6, I just haven't heard what that is.
