Funny Looking VE Table?
Posted: Wed Sep 06, 2017 6:59 pm
I'll start with the hardware. 5.3, LS1 cam, China GT45 turbo, decapped stock injectors which flowed 82lb/hr at 58psi, run by a Gold Box with a TinyIOX that is handling the wideband and some extra I/O.
As you can see in the attached MSQ the VE values decrease under boost, this is the opposite of every other forced induction VE table I've seen. I'm not very worried about it, because the truck runs great(it went 98mph in the 1/8th on only 11psi), just trying to learn as much as I can about tuning and EFI.
I will add that the injector size in reqfuel is incorrect, I played with this early on to get the base tune closer and never fixed it. The actual flow of the injectors should be 74lb/hr(base fuel pressure is 50psi). Also, the injector dead time is likely not correct, I played with this some but haven't bothered to get it nailed down. I'm not sure how these could cause the funny VE values though.
As you can see in the attached MSQ the VE values decrease under boost, this is the opposite of every other forced induction VE table I've seen. I'm not very worried about it, because the truck runs great(it went 98mph in the 1/8th on only 11psi), just trying to learn as much as I can about tuning and EFI.
I will add that the injector size in reqfuel is incorrect, I played with this early on to get the base tune closer and never fixed it. The actual flow of the injectors should be 74lb/hr(base fuel pressure is 50psi). Also, the injector dead time is likely not correct, I played with this some but haven't bothered to get it nailed down. I'm not sure how these could cause the funny VE values though.