[TJay74]

Originally Posted by KingLT1

That's not how it works. They flow +30% more then a LT4 injector at 2800psi. You won't get that flow if your fuel supply to the injectors isn't up to par and the pressure drops low enough where the injectors open up past the point of safe injection(6.4ms). Normally the last thing that needs changed on a LT4 system is the injector. Low side usually goes first, then high side, then injectors.

Low side solution(s)- JMS booster, Aux fuel pump, For innovations intank pump.

High side- Cam with bigger lobe, LPE DI pump with matching cam, or Katech belt driven DI pump.

All in one solution...Weapon X SPI port injection with low side pump.


It all comes down to power goals. I seen a ZL1 make close to 800whp on E85 with FIC +30, Cam wit 32% lobe, LPE DI pump, and aux low side. Meth and pump gas would get by with less fuel mods. Meth and Race fuel could make those numbers on the stock LT4 fuel system. So a lot of it has to do with the type of fuel you plan on running as well.

I wonder how the Katech +30% injectors would work with the full LT4 fuel system and their injectors as a stage 1 option and then a stage 2 option being to change out the cam with a +30% fuel lobe cam?

Originally Posted by Bmf5150

Honestly I rather run a little low side injection as well to keep the valve clean .

Huh, that isnt how the DI injection system works at all. The DI injectors dont spray any fuel at the valves at all, no matter what change is made in regards to a different injector or a upgraded LPFP, or HPFP. The injector tip is physically inside of the combustion port and fires the fuel right into the chamber of the piston and the spark plug.

The only way to introduce any fuel back into the pre intake valve side loop is to add a port fuel injection solution that spray fuel into the intake runners in an atomized suspension. At that point then you will get some fuel wash across the backside of the intake valve.