Future Gen-V LT Swap?

[donjetman]

Interesting:
https://www.lsxmag.com/tech-stories/l8t-to-the-party-indirect-effects-with-direct-injection/

 

[Marky Dissod]

That article overlooks one thing:
The Gen5 LT5 uses BOTH direct injection (into the combustion chamber during the 'squeeze' phase)
AND port fuel injection (into the intake port during the 'suck' phase which is actually under supercharger pressure).

 

[j91z28d1]

can any of the stand alone ecm's even run DI and port at the same time yet? cause you really need both to make power. direct injection hardware is crazy expensive to run more fuel than stock. only way I could see a cost effective swap would be a junk yard 5.3Lt. leave the stock di stuff in place. add port injection for boost fuel and run it off something easier to tune like holley and be OK with its running kinda bad around town.


and from the article.

When going from DI to port injection, you can expect a drop in power of about 4 percent on pump gas, 8 percent on E85, and 12 percent on methanol. — Brian Tooley, Brian Tooley Racing

there's no way I'm dealing with the extra di headaches in a swap for 4 precent more power. these people are crazy.

 

[Marky Dissod]

When going from DI to port injection, you can expect a drop in power of about 4 percent on pump gas, 8 percent on E85, and 12 percent on methanol.
— Brian Tooley, Brian Tooley Racing

So many assumptions and suppositions in this sentence, it'd take DAYS to unpack them all.
Here's ONE:
MultiPort Fuel Injection sprays the back of the open intake valve gap @ 43.5psi-58psi.
Direct Injection fires in the combustion chamber during the squeeze @ 2200psi-2900psi.
Could MPFI be improved by increasing the pressure?
By the way, increasing fuel pressure on a mid90s LT1 from 43.5psi to 58psi,
even leaving the injector constant alone, is worth 2 or 3MpG, and about 10 peak horses - a 4% gain.

Reality is that Direct Fuel Injection is about emissions, not power / torque / MpGs / BSFC.