I have a lq4 in a swap vehicle that I threw a 7875 on running e85 with deka 80s.

With the aem 340lph pump i was running outta fuel over 13psi boost above 5k verified fuel pressure drop with gauge.

I had a 450 so crammed that in the basket. And still running lean with high inj duty cycle up top. Havent put the gauge back on it to see if I'm losing pressure or just out of injector.

Just trying to hear some thoughts from the more experienced. Think I'm outta injector or volume?

What's Average boost to fuel pump volume ratio on E? Like how much pump for "x" amount of boost?
Would like to know same for injectors...

 

You need a second pump . One pump will get you to 10 to14 psi on e85 depending on the pump .

add a second pump and turn it on at about 10 psi boost .

deka 80s will go a lot farther than most will believe. I have been 9.01 at 150 mph on them on e85 at 3500 lbs . And It wasn’t out of fuel yet.

 

Havent put the gauge back on it to see if I'm losing pressure or just out of injector.

^^ Start there.

 

That's the plan once I get some time for shenanigans

 

Why are you running such high fuel pressure when you've got a boost referenced regulator?? Turn it down to 43 psi and you'll get more life out of your pumps and fuel system in general