The intake bends would have already been taken into account because you are reading manifold pressure at the MAP sensor. You may make 8 psi at the turbo, then through the intercooler and intake bends drop down to 5psi at the manifold due to friction losses. The boost/IAT at the manifold will tell you the volume of air ready to enter each cylinder depending on how much the cam/valvetrain will allow. Then on the exit you will experience backpressure from the turbo depending on AR, the larger turbos generating the same boost as smaller turbos will likely have less backpressure. Reduced backpressure allows for a cleaner discharge of exhaust gas leaving more room for fresh mixture on the intake stroke.

I belive IATs are having an effect on this boost vs. boost comparison. Air density is related to temp. and pressure. Hot air expands and you will not fit as much hot air in the cylinder as cool air at the same pressure.

This thread shows the quality of members on this forum, it could have turned into a giant bash fest, but instead a usefull technical discussion

 

Indeed
Thank you all.

I forgot about IAT. And I didn't want to bring efficiency into it.

 

I thought that it was a gain of psi for every bend and turn in the intake piping. Not a loss?

 

OK, now the plot thickens. I was really running 4.5psi because my dumbass loss my wastegate valve seat . I now have efi live so next time out I will log both these vehicles. He is interested in the data as well. As for me having more cubes, he has alot more $$$ in his setup so, its not my fault. I am out to prove you don't need a 15k budget to make a gen 3 truck run fast.

 

IMO the cam makes up the cube deficit but thats just me.

 

There is a gain of pressure from the compressor up until the bend, but that pressure and certainly more airflow isn't seen at the intake manifold. The higher the boost though, the less it is an issue.

 

Great info, guys. I do have other questions on this topic but, I think its getting I dont mean to hijack.

 

Ahh yes the TOPIC. Headline reads,

"Dyno-queening, inefficient, pieced together, home-brew intercooled butt turbo prevails against the all mighty omni-powerful magnacharger.

the timeslip is in a landfill ...sorry

 

Good on ya Bro! Even my turbo owning *** thinks this thread is getting lame

 

It'll get better if the magnacharger wins next time tho huh?