Wanted to share some information that I got today. I made a small cheap mod on my truck which cost me $20 and I found myself with some big increases...thought I'd share so people can get an idea on what kinda difference this makes and some feedback, this isn't permanent but will work for now.
I previously had the stock STS PCV crankcase system on my truck which had caused me a few moment of concern in the past. I'd like to run a vacuum pump off my crankcase but for now I just vented it to the atmosphere.
Here's the results. (I have some dyno sheets and will post them tomorrow if I can)

Previous Numbers @ 17.2psi...
579 rwhp
682 rwtq

New Numbers @ 18.1psi...
623 rwhp
726 rwtq

Power Gained w/ 1psi
44 rwhp
44 rwtq

Just wanted to get some feedback or even some possible previous comparisons of others who might have done this mod.
I'm planning on making dyno runs between every upgrade/modification that I have left to do because I'm curious on the results. Mods still left to do are larger A/R housing, enlarge hot side piping, meth injection and upgrade chintzy boost controller because I'm seeing too much spiking.

 

 

Good gains, but I'm curious to know why removing the PCV system netted you more boost.

 

nice man. now lets see it run some times

 

are you venting just a hose from the valve cover to the atmosphere?? or is the pcv valve still there, and you are just letting the hose vent out instead of the intake??

im trying to figure out where these gains have come from unless you had oil going thru your pcv system and maybe that was causing the loss of power...

nut i imagine you would know if you were sucking up enough to do taht i think you would know it

 

Nice numbers....

 

Congrats those are some nice gains.

 

Very nice!

 

yeah but also remember two different days on the dyno can change numbers too. i would have hooked it back up and then see what the differences were.

 

Not sure if the evac system is responsible for that actually. I'd guess not, but it's possible I'm missing something in my logic. I'm having some problems with my $6 cheapo boost controller...that could be the culprit but I've never seen 18psi before.

PCV valve is ripped out and gone. It's basically two hoses one from each valve cover, Tee'd into one and dumped into the atmosphere. Couple pulls were made paying attention to the hose and no oil was seen exiting the hose.
With the old PCV system I saw some Oil misting at the back of the adapter place from time to time when on the dyno so I know the crankcase was under some serious pressure and oil was being injested by the engine.

Yup yup. Not saying that anyone who does this will see these kind of results but wanted to share some info. There's a lot of factors that come into play. It was done on the same dyno thought, but again like you mentioned chase there's always other factors to consider.