i was just wondering what the PRS (im guessing pressure) reading is on yours when you not on the gas mine is reading -750ish and at full throttle its +0.15 i have a ls so is this normal? could that be a indication of my compression reading all added up? just wondering. sorry if its a dumb question

 

I believe that would be manifold preasure... a la map sensor

 

if i remember correctly when i was n/a they were in the low 700's and around 0.00 when under WOT

 

is it maniflod pressure? and are they good #'s

 

yes manifold pressure. You should not be showing anything in the positive unless you are boosting past the map sensor. My readings were always like -560 at idle and -5 to sometimes exactly 0 at full throttle.

 

yeah that's what mines at too.

 

Alright, where are you hiding the turbo?

 

i have everything set up right and it goes+0.17 sometimes even to +0.30 what does that mean? how am i getting positive pressure? and is that good or bad?

 

Yes. It's possible for normally aspirated cars to attain positive manifold pressure. It's due in part to manifold and intake pipe resonances that "supercharge" the manifold.

 

so its good?

 

If you did the initialization with any accessories(dome lights,fan,stereo,etc) running, then the voltage values could have been stored differently than when your car is running and the alternator is pumping out juice.

I had the same problem, but was only positive by like .5 and when at WOT my throttle percentage was only showing like 97%...

I bought a new battery... turned off car and all accessories after a warmup and then re-initialized the VAFC(2) and it was all normal again.

Could be different with your setup though.

 

it was set up correctly and for wot it says 100% im jsut wondering where the positive is comin from. and when i had my car turbo'd i still have my boost guage in and it goes positive a lil there also? whats goin on here?

 

Is it an OEM map sensor and has has it been relocated at all from your turbo set up? This may have something to do with it. What ECU are you using, is it an aftermarket throttle body? Do you have the pressure wires from the VAFC hooked up on the correct place on the ECU harness. More specifically you will have one wire that needs to higher than the other from the VAFC to the corresponding wire on the ECU.

 

no nothing was relocated and i have the oem throttle body. im pretty sure i connected everything right i wennt out today and double checked. (i installed it this past summer) i im just clueless