607motorsports

iTrader: (6)

I've been playing around with this for awhile and can't seem to get it to work.

I am running a 2bar SD tune on my car (2002 SS) and would like to be able to log and build histograms using a PID that will read boost in PSI and not KPA.

For some reason I cannot seem to get this to work no matter what I try. I've tried using the [PID.11-14.7] setup and that does not work. I also heard that you could use the ([PID.2333-101.3])/6.9 but I do not have a PID.2333 in my HPTuners 2.23 beta for some reason?

Any advice would be greatly appreciated! Thanks ahead

foff667

iTrader: (2)

Are you able to post a scanner log?

607motorsports

iTrader: (6)

Do you want the actual config file or just a log? I should be able to send you both to take a look at if you would like.

I've tried everything I've found on the HPTuners forums to get this to work but still haven't had any success so I figured maybe some of the LS specific people on here might be able to lend some advice.

foff667

iTrader: (2)

Just the log should be enough.

607motorsports

iTrader: (6)

Here's a cruising log I grabbed tonight...

bad6as

iTrader: (17)

Been looking for a answer for a while. I just log kpa and convert to psi on a spread sheet I have

607motorsports

iTrader: (6)

That's what I do as well but it would just be so much easier if I could figure out how to create a PID that would just read PSI.

The1N_only

iTrader: (7)

[PID.11.PSI]-14.7 is what I use and it works. I have the latest Beta

Atomic

iTrader: (37)

I think my 2bar pid is 2333, so its [pid.2333.psi]-14.7

If you read the bottom part of the pid list, you can declare the variable to output in any units you want.

Similarly, ([pid.2333]-101)/(101/14.7) will work as well to display in psi

607motorsports

iTrader: (6)

For some reason I do not have PID.2333 listed in my list. I will give the PID.11.PSI a shot and see if it works.

soundengineer

iTrader: (16)

instead of Using PID#### which are unique to each vehicle type...
try using the sensors instead

also use IMP or MET for units within the custom PID that you make

[SENS.30.IMP]-14.503

notice... 14.503...NOT 14.7
14.7 is incorrect...

Atomic

iTrader: (37)

Depends on your altitude...standard sea level is defined as 101325pa, which is 14.696psi.

soundengineer

iTrader: (16)

only if you are talking atmospheres,,, not relative pressure
1 atmosphere is 14.69 psi
1 atmosphere is 1.01325 Bar
1 atmosphere is 101.325 kpa

your vehicle resets atmosphere to 100 kpa everytime you turn on your key
which means that it doesnt care that sea level is 14.69

all it cares is 100 kpa is atmosphereric 0 wherever you are are at

100 kpa converted to psi is 14.503

its always 14.503 per 100 kpa...ALWAYS...

Atomic

iTrader: (37)

Interesting, I didnt know the pcm reset it each time. When I set up my 3bar I set the slope and offset so it called 101kpa atmospheric. The same can be done with a 2bar, but not the factory setup since you dont have map sensor control. Even so, some might say 0.2psi is splitting hairs

gectek

iTrader: (2)

The PCM doesnt reset. The Map sensor takes a quick shot of outside air every key start, which is how it can show 90kps one day and 102 the next. It does not just go to 100kpa for the hell of it.....

soundengineer

iTrader: (16)

it always did in my car....
turn on key.. it reads 100...
Baro reset procedure..every time the key is turned on

gectek

iTrader: (2)

I can turn a car on here and it will fluctuate from 99 on a given day to about 102 on another day. In another town in my state, one day it showed 87 kpa. The guy I was talking to measured 4 vehicles with his scanner, they all showed the same.

I would def research anything you say with such certainty because saying that it happens every time no matter what is a pretty concrete statement.

Otherwise when you are tuning, you would be chasing your tail wondering why you are only seeing 95 Kpa on a nasty combo instead of your theoretical 100 every time.

If the computer system were that dumb, it would run like crap in alot of conditions and be no smarter than a normal carb.

soundengineer

iTrader: (16)

also.. if your MAP sensor read 90kpa at key on.. you have a problem with your sensor...
that would be 26.58 InHg...which we just dont see in the US..

97kpa~103kpa...maybe...on the extreme ends

gectek

iTrader: (2)

Well then there is something wrong alot of the time. Barometric pressure is not steady all the time.

You do realize that when you see any baro reading on the news or published that it is corrected to sealevel right?

soundengineer

iTrader: (16)

theoretical relative 100kp is atmosphere with No Vacuum...
once your engine makes vacuum....you start to see less...
if you see 95kpa... then it means you have a restriction somewhere that makes 5kpa worth of vacuum at WOT.... meaning your engine is trying to pull in more air then it can get thru our shitty little openings

I'm 100% positive my 2001 Fbody was 100kpa every time I turned the key to the on position...