After recording a few scans I noticed that the tables and gauges are displaying the intake pressure incorrectly. At idle HPT is showing 5-6psi and at full boost (23psi on the cars DIC) the playback shows over 30psi. AS far as I can tell, everything else is correct.
Any ideas?
Are you looking at the map sensor readout? Subtract 14.5 from that to get boost smaponbob
In "gauge" display is pre-configured as is the graph. I'll look at it again and post here.
Okay, I am looking at a scan record of my Redline. I have the MAP set to psi on both the Gauge and Chart displays. At idle (812 rpm the MPA is showing 5.22 psi on both. At 6600rpm, TPS 81%, MAF 32.89 lb/min, boost is showing 32.05 psi !!!! I don't think so!! Ideas?
Subtract 14.5 from the map readings, the map sensor reads 14.5psi atmospheric pressure + boost.
Subtract 14.5 from the map readings, the map sensor reads atmospheric pressure(14.5psi) plus boost as stated by shabby twice now
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
The first time he simply said to subtract 14.5. It did not dawn on me WHY. With his second subtraction he DID explain why, as did you, and now I get it. So, I guess I wonder why it is displayed that way. Just curious.
I was looking at the custom PID posted by 405hp z06 to read the boost by its self but no matter how I try to do it it just will not come out right. So I give up on it lol.
Convert MAP to Boost Pressure -
Formula: (MAP Sensor - BARO) / 6.894757
Name: Boost
Abbrv: Bst
Sensor: none selected
Units: psi
Function: ([SENS.30.MET] - [PID.2340.MET]) / 6.894757
I have tried everything from that exact formula to just having the map sensor subtract the baro and still cant get it right.
Thats what i did and it works, the help section of vcm scanner comes in handy.Originally Posted by jwhitten
MAP = Manifold Absolute Pressure
Boost is usually quoted relative to atmospheric pressure, which is 14.5psi absolute.
I count sheep in hex...
14.5038 to be exact.....
-Scott -
I am starting to feel like a 95 year old man in a rest home being shown Blackberry for the first time and being told to go ahead and text his kids.
In attempting to to create a PID, I run into a road block. I am looking at the demo about creating a Custom PID. The very first instruction is to "Click the Histogram Display button". The response to that is that the Histogram Display opens but the first sentence is "The Histogram is not Supported with the current loaded parameters". So, do I have to be hooked up to the car in question?
Last edited by snaponbob; 03-03-2009 at 09:16 AM.
No
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
Bill, could you help a bit further? Before the question you answered I had stated "The very first instruction is to "Click the Histogram Display button". The response to that is that the Histogram Display opens but the first sentence is "The Histogram is not Supported with the current loaded parameters". What am I missing here?
Don't worry about the histogram, you aren't making a histogram, all you're trying to do right now is create a custom pid.
The reason the histogram says unsupported is because you probably haven't customized it for your application but thats neither here nor there & ultimately has no reflection on a custom pid.
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
right click the table display and select insert PID
then click on User Defined PID's
and configure user defined
Name it what you want
Leave Sensor Blank or select psi
Leave Units blank
[sens.30.psi]-14.5038
Last edited by S2H; 03-03-2009 at 10:37 AM.
-Scott -
Hmmm !!!!!!!!!!!!!!!!!! Already tried that and it didn't work. Now? POOF -- magic !!!!!!!!!!!!!!!!!! A window pops up. WTF. Oh well, I don't care HOW I get there, I just want to get there!
(pause)
After some minor fumbling around, I have the Charts and Gauges set up the way I want it. Thank you very much.
Yeah I now what the help section is and I have tried to get that one to work to I am just PID illiterate lol, is there a way to get it to read both boost and vaccum? or is there another PID that you can make to read vaccum?Thats what i did and it works, the help section of vcm scanner comes in handy.
Last edited by jwhitten; 03-03-2009 at 01:21 PM.
to read vacuum...do the entire thing *(0-1)
or tell it -1*(formula)
vacuum is oposite of boost
unfortunately I dont think we can do complex if then statements in the scanner yet...LOL
Last edited by S2H; 03-03-2009 at 01:39 PM.
-Scott -
So do ([sens.30.psi]-14.5038)*(0-1)?
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