I'll send it to Vipec tech support and post up what they say.

 

FWIW I get the same error on my VTS for v88 pnp.

 

you can just use positive pressure voltages though and I bet it would work out.

id still use the onboard sensor if possible

 

I believe it wants to cal in PSIA not PSIG. That is the issue. 0v should be 0psi or whatever the low side of the sensor is, then 5V would be 51.45psi as a MAP sensor reads in absolute pressure.

 

Well I think psia, positive pressures throughout, is going to be the answer, especially if the Cal tables work the same way on the v88. Thanks for checking that, I was wondering if that would be the case.
So I think it will come down to that they could make this more self-evident right in the user interface, and they could actually explain it with a real example with real numbers for a MAP sensor in the Help. Right-click "What's this?" takes you to the help for "Custom Sensor Calibrations" which does give an example for a wideband, where there is no possibility of negative numbers. They could add a MAP sensor example.
In the user interface, where you pick "Output Units" they could let you choose psia or psig. The only choice they give you is simply psi!
You are right of course that MAP is Manifold Absolute Pressure. But it can get confusing because of the error message and the green =-14.7 in the preview (green meaning it's gonna be ok). They tell you in several places that you should use MGP for the y axis on the fuel map. So my idea was to keep the MAP sensor calibration consistent with that, negative numbers for vacuum. But I guess that doesn't make any difference.

One further confusion for me is, I occasionally put a true gauge pressure sensor into my fuel regulator so I can log fuel pressure for a run or 2. It is a Honeywell MLH series 0 to 100 psig transducer that is vented to atmosphere so it always knows what the ambient atmospheric pressure is. 0.5 volts on that one means 0 gauge pressure, it won't measure vacuum. I would like that in my logs, I could set up that one to read 0 to 100 psig (for my fuel pressure) and set up the MAP sensor to read -14.7 to 35.3 psig (for my manifold pressure log). That way in my MAP log, neg numbers will be vacuum and + numbers will be boost. Will I be able to do that, with the MAP sensor calibrated 0 to 50?
I'm a little limited what I can try out on some of these things right now because I don't have the Vipec hardware yet - I'm trying to learn first, then buy.

BTW, the i88 doesn't have an internal MAP sensor. The i44 does. What the i88 has internally is a barometric pressure sensor, which they feed into the MGP calculation, continuously, I think. Maybe they all have that.

 

You can setup your axis with MGP (psi) and you can also log MGP (PSI), When set to MGP (psi) you will run negative PSI numbers in your axis table.

 

That would be cool if I could set up the MAP log to read MGP. I don't see where to make it do that though. I don't have any of my own logs of course. I only have the 2 sample logs that came with the software. And the base maps that came with it.

 

Its under PC logging. There is a option to log MGP and MGP(PSI)

Also if you hit X in the fuel table or timing table, you can change your axis to MGP (PSI) You will have to redo your scale.

 

I think I see it now.
In Logging, Setup Logging, PC Logging, the list of Logged Parameters has everything in it by default, including MGP and MAP.
Then, when I have a Log file open (.pcl file) I can right click in a blank area, pick new view, time plot, add parameter, pick MGP from the list, OK, and blammo there's my MGP log view added to the rest of them.

They look about right but I do see something fishy, making me wonder still:
Looking at a log showing views for MAP, MGP, and BAP (baro), one of the sample logs has a BAP of about 100.9 kpa, must be near sea level. In this log the difference between MAP and MGP is always 100, at every sample. I thought the difference between MAP and MGP should be equal to the BAP ~ 101 in this log.

Shouldn't MAP - MGP=BAP ?

 

Hey guys can I add a maf as an input with out using it for fuel and ignition calcs? It's a 02-07 Subaru denso maf. 0-5v..

Or am I stuck reading just the voltages off it?

 

any words about vipec pnp for evo now under umbrella linkecu?

now many pnp models deleted from vipec site and added to linkecu.

new "i" vipec's line named "g4+" in linkecu

 

I believe you are stuck using it as a 0-5V I have never looked into using a MAF with the ViPEC.

 

The link ECU is not the same thing. Its about 98% the same but it doesnt have all the ALL the features as the ViPEC, My understanding on it as of right now is they are working on getting the i-series out for everything. So everything that is listed on the site is what they have available right now. The other i series vipec's will be coming down the pipe soon.

 

Right on, I can make a cal table for it, it's only purpose is to determine what the airflow of fresh air is when decelerating. I'll be comparing airflow rates from my fresh air anti lag testing.

If it works, I'd like to be able I use it for control over that part of the system.

 

I have a G4+ Extreme waiting for my SparkTech CDI ignition kit and BBK-3B turbo to arrive, before it all goes in my IX. I've been running a G4 in my race 06 STI for years now, and I'm looking forward to playing with the OBD-II feature of the G4+ with my Evo. I'm also seriously considering a Cosworth Omega ICD dash for the Evo because it works with the G4+. We already installed both into a drift car, and I can tell you the Omega ICD is fantastic, especially with the full logging upgrades for motorsports use.