RomRaider

Hey everyone,

I've been lurking for a while reading and tuning and logging and such...and here I am with some questions.

I'm using ver5p5a_public, I was logging to try and see why the Manifold Relative Sea Level Pressure maxed out at 7psi, and the Analog boost gauge read 11 psi max.

Also, I was trying to figure out if I had some of problem with the tune and that I wasn't hitting the boost it should.

My highest value in my target boost table is 1.813 (stock '07 WRX) which if I understand right should be 12psi (11.95 actually) and I'm wondering why the Datalog says I'm only hitting 7 while my analog gauge is clearly reading 11-12psi max

I was attempting to use Airboy's spreadsheet to make adjustment to my WGDC to make my Actual Boost (PsiG) accurate to what my datalogs were saying, UNLESS I'm logging the wrong parameter in which case stop me there and let me know

Regardless, I was under the impression that the "Boost and WG Interpolation" Tab and the "WG_limits 32b" tab's were there to help you make corrections to the WGDC table to make your Target Boost the same as your Actual Boost (Manifold Relative Sea Level Pressure (2-byte))

I suppose I don't understand the description on the Info page of "calculates boost targets and WGDC limits based on Throttle Opening and RPM, with IAT and Atmospheric pressure compensations applied"

Here are the Parameters I am logging:
Engine Speed (rpm)
Throttle Plate Opening Angle (2-byte)** (%)
Engine Load (2-byte)** (g/rev)
Manifold Relative Sea Level Pressure (2-byte)** (psi relative sea level)
Primary Wastegate Duty Maximum* (2-byte)** (%)
Primary Wastegate Duty Cycle (%)
Target Boost (2-byte)** (psi relative sea level)
Turbo Dynamics Integral (2-byte)** (absolute %)
Turbo Dynamics Proportional (2-byte)** (absolute %)


If I am completely misunderstanding the purpose/use of the spreadsheet please somebody educate me as to it's real reason and/or how to use it correctly.

I will include the log I was using with the spreadsheet.

And also, can someone tell me why my Target boost on my Datalog says 6.11, 6.5, 6.61 @ 3600'ish RPM while my Target Boost Table on my ROM is "1.813" which if I am correct in reading it as Absolute...and Bar's, the math to convert to Psi would be this...

1.813 * 14.7 = 26.65 psiA then -14.7 (assuming I were to be at sea level) = 11.95psi (psiG)

and 11-12psiG is what I see on my analog....why does my Target Boost read 6.11?? and not 11-12 or even 1.813bar?

Thanks so much for any help anyone can render, and if anyone who clearly has a better understanding of how the spreadsheet operates or what the individual tabs are actually used for, I would greatly appreciate it. I'm sure its a wonderful tuning assisting tool I simply dont understand how to utilize it.

- Dave

Are you at sea level?

I am not at Sea Level, I at 7200 ft.

The elevation is why the logged parameters looks "off". Use Manifold Relative Pressure Corrected instead.

The barometric pressure at 7200' is ~11.2psi, vs 14.7psi at sea level.

I'll give that a shot, Thank you.

One can assume that whatever readings the log says is that value + 3.5psi