07 sti rom analysis

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

I'm going to need more information. Is it cutting WGD for sure? Use the latest logger def update and log the following:
rpm, mass air flow (volts), mass air flow (g/s), primary wgd, turbo dynamics integral, turbo dynamics prop, target boost, throttle opening angle %, ignition timing, knock correction, timing advance, feedback correction and fine correction learning.

gabedude · **Posted:** Wed May 02, 2007 3:25 pm

merchgod wrote:

I'm going to need more information. Is it cutting WGD for sure? Use the latest logger def update and log the following:
rpm, mass air flow (volts), mass air flow (g/s), primary wgd, turbo dynamics integral, turbo dynamics prop, target boost, throttle opening angle %, ignition timing, knock correction, timing advance, feedback correction and fine correction learning.

Will do at lunchtime.

-Gabe

gabedude · **Posted:** Wed May 02, 2007 5:23 pm

Got em. 4.5 volt max. He was right.

-Gabe

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

I don't see anything unusual for wgd based on the stock map. The only thing I see is that it appears maf is pegged at 4.5 volts but it doesn't look like it is pulling wastegate duty to limit airflow.

gabedude · **Posted:** Wed May 02, 2007 8:10 pm

Perhaps it is just hard to see with the stock mapping? I have logged a MAX of 271 G/S in all of my logs and the next cell past 4.49v (260.96 G/S) calls for a value of 4.57v (276.43 G/S). It oscilates around 4.5v for 1000 rpm. :confused: Perhaps I should log manifold pressure (relative) as well?

-Gabe

Code:

Engine Speed (rpm)   Mass Air Flow Sensor Voltage (V)   Mass Air Flow (g/s)   Primary Wastegate Duty Cycle (%)   Turbo Dynamics Integral Cumulative (absolute %)   Turbo Dynamics Proportional (absolute %)   Target Boost (psi relative sea level)   Throttle Opening Angle (%)   Ignition Timing (degrees)   Knock Correction (degrees)   Timing Advance (degrees)
3803   4.02   171.72   39.22   1.37   -3.77   13.71   100   12   3.95   3.95
3983   4   178.26   40.78   -2.73   -1.49   13.97   100   13.5   3.75   3.73
4184   4.1   188.47   38.04   -5.37   -1.57   14.02   100   13   3.3   3.31
4421   4.14   197.2   37.25   -7.27   -0.58   14.02   100   13   2.85   2.84
4602   4.18   200.12   36.08   -8.16   -0.5   13.83   100   14.5   2.82   2.83
4842   4.26   214.42   35.29   -9.15   -0.41   13.55   100   16   2.95   2.89
5031   4.3   221.41   36.08   -9.55   -0.11   13.55   100   17.5   3.22   3.18
5223   4.32   231.23   37.25   -9.67   -0.11   13.55   100   19   3.51   3.51
5429   4.38   242.95   38.43   -9.8   -0.04   13.55   100   19   3.41   3.41
5578   4.42   249.53   39.22   -10   -0.05   13.55   100   19.5   3.42   3.38
5760   4.46   253.63   40.39   -10.07   0.13   13.55   100   20.5   3.23   3.21
5938   4.48   256.33   41.18   -9.75   0.27   13.55   100   21.5   3.04   3
6060   4.5   256.97   41.18   -9.71   0.06   13.43   100   22.5   3.24   3.25
6213   4.5   261.44   41.18   -9.64   0.08   13.3   100   24   3.31   3.32
6358   4.5   261.92   41.18   -9.33   -0.02   13.08   100   25.5   3.19   3.19
6551   4.48   259.05   40   -9.21   0.02   12.86   100   26.5   3.22   3.23
6651   4.48   260.49   36.08   -9.58   -0.24   12.34   100   27.5   2.99   2.96
6776   4.46   261.13   31.37   -10.36   -0.61   11.68   100   29   2.63   2.61
6946   4.48   251.07   31.37   -10.54   0.1   11.68   100   29.5   2.22   2.21
7070   4.5   257.44   31.76   -10.14   0.15   11.68   100   30   2.17   2.16
7200   4.48   258.1   32.16   -10.02   0.15   11.68   100   30.5   2.02   2.02

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

It is hard to tell as you are hitting 4.5v right when boost is already tapering off. I do not see any limit in the code for mafv - it should read up to nearly 5 volts. I also do not see any threshold for mafv anywhere near 4.5v where a change in logic might occur. Could be based on airflow or load, though.

gabedude · **Posted:** Wed May 02, 2007 8:36 pm

merchgod wrote:

It is hard to tell as you are hitting 4.5v right when boost is already tapering off. I do not see any limit in the code for mafv - it should read up to nearly 5 volts. I also do not see any threshold for mafv anywhere near 4.5v where a change in logic might occur. Could be based on airflow or load, though.

Perhaps MAFv just does not log past 4.5v.

Ahh well, I guess we will have to wait until my WB is installed and I up the boost some to actually see if I hit a real limit. (unless ImprezaRSX wants to post up some logs of the problem he is seeing).

How about the funky timing stuff then, the power dip I saw this morning was due to that I think (the funky interaction between the timing maps and advance maps).

-Gabe

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

gabedude wrote:

Perhaps MAFv just does not log past 4.5v.

No, I checked that too. It will log up to a little over 5 volts. Maybe the MAF sensor is different on the 07 stis?

gabedude · **Posted:** Wed May 02, 2007 8:47 pm

merchgod wrote:

gabedude wrote:

Perhaps MAFv just does not log past 4.5v.

No, I checked that too. It will log up to a little over 5 volts. Maybe the MAF sensor is different on the 07 stis?

Well, lets table it unless ImprezaRSX can post up some logs that show the problem. Whenever you are ready to give me some test defs for figuring out the timing, let me know.

-Gabe

ev8siv3 · **Joined:** Fri Mar 24, 2006 7:14 pm **Posts:** 768

FWIW I max out my MAF around 4.54v with the VF39. I'll have to check the '07 I've been working with to see what he's hitting on Stage 2.

EDIT--

I've also been hitting around 285g/s with the dialed in MAF at that range as well. I think the flow is just maxing out around that area usually 4.48-4.54 is towards redline.

gabedude · **Posted:** Thu May 03, 2007 3:06 am

We will see if it is a real problem soon enough.

gabedude · **Posted:** Thu May 03, 2007 3:08 am

ev8siv3 wrote:

EDIT--

I've also been hitting around 285g/s with the dialed in MAF at that range as well. I think the flow is just maxing out around that area usually 4.48-4.54 is towards redline.

Is this on the 07STI or your 06 Wagon?

ImprezaRSX · **Joined:** Tue Jul 25, 2006 8:47 pm **Posts:** 145

I'll get you some logs later on.
I'm on the work computer.

I have had two 07's on the dyno. Both have boost targets higher than achieved. Both have a max wdc higher than what is used.
One is running more boost than the other due to different exhaust restrictions.

In the boost curves on one, the boost is tapering, but at 4.5volts, the wdc is lowered even faster and boost falls off faster.

The ecu isn't trying to hit target boost once the 4.5v is hit.

However, I know one of the maps is 3d. So it could be a scaled maf limit based on rpm and load or tps.

I would like to throw a big MAF housing on one to see if it does the same thing.

I tried to outsmart it by puting an IR solenoid on the car to control boost.
It took ONE Run, the car went over the MAF limit once and hit 20.5 psi at like 4800rpm. Then the ecu learned the new solenoid better and the next two runs I didn't get past that point again.

This doesn't help too much, but you can see there are two different rates of boost taper. One before 4.5v and one after.

ImprezaRSX · **Joined:** Tue Jul 25, 2006 8:47 pm **Posts:** 145

merchgod wrote:

It is hard to tell as you are hitting 4.5v right when boost is already tapering off. I do not see any limit in the code for mafv - it should read up to nearly 5 volts. I also do not see any threshold for mafv anywhere near 4.5v where a change in logic might occur. Could be based on airflow or load, though.

my flow limit was around 262 g/sec -ish. (4.5v on my cal) where it started cutting wdc.

desired torque map might have a more indirect path than what you are thinking.

Like, say:
x axis: throttle position
y axis: rpm
values are a percentage of a ceratain maf voltage or flow rate and the result is inputed into an equation that establishes a wdc change.
So it could be like a two or three step process and not just a cut and dry single map.

Or maybe it has a calculated torque like in your logger than it input into and equation for wdc modification.

I dunno.
I try to look at this code and only see a jumble of numbers. I have no clue how you guys pull stuff out of these roms.

Would like to learn...

ev8siv3 · **Joined:** Fri Mar 24, 2006 7:14 pm **Posts:** 768

gabedude wrote:

ev8siv3 wrote:

EDIT--

I've also been hitting around 285g/s with the dialed in MAF at that range as well. I think the flow is just maxing out around that area usually 4.48-4.54 is towards redline.

Is this on the 07STI or your 06 Wagon?

This is on my wagon. The 07STi is hitting about 270-280g/s.

RomRaider

07 sti rom analysis

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