Initial S-AFC settings for High/Low- 2g

[spyderturbo007]

Looks good, turn up the boost. The ECU is seeing 1.53g/rev at 6796 rpm and shooting for a timing advance of 23 degrees and an AFR of 9.6:1.

Actual airflow is 29.41lbs/min or 1.96g/rev. Time to crank down on the MBC.

 

[CanadianTSi]

Next time Log RPM, Timing, and front o2.

 

[kmoore]

Next time Log RPM, Timing, and front o2.

Yeah, I did a real quick log and didn't even think about the parameters (or whatever there called). I will log RPM, Timing, and front O2. You want me to log airflow?

 

[wimploki]

Set it up to 14 or 15 psi and log RPM, Timing, and Front O2. Make sure to be on the lookout for dips in your timing curve. If your timing drops, that means your knocking.

So far your posted log is looking good.

 

[2gGSX]

Log airflow as well.

 

[kmoore]

Log airflow as well.

Will do. Now only if it would stop raining....

 

[joe]

and I would recommend letting your car warm up before doing any pulls. looks like you coolant temp was only @ 175 on the first log

 

[kmoore]

15psi:

Time..........RPM.......Timing.......Airflow.....Front O2

0.41......... 2252.0...... 30.0......... 1.13......... 0.82
0.8........... 2264.0...... 22.0......... 3.72......... 0.88
1.2........... 2392.0...... 27.0......... 3.93......... 0.84
1.6........... 2492.0...... 26.0......... 4.51......... 0.9
2.0........... 2620.0...... 26.0......... 5.17......... 0.92
2.4........... 2764.0...... 22.0......... 5.97......... 0.92
2.8........... 2908.0...... 20.0......... 7.08......... 0.92
3.19......... 3080.0...... 16.0......... 8.36......... 0.94
3.6........... 3276.0...... 13.0......... 10.36....... 0.94
4.0........... 3516.0...... 9.0........... 12.32....... 0.96
4.41......... 3676.0...... 10.0......... 13.08....... 0.96
4.8........... 3888.0...... 11.0......... 13.9......... 0.96
5.2........... 4100.0...... 10.0......... 14.58....... 0.94
5.6........... 4312.0...... 11.0......... 15.48....... 0.94
5.99......... 4504.0...... 11.0......... 16.67....... 0.94
6.39......... 4716.0...... 11.0......... 17.86....... 0.94
6.79......... 4940.0...... 13.0......... 18.35....... 0.74
7.46......... 5264.0...... 13.0......... 19.4......... 0.18
7.86......... 5452.0...... 14.0......... 20.43....... 0.06
8.26......... 5636.0...... 16.0......... 20.66....... 0.04
8.66......... 5808.0...... 17.0......... 20.82....... 0.02
9.06......... 6008.0...... 19.0......... 21.22....... 0.02
9.47......... 6180.0...... 20.0......... 21.74....... 0.02
9.87......... 6324.0...... 20.0......... 22.05....... 0.0
10.26....... 6484.0...... 21.0......... 22.2......... 0.0
10.67....... 6640.0...... 22.0......... 22.23....... 0.0


I know there has got to be something wrong with my front O2. I just don't know what's wrong with it. How does everything else look? I think I might have a little knock at 4100?

Edit: And should I not be flowing more?

 

[wimploki]

There's definitely something up with your O2 reading by 4940rpm and up. When was the last time you replaced your o2 sensor? Yes, there knock at 4100 rpm range. Richen it up a notch on your safc 4100 setting.

I would also consider logging TPS on your next pull.

15psi:

Time..........RPM.......Timing.......Airflow.....Front O2

0.41......... 2252.0...... 30.0......... 1.13......... 0.82
0.8........... 2264.0...... 22.0......... 3.72......... 0.88
1.2........... 2392.0...... 27.0......... 3.93......... 0.84
1.6........... 2492.0...... 26.0......... 4.51......... 0.9
2.0........... 2620.0...... 26.0......... 5.17......... 0.92
2.4........... 2764.0...... 22.0......... 5.97......... 0.92
2.8........... 2908.0...... 20.0......... 7.08......... 0.92
3.19......... 3080.0...... 16.0......... 8.36......... 0.94
3.6........... 3276.0...... 13.0......... 10.36....... 0.94
4.0........... 3516.0...... 9.0........... 12.32....... 0.96
4.41......... 3676.0...... 10.0......... 13.08....... 0.96
4.8........... 3888.0...... 11.0......... 13.9......... 0.96
5.2........... 4100.0...... 10.0......... 14.58....... 0.94
5.6........... 4312.0...... 11.0......... 15.48....... 0.94
5.99......... 4504.0...... 11.0......... 16.67....... 0.94
6.39......... 4716.0...... 11.0......... 17.86....... 0.94
6.79......... 4940.0...... 13.0......... 18.35....... 0.74
7.46......... 5264.0...... 13.0......... 19.4......... 0.18
7.86......... 5452.0...... 14.0......... 20.43....... 0.06
8.26......... 5636.0...... 16.0......... 20.66....... 0.04
8.66......... 5808.0...... 17.0......... 20.82....... 0.02
9.06......... 6008.0...... 19.0......... 21.22....... 0.02
9.47......... 6180.0...... 20.0......... 21.74....... 0.02
9.87......... 6324.0...... 20.0......... 22.05....... 0.0
10.26....... 6484.0...... 21.0......... 22.2......... 0.0
10.67....... 6640.0...... 22.0......... 22.23....... 0.0


I know there has got to be something wrong with my front O2. I just don't know what's wrong with it. How does everything else look? I think I might have a little knock at 4100?

Edit: And should I not be flowing more?

 

[kmoore]

There's definitely something up with your O2 reading by 4940rpm and up. When was the last time you replaced your o2 sensor? Yes, there knock at 4100 rpm range. Richen it up a notch on your safc 4100 setting.

I would also consider logging TPS on your next pull.

TPS is 100%. I don't see a need to log TPS when I already know that I am WOT at 98-100%.

What should I do about that O2 sensor? The sensor hasn't been changed since I got the car...

 

[wimploki]

When was the last time you've done maintenance on your ride? There's a section here on tuners regarding maintenance before upgrades or tuning. I think it's safe to say that you should consider replacing your o2 if money is not an issue for you.

Good luck

Update - Tech Guide: 2G 4G63t Upgrades - DSMtuners

 

[kmoore]

I know ALL about the maintenance and that tech guide. I am waiting for my car to turn over to 60k before I do a full maintenance check up. I'm just trying to figure out if this is something that I can fix or if it is manditory to replace it now.

 

[2gGSX]

Try replacing it with a known-good O2 sensor if you want to try that first. I know Chris has gone through at least 8 of them, so he might have one laying around?

Airflow does seem a little low though, with the correction factor calculated in you're getting 28 lbs/min. Get on AIM and ask Chris about those sensors.

 

[kmoore]

I'll ask him about it... Tom, you remember my 1st log that I posted a while back (on here) while I was still had the t-25 don't you? It had the same problem as now....

Let me ask you a question though. Knowing that I am getting a wideband in a few weeks, should I still replace the front O2? I'm assuming I would have to since the front O2 directly effects low throttle drivability.

 

[2gGSX]

Are your O2's cycling during closed loop? Are your fuel trims being updated? If yes to both then I suppose there isn't a pressing need, however you should still fix it ASAP as it could be a sign the O2 sensor is going out.

 

[spyderturbo007]

You're pushing 28.5lbs/min at 6640rpm. That sounds about right to me for setting the boost at 15 psi. That's assuming a -22% correction factor on the SAFC as you listed in a previous post.

 

[kmoore]

You're pushing 28.5lbs/min at 6640rpm. That sounds about right to me for setting the boost at 15 psi. That's assuming a -22% correction factor on the SAFC as you listed in a previous post.

Yes. -22 across the board.

And I will post a log in closed loop. I am, for the most part, 100% sure that the O2 is cycling and Tom what do you mean by if my fuel trims are being updated?

 

[steve]

If the low throttle settings from post 64 are accurate then the O2 sensor reading from open loop would imply that he's going very lean after 4k. I don't often see O2 sensors that work at low RPM and not at higher ones. It's usually the other way around.

That would make me wonder if there wasn't a problem with the fuel pump or the FPR tracking manifold pressure.

 

[2gGSX]

Yes. -22 across the board.

And I will post a log in closed loop. I am, for the most part, 100% sure that the O2 is cycling and Tom what do you mean by if my fuel trims are being updated?

If your O2 sensor dies it will set off a DTC and lock you into open loop--thus the fuel trims will no longer be updated.

If the low throttle settings from post 64 are accurate then the O2 sensor reading from open loop would imply that he's going very lean after 4k. I don't often see O2 sensors that work at low RPM and not at higher ones. It's usually the other way around.

That would make me wonder if there wasn't a problem with the fuel pump or the FPR tracking manifold pressure.

I don't believe the O2 sensor is reading correctly. At 0.5V it's supposed to be 14.7:1, and be very accurate at detecting that. He would be running so absurdly lean that you would be guaranteed knock or actual detonation, which the ECU did not detect any. If it were simply a fuel pump/FPR issue then he would be seeing real knock (timing pulled).

 

[steve]

I don't believe the O2 sensor is reading correctly.

Let hope that's the case. I was just pointing out the fact that both his initial tuning and his pulls show O2 issues above 4k that should be looked into quickly. If the sensor isn't bad what's your next thought.

 

[kmoore]

Here's the log just cruising in 4th gear about 2k rpm:

Time........Coolant.......RPM.........TPS........02 1Bank1
0.4........... 196.0....... 2216.0...... 7.07......... 0.08
0.79......... 196.0....... 2220.0...... 7.07......... 0.06
1.45......... 196.0....... 2232.0...... 8.25......... 0.46
1.86......... 196.0....... 2248.0...... 9.04......... 0.84
2.79......... 192.0....... 2268.0...... 9.43......... 0.74
3.19......... 196.0....... 2284.0...... 9.43......... 0.34
3.6........... 192.0....... 2300.0...... 9.82......... 0.74
3.99......... 192.0....... 2320.0...... 9.82......... 0.14
4.39......... 192.0....... 2328.0...... 10.22....... 0.82
4.79......... 192.0....... 2348.0...... 10.22....... 0.44
5.18......... 192.0....... 2364.0...... 9.82......... 0.72
5.59......... 192.0....... 2376.0...... 8.64......... 0.08
5.98......... 192.0....... 2372.0...... 7.07......... 0.2
6.38......... 192.0....... 2400.0...... 2.75......... 0.0
6.77......... 192.0....... 2344.0...... 2.75......... 0.0
7.18......... 192.0....... 2348.0...... 2.36......... 0.0
7.58......... 192.0....... 2328.0...... 2.75......... 0.0
7.97......... 192.0....... 2308.0...... 2.75......... 0.0
8.67......... 192.0....... 2292.0...... 2.75......... 0.0
8.77......... 192.0....... 2280.0...... 5.89......... 0.0
9.17......... 192.0....... 2256.0...... 10.22....... 0.86
9.57......... 192.0....... 2276.0...... 11.0......... 0.7
9.97......... 192.0....... 2288.0...... 12.18....... 0.82
10.36....... 192.0....... 2292.0...... 12.97....... 0.88
10.77....... 192.0....... 2296.0...... 13.36....... 0.04
11.7......... 192.0....... 2308.0...... 14.15....... 0.76
12.1......... 192.0....... 2324.0...... 14.15....... 0.34
12.5......... 190.0....... 2332.0...... 14.54....... 0.84
13.17....... 190.0....... 2344.0...... 14.93....... 0.1
13.57....... 190.0....... 2364.0...... 14.93....... 0.66
13.96....... 190.0....... 2380.0...... 14.93....... 0.82
14.63....... 190.0....... 2404.0...... 15.72....... 0.7
15.3......... 190.0....... 2416.0...... 15.72....... 0.5
15.7......... 190.0....... 2440.0...... 15.72....... 0.8
16.1......... 190.0....... 2456.0...... 15.72....... 0.08
16.5......... 190.0....... 2472.0...... 15.72....... 0.6
16.9......... 190.0....... 2476.0...... 15.72....... 0.8
17.29....... 190.0....... 2496.0...... 15.72....... 0.12
18.49....... 190.0....... 2508.0...... 15.72....... 0.5
19.16....... 190.0....... 2564.0...... 27.5......... 0.82
19.57....... 190.0....... 2620.0...... 31.04....... 0.56
19.96....... 190.0....... 2652.0...... 32.61....... 0.84
20.35....... 190.0....... 2692.0...... 33.01....... 0.34
20.76....... 190.0....... 2736.0...... 33.01....... 0.68
21.15....... 190.0....... 2784.0...... 33.01....... 0.72
21.56....... 190.0....... 2828.0...... 33.01....... 0.8
21.95....... 190.0....... 2880.0...... 33.01....... 0.1
22.34....... 190.0....... 2936.0...... 35.76....... 0.7
22.75....... 190.0....... 2988.0...... 36.15....... 0.82
23.14....... 190.0....... 3032.0...... 36.15....... 0.58
23.55....... 190.0....... 3112.0...... 33.4......... 0.76
23.94....... 190.0....... 3152.0...... 31.43....... 0.3
24.34....... 190.0....... 3224.0...... 30.26....... 0.08
24.74....... 190.0....... 3268.0...... 2.36......... 0.92
25.13....... 190.0....... 3232.0...... 2.36......... 0.8
25.54....... 190.0....... 3204.0...... 2.36......... 0.68
25.93....... 190.0....... 3176.0...... 2.36......... 0.0
26.32....... 190.0....... 3120.0...... 2.36......... 0.0
26.73....... 190.0....... 3076.0...... 2.36......... 0.0
27.12....... 190.0....... 3032.0...... 2.36......... 0.0
27.53....... 190.0....... 2992.0...... 2.36......... 0.0
27.92....... 190.0....... 2948.0...... 2.36......... 0.0
28.32....... 190.0....... 2904.0...... 2.36......... 0.0
28.72....... 190.0....... 2836.0...... 2.36......... 0.0
29.11....... 190.0....... 2760.0...... 2.36......... 0.0
29.51....... 190.0....... 2680.0...... 2.36......... 0.0
29.91....... 190.0....... 2604.0...... 2.36......... 0.0
30.3......... 190.0....... 2548.0...... 2.36......... 0.0
30.71....... 190.0....... 2504.0...... 9.04......... 0.0
31.1......... 190.0....... 2448.0...... 11.0......... 0.82
31.51....... 190.0....... 2460.0...... 11.39....... 0.82
31.9......... 190.0....... 2452.0...... 12.97....... 0.84
32.29....... 190.0....... 2440.0...... 14.54....... 0.08
32.96....... 190.0....... 2432.0...... 14.54....... 0.16
33.36....... 190.0....... 2436.0...... 14.93....... 0.72
33.76....... 190.0....... 2432.0...... 15.72....... 0.22
34.16....... 190.0....... 2436.0...... 15.72....... 0.66
34.56....... 190.0....... 2436.0...... 15.72....... 0.48
34.95....... 190.0....... 2448.0...... 16.11....... 0.14

PS: If anybody can tell me why the page
got a lot wider because I posted this log, and how
I can fix it, that would be great also.

Edit: I just did it manually. That page setup was driving me crazy.

 

[2gGSX]

This page formatting is really annoying!

I'm assuming in the log where it reads 2.36% TPS you're off the throttle. If that's the situation then it's oscillating correctly.

Since the sensor apparently isn't bad, my next thought is that the O2 sensor circuit is losing power somehow at higher loads. Check the connection from the ECU to the O2 sensor harness in the engine bay--perhaps there's a frayed wire. While you're there, you could pull the ECU and check for any damage there. These are all only possibilities so don't get freaked out.

Would it be possible to get a log in 1st or 2nd gear where you slowly get up to ~6000 RPM? Staying in closed loop would be ideal but I don't think that's possible. Either way post up the results and see if the O2 sensor behaves the same way. If you need a second set of hands give me an IM or call.

 

[kmoore]

Well, I guess that's good news because a new sensor is like 100 bucks! Chris said that he didn't have an extra sensor either.

I will do a 1st gear and a 2nd gear log up to 6k keeping it in closed loop. Is there anything you would like me to log also, while I'm at it?

And yes, the 2.36 TPS reading is off the throttle.

 

[kmoore]

Here is another logger requested by Tom (2gGSX). In neutral reved up to what I thought was 6krpm. Trying to stay in closed loop.

Time.........RPM.......TIMING........TPS.........O2 1Bank1

0.41......... 772.0....... 7.0........... 2.36......... 0.54
0.79......... 784.0....... 7.0........... 2.36......... 0.58
1.19......... 784.0....... 7.0........... 2.36......... 0.1
1.86......... 796.0....... 4.0........... 2.36......... 0.58
2.25......... 1004.0...... 8.0........... 3.93......... 0.08
2.65......... 1300.0...... 11.0......... 4.32......... 0.68
3.05......... 1740.0...... 19.0......... 8.25......... 0.06
3.45......... 2264.0...... 28.0......... 8.25......... 0.86
3.84......... 2436.0...... 32.0......... 8.25......... 0.86
4.23......... 2516.0...... 33.0......... 8.25......... 0.14
4.89......... 2656.0...... 34.0......... 9.04......... 0.7
5.29......... 2748.0...... 34.0......... 9.43......... 0.1
5.69......... 2900.0...... 34.0......... 10.22....... 0.84
6.08......... 3080.0...... 34.0......... 11.0......... 0.86
6.49......... 3288.0...... 34.0......... 11.79....... 0.08
6.88......... 3520.0...... 34.0......... 12.18....... 0.1
7.27......... 3788.0...... 34.0......... 13.36....... 0.78
7.67......... 4028.0...... 34.0......... 14.15....... 0.48
8.07......... 4268.0...... 34.0......... 14.93....... 0.92
8.47......... 4660.0...... 35.0......... 17.29....... 0.94
8.86......... 4904.0...... 35.0......... 17.29....... 0.9

 

[kmoore]

Update:

Well yesterday I received my AEM UEGO wideband and went ahead and installed it.

Upon start up it seems to sit right at about 14.6 (bounces a little) at idle, which I believe is stoich. While cruising, it also bounces around 14.6. In between shifts though, it reads 10.0 all the way rich, which I also believe is normal (my BOV IS recirculated).

Although, whenever I go wide open throttle, the gauge will go all the way rich 10.0.

So, now that I do have the wideband, should tune for a specific AFR? Or should I continue to look at the timing curve while also concentrating on the AFR? What should be my next move?

According to my logs, should I up the boost and do another log? Thanks a lot