APS DR525 Results, Tuning, etc. - Page 9

mofoSTI · 01-04-2007, 03:20 PM

Wouldnt it suck if it came down to it that the issue really is just a loose ground wire. I have been picking my brain on this thread and have no other answer.

R4ND0M_AX3 · 01-04-2007, 04:12 PM

Quote:

Originally Posted by mofoSTI

Wouldnt it suck if it came down to it that the issue really is just a loose ground wire. I have been picking my brain on this thread and have no other answer.

I don't think it's that. Look at the chart. The uber rich situation occurs at the same time there is a bump in maf.

wait..... why is there a bump in the mafV right there?

**SCOOBYTRAP** · 01-04-2007, 04:19 PM

Quote:

Originally Posted by 04stiguy

Fourth gear.

Although its small, its interesting to note the small increase in MAF voltage at the exact point AFR goes rich. why would that be? Its also near wastegate opening, could this be from the restricter pill mod? I don't know, I'm just throwing some ideas out there... FWIW, it may be useful to run a higher resolution run concentrating on 3,400 to 4,000, there may be some useful data that is being missed. Just trying to keep the thoughts flowing...

04stiguy · 01-04-2007, 04:42 PM

Quote:

Originally Posted by SCOOBYTRAP

Although its small, its interesting to note the small increase in MAF voltage at the exact point AFR goes rich. why would that be? Its also near wastegate opening, could this be from the restricter pill mod? I don't know, I'm just throwing some ideas out there... FWIW, it may be useful to run a higher resolution run concentrating on 3,400 to 4,000, there may be some useful data that is being missed. Just trying to keep the thoughts flowing...

There is no restrictor pill mod on this car. Using a Tial 44mm EWG and Eboost2.

The MAF bump is also what I have been pondering for the last 18 hours. Possible compressor surge that is causing the MAF to blip voltage up for a sec.?

Also, Wolfplayer, I am wondering what kind of total timing values you have at the rich spot. Maybe a combo of:

>timing value too low
>accompanied by slightly rich condition set off by MAF "noise"
>which would lead to a light misfire and raw fuel in exhaust...

MAF bump could also be a function of the pipes/FMIC in the process pressurizing. When discharge tract stabilizes, so does MAF signal.

just thinking out loud..

R4ND0M_AX3 · 01-04-2007, 05:45 PM

The boost curve suddenly changes in that area too. 6-12psi takes about 400 rpm. 12-17 ish happens in 100 rpm. Maybe some sort of safety triggered of of a too aggressive boost curve. Just reaching here.

**SCOOBYTRAP** · 01-05-2007, 02:31 AM

...also how is the load calculated?

WolfPlayer · 01-05-2007, 05:22 AM

First, definitely not a grounding issue. I have a grounding kit that redistributes the grounds to various parts of the motor/body (and, yes, the manifold grounding wires are UNDER the FMIC tabs).

t

WolfPlayer · 01-05-2007, 05:59 AM

Here is a graph of the log I posted on page 3. I tried to use the same colors as the other graph posted above while graphing the same thing.

WolfPlayer · 01-05-2007, 06:07 AM

Regarding the MAF V spike, it is possible that this could happen because of the richness. Think about it. The car is building boost and starting to pull. All of a sudden a crazy amount of fuel gets injected into the motor. It's rather obvious to me that the car will slow down, MAF V will drop, load will drop, etc.

t

R4ND0M_AX3 · 01-05-2007, 08:54 AM

Quote:

Originally Posted by WolfPlayer

Regarding the MAF V spike, it is possible that this could happen because of the richness. Think about it. The car is building boost and starting to pull. All of a sudden a crazy amount of fuel gets injected into the motor. It's rather obvious to me that the car will slow down, MAF V will drop, load will drop, etc.

t

I see what you're saying. Rather than looking at it like an upward bump you are saying that it's just a sudden falloff because of power loosing richness. If the rich 'event' didn't happen the MAF would still have the same initial curve but it would be smoother after the peak.

WolfPlayer · 01-05-2007, 09:17 AM

Quote:

Originally Posted by R4ND0M_AX3

I see what you're saying. Rather than looking at it like an upward bump you are saying that it's just a sudden falloff because of power loosing richness. If the rich 'event' didn't happen the MAF would still have the same initial curve but it would be smoother after the peak.

Absolutely. This is something that you can clearly feel. So, there is definitely a loss in power at that point. The MAF V going downward - or simply maintaining instead of continuing the upward trend - seems to bear this out as one would expect.

All I know is that if I could maintain 11:1 then this car would be an animal. I'm pulling 4.5 maf v on a 70mm MAF.

t

WolfPlayer · 01-05-2007, 09:23 AM

I think 04stiguy's graph shows this more clearly than anything else. He has a turbo that once it begins spooling will spool very quickly and create a large change in MAF V and load over a very short period of time. Check out how his boost skyrockets between 3490 rpms and 3590 rpms. This will create a huge change in MAF V and a huge change in load. The graph clearly shows that. It also shows the AFR going crazy rich at that point.

Somebody gimme enrichment vs. delta MAF (or delta load)!!!!! If there is no delay parameters then this can be modified to help out a great deal!

t

04stiguy · 01-05-2007, 10:28 AM

Quote:

Originally Posted by WolfPlayer

I think 04stiguy's graph shows this more clearly than anything else. He has a turbo that once it begins spooling will spool very quickly and create a large change in MAF V and load over a very short period of time. Check out how his boost skyrockets between 3490 rpms and 3590 rpms. This will create a huge change in MAF V and a huge change in load. The graph clearly shows that. It also shows the AFR going crazy rich at that point.

Somebody gimme enrichment vs. delta MAF (or delta load)!!!!! If there is no delay parameters then this can be modified to help out a great deal!

t

Cobb sponsors this forum correct? Christian HELP!

I really dont want to go to a blow through.....

WolfPlayer · 01-05-2007, 10:34 AM

Quote:

Originally Posted by 04stiguy

Cobb sponsors this forum correct? Christian HELP!

I really dont want to go to a blow through.....

Christian is pretty darn busy right now. I've talked with him quite a few times about this issue and he said on bigger turbo setups he has always been able to get things to work by adjusting the FIBET. Have you adjusted your FIBET yet? If so, what is the current value you are using?

t

04stiguy · 01-05-2007, 10:46 AM

Quote:

Originally Posted by WolfPlayer

Regarding the MAF V spike, it is possible that this could happen because of the richness. Think about it. The car is building boost and starting to pull. All of a sudden a crazy amount of fuel gets injected into the motor. It's rather obvious to me that the car will slow down, MAF V will drop, load will drop, etc.

t

I agree to a point... It actually starts out as a positive spike, then goes into a mild dip after the rich spot. It is sensing reduced airflow caused by the rich condition, possibly a mild misfire. You can certainly feel it at times.

01-04-2007, 03:20 PM	#121
mofoSTI Spec C Club Car: 08 STI,sr20det 510 Fav Mod: boob job for wife Location: springtuckey, OR Posts: 2,435 Join Date: Sep 2004 Trader Rating: (0)	Wouldnt it suck if it came down to it that the issue really is just a loose ground wire. I have been picking my brain on this thread and have no other answer. This ad is not endorsed by this member. Please register or login to hide this ad.

01-04-2007, 05:45 PM	#125
R4ND0M_AX3 Grassroots STI Racer Car: 05 Subaru WRX STi Fav Mod: Cobb StreetTUNER Location: Elk Grove, CA USA Posts: 592 Join Date: Jul 2004 Trader Rating: (0)	The boost curve suddenly changes in that area too. 6-12psi takes about 400 rpm. 12-17 ish happens in 100 rpm. Maybe some sort of safety triggered of of a too aggressive boost curve. Just reaching here.

01-05-2007, 02:31 AM	#126
SCOOBYTRAP Gold Member Car: 05 STi CGM Fav Mod: JDM Foglights Location: NY Posts: 521 Join Date: Oct 2005 Trader Rating: (2)	...also how is the load calculated?

01-05-2007, 05:22 AM	#127
WolfPlayer Moderator & ECU Tech Car: 05 CGM STI Fav Mod: mo boostaz Location: Fredneck, MD Posts: 3,703 Join Date: Jun 2004 Trader Rating: (6)	First, definitely not a grounding issue. I have a grounding kit that redistributes the grounds to various parts of the motor/body (and, yes, the manifold grounding wires are UNDER the FMIC tabs). t

01-05-2007, 05:59 AM	#128
WolfPlayer Moderator & ECU Tech Car: 05 CGM STI Fav Mod: mo boostaz Location: Fredneck, MD Posts: 3,703 Join Date: Jun 2004 Trader Rating: (6)	Here is a graph of the log I posted on page 3. I tried to use the same colors as the other graph posted above while graphing the same thing.

01-05-2007, 06:07 AM	#129
WolfPlayer Moderator & ECU Tech Car: 05 CGM STI Fav Mod: mo boostaz Location: Fredneck, MD Posts: 3,703 Join Date: Jun 2004 Trader Rating: (6)	Regarding the MAF V spike, it is possible that this could happen because of the richness. Think about it. The car is building boost and starting to pull. All of a sudden a crazy amount of fuel gets injected into the motor. It's rather obvious to me that the car will slow down, MAF V will drop, load will drop, etc. t

01-05-2007, 09:23 AM	#132
WolfPlayer Moderator & ECU Tech Car: 05 CGM STI Fav Mod: mo boostaz Location: Fredneck, MD Posts: 3,703 Join Date: Jun 2004 Trader Rating: (6)	I think 04stiguy's graph shows this more clearly than anything else. He has a turbo that once it begins spooling will spool very quickly and create a large change in MAF V and load over a very short period of time. Check out how his boost skyrockets between 3490 rpms and 3590 rpms. This will create a huge change in MAF V and a huge change in load. The graph clearly shows that. It also shows the AFR going crazy rich at that point. Somebody gimme enrichment vs. delta MAF (or delta load)!!!!! If there is no delay parameters then this can be modified to help out a great deal! t