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Old 07-28-2009, 05:44 PM   #1
Linkseal
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Question Adviced Needed: 07 USDM STi Stg2 Master Map 4th Gear Pull

Hi,

I am not really good at analyzing the logs, so I look for your advice to educate me what I can improve by looking at the log.

Car: 2007 USDM STi
Mod:
-Cobb SR Intake
-Cobb Catted DP
-Blitz Nur-Spec R Catback
-Ings+ Kit, so more open end airflow

Stg2 Master Map 4th Gear Pull:
http://spreadsheets.google.com/pub?k...=0&output=html

Target boost is 18psi. I noticed that IDC maxout 107% after 5k rpm. So I am guessing I need to upgrade the injectors, but what else? What other stuff I need to do on my car to keep it happy and healthy?

You advice are golden. Thank you for your time.

- Link
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Last edited by Linkseal; 07-28-2009 at 07:29 PM.
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Old 07-28-2009, 05:52 PM   #2
alcoolaid
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Car could be running rich... get a WB and maybe you could lean it out a bit to bring the IDC down. Or lower boost but its quite low already.

I'd just suggest fuel pump + injectors or fuel pump and bump up the fuel pressure.
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Old 07-28-2009, 07:00 PM   #3
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I'm going to assume the car is running very rich. I'm pretty sure '07 came extremely rich from the factory - maybe someone can verify this. I find it hard to believe that your running out of injectors on a stock turbo as well which is another reason I think the car is running rich.

As for the logs, your not running very much timing from 2700-5500rpm, you could definitely pick up some more power by running more advance. I don't know if you tuned this yourself, or had someone tune it, but there is definitely room for improvement.

You should invest in a wide-band so you can more accurately log your AFR's... that should be priority right now.
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Old 07-28-2009, 07:24 PM   #4
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^ will the running really rich caused by the Cobb SRI?
I mean this is only base map and decided for K&N panel filter...

Ya, wide-band is the next mod, maybe bigger injectors and fuel pump...

Want to hear more!!
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Old 07-29-2009, 10:56 AM   #5
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Quote:
Originally Posted by Linkseal View Post
^ will the running really rich caused by the Cobb SRI?
I mean this is only base map and decided for K&N panel filter...

Ya, wide-band is the next mod, maybe bigger injectors and fuel pump...

Want to hear more!!
Yes, it probably is. With a larger then stock intake (i.e. Cobb SRI), the MAF sensor scaling is thrown off. The sensor sees more air and tries to compensate with more fuel. I know your MAF definitely needs to be scaled if your using an aftermarket intake.
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Old 07-29-2009, 04:46 PM   #6
Linkseal
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^ thx for the hints. Any thread about DIY MAF re-scale ?
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Old 07-30-2009, 12:04 PM   #7
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from the logs and G/S i'd say its alittle on the higher side for that boost level, depending on scaling and many other parts in the map can cause that. with the 550cc injectors that are in the 07 STi you shouldnt have an issues at stage 2.
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Old 07-30-2009, 05:12 PM   #8
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^ going for 650 cc + fuel pump might be able to solve the IDC problem right? But I hope to tweak abit of the MAF scale, to see if I can correct this before I go ahead to order the parts... WB on the way dough. Thx
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Old 08-01-2009, 06:16 PM   #9
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I don't think you need the injectors. Actually I know you wont Once you get the WB and dial it in you should be close to 100%. After the Fuel pump it should bring you don't enough to where you will be ok... Low 90% range. I tune out in Reno, NV area and every STi that is Stg2 with no fuel upgrades runs a safe AFR of 10.9-10.6. Their IDC's are 95% MAX on a 4th gear pull from 2200-7000rpm! So get the WB and fuel pump and you will be fine once you dial it in!

Cory
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Old 08-04-2009, 03:51 PM   #10
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^ Thx for the hints...still looking for help in re-scaling the MAF...cobb intake hit 300g/s when we logged again last weekend
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Old 08-05-2009, 01:17 PM   #11
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Can you post up a Learning View Screenshot?
To scale your MAF with RomRaider:
Open RomRaider ECU Editor load you rom, then open the logger from the logger menu. Then open the MAF tab at the bottom . Change the max intake temp to 150 and click record data. Then drive around for an hour or so at freeway cruising, in town, uphill freeway cruising, and some slow parking lot driving. Be smooth and avoid boosting because you want to stay in closed loop as much as possible. After you finish your drive change the MAFv range to reflect the areas where you have a good amount of data points, if you drove enough you may not need to change it. After that click Interpolate and then click update MAF. You can close the logger and save your rom in the ECU Editor. Flash your rom and drive a while then run Learning View and Verify that you are within +/- 5% for A,B,C and within +/- 1% for D.
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Old 08-06-2009, 03:52 PM   #12
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^ Big thanks to your MAFv rescale tip, I followed your intruction last night, drove around for an hour and I update the MAF below 60g/s... gonna reflash the car and let it run a bit, say 3 tank of gas and see what will improve on the LV table.

Here is the LV table BEFORE MAF remaping, look horrible on A,B,C,D



I was also doing the MAF log following the instruction from mickeyd2005's CL MAF scale, I am just wondering, which one will be more accurate, the RomRaider MAF rescale, or the mickeyd2005's CL MAF scale? Or, they are different and I need to do them both?

AAny advice is golden!

- Link
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Old 08-06-2009, 07:19 PM   #13
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I use RR to get close because its basically automated and then I use the spreadsheet to make my final changes. If you are happy with your results after a couple of times using the RR tool then you may not need the spreadsheet.
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Old 08-06-2009, 07:22 PM   #14
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^ Thx for the fast reply.
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Old 08-10-2009, 11:46 PM   #15
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After CL MAF re-scaling, here is the result, we will start to do the OL soon...

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Old 08-14-2009, 11:55 AM   #16
Linkseal
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Here is the update after CL scaled with Cobb SRI

-USDM 07 STi Stg2 4th Gear WOT Pull after CL fix (OL not done yet)

http://spreadsheets.google.com/pub?k...=0&output=html

Condition:
- 94 Octane
-Elevation above sea Level 62 ft
-Rel. Humidity 60%
-Air Temp 60F
-Delta Weight 266 lb (2 people+1/4 tank gas)
-Tire width, mm 235
-Aspect Ratio 40
-Wheel size, in 18
-Tire Diameter, in 25.40

What I see:
- IDC Max out 105%, but at least better than before 108%
- Same as before, MAF Max out 300g/s after 5k rpm
- Better hp and tq flow, wtq max at 3,700 rpm,unlike 4,100rpm last time

What I don't see:
- No more FKC under 3k rpm in low engine load zone
- No FLKC
- No change on Knock Sum

What I want to ask:

1. -3.10% still on Section D of LV; By looking at the WOT pull, it suggest -2.34% A/F learning, so should do it -3.10% or 2.34% for OL correction? (We don't have WB, since we have Cobb catted DP (don't want to drill a hole)

2. Walbro 255 FP will be installed soon, will this help out to bring down the IDC, without injector upgrade?

3. Map timing was decided for 91 Oct, we are using 04 Oct, how can I bump up the timing and WDC? Any hint, or just increase about 3% as a guess?

Any input and comment is golden! Thanks in advance.

- Link
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