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07-14-2013, 02:15 AM | #1 |
Scooby Newbie
Member#: 321690
Join Date: May 2012
Location: Chandler
Vehicle:2009 STi hatchback white |
Looking for some help with basic break-in tune using AP on 09 STi
Was wondering if someone local in the AZ east valley (chandler/gilbert area) might have some time Sunday 7/14 to help a fellow subie. I just got done installing a new built short block with some mods:
* TGVs deleted * SAI deleted * 7mm phenolic intake spacers * aftermarket turbo uppipe * aftermarket turbo inlet pipe * 750cc injectors * walbro 255 pump I am trying to get a break-in tune set-up using Accesstuner Race. I am basing the tune off of Cobb Stg 2 ACN91 lwg which I was running prior to the new engine. The engine starts but runs rough, I am trying to scale for the injectors and get it running good enough so I can break it in, and then head over to FAT for a proper tune. I already asked FAT for a break-in tune but I've been out of town last week and not able to call them for follow-up. I was hoping to drive it tomorrow, I need to go to the airport Monday morning. If anyone might be available for like 30 mins before noon or after 5pm I would appreciate it! I understand the basics of accesstuner race but it would give me a boost of confidence with someone experienced looking over my shoulder. Just looking to dial in A/F corr, not worried about tuning timing/boost. I already disabled the DTCs for the TGV and SAI deletes.
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07-14-2013, 11:38 AM | #2 | |
Scooby Specialist
Member#: 107352
Join Date: Feb 2006
Chapter/Region:
SWIC
Vehicle:Not Respectable |
What kind of car is it? What kind of 750 injectors? There is information to be found about the latency values for most of the popular injectors around the web, if those values weren't provided.
Cobb's injector scale is pretty weird. I don't know if you've already done it or know how, but this is right from Cobb's tuning guide: Quote:
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07-14-2013, 01:58 PM | #3 | |
Scooby Newbie
Member#: 321690
Join Date: May 2012
Location: Chandler
Vehicle:2009 STi hatchback white |
Quote:
I understand Cobb's scaling equation. I made some progress this morning, got my A/F corr close to 0 when idling, and A/F learning was like +4%. I then went to drive it around the block and it's running rough. I data logged and the A/F corr was jumping around between +/- 20%, and the A/F learning was 0~3%. The check engine light and cruise light flashed briefly a couple of times - like I was misfiring. But no DTCs for misfiring were registered. It feels like the engine is misfiring - runs rough, low power. The only thing I am struggling with is that the idle vacuum is 8.5~8.7 psi, it was 10 psi on my old engine. Would a vac leak throw off the injector control? The weird thing is that I had to raise the injector scalar to 4722 to get the fuel trims down. This seems way too high of a scalar for 750cc injectors. The base scalar from the Cobb map (Stg 2 ACN91 lwg) was 4813. |
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07-14-2013, 07:01 PM | #4 |
Scooby Specialist
Member#: 107352
Join Date: Feb 2006
Chapter/Region:
SWIC
Vehicle:Not Respectable |
A vacuum leak would make a problem for your fuel trims. You are allowing unmetered air into the system and the A/F corrections would be trying to add fuel into the mix to compensate for the extra air.
Again, what intake do you have? Anything other than a stock sized MAF housing will play a huge part of the equation. Do you have an aftermarket BOV on the car? |
07-14-2013, 07:25 PM | #5 | |
Scooby Newbie
Member#: 321690
Join Date: May 2012
Location: Chandler
Vehicle:2009 STi hatchback white |
Quote:
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07-15-2013, 12:32 AM | #6 |
Scooby Specialist
Member#: 23123
Join Date: Aug 2002
Chapter/Region:
SWIC
Location: Gilbert, AZ
Vehicle:15 WRX 6MT 07 Legacy SpecB |
I do not believe FAT currently has a tuner. Snail performance is not there any more.
I'd be happy to help ya out. Txt or call 4807459967 |
07-15-2013, 08:01 PM | #7 | |
Scooby Specialist
Member#: 74753
Join Date: Nov 2004
Chapter/Region:
BAIC
Location: Snail Performance
Vehicle:2003 Wrx 2.5Lw/gt30r Team Snail |
Quote:
Hit up Travis "Z0rr0" he can get you hooked up. I build a map for your car and sent it to FAT but I'm sure it was lost due to Taylor not being there anymore now. Travis Snail Performance |
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07-15-2013, 11:24 PM | #8 |
Scooby Newbie
Member#: 321690
Join Date: May 2012
Location: Chandler
Vehicle:2009 STi hatchback white |
Thanks guys. I had it towed today to FAT so they could troubleshoot it. I definitely be following up on a tune. I am in Nashville through Thurs. I appreciate the responses.
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07-16-2013, 01:17 AM | #9 |
Scooby Specialist
Member#: 23123
Join Date: Aug 2002
Chapter/Region:
SWIC
Location: Gilbert, AZ
Vehicle:15 WRX 6MT 07 Legacy SpecB |
Thanks Travis, coyotesfan, let me know when you want me to take a look at it.
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07-16-2013, 11:46 AM | #10 |
Scooby Newbie
Member#: 334724
Join Date: Oct 2012
Chapter/Region:
SWIC
Location: Tempe, AZ
Vehicle:2002 WRX wagon PSM |
^^bump for Travis (Z0rr0) tuning. He does a great job and will explain everything, your car will thank you lol
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07-16-2013, 02:45 PM | #11 |
Scooby Specialist
Member#: 224249
Join Date: Sep 2009
Chapter/Region:
SWIC
Location: Phx, AZ
Vehicle:2002 Subiworx built/ Soulless tuned Bugeye |
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07-16-2013, 02:56 PM | #12 |
Scooby Specialist
Member#: 23123
Join Date: Aug 2002
Chapter/Region:
SWIC
Location: Gilbert, AZ
Vehicle:15 WRX 6MT 07 Legacy SpecB |
We were looking for infinity plus infinity.. lol
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07-18-2013, 10:47 AM | #13 |
Scooby Newbie
Member#: 321690
Join Date: May 2012
Location: Chandler
Vehicle:2009 STi hatchback white |
Update: FAT found my #4 injector pig tail was tweaked and somehow #4 wasn't delivering fuel. Then the owner (Robert I think) explained to me a whole bunch of issues he thought was wrong with car, but he didn't know I hadn't tuned it yet, it had a DTC for one tgv being closed. I explained that this was a new engine and I had deleted the tgv's along with other mods. I had mentioned this to the guy that answered the phone when I arranged to have it towed over there. Apparently that wasn't relayed to Robert. And to make it worse I was not able to be there in person to talk with them when my car was dropped off. My bad on that.
So I guess there was miscommunication on both sides, but I sensed Robert was frustrated, it may be due to their recent turnover. He was very direct with me (kind of scolded me for not having a pro tune on it) and i was a bit surprised with that. I hope that FAT can remain a good shop, they're somewhat close for me. I guess I'll be considering working with subiworx in the future. But I would still say they are a decent shop and I'm not bashing them. |
07-19-2013, 02:21 AM | #14 |
Scooby Specialist
Member#: 107352
Join Date: Feb 2006
Chapter/Region:
SWIC
Vehicle:Not Respectable |
Glad you figured out what the problem was. In the future, if you have an issue similar to this, you can look at the "Roughness Monitors" to see if a cylinder is misfiring.
I don't think the frustration was a result of the recent happenings at the shop. That's just the way he is. You probably caught him on a good day. lol |
07-20-2013, 01:02 AM | #15 |
Scooby Newbie
Member#: 321690
Join Date: May 2012
Location: Chandler
Vehicle:2009 STi hatchback white |
Thanks everyone. Travis hooked me up with a conservative tune for my break in. Car is running is good A/F's and I'm finally back in the boost (albeit 7psi).
Final tune coming after break in. I see corn in my future. |
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