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Old 08-21-2011, 11:06 AM   #1
sry110
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Join Date: Sep 2009
Location: Phoenixville, PA
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2004 WRX STi
Java Black Pearl

Default Need some quick AP v2 help

Last week I picked up a 2004 STi with 83k miles and the following mods:

* SPT short ram intake
* Megan 2" catless up pipe
* Megan 3" catless down pipe
* Invidia N1 "cat"-back exhaust
* Cobb AP v2

I'll admit I have never used the AP, I'm totally new at this. Here is what I am noticing though:

1) Get a lot of fuel smell when the car is sitting still, i.e. when I pull up to a stop light

2) Sounds like I get some after-fire in between shifts or when letting off the gas

3) Got about 100 miles to a half tank of 93 octane which is a bit under 17 mpg at that rate. Haven't been boosting all that much so I was expecting closer to maybe 20 mpg.

These 3 observations make me think the car is running too rich, which I need to remedy ASAP. I also want to have the car tuned for 91 or 92 octane which is more common around where I live. I also want to run a Stage 1 tune because this is my daily driver and big power is not my goal. Can anyone recommend which Cobb off-the-shelf tune I should run based on all of the above?
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Old 08-21-2011, 02:58 PM   #2
wrx904
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Quote:
Originally Posted by sry110 View Post
Last week I picked up a 2004 STi with 83k miles and the following mods:

* SPT short ram intake
* Megan 2" catless up pipe
* Megan 3" catless down pipe
* Invidia N1 "cat"-back exhaust
* Cobb AP v2

I'll admit I have never used the AP, I'm totally new at this. Here is what I am noticing though:

1) Get a lot of fuel smell when the car is sitting still, i.e. when I pull up to a stop light

2) Sounds like I get some after-fire in between shifts or when letting off the gas

3) Got about 100 miles to a half tank of 93 octane which is a bit under 17 mpg at that rate. Haven't been boosting all that much so I was expecting closer to maybe 20 mpg.

These 3 observations make me think the car is running too rich, which I need to remedy ASAP. I also want to have the car tuned for 91 or 92 octane which is more common around where I live. I also want to run a Stage 1 tune because this is my daily driver and big power is not my goal. Can anyone recommend which Cobb off-the-shelf tune I should run based on all of the above?
You are not going to be able to run a stage 1 tune because you have a aftermarket downpipe. You should be running a stage 2 tune with your AP. The smell is from your car being cat-less. It does sound like you are running a little rich; probably from a OTS map, which tends to be on the safe side. You should look into getting a Pro-tune.
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Old 08-21-2011, 07:02 PM   #3
sry110
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Java Black Pearl

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Quote:
Originally Posted by wrx904 View Post
You are not going to be able to run a stage 1 tune because you have a aftermarket downpipe. You should be running a stage 2 tune with your AP. The smell is from your car being cat-less. It does sound like you are running a little rich; probably from a OTS map, which tends to be on the safe side. You should look into getting a Pro-tune.
Cool thanks for the info. So if i understand correctly the OTS map from Cobb makes you run a little rich to keep temperatures down and therefore be more "safe"? Thought about getting a pro-tune but don't really want to spend the $$$ on it. I guess I will deal with a few less mpg and spend $$$ on that in the mean time.

If I run a stage 2 fuel-eco map will that make me run a little less rich? I don't mind the lower power output since this is my daily driver.
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Old 08-21-2011, 08:46 PM   #4
wrx904
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Quote:
Originally Posted by sry110 View Post
Cool thanks for the info. So if i understand correctly the OTS map from Cobb makes you run a little rich to keep temperatures down and therefore be more "safe"? Thought about getting a pro-tune but don't really want to spend the $$$ on it. I guess I will deal with a few less mpg and spend $$$ on that in the mean time.

If I run a stage 2 fuel-eco map will that make me run a little less rich? I don't mind the lower power output since this is my daily driver.
I'm not sure about the eco map. The only map that I run is one from Clark Turner.
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Old 08-22-2011, 08:58 AM   #5
Cobb Tuning
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Quote:
Originally Posted by sry110 View Post
Cool thanks for the info. So if i understand correctly the OTS map from Cobb makes you run a little rich to keep temperatures down and therefore be more "safe"? Thought about getting a pro-tune but don't really want to spend the $$$ on it. I guess I will deal with a few less mpg and spend $$$ on that in the mean time.

If I run a stage 2 fuel-eco map will that make me run a little less rich? I don't mind the lower power output since this is my daily driver.
Our OTS maps are not going to be any richer or leaner than stock during cruise-type driving (i.e. in closed loop). With a catless exhaust you will get a fuel smell, especially when stopped. You can also hear the after-fire at times. This is due to being catless - not because you are necessarily running rich. If that is something you do not want to live with, the solution would be to fit an aftermarket catted downpipe. Any non-stock downpipe will require the stage 2 tune.

If your car does have a fueling issue, this can usually be determined by doing some data logging and looking at your long-term fuel trims (A/F Learning 1 A,B,C,D) after a good bit of closed loop driving. This is assuming that you have an AccessPORT version 2.

Bill
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Old 08-28-2011, 03:39 PM   #6
Scooby2002
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Why does catless require stage 2?
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Old 08-29-2011, 09:03 AM   #7
Cobb Tuning
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Quote:
Originally Posted by Scooby2002 View Post
Why does catless require stage 2?
A stage 2 map means it is designed for an aftermarket downpipe. Whether that downpipe is catted or catless doesn't matter from the perspective of "stage 2". However, for our stage 2 OTS maps, we do recommend that you use a catted downpipe as catless downpipes can potentially cause a mechanical condition called boost creep which can result in overboosting (particularily with the later 2.5L Subarus).

Bill
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Old 09-22-2011, 12:06 PM   #8
sry110
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Member#: 222380
Join Date: Sep 2009
Location: Phoenixville, PA
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2004 WRX STi
Java Black Pearl

Default

UPDATE:
I have replaced my catless downpipe with a Perrin 2-piece catted downpipe. I have also replaced the SPT short ram intake with the stock airbox (although I do not have the silencer or from ram scoop installed). I have also loaded the latest maps onto the AP from the Cobb website and flashed the car to the Stage2 91 octane map (because some places around here don't have 93). I am noticing the following things.... any thoughts or comments are appreciated:

1) I cannot get into boost in 1st gear. (I think this was the same before I replaced the downpipe and reflashed)

2) It is reluctant to boost in 2nd gear and when it does it tops out at maybe 10 psi

3) In 3rd and 4th gears it will boost up to ~15 psi

4) In 5th gear from about 2k RPM it seems more reluctant than before to build boost and get me out of the bog

I'm running either 92 octane or 93 octane at all times. Are these issue indicative of a bad tune? Boost leak? Some other engine issue?
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Old 09-22-2011, 04:15 PM   #9
Cobb Tuning
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Your peak boost can vary by gear - the higher the gear, the more likely you are to hit higher boost levels. You will not generally hit your target in 1st gear. In addition to the gear you are in, it also depends on what RPM you start your run.

I would get a data log using the AccessPORT of a 3rd gear run from 2000 RPM to around 6500 RPM (if you can so safely). This will give a good general picture of boost control. Use the default logging set (do not add or remove any parameters). You can post your log on google docs and link to it here (make sure you change the permissions so anyone can view it).

Here's a general video on how to data log with the AccessPORT v2:

Bill
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