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Old 08-04-2003, 12:20 PM   #1
Fulton 1
Scooby Newbie
 
Member#: 24904
Join Date: Sep 2002
Location: Marysville, WA
Vehicle:
2003 WRX Sedan
Black Cobb S2

Thumbs up Another believer in AccessECU.

Having owned and still owning my share of V8's, the major complaint I had about the stock WRX was the lack of power below ~3500rpm. I knew this going in, so it wasn't a surprise, but it did leave me wanting more. My first step was installing an APS uppipe and ScoobySport downpipe/axleback, which made a very nice improvement by allowing the turbo to spool faster and sooner, but IMO there was still room for improvement.

Its important to note that this car is not my hotrod, but instead my wife's daily driver. With this in mind I was looking for a modest increase in power with driveability and reliability being priorities. After hearing so much positive feedback on Cobb's AccessECU I went ahead and purchased their Stage 2 setup for 91 octane (best we get here is 92). All I can say is WOW. The improvement is more pronounced than I felt with the addition of the uppipe/downpipe/axleback combo. Driveability is now much better than OEM, low range power is much improved, and (as others have noted) power delivery is so smooth its almost deceiving. Shifting through the gears smoothly is effortless now. Along with 17" wheels and tires, this has been the best money spent on the car to date.

Even with the uppipe, Trey recommended their Stage 2, but they also modified my EGT parameters, so I continue to run the stock sensor. This just addresses the P0546 issue. My version is 1.07 and under some load I'm seeing boost ~.11MPa on the stock gage (which is right on target for Stage 2).

Again, just wanted to share my experience for those that might be on the fence or have similar goals.
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Old 08-04-2003, 02:22 PM   #2
svelt
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Member#: 35693
Join Date: Apr 2003
Location: wi
Vehicle:
03 wrx wagon
white

Default

I also have just received the stage 2. Rev 1.07 (93 octane) and have a Stealthback w/high flow cat, a Prodrive muffler with catless OEM up-pipe all adding up to a $1500 mod.

Although I havenít seen the boost get over 15 psi (as others have commented); but then, I havenít used a tank of gas yet either. The power band is very smooth and response in the lower RPMs is noticeable. Now I think the car is more what I wanted it to be and am satisfied with its performance.
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Old 08-04-2003, 05:01 PM   #3
bart'03
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Join Date: Apr 2003
Location: FCL, CO
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03 WRX Wagon
PSM

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Fulton,
I am sitting on the fence right now. I currently have Autospeed uppipe and Prodrive muffler and am debating on purchasing the Cobb stage 1 now, or going ahead to buy a Scoobysport downpipe and Cobb stage 2.
Also, how is the muffler sound level now with your current setup?
-B
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Old 08-04-2003, 06:08 PM   #4
Fulton 1
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Member#: 24904
Join Date: Sep 2002
Location: Marysville, WA
Vehicle:
2003 WRX Sedan
Black Cobb S2

Default

Quote:
Originally posted by bart'03
Fulton,
I am sitting on the fence right now. I currently have Autospeed uppipe and Prodrive muffler and am debating on purchasing the Cobb stage 1 now, or going ahead to buy a Scoobysport downpipe and Cobb stage 2.
Also, how is the muffler sound level now with your current setup?
-B
bart,
If possible, go for the downpipe and stage 2 Otherwise, I'd contact Josh or Trey and see what they recommend for your current mods. Seems like the downpipe is the key to the stage 2 setup, but I'd personally go right to the source. Trey has been very good about responding to my emails in the past. Also, here's a good link with some interesting AccessECU FAQs: http://www.wrxforum.com/cgi-bin/ulti...c;f=2;t=001803

My exhaust with SS axleback is pretty mellow, but has a nice, deep tone. It was exactly what I was looking for sound-wise - fairly subdued, but certainly more audible than stock. The rallyperformance website has a good soundclip. I've noticed no change in exhaust sound with the addition of the tuning.

svelt,
Check your boost level when the car is under more load if you haven't done so (e.g. accelerating up a grade). The AccessECU seems to modulate boost depending on the conditions. I've seen peaks anywhere between .10MPa and .11MPa depending on load and ambient temps. Higher loads and cooler temps tend to bring out the higher boost levels in my case. Apparently (according to the Cobb forum) turboback efficiency also plays a role with the stage 2.

Last edited by Fulton 1; 08-04-2003 at 06:15 PM.
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Old 08-04-2003, 06:59 PM   #5
hphan
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Member#: 33432
Join Date: Feb 2003
Location: LA, Kalifornia
Vehicle:
2003 WRX wagon

Default Same here

Fulton,
That's amazing how similar your post is to my thank-you email to Cobb today. I too recently got my Stage 2 AccessECU (version 1.07). Everything you posted is right on of my assessment. Even the very first drive I was getting ~0.11MPa, assuming the stock gauge is accurate. This is definitely the best bang for the buck!
-Henry
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Old 08-04-2003, 07:18 PM   #6
svelt
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Member#: 35693
Join Date: Apr 2003
Location: wi
Vehicle:
03 wrx wagon
white

Default

Fulton,
I've been driving in fairly humid conditions and have had the AC on for loading - I expect it will up the boost, my gage is an Omori Electic - its pretty accurate. But it has great response and I'm not concerned with boost #s at this point.

The Prodrive muffler got a little more noticable when when I gutted the up-pipe, but as you mentioned, not with the reflash.
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Old 08-04-2003, 09:31 PM   #7
esteve
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Member#: 28716
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Los Angeles
Vehicle:
2006 STI

Default Re: Another believer in AccessECU.

Quote:
Originally posted by Fulton 1

My version is 1.07 and under some load I'm seeing boost ~.11MPa on the stock gage (which is right on target for Stage 2).

Again, just wanted to share my experience for those that might be on the fence or have similar goals.
It was nice seeing your review as I have a very similar setup (STi uppipe, ScoobySport downpipe, Stromung muffler) and got the stage 2 remap (version 1.07) about 2 weeks ago and I share a lot of your sentiments.

The only thing is I'm not hitting target boost like you are. The best I can manage is .095 mpa and usually it peaks at .09 mpa. If you don't mind, could you break down your peak boost levels in each gear? I emailed Cobb and should be getting another restrictor hose but I'd rather keep using the stock one.

When I had the stage 1, I had no trouble hitting .11 mpa using the restrictor hose they sent me! I wish I could do that now!

I am getting a lot more power than the stage 1 even with the reduced boost. Using my old G-Tech with the stage 1, I got 182 whp and with the stage 2 I'm hitting 200 whp. I figure the meter is on the conservative side, like what Vishnu's dyno reads.

Thanks!
Steve
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