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Old 04-03-2012, 12:24 PM   #1
Casper2012
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Default AEM intake + Cobb AP stage 1 Dyno results

I have a 2012 WRX and recently installed a AEM cold air intake, and a Cobb AP. I ran the car on the 93 octane map Stage 1 for AEM intake. I was not seeing the estimated 17.5 psi, so I had to use the High wastegate map and everything dialed in perfectly. The car ran good and strong with plenty of low end. So I thought I would take it to the local dyno to see what the car was making.

The dyno is a dynojet (about a year old)

Mods: AEM cold air intake, Cobb AP (stage 1)

Fuel: Shell 93 octane

We loaded the car on the dyno, and ran the tailpipe sniffer in for air fuel readings. We did not hookup the boost hookup as I didnít want to pull any vac lines loose.

So after getting the car up to temp and getting the first pull:

Numbers pull 1: 245 whp and 271 ft lbs of torque. (peak boost 17.6 psi)
- the air fuel on this run was bottomed out at 10.3 on the a/f gauge (so richer than 10.3).

We needed to get some fuel out of the tune. So curious as to what the car would do on the standard Stage 1 93 octane map (for stock airbox) with the high wastegate map (because the car needs underboosts), we loaded up this map.

This map is calibrated for the stock airbox and filter but also targets only 16.5 psi of boost (1 psi less than the AEM intake map from Pull 1).

Well the results were as follows

Pull 2: 272 whp and 285 ft lbs of torque. (peak boost 16.7 psi)
- The air fuel was much better running 11.0 to 11.4 ish through out the full boost area.

Pull 3: Which was stock ECU programming with AEM intake installed. Produced similar air fuel ratios to Pull 2 but slightly leaner in the spool up area. Around 12.5 to 12.0 during spool up before going down to mid 11ís around 5k and staying around 11.3 to 11.3 at the top end. The boost was lowered back to stock levels. But the power was close to Pull 1. I donít remember the exact numbers.

Needless to say, I left with the stage 1 93 map for stock intake. The car runs great and the extra power is definitely felt over the AEM intake stage 1 map.

Just thought I might share my results.
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Old 04-03-2012, 01:27 PM   #2
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i hope you are ready to pay for some new parts...
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Old 04-03-2012, 01:46 PM   #3
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Which new parts am I going to need?
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Old 04-03-2012, 02:42 PM   #4
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Thanks for the share. This shows how a better settings for AFR and possibly timing can lead to better results rather than a higher boost with wrong AFR settings. Lower boost means less turbo lag also generally so another benefit.
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Old 04-03-2012, 03:28 PM   #5
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like maybe an engine? cool that you checked all of this out on a dyno though. good luck with everything.
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Old 04-03-2012, 03:45 PM   #6
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Why would he need to buy a new engine. Results seem pretty legit.

I have the Cobb AP Stage 1 with Nameless Performance exhaust and that's it. It pulls really hard all the way up to redline and max boost that I see is just under 16psi... only logged it twice. Currently searching for a Cobb catted downpipe.
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Old 04-03-2012, 03:59 PM   #7
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What a dumb comment. No need to worry about an engine that much. Stay away from using launch control and record and read logs often to make sure everything is running good. You got me wondering about my AEM now, I will have to play with my car now too.
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Old 04-03-2012, 04:41 PM   #8
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With the AEM Stage 1 map it was severely rich. Our guess is in the high 9's air fuel ratio. It was running so rich that 1 psi less boost and leaning up to low 11's a/f ratios made almost 30 whp more and 14 more ft lbs of torque (at less boost). I was really surprised at the results. Hopefully someone else can verify this on another AEM car. I wouldn't think mine would be different that other 2011-2012 models but you never know. The fact that the car is happy and making that much more power less boost tends me to think that that is the best tune for the AEM (at least for my car).
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Old 04-03-2012, 07:40 PM   #9
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Yeah ignore the guy's comments about new engine lol he must be trolling hard. Anyway I would do a datalog along to be sure your engine is running healthy Feel free to post it here if you get the log, and we will give you input on it if you want
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Old 04-03-2012, 09:46 PM   #10
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Next time at the track, which hopefully will be soon, I will run with my stock intake and remove the AEM. I am really curious to see if it makes more power with the stock airbox.
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Old 04-04-2012, 08:14 AM   #11
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Quote:
Originally Posted by Xtreme. View Post
Yeah ignore the guy's comments about new engine lol he must be trolling hard. Anyway I would do a datalog along to be sure your engine is running healthy Feel free to post it here if you get the log, and we will give you input on it if you want
yup thats me for sure... god knows i love to troll.
but being as i am a troll, i obviously dont know anything and should be ignored.

like said before have fun and good luck to the OP with whatever he decides to do. fighting with people over the internet who obviously know so much about tunning and how cars work is pointless and a waste of my time. everybody seems to be a professional tuner these days
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Old 04-04-2012, 08:59 AM   #12
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Im not sure how to post a log file. I can email it if I get an email address. I made a log last night.
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Old 04-04-2012, 09:37 AM   #13
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Quote:
Originally Posted by guygettnby View Post
everybody seems to be a professional tuner these days
including you
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Old 04-04-2012, 10:22 AM   #14
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I would only be concerned with running the stock intake tune with an AEM intake because of the Long Term Fuel Trim learning the ECU will do. You may have had a good AFR on the dyno, but the ECU is going to adjust the LTFT's to learn how to reach optimal targeted fuel ratio's at any given throttle position. Now if the ECU is pulling fuel out in cell "D", this cell is added/subtracted to the final commanded AFR at Wide Open Throttle. So you will want to keep an eye on this value. If it starts showing as a negative number, your final AFR will be leaner than what you saw on the dyno.

An aftermarket intake also changes how the car controls boost so this would probably be why you didn't reach boost target using the Stock Intake stage 1 tune. The car will eventually learn to increase the WGDC over time, but it will never be optimal with your AEM intake.

I would recommend downloading Access Tuner Race, installing the correct Cobb OTS tune, then get back on the dyno and use ATR to lean out the AFR to 11.0:1. I bet this would make more power than you currently make. And ATR is free. OR even better, do the above and get a Wideband and tune on the street. That way you dont have to waste money on a dyno again.
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Old 04-04-2012, 11:30 AM   #15
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Quote:
Originally Posted by Casper2012 View Post
Im not sure how to post a log file. I can email it if I get an email address. I made a log last night.
transfer the log from the AP to your computer then upload the data log to google documents. from there change the security settings to allow people who have the link to veiw the file. then simply copy and paste the links.
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Old 04-04-2012, 11:43 AM   #16
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Quote:
Originally Posted by hakira View Post
including you
i never claimed to know everything or be a professional tuner. i do however know that just because the dyno sniffer told him he was running a 11.4 right after he flashed the map and the fact that most tail pipe sniffers are not very accurate that he has a chance of hurting his car. plus the map he is running is not made for his setup and could change on him down the line once the ecu starts making some adjustments, he gets bad gas or even if the weather changes.

my whole point is if he wants a better tune he needs to have a custom tune done. wether that is an e-tune or going to a shop. i am also assuming he does not have a wide band that he can moniter in case something changes and he is not aware of it.

but i am far from being a troll or ignorant.
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Old 04-04-2012, 11:54 AM   #17
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I have the datalog ready to send to someone. It is a 3rd gear pull from 2500 RPM to Redline. This forum wont let me add an attachment. So if you can post a file, send me your email and I will email it to you for you to post.
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Old 04-04-2012, 12:16 PM   #18
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What version AEM intake map were you using? The latest are v3.11 available from the Maps section of our website.

Ian
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Old 04-04-2012, 12:21 PM   #19
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Quote:
Originally Posted by Casper2012 View Post
I have the datalog ready to send to someone. It is a 3rd gear pull from 2500 RPM to Redline. This forum wont let me add an attachment. So if you can post a file, send me your email and I will email it to you for you to post.
Put it on google docs and Please do not forget to set permissions to public
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Old 04-04-2012, 01:41 PM   #20
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Quote:
Originally Posted by guygettnby View Post
i never claimed to know everything or be a professional tuner. i do however know that just because the dyno sniffer told him he was running a 11.4 right after he flashed the map and the fact that most tail pipe sniffers are not very accurate that he has a chance of hurting his car. plus the map he is running is not made for his setup and could change on him down the line once the ecu starts making some adjustments, he gets bad gas or even if the weather changes.

my whole point is if he wants a better tune he needs to have a custom tune done. wether that is an e-tune or going to a shop. i am also assuming he does not have a wide band that he can moniter in case something changes and he is not aware of it.

but i am far from being a troll or ignorant.
No mean to disrespect you man, we are all joking around, but yeah you do have a good point. I just don't think he is going to need a new engine... He needs to make sure the tune is appropriate for the setup thus posting logs can help

Quote:
Originally Posted by Cobb Tuning View Post
What version AEM intake map were you using? The latest are v3.11 available from the Maps section of our website.

Ian
I would definitely try this...

Quote:
Originally Posted by Dartholomew View Post
Put it on google docs and Please do not forget to set permissions to public
+1
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Old 04-04-2012, 02:10 PM   #21
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I downloaded the maps last friday for the AEM intake. I downloaded all 3 maps for 93 octane stage 1 + AEM intake. The one I dynoed with in PULL 1 was

COBB Tuning, v3.11 -- Stage1+AEM 93 MTv311 HWG - Intended for an otherwise stock 2012 Subaru WRX MT vehicle with a stock or cat-back exhaust and AEM Cold Air intake system. 93 or 94 octane fuels. Boost Targets: ~17.5psi peak boost pressure tapering down to ~14.5psi by the 7000 RPM redline, +/- 1.5psi. Use if regular mapping produces less than desired boost levels.

Ian, I emailed you the datalog for the way the car sits now. AEM intake installed with stock airbox stage 1 map.

The car was using this map on the datalog and on Pull 2 on the dyno:

COBB Tuning, v3.00 -- Stage1 93 MTv300 High Waste Gate - Intended for an otherwise stock 2012 Subaru WRX MT vehicle with a stock or cat-back exhaust, STOCK INTAKE SYSTEM, and STOCK INTAKE FILTER ONLY. 93 or 94 octane fuels. Boost Targets: ~16.5psi peak boost pressure tapering down to ~13.5psi by the 7000 RPM redline, +/- 0.8psi. Higher wastegate duty cycle. Use if regular mapping produces less than desired boost levels.

Last edited by Casper2012; 04-04-2012 at 02:41 PM.
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Old 04-04-2012, 10:19 PM   #22
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Quote:
Originally Posted by Casper2012 View Post
I have the datalog ready to send to someone. It is a 3rd gear pull from 2500 RPM to Redline. This forum wont let me add an attachment. So if you can post a file, send me your email and I will email it to you for you to post.
Please read my post again on how to show us the log file. It really is that simple and once you do it you will see.
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Old 07-31-2012, 05:40 PM   #23
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I was running Cobb ACN Stage 1 + Aem as well. My car experienced boost creep and fuel cut with that program and part throttle accel was sluggish. Switched to regular ACN Stage 1 and it pulls to 5th now with no surprises. Weird. I havent checked knock or anything, but afrs were high 10s. Only other mod to the car is pitch stop mount...
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Old 08-01-2012, 07:12 AM   #24
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Wow...this post makes me want to get a protune instead of using the OTS Cobb tune.

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Old 08-01-2012, 09:22 AM   #25
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Quote:
Originally Posted by shaky1 View Post
I was running Cobb ACN Stage 1 + Aem as well. My car experienced boost creep and fuel cut with that program and part throttle accel was sluggish. Switched to regular ACN Stage 1 and it pulls to 5th now with no surprises. Weird. I havent checked knock or anything, but afrs were high 10s. Only other mod to the car is pitch stop mount...
Boost control of any individual car can respond differently (on even stage 1 cars) due to car-to-car variation. The majority of cars are just fine, but some will underboost and some will overboost on the exact same map. This is why we offer different wastegate maps (low, normal, and high) that you can use (download from the maps section at cobbtuning.com). If you are overboosting, you would reflash the low wastegate map. If you are underboosting you would use the high wastegate map.

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