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Old 05-01-2013, 03:07 PM   #1
rhinogt
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Unhappy 2012 WRX lost 100hp on VD

Hello everyone i have an issue I am seeking help with on my 2012 WRX sedan.

Monday I upgraded to TP stage 3 tune and was data logging for Eric to look and I noticed that it felt much slower. So I loaded the 3rd gear pull to virtual dyno and it is showing about 100 hp less that my previous setup. All of the logs seem fine. AF stays at 11.14 all the way to redline, there is no knock and I reached 20psi and tapered off to 14 by redline. The car doesn't sputter or anything it is still smooth but is just down a lot of power. I did the oil cap test and there was no smoke. I checked the MAF and it was clean. I have since received and loaded the first revision from Eric but it didn't help with power. I don't know where to look next. I really don't think it's a tune issue so far as I'm sure he would have said something wasn't right. What mechanically do y'all think I should check. On my previous stage 2 tune I was making ~315 hp and 340 ft/lbs. just adding the EBCS and TP Stage 3 tune it dropped to 230hp and 240ft/lbs on VD. I used the same road with the same starting point and temps were within 5 degrees of each other. I did have a walbro 255 in the car but on the first datalog Eric noticed it was running lean and told me to check the pump. I did so and it was cracked along the housing so I was forced to put the stock one back in. With the stock one as stated earlier it is staying in the target AFR all the way to redline.

The engine mods are as follow:
Cnt catless DP
Racer X FMIC
Aem CAI
Grimmspeed EBCS

I'm waiting on a replacement fuel pump to come in anyways just for security and I still have to put new spark plugs in this weekend. With that being said, could I be blowing my spark out at this level?

ANY constructive advise would be much appreciated.
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Last edited by rhinogt; 05-01-2013 at 03:09 PM. Reason: Typo
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Old 05-01-2013, 03:10 PM   #2
sultan81
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What is the DAM reading?
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Old 05-01-2013, 03:40 PM   #3
rhinogt
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I guess I should have pointed out that I am using OP not Cobb. My IAM value stays at 1.
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Old 05-01-2013, 04:10 PM   #4
the suicidal eggroll
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Quote:
Originally Posted by rhinogt View Post
AF stays at 11.14 all the way to redline
According to....the OEM sensor? I'm guessing yes since no tune ever made will stay at exactly the same AFR out to the hundredth decimal place all the way to redline. If it's the OEM sensor, then stop looking at it while in boost. It is USELESS in boost, it might as well just turn off. It will do nothing but confuse you and make you think that nothing is wrong when there could actually be a serious problem. When you're in boost, either look at the AFR from a wideband installed post-turbo, or don't look at the AFR at all.
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Old 05-01-2013, 04:21 PM   #5
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I perfectly understand what you are saying there. I know it is not an accurate indicator. I guess what I was trying to say is it's not going into the 12's or anything crazy like that. I figure the fuel pump is closed to maxed out now which I know it should be close hense I had an aftermarket one in there. I am currently waiting on the new one to arrive. However it doesn't make sense to me that I would lose power because of it, especially that much power. I would understand that I wouldn't make any more power if it were maxed out. And to clearify I was making 315hp and 340ft/lbs with the stock pump before. I only had the Walbro in the car for about a month.
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Old 05-01-2013, 04:26 PM   #6
the suicidal eggroll
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Quote:
Originally Posted by rhinogt View Post
I perfectly understand what you are saying there. I know it is not an accurate indicator. I guess what I was trying to say is it's not going into the 12's or anything crazy like that.
It could EASILY be in the 12s, and the stock sensor would still read 11.14. It's not that the stock sensor is inaccurate in boost, it's that it's WRONG. It will always tell you the AFR is 11.14 due to the pressure in the uppipe, when the actual AFR could be anywhere between 8 and 13.

Do not even LOOK at the stock sensor when you're in boost, it will never indicate a problem. Either get a wideband, or pray that your AFR is fine with no way to verify.
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Old 05-01-2013, 04:32 PM   #7
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Believe me I get what you are saying. I'm simply trying to say that the pump supported much more power before than what I have now. And unless there is something different about subarus than any other car wouldn't I be getting knock if it went that lean?
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Old 05-01-2013, 04:39 PM   #8
the suicidal eggroll
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Running lean will add power, not take it away, at least until you start detonating and the timing gets pulled. Since you don't have any pulled timing, I doubt you're running lean, but you could be losing the power from running way too rich.

Check everything that changed between the two tunes, and check for boost leaks. Also check your AFR corrections.

All I was pointing out is that the stock sensor reading 11.14 means less than nothing. It might as well read 3, or 52, because no number that is spit out from that O2 sensor is useful when the car is in boost. At least not until the AFR has gone WAY out of bounds.
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Old 05-01-2013, 04:43 PM   #9
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That is true I could be. I guess I need to pull a plug and see what it looks like. I have not noticed and smoke or odor from the exhaust though
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Old 05-01-2013, 04:44 PM   #10
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What would I be looking for on the AF corrections?
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Old 05-01-2013, 04:56 PM   #11
the suicidal eggroll
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AFR Correction and AFR Learning A-D should all be near 0, ideally within +/- 3%. If you're seeing big values, either positive or negative, it could indicate a problem (either mechanical or with the tune).

I'm not sure if Learning View supports the '12, but that would be the best tool to use.
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Old 05-01-2013, 05:20 PM   #12
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Ok well the AF corrections I logged are all at 0 except for right when I rolled on the throttle for 200 rpm it was -0.78
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Old 05-01-2013, 05:27 PM   #13
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^^ I think suicidal is looking for Long Term Fuel Trims here. As he indicated, running the Learning View utility is the most convenient way to get LTFT values (unless LV does not support your ECU...).
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Old 05-01-2013, 05:29 PM   #14
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I am going to try and run it here shortly.
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Old 05-01-2013, 07:00 PM   #15
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Ok so no dice on learning view, 2012 not supported. It does seem to be spooling 3-500 rpms later than before and there is a fluttering whistle coming from the turbo area now. I am not allowed to post attachments but I have a video that shows it
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Old 05-01-2013, 07:03 PM   #16
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Quote:
Originally Posted by rhinogt View Post
Ok so no dice on learning view, 2012 not supported. It does seem to be spooling 3-500 rpms later than before and there is a fluttering whistle coming from the turbo area now. I am not allowed to post attachments but I have a video that shows it
Boost leak?
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Old 05-01-2013, 07:06 PM   #17
rhinogt
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I don't know. It's at 20 psi by 3700. And it stays there until like 4400 so I'm not sure
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Old 05-01-2013, 07:30 PM   #18
the suicidal eggroll
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Quote:
Originally Posted by rhinogt View Post
Ok well the AF corrections I logged are all at 0 except for right when I rolled on the throttle for 200 rpm it was -0.78
You need these at idle and cruise, not WOT. They're based on the stock O2 sensor, and since the stock O2 is useless at WOT, so are the corrections. It sounds like you're just looking at AFR C as well, you need AFR L.
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Old 05-01-2013, 07:32 PM   #19
rhinogt
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I was looking at both but you are right I was looking at wot runs. Ill look at the low power logs and reply back
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Old 05-01-2013, 07:39 PM   #20
the suicidal eggroll
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AFRL shouldn't be zero unless you recently reset your ECU or flashed a new tune and haven't done any driving on it.
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Old 05-01-2013, 07:46 PM   #21
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I did. I haven't had a chance to put a lot of miles on it since
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Old 05-01-2013, 08:38 PM   #22
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What is your injector duty cycle?
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Old 05-01-2013, 08:59 PM   #23
rhinogt
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The hit 92-94 at redline. Yes I know that high and I was planning on injectors and a new tune with a wideband soon.
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Old 05-01-2013, 09:08 PM   #24
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Take it to someone who knows what they're doing...
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Old 05-01-2013, 09:23 PM   #25
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Thanks for that wonderful piece of insight. And I might if there was anyone around me who did.
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