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Old 01-10-2017, 06:14 PM   #76
kris142b
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I had some issues with my SF as well. After the install my AF Corrections were up around 10 spiking into the 20s at cruise with my AFR spiking into the 17s. Took it off and everything is back to normal. I sent cobb an email, I anticipate they will just tell me my cars fxxx'd and not their product... Wondering if I should just send it back.

2002 wrx
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Old 02-05-2017, 10:26 PM   #77
csacharuk
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Quote:
Originally Posted by kris142b View Post
I had some issues with my SF as well. After the install my AF Corrections were up around 10 spiking into the 20s at cruise with my AFR spiking into the 17s. Took it off and everything is back to normal. I sent cobb an email, I anticipate they will just tell me my cars fxxx'd and not their product... Wondering if I should just send it back.

2002 wrx
Similar experience on my 2017 with the SF intake. Picked it up 2nd hand so I'm SOL in getting much support from Cobb. I ended up pulling it off after about 200 miles and reflashing to my MAP tune and everything is back on track.

Edit: Found out shortly after swapping it out that the numbers I was seeing for AF Learning were normal - I should have been monitoring my AFR numbers instead.

Last edited by csacharuk; 02-07-2017 at 03:43 PM. Reason: Added additional information
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Old 02-05-2017, 11:37 PM   #78
ericdet
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My tuner told me not to waste my money on it. In his words it just never scales out right and when it does he has to fix it 3 months later if you breathe on it.
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Old 08-06-2018, 11:45 AM   #79
SteelersNation7
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Quote:
Originally Posted by simpleJ View Post
Alright folks let's see if you are all having the same experience:

Installed the Cobb big SF and associated 93 octane map per the instructions exactly and have been having nothing but issues with the tune, which I believe is due to the scaling or turbulence in the intake.

-the filter was on the reccomended one inch, I then adjusted it to about 7/8 s of an inch which improved AF learning values to an acceptable range but not AFRs

-I put dielectric grease on the MAF cables

-I installed the coupler but fear it may be "backwards" although Cobb told me if it fit, it's on there correctly as it is not kinked or anything.

And onto the issue:

I was seeing wild AF learn values indicative of a leak, poor MAF scaling, or turbulence. This was ranging from +- 10 and spiking to about 15 in traffic. I adjusted the filter and saw a major improvement, values dropped to about +-6. However data logs on both show the car running lean as soon as soon as it hits open loop and pulls data from only the MAF.

AFRs spike at the open loop switch to about 12.3 then taper down to 11.3-12 when the car is targeting 11-11.6. In closed loop fueling is acceptable.

I played with the scales to no avail.

If I had a leak, in theory this should show more at idle where a 1 g/s leak should cause the ecu to add a significant amount more fuel than further up the rev range, instead the car is taking fueling out at idle, as much as -6% long term trim and a negative or near 0 short term trim. This tells me the metered air is less than the ecu is expecting, though my thought process could be erroneous here. If it was leaking it should be adding fuel to compensate at idle, one would think.

So, other owners and tuners, have you seen this issue?

Is it the coupler causing turbulence back to the MAF?

The Cobb map itself just not cleaned up enough?

A leak?

Or is the Cobb intake just a turbulent piece of junk?

Other mechanical issue?

Logs to follow


*Yes I know protune blah blah. I'm waiting for a GS TMIC. Also intake bro sounds, I'm aware. I know stock is suitable for power, but that's not as fun.
Iím getting similar problems if you by any chance read this can you reach out to me 5188481879
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Old 08-10-2018, 11:11 PM   #80
simpleJ
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The issue is the tune not the intake. Get a tune.
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Old 08-12-2018, 03:19 PM   #81
ToastyWRX
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Figured I'll post in here with my experience and update it every so often. It seems lots of people have issues with this intake.

So far I'm at around 1500 miles with this intake, a Grimmspeed Turboback/boost controller, TGV/EGR deletes, and FMIC. Protuned at 284whp/300tq on a Mustang Dyno.

No issues at all with my fuel trims. Do a 3rd gear pull onto the freeway just about every day. Multiple datalogs look great.

When I originally got the intake and used the OTS map with it, the fuel trims were all over the place and I was knocking at WOT consistently. Took it off and waited for the rest of the stuff for the protune.

It seems people have issues when they clean/adjust their filter. I'll update when I get to that point but so far it's working great. I think issues pop up with more aggressive tunes/e-tunes.
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Old 08-15-2018, 11:44 PM   #82
cky625
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So this is "the" post I should be reading.
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Old 08-16-2018, 08:16 PM   #83
subaru_gc8
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Quote:
Originally Posted by simpleJ View Post
Alright folks let's see if you are all having the same experience:

Installed the Cobb big SF and associated 93 octane map per the instructions exactly and have been having nothing but issues with the tune, which I believe is due to the scaling or turbulence in the intake.

-the filter was on the reccomended one inch, I then adjusted it to about 7/8 s of an inch which improved AF learning values to an acceptable range but not AFRs

-I put dielectric grease on the MAF cables

-I installed the coupler but fear it may be "backwards" although Cobb told me if it fit, it's on there correctly as it is not kinked or anything.

And onto the issue:

I was seeing wild AF learn values indicative of a leak, poor MAF scaling, or turbulence. This was ranging from +- 10 and spiking to about 15 in traffic. I adjusted the filter and saw a major improvement, values dropped to about +-6. However data logs on both show the car running lean as soon as soon as it hits open loop and pulls data from only the MAF.

AFRs spike at the open loop switch to about 12.3 then taper down to 11.3-12 when the car is targeting 11-11.6. In closed loop fueling is acceptable.

I played with the scales to no avail.

If I had a leak, in theory this should show more at idle where a 1 g/s leak should cause the ecu to add a significant amount more fuel than further up the rev range, instead the car is taking fueling out at idle, as much as -6% long term trim and a negative or near 0 short term trim. This tells me the metered air is less than the ecu is expecting, though my thought process could be erroneous here. If it was leaking it should be adding fuel to compensate at idle, one would think.

So, other owners and tuners, have you seen this issue?

Is it the coupler causing turbulence back to the MAF?

The Cobb map itself just not cleaned up enough?

A leak?

Or is the Cobb intake just a turbulent piece of junk?

Other mechanical issue?

Logs to follow


*Yes I know protune blah blah. I'm waiting for a GS TMIC. Also intake bro sounds, I'm aware. I know stock is suitable for power, but that's not as fun.
why did you need the big MAF? if you are running the stock turbo you dont need it. are you sure you're running the correct map? also can you post up the datalog that will help alot
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Old 11-10-2018, 11:25 AM   #84
scubie_craig
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Having the same issues (before) and after the Protune. I'm stripping the COBB intake off here shortly and I will be going back to the stock intake in hopes that things will rectify themselves. Tired of the drive-ability issues!

Really disappointed too, because I thought COBB was a great/reputable source for Subaru enthusiasts.
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Old 11-10-2018, 11:50 AM   #85
Stija
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Should have spent your money on something else that would work properly and add power. From what I understand they just make noise and cause issues, wouldn't put it on my car if they paid me instead of the other way around.

Also, both tuners I had conferred with alleged that it's not worth it and would cause problems. Now if the pro tuners think that, I can only wish you good luck with your issues and solving them. Play stupid games, win stupid prizes. There a lesson to be learned there somewhere.
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Old 11-10-2018, 11:56 AM   #86
jaredt3333
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I think I'm pulling mine off today too. AF learning hits -25% at idle and -10% cruising.
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Old 11-10-2018, 12:03 PM   #87
scubie_craig
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Quote:
Originally Posted by Stija View Post
Should have spent your money on something else that would work properly and add power. From what I understand they just make noise and cause issues, wouldnít put it on my car if they paid me instead of the other way around.

Also, both tuners I had conferred with alleged that itís not worth it and would cause problems. Now if the pro tuners think that, I can only wish you good luck with your issues and solving them. Play stupid games, win stupid prizes. There a lesson to be learned there somewhere.
I had this installed before my ProTune, and in my tuners defense, he said that he wouldn't have recommended the COBB one anyways. He said stock is fine, but if I had to choose, ETS it would be.
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Old 11-10-2018, 12:53 PM   #88
Stija
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That's why I annoyed my prospective tuner with questions before my tune to the point that he referred me t someone else to tune my car. Lol.

I still went with him in the end.
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Old 11-10-2018, 02:41 PM   #89
scubie_craig
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Quote:
Originally Posted by Stija View Post
Thatís why I annoyed my prospective tuner with questions before my tune to the point that he referred me t someone else to tune my car. Lol.

I still went with him in the end.
A tuner who isn't willing to take the time to answer your questions is an issue. That's the whole reason we use them! Glad that they worked with you though!
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Old 11-10-2018, 03:21 PM   #90
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Quote:
Originally Posted by scubie_craig View Post
A tuner who isn't willing to take the time to answer your questions is an issue. That's the whole reason we use them! Glad that they worked with you though!
A tuner who spends hours answering emails would rather be spending his/her time tuning. At the end of the day, the tunerís time is worth money. A big name tunerís time is worth even more and is less likely to answer all your questions. Itís a fine balance.
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Old 11-10-2018, 04:13 PM   #91
Stija
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Exactly and I had a 1001 and questions, sometimes same question from two different angles to see if I am getting the same answer. It worked out in the end though. And I don't blame him, I'm just stating facts. Time is money.
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Old 11-11-2018, 07:52 PM   #92
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Went back to stock intake today, fresh revised ProTune map, and I am golden. All issues are gone!
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Old 03-18-2019, 12:19 PM   #93
sublyme
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I have similar fuel trim issues. They seem to crop up after the tune has time to stabilize. Around 30-60 days after running. My AF correction drops to around -35 and af learning drops to around -15. (running rich)

My tuner advised that there is a leak somewhere but I have checked every clamp, replaced the MAF extension cable multiple times, tested the MAF and MAP sensors, and smoke tested this car at two different shops with no issues found. I am running the perrin inlet with nozzle going to a grimmspeed stealth box. My tuner advised that 15+ WRXs inlet is not under vacuum like most cars, so a vac leak actually leads to a rich code. The shops are baffled at this saying that does not makes sense.

Based on this thread, I am guessing the intake and/or inlet need to come off and stock parts need to go back on. Can anyone confirm the inlet is not under vacuum?

Last edited by sublyme; 03-19-2019 at 11:34 AM.
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Old 07-20-2022, 02:35 PM   #94
basyager
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ah BIG SF. I'm torn between taking it off and leaving it on..Maf scaling seems off -10-15% at light cruise but get closer to 0 with more load. wot afr seems good. but the car isnt entering OL at wot, idk why.
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Old 07-28-2022, 03:49 PM   #95
basyager
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FK.. after the 1000th time adjusting the filter and finally getting LTFT under control.. drove through some water, like 2 inches deep.. car started bugging out, idle correction jumped to -25%, car idles lean, 16:1 going as lean as 18:1 after I rev it, after I rev it, idle rpms drop below normal car shakes..
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Old 07-28-2022, 04:08 PM   #96
krahk
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Could be water or moisture in the MAF harness connector. The jumper harness is susceptible to moisture and corrosion. Pull the connector and check for water, blow it out, maybe even dry it if you can.
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Old 07-29-2022, 06:05 PM   #97
basyager
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0 faith in this extension harness., it all had to come off. First major rain and this happens. Feel scammed tbh.

Last edited by basyager; 07-29-2022 at 08:33 PM.
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Old 07-29-2022, 06:38 PM   #98
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Quote:
Originally Posted by krahk View Post
Could be water or moisture in the MAF harness connector. The jumper harness is susceptible to moisture and corrosion. Pull the connector and check for water, blow it out, maybe even dry it if you can.
yeah I checked there was MAAAAAYBE a tiny bit, I blew it out it didnt work. This is a joke. I powerwash under the hood and oem plugs never have any issues. I thought Cobb made quality products turns out its overpriced junk.

Last edited by basyager; 07-29-2022 at 06:54 PM.
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Old 08-08-2022, 12:26 PM   #99
Apharmd
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I'm pro-tuned with this intake and late last week I got the p0172 CEL. Had a perfect storm of very hot/humid day, fresh tank of gas, and a big thunderstorm soaking everything. My AF Learning/AF Correct were way into the negative, rough idle and hesitation. I cleared the code and engine learning, and it's running better, but AF Learning is still around -17. WOT AF Correction 1 is fine but at idle it's way off. I'll take my intake apart, clean the filter and MAF sensor, check the harness for water, and see if it resolves itself before I take it back to my tuner for maintenance.

Wish I had seen this thread prior to getting Cobb's intake for my WRX. I knew that these intakes were touchy but I figured with a pro-tune I'd be fine long-term.
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Old 08-19-2022, 03:35 PM   #100
Apharmd
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*double post*

Last edited by Apharmd; 08-19-2022 at 03:37 PM. Reason: double post
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