[BrassKnuckles]

I am considering buying a Cobb AP for my 2017 WRX but I want to understand what I am getting into. I want it because I have read it helps with overall performance and a few other benefits such as valet mode(?). If I buy one, what are the cons that i need to be aware of?

I am expecting this will get rid of rev hang and will make it a noticeable mod. I am not expecting a brand new car but I am expecting to feel the benefits of having it when i drive. I know ill need to download a map for whatever octane gas ill use in my area. I am also expecting that I need to mount it and run a wire somewhere? What other benefits am I missing?

What are the cons to be aware of? Dealer wont be happy? I risk blowing up my engine (joke)? I know if I continue down a path of other mods then I start to really put my engine at risk so i am going for a basic improvement thats safe and warranty friendly.

I appreciate the help.

 

[XJman]

I don't see an advantage in having a $700 target mounted in my car for it to be stolen. Flash your tune, put it away.

Stage 1 I've read conflicting reviews. You will have to try it. There is the possibility after flashing the map that if you have an engine problem warranty coverage will be denied. So keep that in mind

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[lkp730]

Just installed AP on stock 2017 wrx. It feels like it lost that kick after 2500 rpm for some reason. Did one run and noticed knock on 1st gear as well. Not liking this and thinking about uninstalling it. Will give it a few more days to know for sure...

To make things worse, was researching the AP and found a thread about 2015 wrxs and blown motors...

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[nsibanez]

Just installed AP on stock 2017 wrx. It feels like it lost that kick after 2500 rpm for some reason. Did one run and noticed knock on 1st gear as well. Not liking this and thinking about uninstalling it. Will give it a few more days to know for sure...

To make things worse, was researching the AP and found a thread about 2015 wrxs and blown motors...

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You should link your sources

And you sure you're reading your logs right? Some knock is normal and fine depending when

 

[XJman]

The only failure I've seen on the fa20f is rod failure and that's not until notable HP gains.

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[irickchad]

LKP730, You started noticing knock on an engine you previously weren't even monitoring for knock, lol. Subaru engines are notorious for knock, and will hit -2.80 fairly regularly. Often higher on stock tunes, but the numbers will vary.



BrassKnuckles, the only real con you're going to run into is possible warranty claim denial if you have a catastrophic mechanical failure directly related to the fact that your car was tuned.

 

[lkp730]

https://forums.nasioc.com/forums/showthread.php?t=2749732
15+ blown motor roll call

Irickchad you might be right that I've never noticed knock but I don't think I ever heard knocking on my 2017 wrx before. Maybe because I didn't listen for it but after installing and doing a run it was very apparent. 2nd run was clear of knock though. Maybe the engine corrected itself?

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[Goose42]

^ How many miles since you flashed it?

 

[lkp730]

About 6500 miles

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[Goose42]

About 6500 miles

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You said you just installed it, you have already driven 6,500 miles on the OTS tune?

 

[lkp730]

No I meant that I had 6500 miles. I installed yesterday and have about 20 miles give or take.

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[Goose42]

Give it time to adjust, and monitor. Start a new thread and post a log if you have concerns regarding what you are seeing(knock events).

 

[lkp730]

Will definitely do. Thanks

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[Whitefang]

Also that loss in kick... The ots map you put just smoothed out the powerband. Run a log and see if you're hitting correct boost. I had to use the HWG map because I wasn't hitting target boost

 

[nsibanez]

Everyone complained about the loss of kick. It's a more linear curve iirr, but still more power

 

[irickchad]

You're not going to HEAR feedback knock unless it's really bad.

If you're driving down the highway and your car is knocking at -4.20 the whole way, you're not going to hear it.

Knock sensors may, you will not. If you hear knock, it's time to rebuild, lol

 

[Raven Logics]

LKP730, You started noticing knock on an engine you previously weren't even monitoring for knock, lol. Subaru engines are notorious for knock, and will hit -2.80 fairly regularly. Often higher on stock tunes, but the numbers will vary.

+1

The Stage 0 map is supposed to mimic the stock tune. I have one of the earliest 2015's and it has some occasional high knock figures on Stage 0, as well as with the OTS Cobb maps. I rarely see any knock on a custom 94 octane tune whenever I run a log.

The 2015 motor failures are not necessarily Cobb related, though some of those listed have been modded and pushed beyond a basic tune. All brands have a certain percentage of components break under warranty, but it usually is just bad luck or pushing the tune too far (imho). If you are worried about the engine blowing then you should wait for the warranty to expire. Personally I like the quicker throttle response, lower rev hang, linear power throughout the entire usable range (it tails off too early on the stock map), and to top it all off less knock! I don't have any payments on my car though, and can afford a new engine if something goes wrong.

 

[lkp730]

Wondering if the older wrx had a stronger engine

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[XJman]

No. The ej was prone to piston failure and there are plenty of accounts of low mileage engines that have died.

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[goodysgotacuda]

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