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Old 04-04-2017, 08:55 AM   #1351
That_Boosted_Life
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Originally Posted by Mercs View Post
Has anyone had a '17 motor fail? Little worried after reading this thread about the fa motors.
If you notice a good number of them are the 2015's as the majority of them came with a faulty tune from the factory which caused them to knock a lot. Not too many 2016 have failures compared to 2015's. The 2017 are only just about a year old come summer so you won't see as many failures as older models as they haven't had time to rack up the miles and abuse.
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Old 04-04-2017, 09:15 AM   #1352
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Am beginning to wonder just how much immaturity of the platform and tuning inexperience plays into this failure rate.
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Old 04-04-2017, 09:36 AM   #1353
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Am beginning to wonder just how much immaturity of the platform and tuning inexperience plays into this failure rate.
This, it was a learning experience for aftermarket manufacturers and tuners and hell, even Subaru seeing as they had the pre-ignition recall.

Not only that but the early adopters jumped on the 2015 WRXs and started tinkering with things almost right away.

Around the time the 2016s came out, people figured out the limits and how to tune and mod these.

THAT is the reason, not because the 2017s are better than the 2015s, they're exactly the same in terms of hardware.
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Old 04-04-2017, 11:40 AM   #1354
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It doesn't seem that many are blowing up outside the US either.
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Old 04-04-2017, 11:53 AM   #1355
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Well this is a north american forum and most Canadians don't even know about this site. We're just not hearing about it. Regardless, failure rate is low.
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Old 04-04-2017, 12:48 PM   #1356
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Ecu and ecu logic are also improved for 2016+
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Old 04-04-2017, 12:57 PM   #1357
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Ecu and ecu logic are also improved for 2016+
Someone correct me if I am wrong but I believe the logic was factory changed beginning with 10/14 and up production dates, that is why they were not included in the recall.

Also, having driven an earlier built 2015, it felt nothing like the later 2015 models (it actually felt much faster down low).
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Old 04-04-2017, 01:20 PM   #1358
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Yes but I believe they took it and ran with it and ran a faster ecu with different logic after that.

That's why 2015 maps are v301 and 16/17 are v302 I believe
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Old 04-04-2017, 05:28 PM   #1359
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Has anyone had a '17 motor fail? Little worried after reading this thread about the fa motors.
Expect modified 2017 WRXs to fail in the same manner and rate as 2015 and 2016 WRXs. Nothing internally in the motor has changed as far an anyone knows. Keep with power below 300whp/wtq and you'll probably be fine, though, you'd be much safer running stock.

If you bought this car thinking you can safely and reliably add 20%+ power, you bought the wrong car. The ECU is not that advanced, the safeguards minimal, and the motor is relatively cheap, simple, and not overly strong to handle a lot more power than stock.

Most everyone swore that the FA20DIT was the Second Coming and that the days of modified turbo Subaru failures were over. That song was sung for about the first year the car was out. Now it's pretty clear that they blow up about as easily as the EJ25. Basically every "tuner" in this FA forum has blown up one of their own FA WRXs.

Does this mean the motors suck? Not all. It's a unique and good motor in a $25K sporty car. And Subaru didn't design the motor with the intention of supporting anyone's desire for power modifications.
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Old 04-04-2017, 05:28 PM   #1360
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There has been 70k wrx and sti sold since the 15 came out. 3 out of 5 are prob wrx. So out of 40k fa20dit I'd say there's no problems. How many failures total now on this thread? 30?
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Old 04-04-2017, 05:58 PM   #1361
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nevermind I should pay better attention.
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Old 04-04-2017, 06:21 PM   #1362
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Maddmax, I mean... I don't disagree entirely but manufacturers and engineers design/build with safety factor, sometimes higher than needed. Seems these engines can make up to 350 wtq relatively safe. These motors are great but like any mechanical device, it can fail when being abused.
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Old 04-05-2017, 01:12 AM   #1363
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Originally Posted by That_Boosted_Life View Post
I haven't built my motor, but the most common way the FA motor fails is by throwing a rod. When this happens, it takes the case halves, and most likely the cylinder head with it. Not sure what the cost of a cylinder head is (new or used), but I bet they are around $500 each.
Sounds expensive. I'll probably going route B
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Old 04-05-2017, 12:42 PM   #1364
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Originally Posted by weaverfever View Post
There has been 70k wrx and sti sold since the 15 came out. 3 out of 5 are prob wrx. So out of 40k fa20dit I'd say there's no problems. How many failures total now on this thread? 30?
Not to mention how many were crib-deaths. Either faulty parts or people trying to tune a new engine or both (we'll never know).
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Old 04-05-2017, 01:32 PM   #1365
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So built shortblock will keep the expensive heads intact. Good to know. Thanks, I learn a lot here.
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Old 04-05-2017, 01:49 PM   #1366
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Originally Posted by playslikepage71 View Post
Not to mention how many were crib-deaths. Either faulty parts or people trying to tune a new engine or both (we'll never know).
Yep. Or just bad tunes and driver abuse in general.

Considering all of that... the amount of stock cars and properly modified and well tuned cars blowing up while "I was just driving normally, I never drive the car hard I swear", is a pretty small number.

It's basically the same story for the EJ. I know of several cars first hand with 60k+ miles, modified and tuned and stock internals/head and zero issues. One of those cars is now making 390 ft lbs of TQ at the wheels on Flex Fuel. But they've all been modified with quality parts, installed and tuned by professionals and always maintained with quality fluids etc.

Also There's a difference between driven hard and abused.

Last edited by VanWo; 04-05-2017 at 01:54 PM.
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Old 04-05-2017, 03:26 PM   #1367
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I'm still waiting for someone to be the guinea pig and swap the rods without building the whole block.
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Old 04-05-2017, 03:28 PM   #1368
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I'm still waiting for someone to be the guinea pig and swap the rods without building the whole block.
That's... building a block.
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Old 04-05-2017, 03:35 PM   #1369
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That's... building a block.
I meant keeping everything else stock.

Someone also mentioned you might be able to swap rods without splitting the block open
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Old 04-05-2017, 03:39 PM   #1370
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Quote:
Originally Posted by Sillo View Post
I meant keeping everything else stock.

Someone also mentioned you might be able to swap rods without splitting the block open
I was looking into this but got sidetracked by air ride.
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Old 04-05-2017, 03:47 PM   #1371
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I meant keeping everything else stock.

Someone also mentioned you might be able to swap rods without splitting the block open


How?????
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Old 04-05-2017, 03:57 PM   #1372
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I meant keeping everything else stock.

Someone also mentioned you might be able to swap rods without splitting the block open
uhh...wow
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Old 04-05-2017, 04:05 PM   #1373
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How?????
https://forums.nasioc.com/forums/showpost.php?p=44981163&postcount=40

No idea how feasible it actually is.
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Old 04-05-2017, 04:25 PM   #1374
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Originally Posted by Sillo View Post
https://forums.nasioc.com/forums/showpost.php?p=44981163&postcount=40

No idea how feasible it actually is.
i saw that post as well. waiting to see someone try it first.... but i would love to be able to upgrade my rods without ripping apart my engine.
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Old 04-05-2017, 04:29 PM   #1375
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https://forums.nasioc.com/forums/showpost.php?p=44981163&postcount=40

No idea how feasible it actually is.
I'm in agreement with fl1p on this one. I guess if you pop out the wrist pin, push the piston up to TDC, unbolt the rod from the crank, maybe???

Sounds like doing surgery while holding the scalpel with your buttcheeks though.
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