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Old 02-13-2018, 05:37 PM   #1401
Fierysun
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Originally Posted by heavyD View Post
Never mind the hundreds/thousands of engines that have been replaced on Subaru's dime since 2008.
Subaru is notorious for having questionable oem map/tunes (detonation) which resulted in these and other issues. Which is resolvable with a solid aftermarket tune, but really should be done right at the factory. Stronger pistons only makes it's it more tolerate of detonation.
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Old 02-13-2018, 08:18 PM   #1402
STI2005
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Originally Posted by Barry View Post
Guy I know was just told his car is on March allocation and is due for April delivery
Interesting.. I was advise that they will be all arrived in Canada by the end of March... nothing about delivery yet...
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Old 02-13-2018, 10:11 PM   #1403
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Originally Posted by Fierysun View Post
There's a misconception the stock pistons are "weak".
They break on the stock tune. While they may not be "weak" on a proper tune, they simply aren't strong enough. This is not a misconception. Do you see how many people break ringlands?
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Old 02-13-2018, 10:44 PM   #1404
Fierysun
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Originally Posted by SoapBox View Post
They break on the stock tune. While they may not be "weak" on a proper tune, they simply aren't strong enough. This is not a misconception. Do you see how many people break ringlands?
The problem is the factory tune. If the engine is experiencing detonation, it'll destroy not just the pistons (forged also), but the rings as well. With that being said, I personally wouldn't run a Subaru hard on a factory tune and I only go to a tuner I trust.
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Old 02-14-2018, 12:13 AM   #1405
thenoodler
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Originally Posted by Fierysun View Post
Subaru is notorious for having questionable oem map/tunes (detonation) which resulted in these and other issues. Which is resolvable with a solid aftermarket tune, but really should be done right at the factory. Stronger pistons only makes it's it more tolerate of detonation.
Right, because some “dude” from a shop is far more knowledgeable about how to tune the engine safely, than the engineers at Subaru. It couldn’t possibly be due to people make modifications to their cars...
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Old 02-14-2018, 12:36 AM   #1406
JustyWRC
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Quote:
Originally Posted by heavyD View Post
Never mind the hundreds/thousands of engines that have been replaced on Subaru's dime since 2008.
A lot of good will in there.....

Quote:
Originally Posted by Barry View Post
Guy I know was just told his car is on March allocation and is due for April delivery
Yep. Been like this for a while.
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Old 02-14-2018, 08:31 AM   #1407
SoapBox
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Originally Posted by thenoodler View Post
Right, because some “dude” from a shop is far more knowledgeable about how to tune the engine safely, than the engineers at Subaru. It couldn’t possibly be due to people make modifications to their cars...
It's not that simple...

Of course Subaru knows how to tune an engine safely. The problem is, modern emissions standards.

In order to get the aging EJ past ever-tightening emissions standards, it's well-known that Subaru has been forced into tunes I'm sure they'd prefer not to use. Started back in 2005 with the OL/CL fueling delays, and has continued since. The tune was lean enough, and the newer pistons weak enough, that in 2011ish they started having problems breaking pistons on stock motors, which they didn't use to do with regularity.

It's really hard to avoid knock on an over-square, port injection engine while meeting today's emissions regs.

A tuner, however, has no such regulations to meet. They can let the motor go open-loop much sooner, they can richen the motor up all over the place without any emissions worries. They have MUCH more flexibility with their tunes to keep knock at bay.

Now granted, of course increasing power lowers reliability too. And I'm not one to say a typical stage 2 tune is "safer" than the stock tune as many do. But I would say that a tuner can probably do some minor things to the stock maps, leaving boost and timing alone, in order to make the motor less detonation prone.

Last edited by SoapBox; 02-14-2018 at 08:50 AM.
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Old 02-14-2018, 08:45 AM   #1408
SoapBox
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This isn't a bad read which explains some of the potential causes of issues, including the tune, newer piston designs, driver factors, etc. A main theme is that the EPA is more to blame for ringland failures than Subaru is.

https://www.igotasti.com/vBforum/thr...our-WRX-or-STI
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Old 02-14-2018, 01:11 PM   #1409
Julia
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Yep. Been like this for a while.
I've been told April as well. Are they pretty much all being delivered in April?
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Old 02-14-2018, 01:47 PM   #1410
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I've been told April as well. Are they pretty much all being delivered in April?
I'm sure a few will trickle to the high volume dealers a little earlier than others; but, yes. That's what I think.
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Old Today, 09:52 PM   #1411
2toxic
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Any word on the pistons alloy or part numbers, can you buy a short block with this new pistons?
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