i heard that STi had a problem with their pistons? - Subaru WRX Forum
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post #1 of 12 Old 05-19-2015, 05:15 PM Thread Starter
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i heard that STi had a problem with their pistons?

Many of indonesian subaru owner told that their sti suffered problem. And the problem is blown piston. Is it true that STi had that kind of problem?
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post #2 of 12 Old 05-19-2015, 05:33 PM
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Like ringland failure?

Shane
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2014 F150
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post #3 of 12 Old 05-19-2015, 09:40 PM
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I got you in the other thread, but yeah I think he's referring to ring land failure or rod failure

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post #4 of 12 Old 05-19-2015, 11:03 PM Thread Starter
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What is The best way to avoid ringland and rod problem?
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post #5 of 12 Old 05-20-2015, 02:17 AM
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run a conservative tune, drive safely and if you plan on pushing the car install appropriate upgrade parts.

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post #6 of 12 Old 05-20-2015, 06:11 AM
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Quote:
Originally Posted by arcticscythe View Post
run a conservative tune, drive safely and if you plan on pushing the car install appropriate upgrade parts.
Like what? I push it sometimes. I always thought the ring land thing was a 2.5L thing and not necessarily an STi thing. Regardless, everyone is gonna' spin a bearing, right? Even with a mild tune and the stock turbo at 118,000mi I feel like I'm driving a ticking time bomb. Right? All I can do is save up a butt load of money and wait for inevitable.Right?

All right, where is the distributor cap? I need to find the #1 plug wire to hook up my SUN machine.
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post #7 of 12 Old 05-20-2015, 11:37 AM
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Quote:
Originally Posted by Fidrat View Post
Like what? I push it sometimes. I always thought the ring land thing was a 2.5L thing and not necessarily an STi thing. Regardless, everyone is gonna' spin a bearing, right? Even with a mild tune and the stock turbo at 118,000mi I feel like I'm driving a ticking time bomb. Right? All I can do is save up a butt load of money and wait for inevitable.Right?
- exactly, and yeah the ring land thing is more commonly a 2.5 issue as far as I know. Keeping the knock to a minimum should help quite a bit.

I tend to drive like a grandma until I find a curvy stretch of road to open up on. Even them I am constantly glancing over at the accessport for Fine knock learning and feedback knock.

I think we are all riding in ticking time bombs, just some of us tend to upgrade before the first one explodes.

and to raymondkaliman, run it stock or tune conservatively and it will give you many happy years. I think that statistic is that 96% of all subarus built in the last 10 years are still on the road... Love its what make a Subaru a Subaru

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post #8 of 12 Old 05-23-2015, 02:12 AM Thread Starter
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Hahahaha so repalcing the oem piston with a forged piston could prevent the ringland rod failure? And i also read WOT in some website about subie what WOT stands for? )))
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post #9 of 12 Old 05-23-2015, 08:28 AM
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What appropriate upgrade parts are you talking about arcticscythe? I have a 2.0L and that's how I want it to stay. So, I'm not so worried about ringland failure but this bearing thing has me worried.Just to clarify...Its a rod bearing ,right? So, what happens? Does the rod come disconnected from the crank shaft and slap around sending metal chunks throughout the engine and all related parts? So, A full engine swap is the only fix only for it just to happen again in 150,000mi or less. I love my Subie and I'll do anything to keep it on the road but this sucks. Why did I bother getting the timing belt change if the engine is gonna' self destruct in 40.000mi or less anyway?

Oh well, I guess if I wanted a car that would last forever I'd have gotten a 98-01 Camry or a Corolla with a 5SFE engine in it.
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All right, where is the distributor cap? I need to find the #1 plug wire to hook up my SUN machine.
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post #10 of 12 Old 05-23-2015, 05:54 PM
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Fidrat I cant tell, gimme a sign. / sarcasm/

For op the issue youve come across is more than likley ringland railure where the piston heads cant handle the stress of knock events pushing the primary ring down against the slots on the side of the pistons. they crack and the free pison rings and rough piston edges do all sorts of damage to the cylinder walls. Upgrading pistons for harder forged pistons is a good first step but there is a tradeoff between harder materials that wear on the cylinder walls fater and softer ones that are less forgiving from a knock perspective.

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post #11 of 12 Old 05-23-2015, 07:30 PM
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Fidrat I cant tell, gimme a sign. / sarcasm/
Huh? Did I miss something? I don't get it. I guess I want to know what parts i need to prevent this. Or can an engine be built to avoid these problems?

All right, where is the distributor cap? I need to find the #1 plug wire to hook up my SUN machine.
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post #12 of 12 Old 05-26-2015, 02:22 AM
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Im sorry, I misunderstood, I took your question as sarcasm which it obviously was not. my apologies.

Yes forged pistons and a proper tune are a great place to start, The factory tune as far as I understand on the 2.5l in 20008-2011 was particularly lean near the top of the RPM range and it often caused knock that applied to great a pressure on the stock ring lands. Even with the stock tune. I would suggest tuning conservatively, leaning towards the richer end of the spectrum ( pardon the pun ) and if you have reason to open the engine then replace the stock pistons with a forged alternative.

And I have heard far fewer horror stories of ring land failure in the 2.0 so you should be just fine. Just make sure you get the grenade out of your up-pipe if you are so unlucky as to have one.

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