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2016+ WRX STI

Old 17 April 2019, 01:32 PM
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Matt_STi
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Default 2016+ WRX STI

Haven't been on here for a very long time, sold my 2005 STI few years ago but looking to get another Subaru. This time I'm looking at the newer WRX STI.

I remember the 2.5 engine had issues on the hawk eye, does the new style Subaru have the same issues does anyone know?

Is there anything I should look out for when viewing one? Other than the obvious.

Thanks
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Old 17 April 2019, 01:35 PM
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Tidgy
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yep, same crappy 2.5
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Old 17 April 2019, 01:35 PM
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Originally Posted by Matt_STi View Post
Haven't been on here for a very long time, sold my 2005 STI few years ago but looking to get another Subaru. This time I'm looking at the newer WRX STI.

I remember the 2.5 engine had issues on the hawk eye, does the new style Subaru have the same issues does anyone know?

Is there anything I should look out for when viewing one? Other than the obvious.

Thanks
Yes same ****e engine, buy a cheap one out of warranty and have it forged by a reputable specialist and then enjoy it.
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Old 17 April 2019, 01:46 PM
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Ok thanks, how much would I be looking to get it forged?
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Old 17 April 2019, 01:48 PM
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the shreksta
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Originally Posted by Matt_STi View Post
Ok thanks, how much would I be looking to get it forged?
Around 4k-5k but well worth it, the 2.5 is a cracking engine for fast road use when built properly.
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Old 17 April 2019, 01:52 PM
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Hmm that's quite a bit considering the car would be expensive too. Obviously long term well worth it, but something to consider.

Is it a general issue or more a issue if you increase the bhp?
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Old 17 April 2019, 02:08 PM
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Originally Posted by Matt_STi View Post
Hmm that's quite a bit considering the car would be expensive too. Obviously long term well worth it, but something to consider.

Is it a general issue or more a issue if you increase the bhp?
It's just a flawed engine mate, it's more a case of when not if. Some people have had 0 issues and some people have had engines fail with less than 10k on them.

If you buy one just have a slush fund ready just incase, the rest of the car is pretty much bomb proof it's just the engine. You may find a rebuild for about 3.5k but remember that cheaper doesn't mean better.
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Old 17 April 2019, 02:12 PM
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Glad I asked. May have to think of a different car completely as this will be my car for a very long term.

Shame as I love the new versions. Sadly I'd only have enough for the car but not the extra.

Thank you all
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Old 17 April 2019, 02:15 PM
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Would it be possible to buy forged pistons online which would solve it?

I'm fully crap when it comes to engines and any knowledge on it
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Old 17 April 2019, 04:11 PM
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Originally Posted by Matt_STi View Post
Would it be possible to buy forged pistons online which would solve it?

I'm fully crap when it comes to engines and any knowledge on it
Will need honing for the change in pistons anyway so just not worth it. If your gonna do it, do it right.

Even with its faults i love the 2.5 as a road engine, when its built right. more usable and nicer to drive than the 2,0 imo as you dont have to rev the **** off it and they don't have anywhere near the lag of the 2.0.
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Old 17 April 2019, 04:14 PM
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Due to the ever tightening Uk/Euro emission limits the 2.5 has suffered from having to use hypereutectic alloy pistons (low expansion rate) to obtain the reduction in piston skirt to liner clearances required to meet them.
Because of this, ringland failure can occur, if not run in sympathetically, or when higher loads are place on the pistons when power is increased significantly.

Fitting forged pistons can solve this problem but in reality requires the engine to be dismantled to get the correct clearances for forged pistons which have a higher expansion rate and need bigger clearances.
Raising the power /torque can also cause the head bolts to stretch leading to head gasket failure. These should be replaced by ARP or other brand of head studs to improve head to block clamping pressure.

Last edited by Don Clark; 17 April 2019 at 04:15 PM.
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Old 17 April 2019, 05:01 PM
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Just noticed there is a 64 plate on trader think 25k miles just had 4900 Engine rebuild.....
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Old 17 April 2019, 05:19 PM
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Originally Posted by Andycat View Post
Just noticed there is a 64 plate on trader think 25k miles just had 4900 Engine rebuild.....
Thanks, will look. Haven't got the money quite yet, wanted to do my research first! Hope it's still around
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Old 17 April 2019, 06:53 PM
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Does anyone know the actual percentage of the 2.5l engines, that are untouched by any modding or power increases, that pop? Be interesting to see the actual percentages.
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Old 17 April 2019, 06:57 PM
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Originally Posted by Fishbowlhead View Post
Does anyone know the actual percentage of the 2.5l engines, that are untouched by any modding or power increases, that pop? Be interesting to see the actual percentages.
i;ve heard figures from 30% to 50% mentioned but highly unlikley to ever get an accurate figure. Subaru UK have always denied there is an issue, even though i believe subaru US has now.
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