The poor 2.5 Hatch Engine
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From: 32 cylinders and many cats
There is so much going for 2.5 Subarus, they have great suspension and brakes for the road, reasonable refinement, lots of tuning parts, lots of ECU options, plenty of spares available, but I wouldn't have another with an EJ257 as whilst I like the way it drives very much, I got fed up of pulling them out to fix them. To me, a piston change on an engine like this is polishing a turd, you don't solve all the issues and are maybe taking your safe headroom from 360 to 450 BHP.
Change the rods on a 4G63 without even removing the engine from the car (Norris were doing it for a grand) and you take your safe limit from about 420 to 600 BHP.
Change the rods on a 4G63 without even removing the engine from the car (Norris were doing it for a grand) and you take your safe limit from about 420 to 600 BHP.
Last edited by john banks; Oct 18, 2012 at 04:55 PM.
To OP
There is a stigma attached to the 2.5 because it is a real issue
( yes I'm a owner )
If you had indeed done your research you would know that the 2.5 ej257 has several issues regarding strenth / tolerances per sa
From thin liners to h/g to ringland - / I'm sure your right in saying not all will fail but if you look world wide to include North America & Australia as this is the market the 2.5 was initially developed for you would see a figure of around 20% failure across the board / now if your telling me a 20% failure rate is acceptable from a motor manufacturer then your smoking something you shouldn't be / plain & simple the 2.5 will fail if boost is raised / red lining is common & water temps arnt taken note / saying that once issues are addressed its a beutifull engine with torque from the outset .
Regards
There is a stigma attached to the 2.5 because it is a real issue
( yes I'm a owner )
If you had indeed done your research you would know that the 2.5 ej257 has several issues regarding strenth / tolerances per sa
From thin liners to h/g to ringland - / I'm sure your right in saying not all will fail but if you look world wide to include North America & Australia as this is the market the 2.5 was initially developed for you would see a figure of around 20% failure across the board / now if your telling me a 20% failure rate is acceptable from a motor manufacturer then your smoking something you shouldn't be / plain & simple the 2.5 will fail if boost is raised / red lining is common & water temps arnt taken note / saying that once issues are addressed its a beutifull engine with torque from the outset .
Regards
1 in 5 engines popping is unacceptable, hence the reason why people say its made of chocolate.
Would 1 in 5 pop if they were all standard as per manufacturers spec & serviced as per manufacturers guidelines?
Completely agree with you TT, just wondering what the actual percentage of those failures were modified.
Completely agree with you TT, just wondering what the actual percentage of those failures were modified.
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And always run on 99ron fuel and not bounced off the limiter. I have seen plenty of Impreza's queing up at sainsburys ready to fill up with that cheap junk. Not sure many would admit to it after the engines gone pop.
Yep, couldn’t agree more!
As Duncan told me, the standard “fits all” map from Subaru is terrible really. It’s more than likely map related issues that can kill an engine. If possible always get a bespoke map done for your performance car so that it reads all the sensors correctly. Just like calibrating the engine to use all of its own correctly and making it work how it should.
As Duncan told me, the standard “fits all” map from Subaru is terrible really. It’s more than likely map related issues that can kill an engine. If possible always get a bespoke map done for your performance car so that it reads all the sensors correctly. Just like calibrating the engine to use all of its own correctly and making it work how it should.
Chopperman Where is your evidence that sainsburys SUL is so bad. Mine has been run on it from new and has always ran the very best and no issues.
Last edited by scooby1929; Oct 18, 2012 at 05:42 PM.
I've always used that Sainsburys 'cheap junk', never had a problem with it.
Ran an MY02 PPP'd STI on it for 3 years, a PPP'd MY05 STI on it for 2 years, followed by another 3 years on an Andy F remap.
was your car mapped for it though?
i thought sti imprezas need minimum 98 ron and in the uk the only fuel over this is tesco momentum and v power ( i know your from ni)
my sti has a warning sticker in the fuel flap stating 98 ron fuel
Last edited by tubbytommy; Oct 18, 2012 at 05:47 PM.
Its 97 ron which is the most we can get here in N.Ireland as far as i am aware. I have hit 10 years of scooby ownership this month and always used sainsbury sul and never had an issue
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I think my point has just been proved in the posts above. my evidence is the Ron rating of sainsburys SUL only being 97. A standard mapped STi 2.5 requires 98ron minimum. To add further to my comment about seeing plenty of impreza's filling with sainsburys junk. A) i have seen plenty filling up with the 95ron rather than the 97ron sul which is still less than required. B) my misses little jazz does about 5mpg less on sainsburys fuel than it does on Texaco or shell 95 indicating a low calorific value .
Last edited by chopperman; Oct 18, 2012 at 06:03 PM.
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Agreed m8 just seen a 12 plate sti filling up on unleaded watching me fill up with v power and smuggly stating i'm not paying the extra for that it'll run just as well on normal unleaded oH DEAR
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When i got my car mapped by simon jgm he asked me what fuel i was using and i can remember him saying that it must of been good stuff as my car was putting out some really good figures
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Your car has now been mapped by JGM on that fuel so iom sure it will be fine. I very much doubt they would have just ragged your car on that fuel to see if it was ok and not detting. Most put a base map on then start mapping from scratch at different levels of boost.
Last edited by chopperman; Oct 18, 2012 at 06:22 PM.
I have not seen or heard of that rating before. I thought all uk cars had to meet a rating of 95 ron
So Subaru produce a car for the UK and put a sticker on it saying you must use a min of 98 ron but here in northern ireland (part of the UK) we can only get a max of 97 ron??
So Subaru produce a car for the UK and put a sticker on it saying you must use a min of 98 ron but here in northern ireland (part of the UK) we can only get a max of 97 ron??
Last edited by scooby1929; Oct 18, 2012 at 06:38 PM.
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My wifes car does 5mpg LESS on sainsburys fuel than it does no non supermarket fuel indicating low calorific value , hence its ****e !
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I have not seen or heard of that rating before. I thought all uk cars had to meet a rating of 95 ron
So Subaru produce a car for the UK and put a sticker on it saying you must use a min of 98 ron but here in northern ireland (part of the UK) we can only get a max of 97 ron??
So Subaru produce a car for the UK and put a sticker on it saying you must use a min of 98 ron but here in northern ireland (part of the UK) we can only get a max of 97 ron??
Thread Starter
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From: Cambridge
You only ever hear about the bad ones never the good ones.
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Because cosworth mapped them for 97ron. As far as i am aware all the uk 2.5 STI on the standard maps require 98 or above. It would seem many owners feel 97 or even 95ron is fine. They think this because of a misguided belief that all uk cars have to be able to run on 95ron to be sold in the uk or they are just so penny pinching they will risk their engines for a few pence per litre.
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From: north east
you need something like this.................
http://www.facebook.com/photo.php?fb...type=1&theater
alyn
http://www.facebook.com/photo.php?fb...type=1&theater
alyn
Got a 2.5 in mine which is mated to v5 Sti heads, standard block which was brand new and mapped straight away, got to be about 20k now of 353/380 and a few thousand at 370-390-410 and not a problem so far, probably just jinxed it though
Last edited by chrispy200+; Oct 18, 2012 at 07:14 PM.
Well then i am happy to hold my hand up and say i was wrong but producing a car that requires 98 ron fuel for this part of the uk that can only get 97 ron is ridiculous.
Subaru have lost the plot no wonder so many have went bang.
I remember back in the late 90s all the jap imports were coming into ireland using 100 ron in japan and then people here were running then on ordinary unleaded 95 ron and they were all going bang
Subaru have lost the plot no wonder so many have went bang.
I remember back in the late 90s all the jap imports were coming into ireland using 100 ron in japan and then people here were running then on ordinary unleaded 95 ron and they were all going bang
