2008-2010 2.5ltr Engine Failures
05 January 2011, 11:14 PM
#332
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outa intrest if they did say Ok guys lets recall you all and fit forged piston, do you think that it would be put to bed, or do you think there is still a design issue with the block ?
I rem Ali on here saying even with forged pistons a **** map will blow anything.
we have 2 factors here Map and Pistons, correct piston, map still crap, piston Pops under heat.
correct Map, piston forged or not will survive, Forged obviously better.
or do we all think that there is a deeper issue.
maybe people Like Alan or other engine guys can answer it. I know they said they thought it was Pistons, But look at it this way, a piston is Visible damage thus instanly you point the finger
but there are reasons a Piston can blow other than **** material, maybe that was or is the root cause ?
Can anybody voice that the remap done in 2009 only changed the limiter ? or did some other numbers change ?
also in the older Scoobs were they forged or have they always done chocolate ?
I rem Ali on here saying even with forged pistons a **** map will blow anything.
we have 2 factors here Map and Pistons, correct piston, map still crap, piston Pops under heat.
correct Map, piston forged or not will survive, Forged obviously better.
or do we all think that there is a deeper issue.
maybe people Like Alan or other engine guys can answer it. I know they said they thought it was Pistons, But look at it this way, a piston is Visible damage thus instanly you point the finger
but there are reasons a Piston can blow other than **** material, maybe that was or is the root cause ?
Can anybody voice that the remap done in 2009 only changed the limiter ? or did some other numbers change ?
also in the older Scoobs were they forged or have they always done chocolate ?
In an attempt to make the Hatch a more "modern" contender in the New Green Era, Subaru have aggressively gone for a particular strategy with the ECU. This is combined with a generally higher CR than previous offerings.
The piston choice is based on a number of factors, including longevity (!) and nicely quiet warm up characteristics.
The problem is, it doesn't add up properly. Ying has been usurped by Yang.
Fitting a stronger piston appears to fix the land breakage issue.
We prefer to tackle it from several angles. Forged Pistons of course, but with a lower CR, and tackling the worst aspects of the Samurai mapping.
The result appears to be a reliable, faster and better car.
Less Green but who gives a ....
06 January 2011, 11:10 AM
#333
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Tedlittle
Yes I think you've got it - a mixture of poor mapping (crazy timing and afr ratios), with inferior piston material has blighted these engines...
I do hope yours lasts, as its a pretty crap thing when it happens... I mean they 'may' offer to rebuild it exactly the same as before... and that changes nothing.
Careful driving will help, but a remap by a professional mapper will hopefully ensure longevity at the sake of losing the warranty...
What a shtie decision to have to face with a new car.
All the best
A
PS. they're are 'far more knowledgable' opinions than mine on here - save up for a trip to devon and you wont go far wrong. With a very, very, safe 365/430 I am loving my car, but the £ x costing was unwanted - unexpected - & unbloody fair... I'm still paying it off.
Yes I think you've got it - a mixture of poor mapping (crazy timing and afr ratios), with inferior piston material has blighted these engines...
I do hope yours lasts, as its a pretty crap thing when it happens... I mean they 'may' offer to rebuild it exactly the same as before... and that changes nothing.
Careful driving will help, but a remap by a professional mapper will hopefully ensure longevity at the sake of losing the warranty...
What a shtie decision to have to face with a new car.
All the best
A
PS. they're are 'far more knowledgable' opinions than mine on here - save up for a trip to devon and you wont go far wrong. With a very, very, safe 365/430 I am loving my car, but the £ x costing was unwanted - unexpected - & unbloody fair... I'm still paying it off.
07 January 2011, 09:01 AM
#334
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We shouldn't have to nurse a performance car. The performance we pay for should be usable IMO. Pity really, because I really like the hatch.
Lee
Lee
07 January 2011, 10:03 AM
#336
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sexy!
offtopic;
i heard there is a difference between the cosworth pistons made in the US and the ones from the UK. is that true? (the UK ones being better )
offtopic;
i heard there is a difference between the cosworth pistons made in the US and the ones from the UK. is that true? (the UK ones being better )
07 January 2011, 03:21 PM
#337
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I've no doubt they are hand rolled on the thighs of the fantasy female of your choice.
Or male..
07 January 2011, 03:48 PM
#338
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Alan how much are they a set ?
When you quoted me for a rebuild and fully forged block which do you use, and how much extra would these be.
they looooook sooooooooooo nice
When you quoted me for a rebuild and fully forged block which do you use, and how much extra would these be.
they looooook sooooooooooo nice
09 January 2011, 03:11 PM
#340
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10 January 2011, 10:16 PM
#341
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My motor is the 2008 eurospec with an added prodrive backbox. Spirited driving, its ticked all the boxes for piston failure (even ran it on standard unleaded for most of the time). I had the reflash early on and it felt like it lost 20 hp. Since had a Bob Rawle custom remap which transformed it. Hope it doesnt go pop, but for sure will be fitting a set of them if it starts to show the slightest of signs.
10 January 2011, 10:33 PM
#342
Yeah, it's funny/sad (delete as app.) how us petrolhead types get all gooey about precision engineered parts... Which, ultimately, you don't get to see in operation! 
It's a "man thing" - all to do with 'gadgetry' on a grand scale.
Girls don't get it LOL!
It's a "man thing" - all to do with 'gadgetry' on a grand scale.Girls don't get it LOL!
Last edited by joz8968; 10 January 2011 at 10:37 PM.
11 February 2011, 09:25 PM
#343
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any 2011s gone yet im on 4500 and still going apart from Brakes grinding like a bast, dealer looking at em Monday, must have been the snow thats done something to em, i feel like theres grit under em all the time.
Disks look ok
Disks look ok
28 February 2011, 02:14 PM
#344
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Hey !
One more gone !
2007 STI sedan PPP, two pistons are dead and turbo has wastegate crack. Mileage is only 45 000km. Going with wiseco pistons, new VF48 turbo and remap, hope it helps because it costs aloooot.
Sander
One more gone !
2007 STI sedan PPP, two pistons are dead and turbo has wastegate crack. Mileage is only 45 000km. Going with wiseco pistons, new VF48 turbo and remap, hope it helps because it costs aloooot.
Sander
15 March 2011, 09:18 AM
#346
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think mines been had by dreaded ring failure !
enginge light & few other warning light came on sat, took to dealer y,day code p0024 came up & oil was off dip stick all points to ring failure
thorth i got one of the few good ones as had 44k on clock , only good thing is its gone b4 warrenty runs out nx month
so waiting to hear from garage with report on it in nx couple of days
enginge light & few other warning light came on sat, took to dealer y,day code p0024 came up & oil was off dip stick all points to ring failure
thorth i got one of the few good ones as had 44k on clock , only good thing is its gone b4 warrenty runs out nx month
so waiting to hear from garage with report on it in nx couple of days
15 March 2011, 09:41 AM
#347
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Sparkey whats Garage said about your
Engine/Drivetrain Modifications: revolution exhaust system
U know what IM are like change a sticker and they wont support you.
Engine/Drivetrain Modifications: revolution exhaust system
U know what IM are like change a sticker and they wont support you.
15 March 2011, 10:11 AM
#349
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im saving for Alan to make mine 450 but need to ride it for a while. Gonna get pistons changed to cossi or something like have engine forged etc.
Just watching fuel prices at the moment, if there isnt a revolt in the next 9 months im gonna think about looking at something else. Not that Fuels an Issue i just hate filling their pockets.
Just watching fuel prices at the moment, if there isnt a revolt in the next 9 months im gonna think about looking at something else. Not that Fuels an Issue i just hate filling their pockets.
15 March 2011, 10:19 AM
#350
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the way iam looking at fuel prices is doesnt matter what car ur driveing we r getting screwed big style !!
doesnt matter what u put in std fuel or v,power , if u r getting shafted u mite as well enjoy it as long as u can afford it
there mite well b forged pistions going in when it gets rebuild , watch this space
doesnt matter what u put in std fuel or v,power , if u r getting shafted u mite as well enjoy it as long as u can afford it
there mite well b forged pistions going in when it gets rebuild , watch this space
15 March 2011, 11:33 AM
#352
Scooby Senior
do engine warning lights come on when you get a problem with the piston?
15 March 2011, 11:42 AM
#354
Scooby Senior
^^^^
I've one year warranty left (Jan 2012) then + 2 yrs extended with Subaru as well taking it till 2014.
Only got 16400 miles on the clock....
keeping fingers crossed I'm ok.. hence why not doing anything to the car.. just in case!
I've one year warranty left (Jan 2012) then + 2 yrs extended with Subaru as well taking it till 2014.
Only got 16400 miles on the clock....
keeping fingers crossed I'm ok.. hence why not doing anything to the car.. just in case!
Last edited by salsa-king; 15 March 2011 at 11:44 AM.
15 March 2011, 01:08 PM
#355
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Just keep filling up with Tesco 99. Dont think you will have any problems then. Just a guess, but i think there are lots of garages out there putting ordinary unleaded through their super unleaded pumps and pocketing the 8p a litre. Cant see a major supermarket doing it.
15 March 2011, 01:21 PM
#356
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Just keep filling up with Tesco 99. Dont think you will have any problems then. Just a guess, but i think there are lots of garages out there putting ordinary unleaded through their super unleaded pumps and pocketing the 8p a litre. Cant see a major supermarket doing it.
this scares me a bit cos how can we tell, surely if your found to have 95 in on engine failure how do u prove it.
I know a guy on here Rob i think, had this.
Easist way use 95 and addative But i know ballache :P
15 March 2011, 02:55 PM
#357
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since having the car its had
2x £40 SHELL SUL
3x £40 TESCO SUL
ranging between 132p-134p a litre.
2x £40 SHELL SUL
3x £40 TESCO SUL
ranging between 132p-134p a litre.
15 March 2011, 03:56 PM
#358
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i think its to late when lights come on damage already done ! uv just got to keep checking oil etc & if not boosting or hesitating r ment to be warning signs
mines been ran on v,power since i got & not hammered just daliy drive & a bit play now & then
mines been ran on v,power since i got & not hammered just daliy drive & a bit play now & then
17 March 2011, 10:14 PM
#359
Cosworth forged pistons won't solve the issue even the STI cosworth press car went pop and thats full of cosworth bits 
The 2.5l engine has an inherant issues which is one of the reasons why Litcho has stopped with the type 25.
The 2.5l engine has an inherant issues which is one of the reasons why Litcho has stopped with the type 25.
17 March 2011, 11:03 PM
#360
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