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The poor 2.5 Hatch Engine

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Old 18 October 2012, 07:16 PM
  #61  
mrmadcap
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I think the fact that it stipulates 98 ron on the fuel flap is to maintain performance advantages, not to prevent the engine going pop.

There are more serious reasons for the failures and I don't think it's down to using lower octane fuel.

Remember, you are all discussing a Subaru motor vehicle not the Millennium Falcon or Flash Gordon’s Rocket.

If the cars couldn't be run on normal fuel they wouldn't be able to sell the cars in the UK, because the 98 ron stuff isn't available in more places across the UK than you think.
Old 18 October 2012, 07:20 PM
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Originally Posted by mrmadcap
I think the fact that it stipulates 98 ron on the fuel flap is to maintain performance advantages, not to prevent the engine going pop.

There are more serious reasons for the failures and I don't think it's down to using lower octane fuel.

Remember, you are all discussing a Subaru motor vehicle not the Millennium Falcon or Flash Gordon’s Rocket.

If the cars couldn't be run on normal fuel they wouldn't be able to sell the cars in the UK, because the 98 ron stuff isn't available in more places across the UK than you think.
what does that word after 98 ron gasoline say??

Old 18 October 2012, 07:21 PM
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Same as most bmw's etc all stipulate super also
Old 18 October 2012, 07:31 PM
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Low octane fuel may accelerate the demise of the EJ257, but it is not the only cause. They also fail in the hands of those who continuously monitor knock, AFR, use the best fuel, warm up based on oil temperatures, cool down and maintain properly.
Old 18 October 2012, 07:36 PM
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Very true. But using the correct grade fuel will limit det and early failure that's for sure.
Old 18 October 2012, 07:39 PM
  #66  
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i think the point is that the 2.5 is a weak engine, this is well documented on here and in other places.

numerous hg issues and ring land failures.

using fuel below the ron rating recommended is only going add to the problem
Old 18 October 2012, 07:47 PM
  #67  
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Originally Posted by tubbytommy
what does that word after 98 ron gasoline say??

What i'm getting at is, they say 98 ron only in order that the claimed performance figures can be chased in real world conditions.

We all realise that manufacturers figures are fantasy, but they would be more so if lower octane fuel was used.
Old 18 October 2012, 07:48 PM
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Originally Posted by mrmadcap
What i'm getting at is, they say 98 ron only in order that the claimed performance figures can be chased in real world conditions.

We all realise that manufacturers figures are fantasy, but they would be more so if lower octane fuel was used.
the engines det on lower octane fuel.
Old 18 October 2012, 07:50 PM
  #69  
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Originally Posted by chrispy200+
Same as most bmw's etc all stipulate super also
Most people who own BM's do so out of badge snobbery, nothing to do with the desire to drive or own a performance car.

I've yet to see a BM owner at the petrol station fill up with anything other than 95 ron.
Old 18 October 2012, 07:52 PM
  #70  
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Originally Posted by tubbytommy
the engines det on lower octane fuel.
Where's Lewis, i need him to back me up
Old 19 October 2012, 09:03 AM
  #71  
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Originally Posted by scooby1929
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
The cars must be capable of running on other fuels.

These cars are not UK car specifically, they are Euro cars and many parts of Europe cannot get anything > 95ron
Old 19 October 2012, 09:29 AM
  #72  
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From the Official Workshop manual for the latest WRX/WRX STi 's




Fuel flap label after the 320R/340R remap...

Old 19 October 2012, 10:13 AM
  #73  
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Further to above post for those that don't read the Owners Manual

Old 19 October 2012, 01:36 PM
  #74  
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Originally Posted by Don Clark
From the Official Workshop manual for the latest WRX/WRX STi 's




Fuel flap label after the 320R/340R remap...

Originally Posted by Don Clark
Further to above post for those that don't read the Owners Manual

and the guru has spoken
Old 19 October 2012, 03:20 PM
  #75  
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Originally Posted by stevie1982
and the guru has spoken
Old 19 October 2012, 04:29 PM
  #76  
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i wouldn't use low octane fuel in the same way i wouldn't use cheap oils/fluids........

alyn
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