Docmartin4x4 Posted December 19, 2015 Share Posted December 19, 2015 Have purchased a 03 wagon WRX PPP with big ends rattling !! So though about fitting a short engine but 2.5l as opposed to the standard 2.0l. Will all parts just bolt on on will there be other changes required. I take it a remap will e required after as well. Mart Quote Link to comment Share on other sites More sharing options...
martyc Posted December 20, 2015 Share Posted December 20, 2015 I'd be inclined to stick with the 2.0 unless there's a good reason to go to the 2.5 (professionally built lump) as the Pistons have been known to fail and it's not as reliable as the 2.0 Sent from my iphone using Tapatalk Quote Link to comment Share on other sites More sharing options...
kershaw-330s Posted December 20, 2015 Share Posted December 20, 2015 But as an answer to your question it could be a bigger job than you think it depends which 2.5 block you get but the case ings are the same it's the heads and the avcs systems that could be a pain . But a well sorted built ej257 is a peach it's just a shame about their standard form Sent from my iphone using Tapatalk Quote Link to comment Share on other sites More sharing options...
quit Posted December 20, 2015 Share Posted December 20, 2015 Why ? The 2.5 is garbage Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted December 20, 2015 Share Posted December 20, 2015 You can fit 2ltr heads to a 2.5ltr bottom end as there's quite a few 2.5 classics running 2ltr heads to retain their original inlets/loom . I think the 2ltr heads would probably need a bit of machine work due to the 2.5 ltr having bigger dia pistons (but I'm not 100% sure) You'd also need someone who knows the piston bowl and head chamber sizes to calculate the correct head gasket thickness needed to achieve the 8.5.1 ideal compression ratio . As said above in standard guise the 2.5 is the weaker engine but when "pinned" and forged they do make nice figures [emoji6] 1 Quote Link to comment Share on other sites More sharing options...
Docmartin4x4 Posted December 20, 2015 Author Share Posted December 20, 2015 Well thanks for the replies, the consensus is obviously to stay with 2.0l, so that is what i will do gentlemen. Rebuild or get a 2nd hand unit that is the next question? Mart Quote Link to comment Share on other sites More sharing options...
kershaw-330s Posted December 20, 2015 Share Posted December 20, 2015 That now all depends on budget and how much power etc your after Sent from my iphone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Docmartin4x4 Posted December 20, 2015 Author Share Posted December 20, 2015 Good point! Budget is not excessive unfortunately and I would like 340-350 hp at the end of the day, if possible. At the moment she is running 265ps as it has PPP, prodrive quote a figure of 4.8 0-60, so I would to get back to that as a starter and then have the ability to build on it if I wanted to. Mart Quote Link to comment Share on other sites More sharing options...
Scoobyghost Posted December 20, 2015 Share Posted December 20, 2015 Always a risk going for a second hand lump. If it's been sat in a yard for some time it would need belts/servicing. Quote Link to comment Share on other sites More sharing options...
Tidgy Posted December 21, 2015 Share Posted December 21, 2015 Time to dispell some myths ;) First off the standard 2.5 is pretty poor, ringlands and headgaskets are known to fail. However built right, there fine to 450bhp and keep the right side of reliability. For road use a built right a 2.5 is about as good as it gets in scoob, the low down grunt they produce makes them spool allot better than 2.0's. Anything above 450 then block needs work, pinning is an option but personally i'd go for close deck converting given its only about £500 give or take. In fact i just have. Just finished running in my closed deck 2.5 converted Type R. I had a forged 2.5 in my old hawk and yet to see anyone get near this on a 2.0. I've had 2.0's and i've had 2.5's and i'd go 2.5 all day long 1 Quote Link to comment Share on other sites More sharing options...
quit Posted December 21, 2015 Share Posted December 21, 2015 389 on a 2.0 ? Seen plenty pushing that, tho most start going 2.1 stroker route My mates Sti was about 370 on standard engine !!! Quote Link to comment Share on other sites More sharing options...
Tidgy Posted December 22, 2015 Share Posted December 22, 2015 thats a 2.5 mate, no chance of getting a torque figure or spool like that on a 2.0 ;) Was limited by the top mount, had an sti one on it and was getting temp issues. Quote Link to comment Share on other sites More sharing options...
quit Posted December 22, 2015 Share Posted December 22, 2015 Seen some good figures with the standard Sti top mount tho ! Quote Link to comment Share on other sites More sharing options...
Tidgy Posted December 22, 2015 Share Posted December 22, 2015 like all tuning varies from car to car, was pushed to just over 400 and then backed off due to temps. i wouldn;t wanna run more than that on a top mount thats for sure Quote Link to comment Share on other sites More sharing options...
quit Posted December 22, 2015 Share Posted December 22, 2015 Yeah ! I keep thinking about going for a front mount but I don't see any point st the moment Quote Link to comment Share on other sites More sharing options...
Tidgy Posted December 23, 2015 Share Posted December 23, 2015 Yeah ! I keep thinking about going for a front mount but I don't see any point st the moment what power you running? Anything bigger than a TD04 will see an improvement when a front mount is fitted and mapped. thing is people get hung up on claims it causes lag. unless you get one with a stupidly large core then they don't. once you swap out the standard turbo you see improvements in power from a front mount, cooler temps allow more aggressive timing with the map, issue is always heat so improving the air cooling leaves more wiggle room for the mapper. Quote Link to comment Share on other sites More sharing options...
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